Gas ejector for single-stage liquid ring vacuum pumps
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1 Gas ejector for single-stage liquid ring vacuum pumps GEV GEV 1800 Operating pressure: Suction volume flow: 8 to 80 mbar 5 to 1050 m³/h CONSTRUCTION TYPE Sterling SIHI gas ejectors are simple and sturdy vacuum gas ejectors w ith follow ing particular characteristics: Adaptable to different operating conditions by adequate material selection Simple installation into the suction line of liquid ring vacuum pumps Low noise service w hich is free of maintenance and deficient in vibration GEV LEM 150 NOTE APPLICATION Sterling SIHI gas ejectors extend the operating range of Sterling SIHI liquid ring vacuum pumps so that lower absolute pressures become possible (to 8 mbar). Field of application are e.g.: Chemistry and pharmacy for distilling and degassing Electric industry for impregnation and drying Plastics industry for degassing etc. The gases which are to be handled may be vapour saturated or aggressive. Sterling SIHI gas ejectors are used w herever the vacuum attainable by a liquid ring vacuum pump is not sufficient and w here danger of running in cavitation is immenent for the liquid ring vacuum pump. Even if the suction side of the ejector is closed, the liquid ring vacuum pump is protected against cavitation. The characteristics of the suction volume flow of the gas ejectors depend on essentially on the suction capacity of the liquid ring vacuum pump and therefore on the vapour pressure ant temperature of the service liquid used. To meet w ith the different conditions, w e offer 2 construction series. Type: A B Service liquid: water to 15 C water to 30 C Suction pressure: mbar mbar POLLUTION CONTROLL: To reduce the exhaust blast the motive gas can be removed from the separator. The standard combinations described in this catalogue list are optimal in view of suction volume flow, pow er absorption and service charges. Other combinations of gas ejectors and liquid ring vacuum pumps can be applied. Details on request. VACUUM TECHNOLOGY GPV G E 05/2015
2 Material design GEV 25 and GEV 50 GEV 90...GEV 150 GEV GEV 425 GEV GEV 450 Item COMPONENTS 0S 4F 0R 0B 4B 0A 4B 0970 Motive nozzle Venturi tube hard rubber Casing EP-resin glass-fibre reinforced Venturi tube holder not available 0969 Insert ring not available not available GEV GEV 1800 GEV 91...GEV 161 Item COMPONENTS 0A 4B Item COMPONENTS 0A 4B 0970 Motive nozzle Motive nozzle Venturi tube Venturi tube 0951 Casing Casing Venturi tube holder In case of the material design 4B the venturi tube holder is not in contact with the medium handled. Sectional drawing GEV 25 + GEV 50 GEV GEV 161 GEV GEV
3 Technical Data Suction pressure range 8 to 40 mbar type A, E service liquid temperature up to 15 C Suction pressure range 20 to 80 mbar type B, F service liquid temperature up to 30 C gas ejector + liquid ring vacuum pump rated power of the pressure at a suction make-up water flow for pump motor of the liquid volume flow = zero difference in temperature speed ring vacuum pump mbar mbar m³/h rpm kw type A type B 2 C 5 C GEV 25 + LEM 25 / LEM * GEV 50 + LEM 50 / LEM GEV 91 + LEM/L GEV LEM/L 126 AZ/AB GEV LEM/L 161 8Z/8B GEV 90 + LEM/L GEV 90 + LEM/L 126 CZ/CB 2900 GEV LEM/L 125 GEV LEM/L GEV LEM/L 161 9Z/9B 1460 GEV LEM/L GEV LEM GEV LEM GEV LEH GEV LEH GEV LEH GEV LEH GEV LEH GEV LEH GEV LEH GEV LEH * The gas ejectors GEV 25 and GEV 50 only are available as type A. At a service water temperature of 30 C and suction volume flow zero a pressure of 17 mbar is reached. The make-up liquid flow is indicated for combined operation. The service liquid is 2 C resp. 5 C warmer than the make-up water. Data for make-up water operation, see operation instructions for liquid ring vacuum pumps. The values indicated for the suction volume flow are applicable for the compression of dry air of 20 C from suction pressure to atmospheric pressure (1013 mbar). As service liquid for the liquid ring vacuum pump is used water of 15 C resp. 30 C. The motive air for the gas ejector has a pressure of abt mbar. Motive and pumping gases with physical properties differing from those of air, service water with temperatures different from those indicated, as well as service liquids other than water, cause a change of the suction capacity which can be determined by Sterling SIHI on request. 3
