SPACERS AND SPACER DAMPERS

Transcription

1 SPACERS AND SPACER DAMPERS 0

2 131 Contents General Spacer damper aluminium, for horizontal twin bundles Spacer damper aluminium, for vertical twin bundles Spacer damper aluminium, for triple bundles Spacer damper aluminium, for quadruple bundles Spacer Aluminium, casted, for twin bundles Spacer aluminium, forged, for twin bundles Spacer aluminium, forged, for triple bundles Spacer aluminium, forged, for quadruple bundles Flexible spacer with neoprene insert Rigid spacer for jumper loop, for twin bundles Rigid spacer for jumper loop, for triple bundles Rigid spacer for jumper loop, for quadruple bundles

3 132 Remark Mosdorfer offers a full range of Spacers and Spacer Dampers for bundled lines, including products from vibration control specialist s DAMP s.r.l. ( a wholly owned Mosdorfer GmbH company ( and fully integrated into the Knill Energy group based in Austria ( By combining years of expertise, long term service and relaibility, we offer a full range of spacers and spacer dampers for all types of bundle configuration and conductor applications. DAMP s.r.l. damping products are globally recognised and leaders in Overhead Line Vibration control. Our full range of spacers and spacer dampers, including rigid and semi flexible types complete our catalogue range. General Overhead line spacers add reliability and protection to the conductor bundle, by separating conductors preventing clashing under operating conditions. To provide this protection, it is necessary to install the correct number of spacers precisely positioned within each span. The spacing system protects the conductors from high wind and ice loadings by preventing sub-conductor clashing within the span. Spacers have controlled flexibility to also withstand high short circuit currents loads in compression and tension, to protect both conductors and spacers from damage. High-voltage line with spacer dampers For both single and bundled conductor systems, wind induced vibration can occur. On bundled systems, flexible spacers are recommended. Where high level system protection is required, spacers with energy absorption capabilities (damping elements) are recommended = SPACER DAMPERS. Short circuit test made on spacer dampers On tensioned overhead conductors, wind flow leads to high-frequency vibrations, with amplitudes in the magnitude of one conductor diameter. This is caused by vortex shedding, which excites the conductor into Aeolian vibrations at right angles to the wind direction. Aeolian vibration occurs at wind velocities of approximately 1-7m/s causing vibration frequencies of Hz dependent on conductor diameter and tension.

4 133 These vibrations will lead to internal conductor fatigue stress at suspension and tension fittings, applying compression and bending loads at conductor support points. As vibration increases, higher tensile loads are applied. Wind induced vibrations vertical to the wind flow Line routes along flat terrain or spanning valleys require higher levels of protection, particularly where prevailing wind directions are perpendicular to the line route. Fatigue stresses will damage the conductor, causing strand breakage and cable failure. Insulator string ball fittings and turnbuckles are particularly at risk due to their specific shapes. For conductor bundle tension and support fitting protection, spacer dampers offer a level of protection that reduce stresses within the system to safe operating levels, protecting long term fatigue failures during the operational life of the network. As well as higher frequency vibrations, lower frequency sub-conductor vibrations are also present. Safe border line for an al-alloy cable These occur at wind velocities of approx m/s and move conductors towards one another at frequencies 5Hz. The spacing system also provides protection against sub-conductor clashing at these lower frequency-higher amplitude vibrations. Subconductor vibration Spacer dampers consist of conductor clamps, a connecting frame with damping elements. These elements are manufactured from highly elastic macro- molecular elastomers with high energy absorption properties that damp harmful vibrations. These elements also provide the necessary flexibility and stiffness in all directions of installed conductor movement and motion. Arrangement of the damping elements

