Table of content. Exhaust equipment. Shock mountings. Cable mountings. Sandwich mountings

Transcription

1 Table of content Exhaust equipment 1.1 Shock elements for exhaust systems Page Shock absorbing stabilizers RD1 Page Shock absorbing stabilizers RD2 Page Shock mounting type RDS-B Page 5 Shock mountings 2.1 Shock mounting type RDS-R8 Page Shock mounting type RDS-R4 Page Shock mounting type RDS-C Page Shock mounting type RDS-X Page Shock mounting type RDS-XM Page Shock mounting type RDS-Y Page Shock mounting type RDS-J Page Maintenance of the RDS-mountings Page 18 s 3.1 s, type A1 Page s, type A2 Page s, type A3 Page s, type A4 Page s, type A5 Page s, type A6 Page s, type A8 Page s, type A1 Page s, type A13 Page s, type A16 Page s, type A22 Page 29 Sandwich mountings 4.1 Sandwich mountings general information Page Technical data and fitting instruction Page Type VRD 34 L1 Page Type VRD 35 S1 Page Type VRD 35 M1 Page Type VRD 35 L1 Page Necessary information for engineering Page Maintenance Page 37 1

2 1.1 Shock elements for exhaust systems Rubber Design is one of the leading companies in the field of shock and vibration control on board naval vessels. As a provider of shock and vibration solutions, Rubber Design is continuously exploring innovative shock calculation methods, as well as developing new type of shock mountings by using finite elements computer programs. Rubber Design sets the pace for answering international military demands by designing a new generation of shock mounts, with a minimum of shock transmission and a maximum of vibration isolation. In every situation where diesel engines are used, noise and vibrations will be generated! As well through the engine foundation, engine disturbance will travel along the exhaust system to be transmitted into the vessel wherever the system is in contact with the ships structure. Rubber Design BV has the experience and solutions to control these vibration and noise emissions from the exhaust system. By flexibly mounting not only the engine but also the exhaust system, we can control most of these unwanted noise emissions. A significant reduction in the radiated noise and vibration can be achieved by introducing rubber-metal elements between the exhaust system and ship s structure. For an explanation of how the noise reduction is achieved, the transmission speed of sound through steel and rubber needs to be understood. The transmission speed through steel is approximately 5 m/sec. while through rubber, the transmission speed is approximately 45 to 9 m/sec. By careful design and positioning of the rubber-metal elements it is possible to obtain a reduction of 8 to 1 db (A) across the majority of the frequency range of 63 to 4 Hz. To give the optimum isolation, the number of mountings are kept to a minimum and positioned at strengthened locations in the ship s structure, for example deck levels, frame webs or specially constructed supports. Every installation takes into account the weight of the appropriate section of the system, the forces produced by ship movements and thermal expansion effects. It is equally important to ensure the frequencies, produced by any part of the exhaust system, are not the same as the frequencies caused by the engine ignition, the first order frequencies of the engine or the propeller blade frequency. Types of mounting. Two basic types of mounting are used, fixed support mountings and stabiliser mountings. The fixed support mountings absorb the static and dynamic forces and determine the direction of the expansion in the exhaust system. The stabiliser mountings allow the thermal expansion movement caused by the high temperature of the exhaust piping within the ship s structure to be controlled. In case of horizontal piping the stabiliser mountings also carry the weight of the pipe. Thermal insulation. In order to protect the rubber against the high exhaust gas temperatures, it is necessary to install sufficient thermal insulation. It is essential to reduce the temperatures at the rubber-metal elements to less than 8 C. By using suitable insulation materials, it is possible to keep the temperature to a maximum of 5 C. It is always recommended to provide a minimum air gap of approximately 25 mm between the exhaust mounting and exhaust system. The above is applicable for the flexible fixed points, for the stabilisers the thermal insulation is attained to the length of the threaded rod. E.S. - 2 Last revision

3 1.2 Shock absorbing stabilizers RD1 These stabilizers are built with components of our proven standard stabilizers, but with extra rubber discs added. The extra discs extend the maximum deflection, so the stabilizer can absorp a larger shock. Adding discs results in decreasing stiffness, combined with increased deflection. At the moment, there are eight types available. When choosing one of them, it is recommend to let us give advice for the suspension of your exhaust gas system. When the exhaust system requires a special kind of stabilizer, Rubber Design is able to develop them. That also counts for special pipeplates, materials or any other properties. 3 Static load deflection characteristic 5 Static load deflection characteristic RD 14/45 RD 15/45 RD 16/45 RD 17/ RD 14/6 RD 15/6 RD 16/6 RD 17/ in mm in mm Type Qty A B C D E F G H I Max static load Weight discs 45º/6º RD14 2 x M kn / 6.3 kn 11.2 kg RD15 2 x M kn / 4.9 kn 11.7 kg RD16 2 x M kn / 4.1 kn 12.2 kg RD17 2 x M kn / 3.4 kn 12.7 kg E.S. - 3 Last revision

4 1.3 Shock absorbing stabilizers RD2 These stabilizers are built with components of our proven standard stabilizers, but with extra rubber discs added. The extra discs extend the maximum deflection, so the stabilizer can absorp a larger shock. Adding discs results in decreasing stiffness, combined with increased deflection. At the moment, there are eight types available. When choosing one of them, it is recommended to let us give advice for the suspension of your exhaust gas system. When the exhaust system requires a special kind of stabilizer, Rubber Design is able to develop them. That also counts for special pipeplates, materials or any other properties. 5 Static load deflection characteristic 12 Static load deflection characteristic RD 24/45 RD 25/45 RD 26/45 RD 27/ RD 24/65 RD 25/65 RD 26/65 RD 27/ in mm in mm Type Qty A B C D E F G H I J Max static load Weight discs 45º/6º RD24 2 x M3 5.8 kn / 15.6 kn 17.2 kg RD25 2 x M3 4.5 kn / 12.1 kn 18. kg RD26 2 x M3 3.6 kn / 1.7 kn 18.9 kg RD27 2 x M3 3.1 kn / 9. kn 19.7 kg E.S. - 4 Last revision

