Coolers. Liquid HELPMAN. DX liquid coolers VKS, VKK and VK Flooded liquid coolers VKBN and VKN Selection programme available on request

Transcription

1 70.72 DX liquid coolers VKS, VKK and VK Flooded liquid coolers VKBN and VKN Selection programme available on request Liquid Coolers Liquid cooler models VKS, VKK, VK, VKBN and VKN HELPMAN

2 Contents Cooler model Tubing Capacity range Page DX Coolers VKS Internal spiralized SF Copper kw 4-9 VKK Inner fin SF Copper kw VK Plain steel kw Flooded Coolers VKBN Plain steel kw VKN Plain steel kw Combined Catalogue This brochure is a collection of 5 separate product leaflets. Listed in this brochure are technical data and dimensions of the following liquid cooler models : H(C)FC Ammonia - VKS - VK - VKK - VKBN - VKBN - VKN - VKN All texts referring to capacity selection have been left out. For capacity selection we now refer to our computer selection programme, which is available on request. Individual product brochures are no longer available. Helpman Shell & Tube Products BV Changes possible without prior notice 2

3 Users manual for DX Coolers VKS, VKK or VK Special designs Standard direct expansion (dx) coolers are supplied in the design as given in this catalogue. The coolers VKS, VKK and VK are normally used in closed water systems, so that no corrosion problems are to be expected. If the cooler is operating in an open water system there is the danger of corrosion attack mainly to the steel parts of the cooler. Corrosion of the baffle plates may quickly lead to duty reduction by shortcircuiting of the waterflow. It is therefore essential to ensure a good water treatment to prevent corrosion. It is also possible to use special materials for agressive water conditions. It is essential to consider the design water flow strictly. Exceeding the maximum allowable water velocity may lead to erosion and erosion-corrosion attack to the internal surfaces. Strong fouling at the water side may also lead locally to higher water velocities. The presence of solid particles in the circulating waterflow, like silt or sand may damage the cooler internally and should be avoided. The cooler should be mounted free from vibrations. Apart from mechanical damage, vibrations may add to erosion-corrosion phenomena. The cover gasket of the standard cooler is made of neoprene rubber, specially selected on freon resistancy and elasticity under low temperature. The good sealing properties of this material is best maintained if the cooler remains under pressure after commissioning. Closing down an installation filled with refrigerant during a long period may cause the gasket to shrink and reduce its elasticity. This may cause leakages when restarting the plant. In order to achieve the required super heat of the refrigerant the water inlet connection shall be choosen at the refrigerant suction connection side. Corrosion resistance design waterside Shell and connection stubs can be executed in stainless steel or Cu-Ni alloys. For the baffle plate assembly stainless steel supporting rods and baffle plates of stainless steel, Cu-Ni or brass are available. The special tubes with spiral innerfin are also available in CuNi10 Fe1 Mn acc. to DIN and steel St35.8 acc. to DIN Tubes in stainless steel, Alu-brass or other Cu-Ni alloys are possible too, but without the spiralized inner surface. Special design on request. Low temperature application For design temperatures below -10 C the construction and/or material choice has to be adapted depending from the rules of the inspection authorities. For temperatures between -20 C and -40 C special Novapress gasket material is used. Multi-circuiting (Duplexing) The direct expansion coolers can be supplied with two independant refrigerant circuits (duplexing). More than two circuits on request only. The maximum allowable pressure difference between the circuits is 10 bar. Multiple circuiting on the waterside is not possible. Helpman Shell & Tube Products BV Changes possible without prior notice 3

4 VKS Model indication Example : VKS S - * - ** VKS Liquid cooler equipped with tubes with spiralized inner surface 14 Code for shell diameter 250 Effective length in cm (nominal length) S Code for baffle spacing * Number of refrigerant passes ** Code for special design General information Liquid cooler, suitable for all halocarbon refrigerants. Duty range 25 up to 2000 kw with a cooling surface 2 up to 100 m 2. The most important application is cooling of water and water-glycol mixtures. Standard design is for application in closed water systems. For special waterconditions or special liquids like water-glycol a suitable quotation can be given on request. Intensive research and testing supported by a computer model has produced a series of 72 basic models with 12 shell diameters and 6 standard lengths. Varying the number of refrigerant passes in combination with two different baffle spacings gives the possibility to select most efficient type VKS for a given application. The liquid cooler is suitable for all halocarbon refrigerants. The duty range covers 25 up to 2000 kw with a cooling surface 2 up to 100 m 2. System Direct expansion of the refrigerant provides a liquid-gas mixture in the cooler. This refrigerant passes through the tubes. The tubes are of a special type having an internal spiralfinning giving an optimum between heat transfer coefficient and pressure drop. For every application the most efficient distribution of the refrigerant per tube and per pass has been calculated. The water-glycol flow is guided through the shell by means of baffle plates. Helpman Shell & Tube Products BV Changes possible without prior notice 4