5 134 Computational programs MOSDORFER and DAMP have developed computational programs for all bundle configurations for high-frequency aeolian vibrations (Karman vibrations) including subconductor vibrations. Simulation of a vibration For high-frequency vibrations, maximum bending stresses at the clamp outlet and fastening points of spacers will be calculated depending on the frequency. The use of Stockbridge dampers can also be considered and integrated into calculations. These computations are based on the principle of energy balance. Mechanism of bundle conductor vibrations According to this principle, energy fed by wind will be withdrawn from the system by the self-damping power of the conductors and damping of the spacer dampers. The principle of energy balance also forms the basis for calculating the bundle conductor vibrations caused by coupling of the conductor that is in the wake. Coupling will lead to instabilities of the socalled flutter type. The dynamic bending stresses, forces and rotation of the spacer clamps will be calculated. The system also calculates bundle separation of spacers, which avoids higher stress caused by possible resonance within the span. Installation distances of spacers Field measurements on existing overhead lines Existing vibration measurements from existing lines contain valuable data for making vibration studies. MOSDORFER - DAMP are active making field measurements, which assist with system life expectancy calculations. Vibration recorder By using these measurements, (each taking approximately 3 months), combined with conductor self damping tests in Mosdorfer own laboratory, our recommendations can be optimised to offer economic solutions for system protection.

6 135 Material Spacers are made of very different materials, high-grade cast aluminium are preferred for frames and clamps. Some spacer bodies are also partly forged. For clamps, high-strength screws with or without shear head huts are mostly be used. Damping element elastomers have high fatigue life, resistant to UV and ozone attack with high energy absorption properties. High temperature resistant elastomer clamp liners can be specified for conductor temperatures 235 C. All products are manufactured in accordance to IEC Overhead lines - Requirements and tests for spacers - and special customer requirements. This includes high corona resistant clamps for ultra- high system voltages. We offer many product variants adapted for specific customer requirements. Our standard range only is included within the catalogue. Examples of other types are described in detail below: Spacers Rigid spacers for jumpers for vertical and horizontal twin bundles Where conductor connections are short, it is not always necessary to use more expensive flexible spacers. This type is also available for triple and quadruple bundles shown in the Tables. Other designs are also available. Rigid spacers for jumper loops are often equipped with counterweights to create tower clearance. Rigid spacers for jumpers with counterweights These variants can be used for all bundle configurations. Flexible spacers for horizontal and vertical twin bundles with bodies made of aluminium (System LORÜNSER) These spacers are made of moving clamp bodies connected by means of a spacing piece. The clamp bodies are guided over steel bolts and are free to move in one direction. Flexible spacer To provide the optimum bolt connection, the bore in the link is equipped with a stainless sleeve for high durability.

7 136 Flexible spacers with neoprene washers for horizontal and vertical twin bundles These spacers are made of moving clamp bodies connected by means of a spacing piece. Flexible spacer with Neoprene washers The clamp bodies are guided over steel bolts and are free to move in all directions. Neoprene washers fixed between the body and clamps have some damping effect preventing noise. To protect the conductors, neoprene washers are shaped to reduce connecting stresses during bundle movement. Flexible spacer for big conductors For big conductors and assemblies using heliformed rods, a double bolt clamp type is available. Spacers with neoprene inserts These spacers are made up of two frames with electrically semi-conducting neoprene inserts, linked by a hinge and fixed to the frames. Spacer with neoprene inserts for a twin bundle They have no moving parts avoiding damage by vibration. Movements between conductors are absorbed by the neoprene inserts. Alternatively, spacers can be equipped with equipotential bonding. The types with forged aluminium bodies are available for twin, triple and quadruple bundles. Forged spacer for a quadruple bundle The cast version is available for twin bundles. Model with a hinge type clamp and tensioning bolt Due to its shape, this spacer has a corona extinction voltage that is particularly high. Tensioning bolts fixed by means of a special tool assist with easy and quick assembly. Spacer with a hinge type clamp For high-temperature conductor application, a heat resistant silicone blend used.