5 1.4 Shock mounting type RDS B This mounting is used as a semi-rigid mounting, capable for shock absorption in exhaust gas systems. The mounting, like the flexible stabilizers mentioned before, is based upon proven technology from our flexible exhaust suspension equipment. Isolation plates protect the rubber inside the mounting from high temperature exposure. Placed in between normal vibration isolators and large displacement shock mountings, this mounting is capable of providing adequate shock protection to non-sensitive equipment, and providing good vibration isolation under harsh conditions. Static load deflection characteristic RDS-B/45 RDS-B/5 RDS-B/55 RDS-B/ in mm E.S. - 5 Last revision

6 2.1 Shock mounting type RDS-R8 Rubber Design developed this shock mounting mainly for marine applications. This type of mounting can stand a linear shock deflection up to 8 mm. The RDS mounting is meeting the requirements of all international shock specifications such as BV 43, BV 44, MIL 91, STANAG and MOD. The shock mounting type RDS is in particular suitable for marine applications such as propulsion engines, diesel generator sets and auxiliary equipment where attenuation of low frequencies is required. The RDS shock mounting is capable to reduce an input shock of 21 G to a transmitted shock of 6 G in a time to maximum velocity of 5 ms. The RDS shock mounting is suitable for a nominal load of 23 kn and a maximum load of 34 kn. resulting in a natural frequency of 4 Hz under maximum load. The RDS shock mounting developed by Rubber Design with a shock deflection of 8 mm gives that extra shock insulation which makes the difference. Where others with the same unloaded mounting height are restricted to 6 mm shock deflection, Rubber Design operates at 8 mm. Sh.M. - 6

7 Technical data Static load deflection characteristic vertical deflection Static load deflection characteristic lateral deflection RDS RDS in mm in mm Static load deflection characteristic longitudinal deflection 4, Transfer function RDS-mount 2 3, RDS 6 Lt db ref. 1kg (1/3 octave band) 2, 1,, -1, RDS 6 4-2, -3, in mm -4, 31, Frequency (Hz) Sh.M. - 7

8 2.2 Shock mounting type RDS-R4 Based on the principals of our RDS-R8 shock mounting, the RDS- R4 adds to the range of high quality shock absorption solutions for marine applications. The nominal load range of the RDS-R4 is placed below the RDS-R8, complementing the range of high quality anti vibration and shock products for a larger equipment range. Working principals are likewise, providing very low transmitted shock under shock loads due to the linear shock load deflection curve. The RDS-R4 works with a linear shock deflection up to 4 mm. The combination of high shock deflection capabilities and good sound & vibration isolation features, make this mounting the ideal solution for small medium speed diesel engines of generator sets, large pump sets and other rotary equipment. Like all other RDS shock mountings, the RDS-R4 meets the requirements of all international shock specifications like, for example, BV43, BV44, MIL-STD-91, STANAG, MOD BR321, etc. Static load deflection characteristic RD SMD/45 RD SMD/5 RD SMD/55 RD SMD/ in mm Sh.M. - 8

9 2.3 Shock mounting type RDS-C General / Applications In addition to the existing RDS shock mounting range, the new RDS C-165/95, RDS C-165/126 and RDS C-25/154 provide the ideal solution for equipment protection (up to 15 kg per mounting) like water makers, pump sets, gensets and hydropacks, whilst also isolating the vibrations of the resiliently mounted equipment. Features The unique mounting design characteristics allows absorption of large shock displacements whilst ensuring excellent vibration isolation. The RDS C-mountings have a linear stiffness over a wide range varying from compression to extension, which is necessary to maintain the optimum isolation properties. The maximum deflection of the mounting as a result of shock impact is as large as up to 5 mm in all directions. Due to the conical round shape, the RDS-C mountings have identical stiffness characteristics in longitudinal and transverse direction. A special developed natural rubber compound for high dynamic loads is used which ensures the best results for long lifetime of the shock mountings. The chosen metals provide a solid vulcanisation base, ensuring high quality within the RDS series. Quality control The mountings are individually tested, marked with date of production and identification number before delivery to the customers. The new RDS mountings fulfil the requirements of international shock specifications, such as BV 43, BV 44, MIL 91, STANAG, MOD etc. Dimensions The 165/95 S and H have identical dimensions, but different stiffness s and characteristics. Likewise, the 165/126 S and H mountings share identical dimensions, but vary in stiffness and characteristics. The 25/154S is only available in S -execution. Static load deflection characteristic RDS S Compression º Sh.A 55º Sh.A in mm Static load deflection characteristic RDS H Compression º Sh.A 45º Sh.A 55º Sh.A in mm Sh.M. - 9

10 Technical data Static load deflection characteristic RDS S Compression º Sh.A in mm Static load deflection characteristic RDS H Compression º Sh.A 45º Sh.A 55º Sh.A 65º Sh.A in mm Sh.M. - 1