5 VKS Design Shell Seamless steel tube : St 35.8 according to DIN For type VKS 18, 20, 22 and 24 : plate material P265GH to EN Shell side is equipped with a drain and purge connection. Tube plate / Tube Tubeplate: P265 GH to EN Tubes: SF-Copper to DIN The holes in the tube plate are double grooved to give a better resistance against thermal tension. The tubes have a spiralized internal finning. The tubes are rolled into the tube plate. Covers/Gaskets Covers: P265 GH acc. to EN Bolts: 8.8 acording to DIN 267 Gaskets: Neoprene-composite material to Helpman specification. The covers are machined from solid steel plate material and are grooved to have a confined gasket. Baffle plate assembly Baffle plates ST 37-2 to DIN Support rods: St 37-2 to DIN Spacers: Sst 2 to DIN Depending on type of cooler there are 2 baffle spacings available (S and T in the type number). Baffle plate set is fixed by supporting rods. Refrigerant connections Connection St 37.0 according to DIN 2448/1629/3 executed as welding/soldering stub blanked off with a welded disc. Water connections Stubs 35.8 to DIN with flange R.St 37.2 to DIN , sized to DIN Each connection is provided with a 1/2" BSP female pocket. Counter flanges available on request. Finish The refrigerant side is dehydrated and filled with a nitrogen protection charge. The shell is internally shot blasted and protected by a phosphate treatment. The shell exernal is shot blasted to quality SA 2 1/2 and finished with a primer layer. Operating conditions Operating Operating temperature pressure max. min. max. C C bar Refr. side * 16.5 Liquid side * 10 * Freezing protection equipment to be provided by client Application beyond above values possible on request only Construction codes Materials and stress calculation meet the requirements of AD-Merkblätter (FRG Rules) The construction of the VKS coolers can be accepted by following inspection authorities : Stoomwezen Lloyd s R.o.S. TÜV Bureau Veritas A.B.o.S. Germanischer Lloyd DNV As per inspection authority certain details may require modification, prices are given on request only. Helpman Shell & Tube Products BV Changes possible without prior notice 5

6 VKS Quality control Construction For all standard VKS coolers, strength calculations have been made according to AD-Merkblätter. Strength calculations in accordance with the rules of the inspection authorities mentioned on page 4 can be supplied on request. The standard coolers are pressure tested while submerged under water: Test pressure refrigerant side 22 bar. Test pressure liquid side 13 bar. Pressure tests in accordance with the rules of the inspection authorities as listed, are possible on request. Leaktest The standard coolers are submitted to following leaktest: Tube/tubeplate connection: Pneumatic test on shell side at 13 bar during 24 hours, tested while unit is submerged under water. Cover/gasket/tubeplate: Pneumatic test on tube side at 22 bar while unit is submerged under water. Other test procedures on request. Dehydration The standard liquid cooler is blown through with dry compressed air and dehydrated by evacuation. The vacuum-dryness test is based on a stable pressure of 10 mbar maintained for 30 minutes. Quality assurance Quality assurance is based on ISO Dimensions of the standard coolers are in accordance with the tolerance class of DIN E. Factory certificate and production report are available on request. Duties Water Selected Duty Pressure drop Tube flow type water side surface m 3 /h VKS kw bar m S S S T T T T T T T T T T Nominal duty The nominal duty is based on following conditions: Water inlet temperature: +12 C Water outlet temperature: + 7 C Evaporating temperature: + 2 C Refr. liquid temperature: +30 C Refrigerant: R 22 Fouling factor: 0.86 x 10-4 m 2 K/W Refrigerant superheating of 60 % of the difference between the water inlet temperature and the evaporating temperature (DT 1 ) has been taken into account. An optimal cooler selection is obtained by means of a computer program. Helpman Shell & Tube Products BV Changes possible without prior notice 6

