Condensate pumps Mechanical pumps and pumps traps
9
Local regulations may restrict the use of this product to below the conditions quoted. In the interests of development and improvement of the product, we reserve the right to change the specification without notice. © Copyright 1993
TI-P135-03 ST Issue 1
PPC and PPF Pressure Powered Pumps
How to select and size From the inlet pressure, back pressure and filling head conditions given below, select the pump size and check valve package which meets the capacity requirement of the application. Specify pump body, type PPC or PPF. Select optional extras as required. For liquid specific gravities from 0.9 to 0.65 consult Spirax Sarco.
Example :
Condensate Load
1640 kg/h 5.2 bar g
Steam pressure available for operating pump Vertical lift from pump to the return piping
9.2 m
Pressure in the return piping (piping friction negligible)
1.7 bar g
Filling head on the pump available
0.3 m
Selection : 1. Calculate ”H”, the total lift or back pressure, against which the condensate must be pumped (see page 3). = (9.2 x 0.0981) + 1.7 = 2.6 bar g. 2. From capacity table, with 5.2 bar g inlet pressure and 2.8 bar g back pressure, choose a size 1½ pump which has a capacity of 1725 kg/h. Note from capacity factor charts (on page 2) A. Pump capacity filling head is 0.6m: 1.2 x 1725 = 2070 kg/h B. Pump capacity using compressed air: 1.12 x 1725 = 1932 kg/h (% Back pressure/Motive pressure is 2.6 ÷ 5.2 = 50%)
Capacity kg/h When installed with recommended filling head above top of pump of 0.3m (& liquid specific gravity 0.8 - 1.0)
Operating Inlet Pressure bar g
Total Lift or Back Pressure* bar g
Capacity (kg/h) Pump Size
Operating Inlet Pressure bar g
Total Lift or Back Pressure* bar g
Capacity (kg/h) Pump Size
1
1½ 2
3 x 2
1
1½ 2
3 x 2
9.1 77
8.6 8.6 8.6 6.9 6.9 6.9 5.2 5.2 5.2
1.0 2.8 4.1 1.0 2.8 4.1 1.0 2.8 4.1
1180 2134 3042 5130 1090 2043 2860 4808 1044 1768 2724 4626 1180 2088 2996 5080 1090 1907 2769 4717 1000 1634 2633 4490 1135 1907 2996 5080 1090 1725 2633 4444 908 1544 2270 3855
3.4 3.4 3.4 1.7 1.7 1.7
0.69
1090 1816 2906 4900 1044 1680 2633 4444 908 1453 2179 3720 1044 1907 2769 4717 953 1771 2542 4553 908 1498 2315 3945 908 1498 2315 3945 817 1316 1861 3174 726 1226 1725 2811
1.7 2.8
0.34 0.69
1.0
0.69 0.69 0.34
0.14 0.34 0.14
* Back pressure is the lift height (H) in metres x 0.0981 plus pressure bar g in return line, plus downstream piping friction pressure drop in bar calculated at the lesser of six times the actual flow rate or 20,000 l/h. Capacities chart, Capacity multiplying Factors for other filling heads (table) and Capacity multiplying Factors for motive gas supplies (other than steam) (table) are on page 2
TI-P135-03 ST Issue 1
Page 1 of 4
PPC and PPF Pressure Powered Pumps
Powered by FlippingBook