11 Static load deflection characteristic RDS S Compression Type S 45º Type S 55º Type S 65º in mm Sh.M. - 11

12 2.4 Shock mounting type RDS-X The type X leaf spring mounting was first introduced into the Naval Service some years ago by the MOD to isolate equipment from under water shock and to prevent vibration from equipment transferring to a ship s structure and thus water. The present range of this type of mounting is between 1 kg to 45 kg. However, the reduction in the size and mass of ancillary equipment resulted in the addition of mass to accommodate the smallest mounting. There was therefore a requirement for a mounting of similar type but which will support smaller masses. This range of mountings was designed specifically for shipboard applications and is particularly suitable to protect marine equipment from shock due to underwater explosions. When loaded within their recommended range, RDS-X Mountings are capable of attenuating large shock inputs. They are also an effective antivibration mounting, having a low natural frequency. The RDS-X Mounting is made from stainless steel strip to BS 1449/32 S 25 hard cold rolled. The leaves are U shaped and riveted or bolted together at the open ends with face plates and spacer platers to form an elliptical shaped assembly. The space between the inner and outer leaves is filled with an epoxy resin damping compound, and the whole Mounting is coated with neoprene paint. High-impact nylon bushes and washers, with stainless steel backing washers, are provided for improved noise attenuation and load bearing. There are eight sizes for nominal loads ranging from 1 to 45 kg. Non Magnetic RDS-X Mountings. RDS-X Mountings can be manufactured for non-magnetic applications. Typical applications are for example: heavy machine tools, air compressors, engine suspensions, machine mountings, laboratory equipment, electric motors, radar communications equipment, electronic control equipment, refrigeration compressors, fuel tanks, blowers and fans, pumps etc. Note: Special care must be taken to ensure that the required clearances are provided around the equipment and the RDS-X Mountings. Precautions must also be taken to ensure that cables, pipes and other connecting services do not interfere with the functioning of the mounting, and that these connections will not themselves be damaged by motion of the equipment under shock. 2 inch 4 Static load deflection characteristic Tension 4 Static load deflection characteristic Compression Force in N kg 2 kg 45 kg 7 kg 11 kg kg 2 kg 45 kg 7 kg 11 kg in mm in mm Type Nato Stock Number (NSN) Rating Supported mass range A B C D Sh.M E F Bolt Weight M M M M M12 1.3

13 4 inch Type Nato Stock Number (NSN) Rating Supported mass range A B C D E F Bolt Weight M M M2 7.3 Static load tension characteristic Static load compression characteristic kg 32 kg 45 kg kg 32 kg 45 kg in mm in mm Sh.M. - 13

14 Technical details Type Nominal load Transmitted Acceleration V = Vertical m/s H s = Horizontal Across m/s H r = Vertical Across m/s Natural frequency and shock natural frequency (Acceleration&Deceleration) V = Vertical Hz H a = Horizontal Across Hz H r = Vertical Across Hz Max. shock deflection V = Vertical mm H a = Horizontal Across mm H r = Vertical Across mm Static stiffness V = Vertical kn/m H a = Horizontal Across kn/m H r = Vertical Across kn/m Dynamic stiffness H r = Vertical Across kn/m H s = Horizontal Across kn/m H r = Vertical Across kn/m Dynamic factors H r = Vertical Across H s = Horizontal Across H r = Vertical Across Stiffness ratio н R a = Horizontal Across R r = Horizontal Roll Support stiffness kn/m Support strength N Sh.M. - 14

15 2.5 Shock mounting type RDS-XM The RDS-XM mounting is an all-metal version of the RDS-X mounting, which will maintain its properties over a wider temperature range than the RDS-X mounting. RDS-XM mountings are essentially similar to the RDS-X mountings, utilising the same leaf spring assembly, except that the epoxy resin damping compound has been replaced by stainless steel mesh inserts. Whereas the inclusion of the epoxy resin damping compound rendered the RDS-X mounting temperature sensitive (with optimum isolation efficiency at +15 to +2 C) the mesh inserts will operate over a range of 15 to +4 C with little change to the damping properties. In addition the RDS-XM has a reduction in natural frequency of the system. The RDS-X and RDS-XM are the most space efficient of all shock mountings, having originally been developed for submarines. The elliptical leaf spring assembly enables the RDS-X and RDS-XM to have at least +/- 6mm of displacement under vertical shock conditions, within their low overall height. In addition, they have +/- 4mm of displacement to provide friction damping. Some mountings, other than leaf springs, are often employed at 45 to the vertical in an effort to equalise the stiffness in all directions. This increases the overall space envelope. The RDS-X mounting is part of the British Admirality range of standardised mountings all NATO codified and made to Naval Engineering Standards. The RDS-XM utilises the same leaf springs and is intended to be directly interchangeable with the RDS-X mounting for extreme environmental conditions. The table below gives dimensional details of the range of RDS-XM mountings. Type Nato Stock Number (NSN) Rating Supported mass range A B C D E F Bolt Weight Not allocated M8.7 Not allocated M8.8 Not allocated M12 1. Not allocated M Not allocated M Not allocated M2 5.9 Not allocated M2 6.6 Not allocated M2 7.3 Sh.M. - 15

16 2.6 Shock mountings type RDS-Y The mounting is a modified version of the type RDS-X mounting, developed by the Ministry of Defense to provide improved noise attenuation at higher frequencies. The essential improvement in noise attenuation is provided by precisely compounded rubber mouldings, forming the accelerator and decelerator units. These mouldings act as a high frequency isolator providing increased stealth performance over the RDS-Xmounting. The RDS-Y mounting as a development of the RDS-X mounting gives similar shock but better vibration protection, compared with other mountings approved by the MOD for Naval use. Applications are similar to the RDS-X mounting with the same restricions on use applying to use in the ship s masthead region or after 1/8 th of the ship s length. Special care must be taken to ensure that the required clearances are provided around the equipment. This is necessary to reduce the risk of damage to motion of the mountings during shock. RDS-Y mountings have been used to reduce the vibration and noise transmitted through the ship s hull by such equipment as refrigeration compressors, air compressors, pumps, blowers and fans, engines etc. The table below gives dimensional details of the range of RDS-Y mountings, which are based on the RDS-X mountings. There are eight load sizes with nominal loads ranging from 1 to 45 kg. These sizes fall into three groups dimensionally i.e. 1 2; ; Groups one and two are 51 mm wide with group three 12 mm wide. The RDS-Y mounting can be delivered with two types fixing kits, consisting of bolts, washers and a distance piece. Type Nato Stock Number (NSN) Rating Supported mass range A B C D Top Bolt Bottom Bolt M6 M M6 M M1 M M1 M M1 M M16 M M16 M M16 M2 Sh.M. - 16