7 VKS Technical Data Type Nominal length in cm (L nom ) VKS Tube surface * Number of tubes Max. allowable ** waterflow Int. vol. (refr. side) Int. vol. (water side) Weight excl. feet Int. vol. (refr. side) Int. vol. (water side) Weight excl. feet Int. vol. (refr. side) Int. vol. (water side) Weight excl. feet Int. vol. (refr. side) Int. vol. (water side) Weight excl. feet Int. vol. (refr. side) Int. vol. (water side) Weight excl. feet Int. vol. (refr. side) Int. vol. (water side) Weight excl. feet m 2 /m m 3 /h dm 3 dm 3 kg dm 3 dm 3 kg dm 3 dm 3 kg dm 3 dm 3 kg S T S T S T S T S T S T S T S T S T S T S T S T dm 3 dm 3 kg dm 3 dm 3 kg * External tube surface per meter nominal cooler length. ** These values not to be exceeded in view of allowable water velocities. Helpman Shell & Tube Products BV Changes possible without prior notice 7

8 VKS Dimensions Type Nominal length in cm (L nom ) VKS C B A max C B A max C B A max C B A max S/T S/T S/T S/T S/T S/T S/T S/T S/T S T S T S T C B A max C B A max Helpman Shell & Tube Products BV Changes possible without prior notice 8

9 VKS Dimensions Type Dimensions Water- VKS F G D d E H H 2 conn. N S NW T NW S NW T NW S NW T NW S NW T NW S NW T NW S NW T NW S NW T NW S NW T NW S NW T NW S NW T NW S NW T NW S NW T NW 250 A (max) = C = E H d D N H2 Go = B = L nom F 30 Helpman Shell & Tube Products BV Changes possible without prior notice 9

10 VKK Model indication Example : VKK VKK : liquid chiller fitted with internal fin tubes, diameter 16 mm 8 : shell diameter code 215 : Effective length in cm (nominal length) 1 : number of separate refrigerant circuits Application The type VKK liquid chillers are compactly built and suitable for direct evaporation of a H(C)FC refrigerant inside the tubes. The series comprises 22 models, which have a nominal capacity ranging from 55 up to 580 kw. The chillers are equipped with a distributor which facilitates optimal distribution of the refrigerant and baffle plates which ensure an intensive liquid flow. Pressure drop distributor approx. 1.5 bar Design The shell and tube plates are steel Tubes : copper tubes with an aluminium internal star section End covers : steel, equipped with a distributor, which is mounted in the refrigerator inlet Connections : refrigerant side has welding / soldering stubs Water side has flanges, according to DIN 2633 (no counter flanges) Water connections, each having one connection for a thermostat or thermometer. 2 connections on the shell for purge and drainage The liquid chillers are fitted with supports A TÜV test certificate is available, with the exception of the VKK 7 model All coolers are pressure tested, vacuumed and fitted with a dry nitrogen protective filling Cooling capacity The nominal cooling capacity given is based on water from 12 to 7 C, refrigerant R22 and an evaporation temperature of 2 C. Superheating maximum 5 K. Capacities of other refrigerants on request. Operating conditions Operating Operating temperature pressure max. min. max. C C bar Refr. side * 16.5 Liquid side * 10 * Freezing protection equipment to be provided by client Application beyond above values possible on request only. Refrigerant side pressure Water side pressure 22 bar 13 bar Helpman Shell & Tube Products BV Changes possible without prior notice 10

11 VKK Technical Data Type Afmetingen Nominal Water Volume Weight capacity flow E N S T refrig- water VKK erant A C d D kw m 3 /h mm NW mm mm dm 3 dm 3 kg /33 42/ x 28/33 2 x 28/ /42 42/ x 28/33 2 x 35/ /42 54/ x 28/33 2 x 42/ /42 54/ x 28/33 2 x 42/ /42 67/ x 35/42 2 x 42/ /42 67/ x 35/42 2 x 42/ /42 67/ x 35/42 2 x 54/ /42 67/ x 35/42 2 x 54/ /48 80/ x 35/42 2 x 67/ /60 80/ x 35/42 2 x 67/ x 35/42 2 x 67/ x 34/42 2 x 67/ A( ) max = C = E S d T D N L nom Helpman Shell & Tube Products BV Changes possible without prior notice 11

