Steam traps Bimetallic
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Capacities
E type pilot valve (>3 to 21 bar g)
(0 to 3 bar g) N type pilot valve
Differential pressure bar (x 100 = kPa)
Hot water capacity
Cold water capacity
How to size the SP80 and SP100 Both the SP80 and SP100 bimetallic steam traps are available with 2 different pilot valve assemblies (N type) or (E type) and 4 different seat types to achieve the rated capacities. To work out the appropriate bimetallic pilot valve and seat size for your application, follow the sizing procedure listed below: 1. The trap inlet pressure must be known: If the inlet pressure is below 3 bar g then select an N type pilot valve. If the inlet pressure is above 3 bar g then select an E type pilot valve. 2. The outlet pressure must be known to determine the differential pressure across the trap. 3. Depending on the desired capacity and differential pressure required, use the capacity chart above to choose the seat diameter which is closest to the seat’s mid range capacity.
Sizing example: 1. If the trap inlet pressure is 10 bar g - select E type pilot valve.
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2. If the outlet pressure is 6 bar g then: 10 bar g (inlet pressure) - 6 bar g (outlet pressure) means 4 bar g differential pressure exists. 3. If the trap is required to drain 25 000 kg / h then select either an SP80E or SP100E with a 46 mm seat, as this is closest to the mid- range capacity for a 46 mm seat. Although the capacity is also within the lower range of a 54 mm seat, trap performance would not be optimised.
TI-P624-02 CMGT Issue 7
Page 5 of 7
SP80 and SP100 Bimetallic Steam Traps
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