17 2.7 Shock mountings type RDS-J Suitable for shock mounting applications, where alignment with either equipment or ships structure need not be maintained after shock, and where vibration protection or isolation is not a requirement. The mounted item may be displaced from its original position by plastic yielding of the mounts as a result of shock. But it may be possible to regain shock protection, as an emergency measure, by forcing the mounts back into their original shape. The J Mount is commonly employed for the shock protection of robust electrical distribution equipment, including switch and control gear. The J Mount is a curved metal strap designed to yield at a predetermined load in any direction under shock. The mount is self-contained, needing no separate or additional associated devices (i.e. Decelerators). It is cost effective and requires little maintenance because its zinc plated surface protects it against corrosion. The J mount is an effective shock mount, with only minor shortcomings in deflection capabilities. J Mount A and J Deck Mounting J Bulkhead Mounting J mounts A Range (metric) NATO Stock Number Mount Size No. Mass Range A B C D E F A M A M A M A M A M A M A M A M A M J Bulkhead mounts (metric) NATO Stock Number Mount Size No. Mass Range A B C D E F G M M M M M M J Deck mounts (Original Range - metric) NATO Stock Number Mount Size No. Mass Range A B C D E F M M M M M M H Sh.M. - 17

18 2.8 Maintenance of the RDS-Mountings The life expectancy of the rubber elements will be approximately 2 years in ideal circumstances. Unfortunately ideal circumstances are not feasible, therefore the (working) life expectancy will be approx. 1 years. The life expectancy of the rubber elements is dependent on the environmental circumstances (weather influences, contaminants, etc). A visual inspection of the RDS-Mountings should be carried out six months after installation and should be repeated every year. For better recognition of damages you can use a blunt pin. The use of a screwdriver is not advisable, because of the damage it can cause to the conical mountings. The use of a natural rubber (NR) compound for the rubber elements means that they are not oil resistant. The occasional occurrence of oil-leaks does not effect the working of the conical mountings, because the oil will only damage the surface of the rubber elements. In case of oil contamination the rubber elements will show some signs of swelling. Storage, cleaning and maintenance of the rubber elements should be done in accordance with DIN The cleaning of the RDS-Mountings should be done with a normal (household) cleansing agent. It is also advisable to use a glycerine-alcohol mixture (1:1). Do not use a solvent cleansing agent. In cases where it is necessary to replace the RDS-Mounting, we advise return of the RDS-Mounting to Rubber Design BV. If required, the RDS-mounting can be painted by the customer, Be aware that only the top- and base plate of the RDS-Mounting can be painted. Do not use paint on the rubber element as the rubber element might be contaminated and therefore be damaged. All deliveries are stored for over 2 years in a database including all relevant data and characteristics. When cleaning the engine or the engine room with a solvent cleansing agent, it is advisable to cover up the RDS-Mountings. If the cleansing agent still contaminates the rubber elements, they should be cleaned als follows. Sh.M. - 18

19 RD CABLE MOUNTINGS Combined all-metal multidirectional anti-vibration and antishock mountings. No aging Corrosion resistant Highly inherent damping Very low amplification at resonance Severe shock attenuation Wide temperature range (-18 C to +3) Maintenance free 1.1 SERIES A1 Typical applications: Resilient Suspensions meeting Military Standards Isolation of Sensitive Electronic Equipment Isolation of Generators, Pumps and Compressors Exhaust System suspension Isolation of Cabinets, Containers etc. Protection of Equipment during Transport Extreme Temperature Application Standard materials (other qualities on request) Wire rope and threaded inserts: Steel AISI 316 Bars: Aluminium 66-T6 Finish: Chromated Load mode: Compression Typical load range: kg at 1 Hz load A A A (12 Hz) A (14 Hz) A (15 Hz) Load mode: 45 Compression/roll Typical load range: kg at 1 Hz load A A A A (12 Hz) A (13 Hz) Fixture holes Lower bar Upper bar 4.8 mm 4.8 mm Inserts M4 II IY IM IY YY YM Inserts M4 IM YM MM Each cable mount has six alternative configurations with regard to fixture holes (ref. table to the left). When ordering, make your choice and add the hole configuration code to the type number. Example: A YY Load mode: Shear and roll Typical load range: kg at 12 Hz load A A A A A The number of wire loops can be less than 1, f. inst. 4, 6 or 8, whereat the load range is correspondingly reduced. Height (H) Width (W) Mass A A A A A C.M. - 19

20 RD CABLE MOUNTINGS Combined all-metal multidirectional anti-vibration and antishock mountings. No aging Corrosion resistant Highly inherent damping Very low amplification at resonance Severe shock attenuation Wide temperature range (-18 C to +3) Maintenance free 1.2 SERIES A2 Typical applications: Resilient Suspensions meeting Military Standards Isolation of Sensitive Electronic Equipment Isolation of Generators, Pumps and Compressors Exhaust System suspension Isolation of Cabinets, Containers etc. Protection of Equipment during Transport Extreme Temperature Application Standard materials (other qualities on request) Wire rope and threaded inserts: Steel AISI 316 Bars: Aluminium 66-T6 Finish: Chromated Load mode: Compression Typical load range: 4 12 kg at 1 Hz load A A A (14 Hz) A (14 Hz) A (15 Hz) Load mode: 45 Compression/roll Typical load range: 3 1 kg at 1 Hz load A A A A (11 Hz) A (12 Hz) Fixture holes Lower bar Upper bar 5.5 mm 5.5 mm Inserts M5 II IY IM IY YY YM Inserts M5 IM YM MM Each cable mount has six alternative configurations with regard to fixture holes (ref. table to the left). When ordering, make your choice and add the code to the type number. Example: A YY Load mode: Shear and roll Typical load range:.6 4 kg at 12 Hz load A A A A A The number of wire loops can be less than 1, f. inst. 4, 6 or 8, whereat the load range is correspondingly reduced. Height (H) Width (W) Mass A A A A A C.M. - 2