12 VK Model indication Example : VK S - * - ** VK Liquid cooler with plain tubes, ø19 mm 14 Shell diameter code 250 Effective length of the tubes in cm (nominal length) S Code for baffle spacing * Number of refrigerant passes ** Number of circuits General information The liquid chiller is suitable for all halocarbon refrigerants and ammonia, duty range 25 up to 700 kw with a cooling surface of 2 up to 100 m 2. The liquid coolers are fitted with supports. The most important areas of application are cooling of water, water glycol mixtures and brine. An appropriate offer can be made for these and many other liquids on request. Intensive research and testing supported by a computer model has produced a series of 72 basic models with 12 shell diameters and 6 standard lengths. Varying the number of refrigerant passes gives the possibility to select the most efficient type VK for a given application. The VK is available with two different baffle plate spacings. Operation Direct expansion of the refrigerant provides a liquid-gas mixture in the cooler. This refrigerant passes through the tubes. For every application the most efficient distribution of the refrigerant per tube and per pass has been calculated. The water-glycol flow is guided through the shell by means of baffle plates. Helpman Shell & Tube Products BV Changes possible without prior notice 12

13 VK Design Shell Seamless steel tube : St 35.8 according to DIN For VK 14, 16, 18, 20, 22 and 24 : plate material P265GH to EN Shell side is equipped with a drain and purge connection. Tube plates / Tubes Tubeplate: P265 GH to EN Tubes St 35.8 to DIN The holes in the tube plate are double grooved to give a better resistance against thermal tension. The tubes are rolled into the tubeplate. End covers & Gaskets Covers: P265 GH acc. to EN Bolts: 8.8 acording to DIN 267 Gaskets Neoprene composite material to Helpman specifications. The covers are machined from solid steel plate material and are grooved to have a confined gasket. Baffle plate assembly Baffle plates : St 37-2 to DIN Support rods : St 37-2 to DIN Depending on type of cooler there are 2 baffle spacings available (S and T). Baffle plate set is fixed by support rods. Refrigerant connections Connection St 37.0 according to DIN 2448/1629/3 executed as welding/soldering stub, blanked off with a welded disc. Liquid connections Stubs St 37.0 with flange R.St 37.2 to DIN Each connection is provided with a 1/2" BSP female pocket. Counter flanges available on request. Insulation / heating The length of all protruding parts is such that insulation and heating can be applied under normal circumstances. Insulation and heating are available on request. Finish The refrigerant side is dehydrated and filled with a protective charge. The shell is internally shot blasted and protected by a phosphate treatment. The shell external is shot blasted to quality SA 2 1/2 and finished with a primer layer. Operating conditions Operating Operating temperature pressure max. min. max. C C bar Refr. side * 16.5 Liquid side * 10 * Freezing protection equipment to be provided by client. Application beyond above values possible on request only. Construction codes Materials and stress calculation meet the requirements of AD Merkblätter (FRG Rules) The construction of the VK coolers can be accepted by following inspection authorities : Stoomwezen Lloyd s R.o.S. T.Ü.V. Bureau Veritas A.B.o.S. Germanischer Lloyd DNV As per inspection authority certain details may require adaptation, prices are given on request only. Helpman Shell & Tube Products BV Changes possible without prior notice 13

14 VK Quality control Strength For all standard VK coolers, strength calculations have been made according to AD-Merkblätter. Strength calculations in accordance with the rules of other inspection authorities can be supplied on request. The standard VK coolers are pressure tested at : 13 bar shell side 22 bar tube side Leaktest The standard coolers are submitted to following leaktest : Tube/tubeplate connection : Pneumatic test on shell side at 13 bar during 24 hours, tested while unit is submerged under water. Cover/gasket/tubeplate : Pneumatic test on tube side at 22 bar while unit is submerged under water.. Other test procedures on request. Dehydration The standard liquid cooler is blown through with dry compressed air and dehydrated be evacuation. The vacuum-dryness test is based on a stable pressure of 10 mbar maintained for 30 minutes. Quality assurance Quality assurance is based on ISO Dimensions of the standard coolers are in accordance with the tolerance class of DIN E. Factory certificate and production report are available on request at an extra cost. Duties Water Selected Duty Pressure drop Tube flow type water side surface m 3 /h VK kw kpa m S-6P S-6P S-6P S-6P S-6P S-6P S-6P S-6P S-6P S-6P Duties Due to the great diversity in liquids to be cooled, it is not possible to list the duties in a table. In order to give an indication, values have been given in the above table which correspond to the following applications: Water inlet temperature +12 C Water outlet temperature + 7 C Evaporating temperature + 2 C Refr. liquid temperature +30 C Refrigerant R 22 Fouling factor 0.86 x 10-4 m 2 K/W Refrigerant superheating of 60 % of the difference between the water inlet temperature and the evaporating temperature (DT 1 ) has been taken into account. An optimal cooler selection is obtained by means of a computer program. Helpman Shell & Tube Products BV Changes possible without prior notice 14