8 137 Rotary spacer with damping links for suspension strings with horizontal twin bundle conductors and for four bundle conductors The idea behind this is that each of the conductors arranged horizontally is separately fixed to an insulator. The live connection of the insulator is provided by the rotary spacers arranged at a distance of approx. 1 m. If one string breaks, the loads will be transmitted from the intact string extremely gently. Rotary spacer with damping links Spacer dampers The spacer dampers described in the tables are a selection of types most commonly used, where the system of fastening to the conductor can be varied e.g. clamps fixed by using heliformed rods with neoprene clamp liners to offer added conductor protection. As previously described, non-damping spacers, and spacer dampers include models with hinge type clamps and tensioning bolts. Both types have excellent corona behaviour. Spacer damper, fixing with heliformed rods Spacer damper with a hinge type clamp and a tensioning bolt For Wildlife protection, Bird Flight Diverters can also be fitted. Spacer dampers with areas warning birds

9 138 Spacer damper aluminium, for horizontal twin bundles material: aluminium, casted; steel, hot dip galvanized; Neoprene /40 1,0-21, , /45 21,6-23, 400 2, /50 24,0-25, 400 2, /55 26,0-2, , /55 26,0-2, , /60 2,1-30, , /65 30,8-33, , /65 30,8-33, , /72/K 33,1-35, , /75 35,6-38, , /75 35,6-38, ,40 Models with clamps of the hinge type or clamps with neoprene inserts and fixing with heliformed rods are available upon request. All types can be delivered with shear head hats and a flexible potential equalisation. Other dimensions are available upon request. A Spacer damper aluminium, for vertical twin bundles material: aluminium, casted; steel, hot dip galvanized; Neoprene /45 21,6-23, 400 3, /65 30,8-33, , /75 35,6-38, ,60 Models with clamps of the hinge type or clamps with neoprene inserts and fixing with heliformed rods are available upon request. All types can be delivered with shear head hats and a flexible potential equalisation. Other dimensions are available upon request. A

10 13 Spacer damper aluminium, for triple bundles material: aluminium, casted; steel, hot dip galvanized; Neoprene /50 24,0-25, 400 4, /50 24,0-25, 500 4, /55 26,0-2, , /55 26,0-2, , /60 2,1-30, , /65 30,8-33, , /75 35,6-38, ,30 Models with clamps of the hinge type or clamps with neoprene inserts and fixing with heliformed rods are available upon request. All types can be delivered with shear head hats and a flexible potential equalisation. Other dimensions are available upon request. A Spacer damper aluminium, for quadruple bundles material: aluminium, casted; steel, hot dip galvanized; Neoprene /45 21,6-23, 400 5, /50 24,0-25, 400 5, /55 26,0-2, , /60 2,1-30, , /65 30,8-33, ,00 Models with clamps of the hinge type or clamps with neoprene inserts and fixing with heliformed rods are available upon request. All types can be delivered with shear head hats and a flexible potential equalisation. Spacers for diamond quadruple bundles are available upon request. Other dimensions are available upon request. A

11 140 Spacer Aluminium, casted, for twin bundles material: aluminium, casted; steel, hot dip galvanized; Neoprene /00 18,1-20, , /02 20,1-22, , /03 22,1-24, , /04 24,1-26, , /04 24,1-26, , /05 26,1-28, , /06 28,1-30, , /06 28,1-30, , /07 30,1-32, , /07 30,1-32, , /08 32,1-34, , /0 34,1-36, ,10 All parts are captive. The small connecting loop of the neoprene parts tightly mounted in the clamp body ensures ease of assembly without the field spacer having to be dismounted. Sufficient movement within the conductor is guaranteed by elastic neoprene. These field spacers with a semi-conducting neoprene insert can also be delivered with a contact spring to enable potential equalisation. Other dimensions are available upon request. A Spacer aluminium, forged, for twin bundles material: aluminium, forged; steel, hot dip galvanized; Neoprene ,1-20, , /P 20,1-22, , ,1-24, , ,1-26, , ,1-28, , ,1-30, , /1 30,1-32, , ,1-34, ,10 All parts are captive. The small connecting loop of the neoprene parts tightly mounted in the clamp body ensures ease of assembly without the field spacer having to be dismounted. Sufficient movement within the conductor is guaranteed by elastic neoprene. These field spacers with a semi-conducting neoprene insert can also be delivered with a contact spring to enable potential equalisation. The screw configuration will, in combination with the defined supporting points, result in a pre-tensioning force of the clamping body to the conductors. Other dimensions are available upon request. A