21 RD CABLE MOUNTINGS Combined all-metal multidirectional anti-vibration and antishock mountings. No aging Corrosion resistant Highly inherent damping Very low amplification at resonance Severe shock attenuation Wide temperature range (-18 C to +3) Maintenance free 1.3 SERIES A3 Typical applications: Resilient Suspensions meeting Military Standards Isolation of Sensitive Electronic Equipment Isolation of Generators, Pumps and Compressors Exhaust System suspension Isolation of Cabinets, Containers etc. Protection of Equipment during Transport Extreme Temperature Application Standard materials (other qualities on request) Wire rope and threaded inserts: Steel AISI 316 Bars: Aluminium 66-T6 Finish: Chromated Load mode: Compression Typical load range: 1 25 kg at 1 Hz load A A A A (12 Hz) 2 14 A (14 Hz) Load mode: 45 Compression/roll Typical load range: 6 15 kg at 1 Hz load A A A A A (12 Hz) Fixture holes Lower bar Upper bar 6.5 mm 6.5 mm Inserts M6 II IY IM IY YY YM Inserts M6 IM YM MM Each cable mount has six alternative configurations with regard to fixture holes (ref. table to the left). When ordering, make your choice and add the code to the type number. Example: A YY Load mode: Shear and roll Typical load range: kg at 12 Hz load A A A A A The number of wire loops can be less than 1, f. inst. 4, 6 or 8, whereat the load range is correspondingly reduced. Height (H) Width (W) Mass A A A A A C.M. - 21

22 RD CABLE MOUNTINGS Combined all-metal multidirectional anti-vibration and antishock mountings. No aging Corrosion resistant Highly inherent damping Very low amplification at resonance Severe shock attenuation Wide temperature range (-18 C to +3) Maintenance free 1.4 SERIES A4 Typical applications: Resilient Suspensions meeting Military Standards Isolation of Sensitive Electronic Equipment Isolation of Generators, Pumps and Compressors Exhaust System suspension Isolation of Cabinets, Containers etc. Protection of Equipment during Transport Extreme Temperature Application Standard materials (other qualities on request) Wire rope and threaded inserts: Steel AISI 316 Bars: Aluminium 66-T6 Finish: Chromated Load mode: Compression Typical load range: 18 4 kg at 1 Hz load A A A A (11 Hz) A (12 Hz) Load mode: 45 Compression/roll Typical load range: 1 3 kg at 1 Hz load A A A A A Fixture holes Lower bar Upper bar 6.5 mm 6.5 mm Inserts M6 II IY IM IY YY YM Inserts M6 IM YM MM Each cable mount has six alternative configurations with regard to fixture holes (ref. table to the left). When ordering, make your choice and add the code to the type number. Example: A YY Load mode: Shear and roll Typical load range: kg at 12 Hz load A A A A A The number of wire loops can be less than 1, f. inst. 4, 6 or 8, whereat the load range is correspondingly reduced. Height (H) Width (W) Mass A A A A A C.M. - 22

23 RD CABLE MOUNTINGS Combined all-metal multidirectional anti-vibration and antishock mountings. No aging Corrosion resistant Highly inherent damping Very low amplification at resonance Severe shock attenuation Wide temperature range (-18 C to +3) Maintenance free 1.5 SERIES A5 Typical applications: Resilient Suspensions meeting Military Standards Isolation of Sensitive Electronic Equipment Isolation of Generators, Pumps and Compressors Exhaust System suspension Isolation of Cabinets, Containers etc. Protection of Equipment during Transport Extreme Temperature Application Standard materials (other qualities on request) Wire rope and threaded inserts: Steel AISI 316 Bars: Aluminium 66-T6 Finish: Chromated Load mode: Compression Typical load range: 15 8 kg at 1 Hz load A A A A (11 Hz) 7 16 A (13 Hz) Load mode: 45 Compression/roll Typical load range: 1 55 kg at 1 Hz load A A A A A (11 Hz) Fixture holes Lower bar Upper bar 6.5 mm 6.5 mm Inserts M6 II IY IM IY YY YM Inserts M6 IM YM MM Each cable mount has six alternative configurations with regard to fixture holes (ref. table to the left). When ordering, make your choice and add the code to the type number. Example: A YY Load mode: Shear and roll Typical load range: 2 15 kg at 12 Hz load A A A A A The number of wire loops can be less than 1, f. inst. 4, 6 or 8, whereat the load range is correspondingly reduced. Height (H) Width (W) Mass A A A A A C.M - 23

24 RD CABLE MOUNTINGS Combined all-metal multidirectional anti-vibration and antishock mountings. No aging Corrosion resistant Highly inherent damping Very low amplification at resonance Severe shock attenuation Wide temperature range (-18 C to +3) Maintenance free 1.6 SERIES A6 Typical applications: Resilient Suspensions meeting Military Standards Isolation of Sensitive Electronic Equipment Isolation of Generators, Pumps and Compressors Exhaust System suspension Isolation of Cabinets, Containers etc. Protection of Equipment during Transport Extreme Temperature Application - Standard materials (other qualities on request) Wire rope and threaded inserts: Steel AISI 316 Bars: Aluminium 66-T6 Finish: Chromated Load mode: Compression Typical load range: 3 11 kg at 1 Hz load A A A A A Load mode: 45 Compression/roll Typical load range: 15 7 kg at 1 Hz load A A A A A Fixture holes Lower bar Upper bar 6.5 mm 6.5 mm Inserts M6 II IY IM IY YY YM Inserts M6 IM YM MM Each cable mount has six alternative configurations with regard to fixture holes (ref. table to the left). When ordering, make your choice and add the code to the type number. Example: A YY Load mode: Shear and roll Typical load range: 4 2 kg at 12 Hz load A A A A A The number of wire loops can be less than 8, f. inst. 4 or 6, whereat the load range is correspondingly reduced. Height (H) Width (W) Mass A A A A A C.M. - 24