15 VK Technical Data Type Nominal length in cm (L nom ) VK Tube surface * Number of tubes Max. allowable ** waterflow Int. vol. (refr. side) Int. vol. (water side) Weight excl. feet Int. vol. (refr. side) Int. vol. (water side) Weight excl. feet Int. vol. (refr. side) Int. vol. (water side) Weight excl. feet Int. vol. (refr. side) Int. vol. (water side) Weight excl. feet Int. vol. (refr. side) Int. vol. (water side) Weight excl. feet Int. vol. (refr. side) Int. vol. (water side) Weight excl. feet m 2 /m m 3 /h dm 3 dm 3 kg dm 3 dm 3 kg dm 3 dm 3 kg dm 3 dm 3 kg S T S T S T S T S T S T S T S T S T S T S T S T dm 3 dm 3 kg dm 3 dm 3 kg * External tube surface per meter nominal cooler length. ** These values not to be exceeded in view of allowable water velocities. Helpman Shell & Tube Products BV Changes possible without prior notice 15

16 VK Dimensions Type L nom. = nominal length in cm VK C B A max C B A max C B A max C B A max S/T S/T S/T S/T S/T S/T S/T S/T S/T S T S T S T C B A max C B A max Helpman Shell & Tube Products BV Changes possible without prior notice 16

17 VK Dimensions mm Type Dimensions Water- VK F G D d E H H 2 conn. N S NW T NW S NW T NW S NW T NW S NW T NW S NW T NW S NW T NW S NW T NW S NW T NW S NW T NW S NW T NW S NW T NW S NW T NW 250 A (max) = C = E H d D N H2 Go = B = L nom F 30 Helpman Shell & Tube Products BV Changes possible without prior notice 17

18 VKBN Model indication example : VKBN Pass VKBN : cooler type 16 : nominal diameter of the shell in inches 335 : nominal length 2 : number of passes Application VKBN liquid coolers are used in industrial refrigeration plants and heat pumps and are especially suitable in situations where the liquid side of the heat exchanger needs to be cleanable. The range includes a large number of types with cooling surfaces from 1.6 up to 88 m 2. The refrigerant evaporates on the shell side and the cooling liquid flows through the tubes. The suction separator on top of the shell has a special construction that gives a optimized separation of the remaining liquid from the gasstream. The liquid coolers are suitable for halocarbon refrigerants and ammonia and can be used for water and various types of brine. The coolers can be used as well for positive as for negative temperature levels. Design Shell and tube plates steel. Tubes steel, 19 mm O.D. Covers cast iron, cast iron plastified or bronze, 2 or 4 passes, flanges to DIN Return cover with purge and drain connection. Standard accessories 2 connections for level indicator. 1 purge connection. All coolers are available on request with : materials addapted for low temperature application coating on the tube side for aggressive cooling liquids non standard length and diameter. Test pressure Refrigerant side 22 bar Liquid side VKBN bar VKBN bar Required data for inquiries and orders. 1 type of cooling liquid and flow 2 liquid in- and outlet temperature 3 refrigerant 4 evaporating temperature 5 refrigerant temperature before cooler 6 size of refrigerant connections 7 required optional extras 8 test certificates Operating conditions Operating Operating temperature pressure max. min. max. C C bar Refr. side * 16.5 Liquid side VKBN * 4 VKBN * 2 * Freezing protection equipment to be provided by client Application beyond above values possible on request only Helpman Shell & Tube Products BV Changes possible without prior notice 18

19 VKBN Duties Water Selected Duty Pressure drop Tube flow type water side surface m 3 /h VKBN kw kpa m P P P P P P P P P P P P Waterflow max. m 3 /h Type 2 pass 4 pass VKBN Nominal duty Due to a great diversity in liquids to be cooled, it is not possible to list the duties in a table. In order to give an indication, values have been given in the above table corresponding to the following applications : Water inlet temperature : +12 C Water outlet temperature : + 7 C Evaporating temperature : + 2 C Refrigerant : NH 3 Fouling factor : 0.86 x 10-4 m 2 K/W Technical Data Type Number Effective * Empty weight Max. refrig. Liquid volume of cooling surface volume (tube side) VKBN tubes m 2 kg dm 3 dm 3 L nom. cm L nom. cm L nom. cm L nom. cm * Total surface is larger, the surplus is above refrigerant level. When calculating the operating weight it should be noted that the refrigerant charge is not 100 % liquidized but partially present as vapour. Helpman Shell & Tube Products BV Changes possible without prior notice 19