4 Performance graph of the combinations Suction pressure range: 8 to 40 mbar for service liquid temperatures up to 15 C GEV 425A+LEM GEV 250A+LEM/L GEV 325A+LEM GEV 150A+LEM/L or LEM/L GEV 125A+LEM/L GEV 90A+LEM/L 90 2 or LEM/L 126 C 1 GEV 50A+LEM 50/51 1 GEV 25A+LEM 25/ speed: 2800 rpm 2 speed: 1450 rpm GEV 161A+LEM GEV 126A+LEM GEV 91A/E+LEM speed: 2900 rpm 2 speed: 1460 rpm If a combination gas ejector - liquid ring vacuum pump is applied in the range from 40 mbar to 1013 mbar, the motive gas flow can be shut off. Then the suction volume flow of the combination increases by abt. 15 %. For the suction volume flow the tolerance is 10 %. 4
5 Performance graph of the combinations Suction pressure range: 8 to 40 mbar for service liquid temperatures up to 15 C 1 GEV 1800A+LEH GEV 1500A+LEH GEV 1200A+LEH GEV 900A+LEH GEV 800A+LEH GEV 600A+LEH speed: 1450 rpm 2 speed: 1460 rpm 3 speed: 975 rpm GEV 450A+LEH GEV 350A+ LEH If a combination gas ejector - liquid ring vacuum pump is applied in the range from 40 mbar to 1013 mbar, the motive gas flow can be shut off. Then the suction volume flow of the combination increases by abt. 15 %. For the suction volume flow the tolerance is 10 %. 5
6 Performance graph of the combinations Suction pressure range: 20 to 80 mbar for service liquid temperatures up to 30 C GEV 425B+LEM GEV 325A+LEM GEV 125B+LEM/L GEV 250B+LEM/L GEV 150B+LEM/L or LEM/L GEV 90B+LEM/L 90 2 or LEM/L 126 C 1 GEV 50A+LEM 50/51 1 GEV 25A+LEM 25/ speed: 2800 rpm 2 speed: 1450 rpm GEV 161B+LEM GEV 126B+LEM GEV 91B/F+LEM speed: 2900 rpm 2 speed: 1460 rpm If a combination gas ejector - liquid ring vacuum pump is applied in the range from 80 mbar to 1013 mbar, the motive gas flow can be shut off. Then the suction volume flow of the combination increases by abt. 15 %. For the suction volume flow the tolerance is 10 %. 6
7 Performance graph of the combinations Suction pressure range: 20 to 80 mbar for service liquid temperatures up to 30 C GEV 1800B+LEH GEV 1500B+LEH GEV 1200B+LEH GEV 900B+LEH GEV 800B+LEH GEV 600B+LEH GEV 450B+LEH GEV 350B+LEH speed: 1450 rpm 2 speed: 1460 rpm 3 speed: 975 rpm If a combination gas ejector - liquid ring vacuum pump is applied in the range from 80 mbar to 1013 mbar, the motive gas flow can be shut off. Then the suction volume flow of the combination increases by abt. 15 %. For the suction volume flow the tolerance is 10 %. 7
8 Dimensions GEV 25 + GEV 50 GEV 90 bis GEV 450 GEV 91 bis GEV 161 GEV 91 E + F GEV 600 bis GEV 1800 Flanschanschlussmaße N1 = gas-inlet, N2 = gas-outlet, TG = motive gas inlet series + weight in kg for material design type N1 N2 b d e w SW size 0R 0 0B 0 4B 0 0A 0 0S 0 4F 0 GEV 25 GEV 50 A G 1 G 1 25 G 1/ GEV 91 A, B G 1 1/4 G 1 1/4 55 GEV 126 A, B 33.5 G 1/ GEV 161 A, B G 1 1/2 G 1 1/ GEV 91 E, F 35 G 1/ GEV 90 A, B A GEV B A 354 GEV B 329 GEV 250 A, B GEV 325 A G 1/ B A GEV 425 B GEV 350 A,B A GEV 450 B GEV 600 A, B 846 GEV 800 A, B * GEV 900 A, B 866 GEV 1200 A, B GEV 1500 A B * GEV 1800 A B * Flange suitable for counter-flange according to DIN 2558 flange connections according to DIN 2501 PN 10 DIN 2558 PN 6 DN k D d2 x number 18 x 4 18 x 4 18 x 4 18 x 8 18 x 8 11 x 2 14 x 2 d s Example for ordering: G E V A 91 A 0A 0 series size type material design Any changes in the interest of the technical development are reserved. S t e r l i n g S I H I G m b H Lindenstraße 170, D Itzehoe, Germany, Telephone +49 (0) / , Fax +49 (0) /
Gas ejectors for two-stage liquid ring vacuum pumps
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