25 RD CABLE MOUNTINGS Combined all-metal multidirectional anti-vibration and antishock mountings. No aging Corrosion resistant Highly inherent damping Very low amplification at resonance Severe shock attenuation Wide temperature range (-18 C to +3) Maintenance free 1.7 SERIES A8 Typical applications: Resilient Suspensions meeting Military Standards Isolation of Sensitive Electronic Equipment Isolation of Generators, Pumps and Compressors Exhaust System suspension Isolation of Cabinets, Containers etc. Protection of Equipment during Transport Extreme Temperature Application Standard materials (other qualities on request) Wire rope and threaded inserts: Steel AISI 316 Bars: Aluminium 66-T6 Finish: Chromated Load mode: Compression Typical load range: 25 1 kg at 1 Hz load A A A A A Load mode: 45 Compression/roll Typical load range: 15 7 kg at 1 Hz load A A A A A Fixture holes Lower bar Upper bar 6.5 mm 6.5 mm Inserts M6 II IY IM IY YY YM Inserts M6 IM YM MM Each cable mount has six alternative configurations with regard to fixture holes (ref. table to the left). When ordering, make your choice and add the code to the type number. Example: A YY Load mode: Shear and roll Typical load range: 4 2 kg at 12 Hz load A A A A A The number of wire loops can be less than 8, f. inst. 4 or 6, whereat the load range is correspondingly reduced. Height (H) Width (W) Mass A A A A A C.M. - 25

26 RD CABLE MOUNTINGS Combined all-metal multidirectional anti-vibration and antishock mountings. No aging Corrosion resistant Highly inherent damping Very low amplification at resonance Severe shock attenuation Wide temperature range (-18 C to +3) Maintenance free 1.8 SERIES A1 Typical applications: Resilient Suspensions meeting Military Standards Isolation of Sensitive Electronic Equipment Isolation of Generators, Pumps and Compressors Exhaust System suspension Isolation of Cabinets, Containers etc. Protection of Equipment during Transport Extreme Temperature Application Standard materials (other qualities on request) Wire rope and threaded inserts: Steel AISI 316 Bars: Aluminium 66-T6 Finish: Chromated Load mode: Compression Typical load range: kg at 1 Hz load A A A A A Load mode: 45 Compression/roll Typical load range: 25 9 kg at 1 Hz load A A A A A Fixture holes Lower bar 9 mm Upper bar 9 mm Inserts M8 II IY IM IY YY YM Inserts M8 IM YM MM Each cable mount has six alternative configurations with regard to fixture holes (ref. table to the left). When ordering, make your choice and add the code to the type number. Example: A YY Load mode: Shear and roll Typical load range: 5 35 kg at 12 Hz load A A A A A The number of wire loops can be less than 8, f. inst. 4 or 6, whereat the load range is correspondingly reduced. Height (H) Width (W) Mass A A A A A C.M. - 26

27 RD CABLE MOUNTINGS Combined all-metal multidirectional anti-vibration and antishock mountings. No aging Corrosion resistant Highly inherent damping Very low amplification at resonance Severe shock attenuation Wide temperature range (-18 C to +3) Maintenance free 1.9 SERIES A13 Typical applications: Resilient Suspensions meeting Military Standards Isolation of Sensitive Electronic Equipment Isolation of Generators, Pumps and Compressors Exhaust System suspension Isolation of Cabinets, Containers etc. Protection of Equipment during Transport Extreme Temperature Application Standard materials (other qualities on request) Wire rope and threaded inserts: Steel AISI 316 Bars: Aluminium 66-T6 Finish: Chromated Load mode: Compression Typical load range: kg at 1 Hz load A A A A A Load mode: 45 Compression/roll Typical load range: kg at 1 Hz load A A A A A Fixture holes Lower bar 9 mm Upper bar 9 mm Inserts M8 II IY IM IY YY YM Inserts M8 IM YM MM Each cable mount has six alternative configurations with regard to fixture holes (ref. table to the left). When ordering, make your choice and add the code to the type number. Example: A YY Load mode: Shear and roll Typical load range: 15 9 kg at 12 Hz load A A A A A The number of wire loops can be less than 8, f. inst. 4 or 6, whereat the load range is correspondingly reduced. Height (H) Width (W) Mass A A A A A C.M. - 27

28 RD CABLE MOUNTINGS Combined all-metal multidirectional anti-vibration and antishock mountings. No aging Corrosion resistant Highly inherent damping Very low amplification at resonance Severe shock attenuation Wide temperature range (-18 C to +3) Maintenance free 1.1 SERIES A16 Typical applications: Resilient Suspensions meeting Military Standards Isolation of Sensitive Electronic Equipment Isolation of Generators, Pumps and Compressors Exhaust System suspension Isolation of Cabinets, Containers etc. Protection of Equipment during Transport Extreme Temperature Application Standard materials (other qualities on request) Wire rope and threaded inserts: Steel AISI 316 Bars: Aluminium 66-T6 Finish: Chromated Load mode: Compression Typical load range: kg at 1 Hz load A A A A A Load mode: 45 Compression/roll Typical load range: 85 4 kg at 1 Hz load A A A A A Fixture holes Lower bar 11 mm Upper bar 11 mm Inserts M1 II IY IM IY YY YM Inserts M1 IM YM MM Each cable mount has six alternative configurations with regard to fixture holes (ref. table to the left). When ordering, make your choice and add the code to the type number. Example: A YY Load mode: Shear and roll Typical load range: kg at 12 Hz load A A A A A The number of wire loops can be less than 8, f. inst. 4 or 6, whereat the load range is correspondingly reduced. Height (H) Width (W) Mass A A A A A C.M. - 28