12 141 Spacer aluminium, forged, for triple bundles material: aluminium, forged; steel, hot dip galvanized; Neoprene ,1-28, , ,1-30, , /06 30,1-32, , ,1-34, , /0 34,1-36, ,0 All parts are captive. The small connecting loop of the neoprene parts tightly mounted in the clamp body ensures ease of assembly without the field spacer having to be dismounted. Sufficient movement within the conductor is guaranteed by elastic neoprene. These field spacers with a semi-conducting neoprene insert can also be delivered with a contact spring to enable potential equalisation. The screw configuration will, in combination with the defined supporting points, result in a pre-tensioning force of the clamping body to the conductors. Other dimensions are available upon request. A Spacer aluminium, forged, for quadruple bundles material: aluminium, forged; steel, hot dip galvanized; Neoprene A /12 22,1-24, ,10 All parts are captive. The small connecting loop of the neoprene parts tightly mounted in the clamp body ensures ease of assembly without the field spacer having to be dismounted. Sufficient movement within the conductor is guaranteed by elastic neoprene. These field spacers with a semi-conducting neoprene insert can also be delivered with a contact spring to enable potential equalisation. The screw configuration will, in combination with the defined supporting points, result in a pre-tensioning force of the clamping body to the conductors. Other dimensions are available upon request.

13 142 Flexible spacer with neoprene insert material: aluminium, casted; steel, hot dip galvanized; Neoprene ,0-24, , ,5-26, , ,0-30, , ,5-32, , ,0-33, , ,5-35, , ,5-35, , ,0-36, , ,0-3, , ,0-3, ,20 For horizontal and vertical twin bundles. The neoprene washers fixed between the body and clamps have some damping effect. Other dimensions are available upon request. A Rigid spacer for jumper loop, for twin bundles material: aluminium, extruded; steel, hot dip galvanized A Width ,10-20, , /50 18,10-20, , /52 20,10-22, , /52 20,10-22, , /03 22,10-24, , /53 22,10-24, , /53 22,10-24, , ,10-24, , /04 24,10-26, , /04 24,10-26, , ,10-26, , /05 26,10-28, , /05 26,10-28, , ,10-28, , /06 28,10-30, , ,10-30, , ,10-30, , /07 30,10-32, , /07 30,10-32, , ,10-32, , /68 32,10-34, , ,10-34, , /68 32,10-34, , /6 34,10-36, , /510 36,10-38, ,80

14 143 material: aluminium, extruded; steel, hot dip galvanized A Width ,10-38, , /611 38,10-40, , /611 38,10-40, , ,10-42, , ,10-44, ,80 These field spacers are exclusively suitable for loops and can also be equipped with counterweights. Other types are available upon request. Rigid spacer for jumper loop, for triple bundles material: aluminium, extruded; steel, hot dip galvanized /04 24,10-26, , ,10-30, , ,10-30, , ,10-32, , ,10-34, , ,10-36, , ,10-40, ,40 These field spacers are exclusively suitable for loops and can also be equipped with counterweights. Other types are available upon request. A Rigid spacer for jumper loop, for quadruple bundles material: aluminium, extruded; steel, hot dip galvanized /03 22,10-24, , /03/1 22,10-24, , ,10-26, , /54 24,10-26, , ,10-28, , ,10-30, , ,10-30, , ,10-30, , /57 30,10-32, , ,10-32, , /58 32,10-34, , /58 32,10-34, ,80 A

