Vacuum Systems

A single ejector element is limited at the sometime by the ratio between discharge and suction pressure (dependent from the motive steam pressure and the back pressure) and the maximum load capacity.

 

Ejectors are utilized in series or in parallel, with or without intermediate condensers, to operate in a very large range of conditions and at lower absolute suction pressures than a single stageunit.

 

The figure below suggests a few of the many type of ejector arrangements that are used in industry.

vacuum systems stage ejectros scheme

1 Single stage ejector

2 3 stage ejector with intercondenser between 2nd and 3rd stage

3 3 stage ejector system with intercondensers (3rd stage to the atmosphere)

4 2 stage ejector system with intercondensers (2nd stage to the atmosphere)

5 4 stages ejector system (1st stage of non condensing type)

6 2 stages ejector system (non condensing type)

7 5 stages ejector system (1st and 2nd stages of non condensing type)

 

AB Progetti vacuum systems are installed for several years on various types of applications: refining plant, power plants and energy plants environmentally correct, cogeneration plant, desalination or water-power plants (MSF and MED), chemical industries (urea, ammonia, fertilizers production), shipbuilding industries.

Two stages vacuum system for desalination plant (production:16 Million Gallons) with start-up ejector.<br />Condensers materials: shell ASTM A 240 TP 317 L, tubes ASTM B 338 GR. 2, tubesheets ASTM B 171 C 715000, water boxes ASTM A 240 TP 317 L.<br />Ejector body material: ASTM A 240 TP 904 L<br />Start-up ejector body material ASTM A 240 TP 316 L<br />Location: Saudi Arabia
Two stages vacuum system for desalination plant (production:16 Million Gallons).<br />Assembly of Precondenser<br />Materials: shell ASTM A 240 TP 317 L, tubes ASTM B 338 GR. 2, tubesheets ASTM B 171 C 715000, water boxes ASTM A 240 TP 317 L.<br />Location: Saudi Arabia
Two stages vacuum system for desalination plant (production:18 Million Gallons) with start-up ejector.<br />Condensers materials: shell ASTM A 240 UNS31803, tubes ASTM B 338 GR. 2, tubesheets ASTM B 171 C 715000, water boxes ASTM A 240 UNS31803.<br />Ejector body material: UNS S31803<br />Start-up ejector body material UNS 2304<br />Location: UAE
Two stages vacuum system for desalination plant (production:18 Million Gallons) with start-up ejector.<br />Condensers materials: shell ASTM A 240 UNS31803, tubes ASTM B 338 GR. 2, tubesheets ASTM B 171 C 715000, water boxes ASTM A 240 UNS31803.<br />Ejector body material: UNS S31803<br />Start-up ejector body material UNS 2304<br />Location: UAE
Three stages vacuum system for desalination plant (production:14 Million Gallons) with start-up ejector.<br />Condensers materials: shell ASTM A 240 UNS NO 8904, tubes ASTM B 338 GR. 2, tubesheets ASTM B 171 C 63000, water boxes ASTM A 240 UNS NO 8904.<br />Ejector body material: ASTM A240 NO 8904<br />Start-up ejector body material ASTM A240 NO 8904<br />Location: UAE
Two stages vacuum system for petrochemical plant with start-up ejector.<br />Materials: shell ASTM A 106 GR. B, tubes SB 111  C715, tubesheets ASTM SA 266M Cl. 2, water boxes ASTM A 106 GR. B<br />Ejector body material: SA 105<br />Location: Texas (USA)
Separator with pumps of two stages vacuum system for refinery with seal liquid cooler, seal liquid separator, Ejector effluent separator, LRP (Precondenser weight 27000 Kg).<br />Condensers materials: shell A 516 Gr 60 , tubes A 179, tubesheets ASTM A 350 LF2 Cl.1 , water boxes A 516 Gr 60<br />Ejector body material: SA 516 Gr. 60 /SA 333 Gr.6/ SA 350 LF2 Cl.1<br />Pump Material : AISI 316L, SAF  2205<br />Separators material: SA 516 Gr 60<br />Cooler materials: shell A 516 Gr 60 , tubes A 179, tubesheets ASTM A 350 LF2 Cl.1 , water boxes A 516 Gr 60<br />Location: Portugal
Preconser of two stages vacuum system for refinery with seal liquid cooler, seal liquid separator, Ejector effluent separator, LRP (Precondenser weight 27000 Kg).<br />Condensers materials: shell A 516 Gr 60 , tubes A 179, tubesheets ASTM A 350 LF2 Cl.1 , water boxes A 516 Gr 60<br />Ejector body material: SA 516 Gr. 60 /SA 333 Gr.6/ SA 350 LF2 Cl.1<br />Pump Material : AISI 316L, SAF  2205<br />Separators material: SA 516 Gr 60<br />Cooler materials: shell A 516 Gr 60 , tubes A 179, tubesheets ASTM A 350 LF2 Cl.1 , water boxes A 516 Gr 60<br />Location: Portugal