20 VKBN 50 2-Pass og Z d 50 E F C D d V E F A L nom B 4-Pass Dimensions in mm Type 2 Passes 4 Passes VKBN d D V** A B E F A B E F C ** V = Liquid level at full load. Dimensions of separator Suction connection ø G mm Separator ø d mm Dimension Z mm Weight kg L = L = L = Helpman Shell & Tube Products BV Changes possible without prior notice 20

21 VKBN 150 V 150 O N T K 30 A Z B F R H = 0.6 L nom. = 30 W 30 V Connection for safety valve ø 26.9 T 220 Thermometer pocket 2" BSP K Valve on return cover (Econosto 3" or d") A 30 Drain valve on shell side with TAH-8 F Counter flanges on connection cover (DIN 2631) O 150 Purge connection on shell : ø 21.3 S 30 R H W 30 Dimensions in mm Mounting feet X 30 40* Y 45 60* Z M K Liquid pot with drain valve TAH-8 B - Wooden blocks N - Level pipe P - Coating tube side VKBN W H H* R K M * with liquid pot Above accessories available at extra price (see price list). Helpman Shell & Tube Products BV Changes possible without prior notice 21

22 VKN Model indication Example : VKN Pass VKN : Liquid chiller fitted with plain steel tubes ø25 mm 36 : Shell diameter code 500 : Heat exchange length of the tubes in cm (nominal length) 4 : Number of passes General information The VKN liquid chiller is applied in industrial cooling installations and heat pump systems, in those cases where the liquid side needs to be cleanable. The liquid chiller is built up of a heat exchange section and an attached separator. The refrigerant evaporates on the shell side and the cooling liquid flows through the tubes. The liquid coolers are suitable for halocarbon refrigerants and ammonia The separator is dimensioned in such a way that drops of liquid are separated from the gas flow. The separator has a special internal construction for this purpose. The liquid chiller is suitable for cooling liquids such as water, brine etc. Design Shell of cooler/separator Up to 18" diameter : Seamless steel tube St " and 24" diameter: Welded steel tube API STD 5L Grade 13 28" diameter and larger: Welded steel tube of plate material P265 GH to EN Tubes Seamless steel tube 25 x 2 mm St 35.8 according to DIN End covers Steel Designed with 2, 4, 6 or 8 passes Plate material P265GH according to EN ST 37-2 according to DIN Flanges according to DIN Special designs VKN chillers are also available : with adapted materials for application at low temperatures or for use with aggressive liquids coating on water side. Operating Conditions Operating Operating temperature pressure max. min. max. C C bar refr. side waterside * 4 * Freezing protection equipment to be provided by client. Application beyond above mentioned values on request only. Helpman Shell & Tube Products BV Changes possible without prior notice 22

23 VKN Duties Water Selected Duty Pressure drop Tube flow type water side surface m 3 /h VKN kw kpa m P P P P P P P Waterflow max. m 3 /h Type 2 pass 4 pass 6 pass 8 pass VKN Nominal duty Due to a great diversity in liquids to be cooled, it is not possible to list the duties in a table. In order to give an indication, values have been given in the above table corresponding to the following applications : water inlet temperature +12 C water outlet temperature + 7 C evaporating temperature + 2 C refrigerant NH 3 fouling factor 0.86 x 10-4 m 2 K/W based on liquid level V (see table on page 25). Calculation programmes for use with other refrigerants and liquids are available on request. Technical data Type VKN Number of tubes L nom cm Effective* m cooling surface (Empty) weight kg Maximum** dm liquid volume Volume waterside dm * The total external tube surface is larger. A number of tubes is located above liquid level to assist in liquid separation ** Maximum refrigerant filling based on liquid level V (see next page) When determining operational weight it should be considered that the refrigerant is not 100 % in liquid phase. Helpman Shell & Tube Products BV Changes possible without prior notice 23