15 144 material: aluminium, extruded; steel, hot dip galvanized ,10-36, , ,10-38, , ,10-40, ,30 These field spacers are exclusively suitable for loops and can also be equipped with counterweights. Other types are available upon request. A

16 VIBRATION DAMPERS 10

17 10 VIBRATION DAMPERS 145 Contents General Stockbridge damper with casted clamp, for aluminium based conductors Stockbridge damper with forged clamp, for aluminium based conductors Stockbridge damper with bell weights, with forged clamp Bretelle clamp for damping wire, closed type Bretelle clamp for damping wire, open type

18 VIBRATION DAMPERS General On tensioned overhead conductors, wind flow leads to high-frequency vibrations, with amplitudes in the magnitude of one conductor diameter. Vortex shedding at a laminar wind inflow This is caused by vortex shedding, which excites the conductor into Aeolian vibrations at right angles to the wind direction. Wind induced vibrations vertical to the wind flow Aeolian vibration occurs at wind velocities of approximately 1-7m/s causing vibration frequencies of Hz, dependent on conductor diameter and tension. These vibrations will lead to internal conductor fatigue stress at suspension and tension fittings, applying compression and bending loads at conductor support points. As higher tensile loads are applied vibration increases. Line routes along flat terrain or spanning valleys require higher levels of protection, particularly where prevailing wind directions are perpendicular to the line route. Fatigue stresses will damage the conductor, causing strand breakage and cable failure. Insulator string ball fittings and turnbuckles are particularly at risk due to their specific shapes. Safe border line for an al-alloy cable Stockbridge damper with 4 resonances with open weights For the conductor, including tension and support fitting protection, suitable vibration dampers offer a level of protection that reduce stresses within the system to safe operating levels, protecting from long term fatigue failures during the operational life of the network. Stockbridge dampers Since construction of the first overhead lines, there have been problems with vibrations. Very soon, the Stockbridge Vibration Damper (named after its inventor) proved to be a most effective type of damper. These dampers are a combined energy absorbing resonance type, that damp all frequencies that occur as part of an energy balanced system. MOSDORFER dampers work particularly well, where the wind energy will be partly absorbed by the conductor, and the remaining majority absorbed by the damper.

19 10 VIBRATION DAMPERS 147 This method of system damping is only effective if the conductor and damper are harmonized. This requires that damper weights and messenger cable lengths are compatible with the conductor. This design harmonization makes it possible to offer dampers with 2 or 4 resonance frequencies, which do not overload the conductor at the clamp interface, or over stress the messenger cable. Energy consumption of a 4R damper Vibration studies For an energy balanced system, it is therefore necessary to ensure that the dampers are tuned and compatible with the conductor system. A vibration study considers line route terrain, climatic conditions, conductor data (Conductor Data Sheet) line tension, configuration, span lengths, system voltage, and self-damping characteristics of the conductor if known. Data from existing lines, suspension and tension arrangements are also required when available. Vibration study: bending stresses with and without dampers This data enables MOSDORFER to make vibration studies, choose the most suitable damper type, and recommend both quantities and positioning within the span to protect the system. Field measurements on existing overhead lines Existing vibration measurements from existing lines valuable data for making vibration studies. MOSDORFER-DAMP are active making field measurements, which assist with system life expectancy calculations. By using these measurements, (each taking approximately 3 months) combined with conductor self damping tests in MOSDORFER s own laboratory, our recommendations can be optimised to offer economic solutions for system protection. Field measurement with recorder at a HSU clamp Types of dampers Standard Stockbridge damper types have open weights cast onto the messenger cable. Conductor clamps are manufactured in aluminium, either forged or cast. Messenger wires are manufactured from high tensile hot dip galvanized steel or stainless steel wires, constructed to incorporate good energy dissipation and damping properties. Screws and nuts for cast clamps are hot dip galvanized. Forged clamps use stainless steel screws.

