Steam traps Ball float
8
Pressure/temperature limits
220 200 150 100 50 0
Steam saturation curve
0 2 4*
6 8 10 12 1416
Pressure bar g
The product must not be used in this region. Note: The trap is available with a choice of four orifice plates suitable for various capacities: FT12-A, B, C and D. Each orifice option has a maximum and minimum flowrate. See the capacity chart below.
Body design conditions
PN16
PMA Maximum allowable pressure
16 bar g
TMA Maximum allowable temperature
220 °C
PMO* Maximum operating pressure
4 bar g
TMO Maximum operating temperature
220 °C
Designed for a maximum cold hydraulic test pressure of
24 bar g
Capacities Minimum flow FT12-A - 44% of graph FT12-B - 55% of graph FT12-C - 62% of graph FT12-D - 68% of graph
5.5.3
How to select/size the trap The FT12 has a fixed orifice combined with a float mechanism. There is a minimum flowrate which must be present to ensure that the orifice does not waste steam. This minimum flow is indicated as a percentage flow of the maximum hot condensate flow as shown on the capacity graph. Example: Maximum condensate load from a process is 85 000 kg/h at 3 bar pressure differential. The minimum load is 57 000 kg/h. Whilst the B, C or D models will pass the maximum load the B model has a minimum flow at 49 000 kg/h where as the C and D models require a higher minimum load of 62 000 kg/h and 85 000 kg/h respectively. In this example an FT12-B would be selected as the minimum flowrate of the trap is 49 000 kg/h.
8.5 2
Orifice option
150 000
FT12-D FT12-C FT12-B FT12-A
100 000 80 000 70 000 60 000 50 000 40 000 30 000 90 000
Maximum load
Minimum load
20 000
10 000
0.2 0.3 0.5 0.7 1
0.07 0.1
2 3 4
Differential pressure bar (x 100 = kPa)
TI-P084-01 CMGT Issue 8
Page 2 of 4
FT12 Cast Iron Float/Orifice Trap for High Capacity Applications
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