Condensate pumps Mechanical pumps and pumps traps
9
Vented receiver (open system) To drain condensate from a single or multiple source an 'open system', a vented receiver should be installed in a horizontal plane above and ahead of the pump. Sufficient receiver volume is needed above the filling head level to accept the condensate reaching the receiver during the pump discharge stroke. More important, the receiver must be sized to allow sufficient area for complete flash steam separation from the condensate. The Table below displays the proper vented receiver sizing (per criteria set forth in the A.S.H.R.A.E. Handbook) based on the amount of flash steam present. If the receiver is sized as shown below, there will be sufficient volume for condensate storage and sufficient area for flash steam separation. The receiver can be a length of large diameter pipe or a tank. Pump size Flash steam up to: Pipe size Vent line Diameter Length Diameter 454 kg/h (1 000 lb/h) 400 mm (16") 1 524 mm (60") 150 mm (6") 907 kg/h (2 000 lb/h) 500 mm (20") 1 524 mm (60") 200 mm (8") 1 361 kg/h (3 000 lb/h) 600 mm (24") 1 524 mm (60") 200 mm (8") 1 814 kg/h (4 000 lb/h) 650 mm (26’’) 1 524 mm (60") 250 mm (10") 2 268 kg/h (5 000 lb/h) 700 mm (28") 1 524 mm (60") 250 mm (10") 2 722 kg/h (6 000 lb/h) 750 mm (30") 1 829 mm (72") 300 mm (12") 3 175 kg/h (7 000 lb/h) 800 mm (32") 1 829 mm (72") 300 mm (12") 3 629 kg/h (8 000 lb/h) 900 mm (36") 1 829 mm (72") 350 mm (14") Inlet reservoir piping (closed system) To drain condensate from a single piece of equipment in a 'closed system', a reservoir should be installed in a horizontal plane above and ahead of the pump. Sufficient reservoir volume is needed above the filling head level to accept the condensate reaching the reservoir during the pump discharge stroke. The Table below displays the minimum reservoir sizing, based on a condensate load, needed to prevent equipment flooding during the pump dischare stroke. The reservoir can be a length of large diameter pipe or a tank. Pump size
Liquid load
Reservoir pipe size*
kg/h (lb/h)
300 mm (12")
400 mm (16")
500 mm (20")
600 mm (24")
4 535 kg/h) (10 000 lb/h) 9 070 kg/h) (20 000 lb/h) 13 605 kg/h) (30 000 lb/h)
1524 mm (5 ft)
914 mm (3 ft)
610 mm (2 ft)
3048 mm (10 ft)
2133 mm (7 ft)
1219 mm (4 ft)
2743 mm (9 ft)
1828 mm (6 ft)
1219 mm (4 ft)
9.1 53
18 141 kg/h) (40 000 lb/h)
3658 mm (12 ft)
2286 mm (7.5 ft)
1828 mm (6 ft)
22 676 kg/h) (50 000 lb/h)
2743 mm (9 ft)
1828 mm (6 ft)
27 211 kg/h (60 000 lb/h)
2743 mm (9 ft)
1828 mm (6 ft)
* When the backpressure or motive pressure is less than 50%, these reservoir lengths can be reduced by half.
Page 7 of 12
TI-P135-13 CMGT Issue 5
PTF4 Pivotrol ® Pump (patented)
version Dual Mechanism - Pressure Powered Pump
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