20 VIBRATION DAMPERS Different design features are possible, with the following variations available: Stockbridge dampers with bell weights Damper with special clamps Damper with a protected damper wire Damper weights Bell-shaped damper weights are available for all types. These have superior high voltage corona properties; particularly suitable for vertical twin bundles. The damper weights can also be fixed to the conductor by means of pressed tapered cones. Clamps For copper conductor compatibility and applications, forged copper alloy clamps or bimetallic (copper-aluminium) conductor clamp grove sleeves are available. For larger non-standard conductors, special clamps are also available. Messenger damper wire For highly corrosive atmospheres and regions, stainless steel material may be necessary. For additional corrosive protection of all messenger cable types, sealed elastomer sleeves are also available. Dampers for fibre optic cables These dampers are generally lighter weight types with bigger clamps as they are mounted on heliformed rods. These are described in detail in Part 18 of the catalogue, including Spiral dampers. Break away huts For correct tightening of the screws break away huts can also be supplied. Testing and inspection of the dampers Vibration dampers, both dynamic performance and physical properties are developed, tested and checked in accordance with EN Overhead lines - Requirements and tests for Stockbridge type Aeolian vibration dampers. High Voltage Corona and partial discharge testing is made in accordance with EN Overhead lines - Requirements and tests for fittings. Ferrous component galvanization and tests are made in accordance with ISO EN 1461 Hot dip galvanized coating on fabricated iron and steel articles - Specifications and test methods. Stainless steel components conform to - ISO EN Mechanical properties of corrosion-resistant stainless steel fasteners.

21 10 VIBRATION DAMPERS 14 Armour rods Helical wire fittings are made of formed round wire rods, with the ends shaped depending on the material and diameter. The formed diameters of the wires are smaller than the diameter of cable to be applied. This creates uniform radial pre compression of the spiral without permanent distortion of the wires or sub-sets. This applies the initial low stress grip of the cable, which increases as a resultant of higher tension forces that convert to high frictional grip. Uniform radial loads and grip increase over a longer application and contact length that provide low relative and uniform radial stress. The reinforcement of the cross section causes lower conductor stresses. Identification and labelling of products are in accordance with IEC (Rules of behaviour with respect to possible hazards when dealing with electric equipment and equipment employing similar techniques) will either be printed on individual rod sets or stated on a label connected to the set. The lay direction of the helical rods is normally same as that of the outermost layer of the conductor, typically right hand lay. The material used is the same as that of the conductor. Example for round wire rods Bretelle clamps These clamps are specially intended for the installation of conductor loops. These loops primarily have a damping function but they will also help to prevent conductor rupture. The clamping grooves are designed to achieve a high slipping load. The conductor channel of the Bretelle conductor is grooved whereas the channel for the conductor is serrated in order to make it possible to protect the conductor without affecting the clamp function. Two types are available: Open tpye: with a continuous channel for the conductor (multiple loops). Closed type: the closed end guarantees optimal corona protection. An internal recess serves to take up the binding clamp. The installation distance will be calculated upon request. Example for Bretelle clamps