Interconser of two stages vacuum system for refinery with seal liquid cooler, seal liquid separator, Ejector effluent separator, LRP (Precondenser weight 27000 Kg).<br />Condensers materials: shell A 516 Gr 60 , tubes A 179, tubesheets ASTM A 350 LF2 Cl.1 , water boxes A 516 Gr 60<br />Ejector body material: SA 516 Gr. 60 /SA 333 Gr.6/ SA 350 LF2 Cl.1<br />Pump Material : AISI 316L, SAF  2205<br />Separators material: SA 516 Gr 60<br />Cooler materials: shell A 516 Gr 60 , tubes A 179, tubesheets ASTM A 350 LF2 Cl.1 , water boxes A 516 Gr 60<br />Location: Portugal
Three stages vacuum system for desalination plant (production:14 Million Gallons) with start-up ejector.<br />Condensers materials: shell ASTM A 240 UNS NO 8904, tubes ASTM B 338 GR. 2, tubesheets ASTM B 171 C 63000, water boxes ASTM A 240 UNS NO 8904.<br />Ejector body material: ASTM A240 NO 8904<br />Start-up ejector body material ASTM A240 NO 8904<br />Location: UAE
Two stages vacuum system (joint water box type) for refinery with start-up ejector.<br />Condenser materials: shell ASTM A 106 Gr.B, tubes ASTM SA 179, tubesheets ASTM A 105, water boxes ASTM A 106 Gr.B.<br />Ejector body material: ASTM A 105<br />Location: Qatar
Two ejector stage, one condenser stage vacuum system (BEU type) for petrochemical plant.<br />Condenser materials: shell ASTM A 106 Gr.B, tubes ASTM SA 179, tubesheets ASTM A 105, water boxes ASTM A 106 Gr.B.<br />Ejector body material: ASTM A 105<br />Location: Qatar
Two stages vacuum system for desalination plant with start-up ejector.<br />Condensers materials: shell UNS 8904, tubes ASTM B 338 GR. 2, tubesheets BS 2875 CA 105, water boxes UNS 8904.<br />Ejector body material: ASTM A240 TP317L<br />Start-up ejector body material ASTM A240 TP317L<br />Location: UAE
Two stages vacuum system for refinery with start-up ejector.<br />Materials: shell ASTM A 106 GR B, tubes ASTM A 249 TP 304L<br />, tubesheets ASTM A 105, water boxes ASTM A 106 GR B<br />Ejector body material: ASTM A 105<br />Start-up ejector body material ASTM A 105<br />Location: Greece
Two stages vacuum system for desalination plant with start-up ejector.<br />Condensers materials: shell ASTM A 240 TP 316 L, tubes ASTM B 338 GR. 2, tubesheets ASTM B 171 C 706000, water boxes ASTM A 240 TP 316 L.<br />Ejector body material: UNS N0 8020<br />Start-up ejector body material UNS N0 8020<br />Location: Saudi Arabia
Two stages vacuum system (joint water box type) for cogeneration plant with start-up ejector.<br />Materials: shell A 240 Tp 316 L, tubes ASTM A 249 Tp 316 L, tubesheets A 240 Tp 316 L, water boxes ASTM A 516 - 60<br />Ejector body material: A 105<br />Start-up ejector body material A 105<br />Location: United Kingdom
Two stages vacuum system for refinery with start-up ejector.<br />Materials: shell UNS NO 8904, tubes ASTM B 338 GR. 2, tubesheets UNS NO 8904, water boxes UNS NO 8904<br />Ejector body material: AISI 316L<br />Start-up ejector body material ASTM A240 AISI 316L<br />Location: Greece
Two stages vacuum system for desalination plant with start-up ejector (production:15 Million Gallons).<br />Materials: shell ASTM A 240 UNS NO 8904, tubes ASTM B 338 GR. 2, tubesheets ASTM B 171 C 715000, water boxes ASTM B 171 C70600<br />Ejector body material: ASTM A240 TP316L<br />Start-up ejector body material ASTM A240 TP316L<br />Location: Kuwait
Two stages vacuum system for petrochemical plant.<br />Materials: shell ASTM A 240 Tp 304 L, tubes ASTM A 249 Tp 304 L, tubesheets ASTM A 240 Tp 304 L, water boxes ASTM A 106 GR. B<br />Ejector body material: AISI 304L<br />Precondenser weight: 35000 Kg<br />Location: Italy
Two stages vacuum system for petrochemical plant with condensate drum.<br />Materials: shell A 387 Gr 5 Cl 2, tubes ASTM A 213 T 5, tubesheets ASTM A 182 F 5, water boxes A 516 Gr 70<br />Ejector body material: A 182 F 5<br />Drum material: A 516 Gr 70<br />Location: Italy