29 RD CABLE MOUNTINGS Combined all-metal multidirectional anti-vibration and antishock mountings. No aging Corrosion resistant Highly inherent damping Very low amplification at resonance Severe shock attenuation Wide temperature range (-18 C to +3) Maintenance free 1.11 SERIES A22 Typical applications: Resilient Suspensions meeting Military Standards Isolation of Sensitive Electronic Equipment Isolation of Generators, Pumps and Compressors Exhaust System suspension Isolation of Cabinets, Containers etc. Protection of Equipment during Transport Extreme Temperature Application Standard materials (other qualities on request) Wire rope and threaded inserts: Steel AISI 316 Bars: Aluminium 66-T6 Finish: Chromated Load mode: Compression Typical load range: 2 1 kg Cable mount at 1 Hz load A A A A Load mode: 45 Compression/roll Typical load range: kg Cable mount at 1 Hz load A A A A Fixture holes Lower bar Upper bar 13.5 mm 13.5 mm Inserts M12 II IY IM IY YY YM Inserts M12 IM YM MM Each cable mount has six alternative configurations with regard to fixture holes (ref. table to the left). When ordering, make your choice and add the code to the type number. Example: A YY Load mode: Shear and roll Typical load range: 35 3 kg Cable mount at 12 Hz load A A A A The number of wire loops can be less than 8, f. inst. 4 or 6, whereat the load range is correspondingly reduced. Cable mount Height (H) Width (W) Mass A A A A C.M. - 29

30 4.1 Sandwich mounts general information Available with or without interleaf, the VRD 34/35 type mountings are produced in a range of rubber mixes (M45, MN5 and MN55) and sizes, close to stiffness tolerances, for use as main and auxiliary engine mountings. This type of mounting can also be used in earthquake area s. In that case, additional calculations are required. All mountings are individually tested and selected on stiffness. Sandwich mountings, horizontally mounted for stationairy applications For land-based / stationairy applications, sandwich mountings can be placed horizontally underneath the generatorset, in order to provide a resiliently mounted system. Selection of the amount and rubber hardness of the sandwich mountings, as well as the position of the sandwich mountings, is done based on the weight of the installation, and the disturbing frequencies that have to be isolated. Sandwich mountings are perfectly suited for these installations based on their high permanent workload capacity, and their excellent isolating capabilities, combined with a relatively low price. Besides, installation of these mountings is very easy, both on initial assembly as well as upon replacement of the sandwich mountings. V-system A combination of sandwich mountings arranged in a V system allows considerable flexibility to the designer. The important natural frequencies can be positioned into the excitation free frequency bands and in addition seaway and torque movements are relatively low at the coupling position. A V system applies to the installation of a main engine and particulary to a medium speed engine. With high speed engines the design is in most cases much simpler than that of the medium speed engine. The acoustic properties of the sandwich mountings are excellent. The result of the measured structure borne vibration and noise transmission are available. In both the vertical and horizontal direction, the transfer functions show in the low frequency range a decrease of 12 db/octave which can be compared with an ideal massless spring characteristic. We will be pleased to undertake all suspension design calculation and advise on mounting type, quantity, position and rubbermix to ensure a faultless flexible mounted installation. Before we can commence the design of a V system, detailed information is required. Mounting selection The selection chart is ideal for initial selection; however, it is advisable to seek expert advice before finalising an installation design. In practice most installations will be subject to both translational and rotational excitation and in consequence an analysis of all six degrees of freedom will be necessary. We will be pleased to advise on mounting numbers, rubber mix and mounting positions to ensure a faultless flexible mounted installation. Rubber Design gladly helps you with the engineering of your resilient mounted system. The necessary information in order to design such a system can be found on chapter 1.7 Vibration calculations are carried out using our specially developed computer programmes to meet new standards for both crews and passengers. Shock / earthquake The standard execution of the VRD 34/35 mountings can withstand shock-displacements up to 4% of the rubber height of the sandwich mount in lateral direction, and 2% in axial direction. This makes the mounting ideal for usage when equipment is placed in regions where earthquakes do occur. On application we can supply a special non-magnetic type manufactured in inoxida. Remarks It is our intention to maintain the excellent standard of our products. Modifications and improvements may be made from time to time and it is therefore advisable to contact us before ordering from the specifications given in this booklet. Approval The mountings and our calculation methods have been approved on many applications by the following classification societies: - Det Norske Veritas - Lloyd s Register of Shipping S.M. 3 Last revision

31 4.2 Technical data and fitting instructions Creeprate. The typical creepage of the RD sandwich mounts will vary with compound, rubber hardness, dynamic loads and strain. A typical figure for a natural rubber compound in 55 SH A, for loads in between the maximum static load marine application and half that load will be 2% of the static deflection increase per decade. 48 hours after loading, more than half of the total creepfigure over 2 years, will be achieved. approximately.1 mm / C in the range from 2 to 7 C. For instance the first thermal load from surrounding temperature to normal working temperature will cause an extra set of the deflected height next to the normal creep. Everytime the mount temperature is raised to the normal working temperature, no extra set will occur. Once the normal working temperature is exceeded, an extra set will occur again. The permanent set is directly related to the temperature of the rubber element. Thermal expansion. The typical thermal expansion rate of the RD sandwich mount will be approximately.3 mm / C increase in height depending on compound, rubber hardness and strain. The expansion rate is directly related to the temperature of the rubber element. Thermoshock. Every temperature exceeding the latest achieved peak temperature will cause a permanent set of the mount of Dynam ic factors Rubber Hardness Dynamic/static ratio Dynamic magnifier (shore.a) 45º º º º Installation instructions Mounting and adjustment instructions for horizontally placed sandwich mountings. The sandwich mountings must be mounted on the prepared brackets on the base frame. 1) Fit the sandwich mountings to the bracket on the base frame by means of four M16 bolts. 2) Align the generating set above the foundation frames. The mounting holes in sandwich mounting must be aligned with the holes in the foundation frames. 3) Place a steel chock on the foundation frame underneath each sandwich mounting. Thickness of steel chock: 2 mm. 4) Lower the generating set until it rests completely on the sandwich mountings 5) After 48 hours, level and load distribution should be checked by measuring the height of the sandwich mounting. The difference between the sandwich mountings should be as small as possible and should not exceed ± 2 mm. Example: H Average = 1 + H 2 + H N H n mm N = number of sandwich mountings The difference between the two sides of a sandwich mounting should not be more than 1 mm. 6) The mounting(s) with the largest deviation (from the average) should be adjusted first. by machining the steel chock or adding thin steel shims between the sandwich mounting and the steel chock. Mounting of sandwich elements on the foundation frame. 7) Fix all the sandwich mountings and the steel chocks to the foundation frame with four bolts per sandwich. Mounting and adjustment instructions for V-positioned sandwich mountings. This instructions can be sent upon request. S.M. 31 Last revision