22 VIBRATION DAMPERS Stockbridge damper with casted clamp for aluminium based conductors material: aluminium, casted; steel, hot dip galvanized; cast iron, hot dip galvanized screws version /G/1 7,0-14,0 M10 1 1, ,0-14,0 M10 2 1, /G/1 7,0-14,0 M10 2 2, /G/1 14,0-16,5 M10 1 1, /G/1 14,0-16,5 M10 2 2, /G/1 14,0-1,0 M12 2 2, /G/1 16,6-1,0 M10 1 1, /G/1 1,0-2,0 M14 1 2, /G/1 1,0-2,0 M14 1 4, /G/1 1,0-2,0 M14 1 6, /G/1 1,0-2,0 M14 2 2, /G/1 1,0-2,0 M14 2 5, /G/1 28,5-41,0 M14 1 4, /G/1 28,5-41,0 M14 1 6, /G/1 28,5-41,0 M14 2 2, /G/1 28,5-41,0 M14 2 5,17 Version 1 covers two resonant frequencies and version 2 covers four resonant frequencies. The weights are casted onto the messenger wire. Models with compression sleeve are available upon request. Models with stainless steel messenger wire are available upon request. Other types are available upon request. Stockbridge damper with forged clamp for aluminium based conductors material: aluminium, forged; steel, hot dip galvanized; cast iron, hot dip galvanized screws version /EA1 11,0-14,5 M10 1 1, /EA1 11,0-14,5 M10 2 2, /EA1 14,5-17,0 M10 1 1, /EA1 14,5-17,0 M10 2 2, /EA1 17,0-1,5 M10 1 1, /EA1 1,5-22,0 M12 1 1, /EA1 1,5-22,0 M12 1 3, /EA1 1,5-22,0 M12 2 2, /EA1 22,0-24,5 M12 1 1, /EA1 22,0-24,5 M12 1 3, /EA1 22,0-24,5 M12 2 2, /EA1 24,5-28,0 M12 1 1, /EA1 24,5-28,0 M12 1 4, /EA1 24,5-28,0 M12 2 2, /EA1 28,0-31,0 M12 1 4,00

23 10 VIBRATION DAMPERS 151 material: aluminium, forged; steel, hot dip galvanized; cast iron, hot dip galvanized screws version /EA1 28,0-31,0 M12 2 2, /EA1 31,0-33,0 M12 1 4, /EA1 31,0-33,0 M12 1 5, /EA1 31,0-33,0 M12 2 2, /EA1 33,0-35,0 M12 1 4, /EA1 33,0-35,0 M12 2 2, /EA1 35,0-38,0 M12 1 4, /EA1 35,0-38,0 M12 1 6, /EA1 35,0-38,0 M12 1 8, /EA1 38,0-42,0 M12 1 4, /EA1 38,0-42,0 M12 1 6, /EA1 42,0-46,0 M12 1 4, /EA1 42,0-46,0 M12 1 6,00 Version 1 covers two resonant frequencies and version 2 covers four resonant frequencies. The weights are casted onto the messenger wire. Models with compression sleeve are available upon request. Models with stainless steel messenger wire are available upon request. Other types are available upon request. Stockbridge damper with bell weights, with forged clamp material: aluminium, forged; steel, hot dip galvanized; cast iron, hot dip galvanized screws ,0-11,0 M10 2, ,0-14,5 M10 1, ,0-14,5 M10 2, ,5-17,0 M10 1, ,5-17,0 M10 3, ,5-22,0 M12 3, ,5-22,0 M12 4, ,0-24,5 M12 3, ,0-24,5 M12 4, ,5-28,0 M12 3, ,5-28,0 M12 5, ,5-28,0 M12 5, ,0-31,0 M12 3, ,0-31,0 M12 5, ,0-31,0 M12 5, ,0-33,0 M12 3, ,0-33,0 M12 5, ,0-33,0 M12, ,0-35,0 M12 5, ,0-38,0 M12 5, ,0-38,0 M12 6, ,0-38,0 M12,00

24 VIBRATION DAMPERS material: aluminium, forged; steel, hot dip galvanized; cast iron, hot dip galvanized screws ,0-46,0 M12, , M14 0,00 The weights are casted onto the messenger wire. Models with compression sleeve are available upon request. Models with stainless steel messenger wire are available upon request. Other types are available upon request. Bretelle clamp for damping wire closed type material: aluminium, forged; steel, hot dip galvanized A screws ,5-20, , /1 20,5-23, , ,5-26, , ,5-27, , ,5-32, , ,0-36, , ,3-41, , /DC 38, ,50 Bretelle clamps with stainless bolts on request.

25 10 VIBRATION DAMPERS 153 Bretelle clamp for damping wire open type material: aluminium, forged; steel, hot dip galvanized A screws ,5-21, , , , ,5-27, , ,0-36, , ,3-41, , /DC 38, ,50 Bretelle clamps with stainless bolts on request.