24 VKN Regulations The standard construction is designed according to the materials and design given in the documentation. By adapting to the specific testing requirements, the liquid chiller can be approved by the following testing authorities and regulations : Stoomwezen Lloyd s R.o.S. T.Ü.V. Bureau Veritas A.B.o.S. Germanischer Lloyd DNV As per inspection authority certain details may require adaptation, prices are given on request only. Quality control Strength For all standard VKN coolers, strength calculations have been made according to AD-Merkblätter. Strength calculations in accordance with the rules of the other inspection authorities mentioned on this page can be supplied on request. The standard coolers are pressure tested at : refrigerant side 22 bar cooling liquid side 5 bar Leaktest The standard coolers are submitted to the following leaktest : Tube / tubeplate connection : Pneumatic test on shell side at 22 bar during 24 hours, tested while unit is submerged under water Cover/gasket/tubeplate : Pneumatic test on tube side at 5bar. Other test procedures on request. Dehydration The standard liquid cooler is blown through with dry compressed air and dehydrated be evacuation. The vacuum dryness test is based on a stable pressure of 10 mbar maintained for 30 minutes Quality assurance Quality assurance is based on ISO Dimensions of the standard coolers are in accordance with the tolerance class of DIN E. Factory certificate and production report are available on request at an extra cost. Helpman Shell & Tube Products BV Changes possible without prior notice 24

25 VKN A L nom mm o S B T 50 H d D E F U V = 0.6 x L nom. = 50 W 50 Dimensions liquid cooler (mm) Type Number of passes VKN A B d D V * W H E F E F E F E F Dimensions separator (mm) ø suction S ø separator T U Weight in kg L = * V = Liquid level at full load. Helpman Shell & Tube Products BV Changes possible without prior notice 25

26 VKN 150 V 150 O N T K 30 A Z 275 B F o 324 Accessories The liquid chillers can be supplied with various accessories These accessories can be denoted by means of a letter code. V K F Connection for savety valve ø26.9mm (tapering from ø 42.2 mm) Valves on end-cover ( Saunders ) Steel welding flanges for liquid connections according to DIN 2633 N Level pipe T Thermometer pocket with ½" BSP internal connection A Drain valve on shell side with TAH-8 O Z B P S Purge connection on the shell ø21.3mm Liquid pot with drain valve TAH-8 Hardwood blocks Coating tube side Supports Above accessories can be fitted at an extra price (see price list). Helpman Shell & Tube Products BV Changes possible without prior notice 26

27 Factory and Head Office Helpman Shell & Tube Products BV PO Box 44 NL 9700 AA Groningen Peizerweg 97 NL 9727 AJ Groningen Netherlands telephone telefax Internet www. helpman.nl Nederland Aircool BV Postbus 4100 NL GG Ridderkerk tel fax aircool@luna.nl Nederland Hagros BV Postbus 29 NL AA Hoensbroek tel fax Bulgaria Helpman Sofia EOOD 89, Tzar Boris III Bld Sofia Ireland HRP Wholesale. 100, Slaney Road Dublin, Industrial Estate, Finglas, Dublin 11 tel fax België Molimex-Refrigeration NV Vierwinden 6 B Zaventem tel fax Deutschland Schick/Emzet GmbH Postfach D Stuttgart Hungary Soós & Co. Ltd. P.O. Box 94 H-1631 Budapest Cziráki út 5-7 tel fax Greece Tria Trita LTD 96, Minoas Street Megara tel fax Romania Midal Group SRL 111A Pantelimon Road Bucharest tel fax tel fax tel fax United Kingdom Danmark Czechia APS Ltd. Meliorate House 98 Main Street, Yaxley Peterborough, PE7 3LP Air-Con Danmark A/S A. Knudsen Vej 15 DK Ebeltoft CHTP Engineering s.r.o. Nademlejnska 600 CZ Prague, CR tel fax c.curtis@virgin.net tel fax aircon@post2.tele.dk tel fax strojobal@praha.czcom.cz United Kingdom Danmark Poland HRP Wholesale 8, Alanbrooke Park Belfast, BT6 9EG Air-Con Danmark A/S Korsdabvej 113 DK Rødovre Pol-Stowest Spótka z.o.o. Ul. Krzemieniecka Wroclaw tel fax tel fax tel fax Norge Israel Schløsser Møller Kulde A/S Postboks 65, Bryn 0611 Oslo-6 Eres Refr. & Engin. Ltd. 18, Hamelacha Street Haifa tel fax tel fax