32 4.3 Type VRD 34 L1 VRD 34 L M S VRD34L1 45 VRD34L1 5 VRD34L1 55 VRD34L Deflection in mm Rubber Hardness Compression Stiffness Shear Stiffness Max. Load Static (kn) Max. Load Marine (kn) Weight (shore.a) (kn/m) (kn/m) VRD 34 L1 45º VRD 34 L1 5º VRD 34 L1 55º VRD 34 L1 6º Please note that the maximum load will be limited in case of shock or earthquake requirements in order to be able to absorb the input energy. On application we can supply a special non-magnetic type manufactured in inoxida. S.M. 32 Last revision

33 4.4 Type VRD 35 S1 VRD 35 S M S 12 8 VRD35S1 45 VRD35S1 5 VRD35S1 55 VRD35S Deflection in mm Rubber Hardness Compression Stiffness Shear Stiffness Max. Load Static (kn) Max. Load Marine (kn) Weight (shore.a) (kn/m) (kn/m) VRD 35 S1 45º VRD 35 S1 5º VRD 35 S1 55º VRD 35 S1 6º Please note that the maximum load will be limited in case of shock or earthquake requirements in order to be able to absorb the input energy. On application we can supply a special non-magnetic type manufactured in inoxida. S.M. 33 Last revision

34 4.5 Type VRD 35 M1 VRD 35 M M S 15 1 VRD35M1 45 VRD35M1 5 VRD35M1 55 VRD35M Deflection in mm Rubber Hardness Compression Stiffness Shear Stiffness Max. Load Static (kn) Max. Load Marine (kn) Weight (shore.a) (kn/m) (kn/m) VRD 35 M1 45º VRD 35 M1 5º VRD 35 M1 55º VRD 35 M1 6º Please note that the maximum load will be limited in case of shock or earthquake requirements in order to be able to absorb the input energy. On application we can supply a special non-magnetic type manufactured in inoxida. S.M. 34 Last revision

35 4.6 Type VRD 35 L1 VRD 35 L1 5 4 M S 3 2 VRD35L1 45 VRD35L1 5 VRD35L1 55 VRD35L Deflection in mm Rubber Hardness Compression Stiffness Shear Stiffness Max. Load Static (kn) Max. Load Marine (kn) Weight (shore.a) (kn/m) (kn/m) VRD 35 L1 45º VRD 35 L1 5º VRD 35 L1 55º VRD 35 L1 6º Please note that the maximum load will be limited in case of shock or earthquake requirements in order to be able to absorb the input energy. On application we can supply a special non-magnetic type manufactured in inoxida. S.M. 35 Last revision

36 4.7 Information necessary to design a suitable flexible suspension with sandwich mountings Marine application Stationary application Main engines Auxiliary engines Exhaust system Deckhouse Control cabin Compressor unit Pump unit Generatorset Compressor unit Pump unit Miscellaneous Description of installation + drawing Manufacturer / type Number of cilinders / 2-4- stroke / L-V Mass Centre of gravity in X, Y, Z direction Mass moments of inertias 3 axes Number of mountings + positions Details flexible coupling(s) Details compensator(s) Reduction gearbox Operating speed + output Idling Operating speed + output Normal Operating speed + output Maximum Number of revolutions of propeller shaft Number of propeller blades Free forces / moments Type of vessel + classification Seaway conditions Shock conditions Ambient temperature Preserving requirements S.M. 36 Last revision

37 4.8 Maintenance of the sandwich mounts The life expectancy of the rubber elements will be approx. 2 years in ideal circumstances. Unfortunately, ideal circumstances are not feasible, therefore the (working) life expectancy will be approx. 1 years. The life expectancy of the rubber elements is dependent on the environmental circumstances (weather influences, contaminants, etc). A visual inspection of the sandwich mountings should be carried out six months after installation and should be repeated every year. For better recognition of damages, a blunt pin can be used. The use of a screwdriver is not advisable, because of the damage it can cause to the sandwich mountings. The use of a natural rubber (NR) compound for the rubber elements means that they are not oil resistant. The occasional occurrence of oil leaks does not effect the working of the sandwich mountings, because the oil will only damage the surface of the rubber elements. In case of oil contamination the rubber elements will show some signs of swelling. Certainly elements showing signs of severe swelling or evidence of rubber to metal separation should be replaced. To prevent damage caused by oil contamination, the rubber elements can be treated with an oil resistant coating. When cleaning the engine room with a solvent cleansing agent, it is advisable to cover up the sandwich mountings. If the cleansing agent still contaminates the rubber elements, they should be cleaned as follows. Storage, cleaning and maintenace of the rubber elements should be done in accordance with DIN The cleaning of the sandwich mountings should be done with a normal (household) cleansing agent. It is also advisable to use a glycerine-alcohol mixture (1:1). Do not use a solvent cleansing agent. If required, the customer can paint the sandwich mountings. Be aware that only the top- and baseplate of the sandwich mounting can be painted. Do not use paint on the rubber element as the rubber element might be contaminated and therefore be damaged. Each sandwich mounting has a serial number for identification, which will be used for replacement to deliver a complete new identical product or to replace the inserts of the mountings, in question with genuine inserts and/or parts. Type information can be found on the short side of the top baseplate. The above illustration gives the meaning of the used code. All deliveries are stored for over 2 years in a database including all relevant data and characteristics. V-positioned sandwich mountings In cases where it is necessary to replace the rubber insert, we advise to return the complete sandwich mounting to Rubber Design BV. The central buffer clearance should be examined and reset if necessary after the first week, after three months, and thereafter to fit in with normal maintenance programmes. S.M. 37 Last revision