Condensate pumps
Mechanical pumps and pumps traps
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.
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
Pump size
Flash steam
up to:
Pipe size
Diameter
Length
Vent line
Diameter
454 kg/h)
(1000 lb/h)
400 mm
(16")
1524 mm
(60")
150 mm
(6")
907 kg/h)
(2000 lb/h)
500 mm
(20")
1524 mm
(60")
200 mm
(8")
1361 kg/h)
(3000 lb/h)
600 mm
(24")
1524 mm
(60")
200 mm
(8")
1814 kg/h)
(4000 lb/h)
650 mm
(26’’)
1524 mm
(60")
250 mm
(10")
2268 kg/h)
(5000 lb/h)
700 mm
(28")
1524 mm
(60")
250 mm
(10")
2722 kg/h)
(6000 lb/h)
750 mm
(30")
1829 mm
(72")
300 mm
(12")
3175 kg/h)
(7000 lb/h)
800 mm
(32")
1829 mm
(72")
300 mm
(12")
3629 kg/h)
(8000 lb/h)
900 mm
(36")
1829 mm
(72")
350 mm
(14")
Liquid load
kg/h
(lb/h)
Reservoir pipe size*
300 mm
400 mm
500 mm 600 mm
(12")
(16")
(20")
(24")
4535 kg/h)
(10000 lb/h)
1524 mm
(5 ft)
914 mm
(3 ft)
610 mm
(2 ft)
9070 kg/h)
(20000 lb/h)
3048 mm
(10 ft)
2133 mm
(7 ft)
1219 mm
(4 ft)
13605 kg/h)
(30000 lb/h)
2743 mm
(9 ft)
1828 mm
(6 ft)
1219 mm
(4 ft)
18141 kg/h)
(40000 lb/h)
3658 mm
(12 ft)
2286 mm
(7.5 ft)
1828 mm
(6 ft)
22676 kg/h)
(50000 lb/h)
2743 mm
(9 ft)
1828 mm
(6 ft)
27211 kg/h
(60000 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.
Multiplying factors
for non-standard conditions
Capacity multiplying factors
for motive gas supply (other than steam)
% Back
pressure
v.
Motive
pressure
(bp / MP)
10%
20% 30% 40% 50%
60% 70% 80% 90%
Capacity
multiplying
factors
1.19
1.43 1.43 1.53 1.85
2.04 2.14 2.20 2.44
Filling head
mm inches
Capacity multiplying factors
for non-standard filling heads
-76 (-3") 0.23
-25 (-1") 0.41
0 (0) 0.70
152 (6") 0.89
305 (12") 0.95
457 (18") 0.98
610 (24") 1.00
914 (36") 1.00
1 219 (48") 1.08
1 524 (60") 1.20
TI-P135-13 ST Issue 2
PTF4 Pivotrol
®
Pump (patented) Dual Mechanism - Pressure Powered Pump
Page 5 of 8
6.1.34
