Steam traps Sealed
8
Pressure/temperature limits (ISO 6552)
Pressure psi g
0
145
305
435
580
725
32 212 392 572 752 842
Steam saturation curve
Pressure bar g
The product must not be used in this region. The product should not be used in this region or beyond its operating range as damage to the internals may occur.
Note: The model of pipeline connector and connections selected will dictate the maximum operating pressure and temperature of the complete assembly. Consult the specified Technical Information sheet as listed in 'Sizes and pipe connections' for relevant data.
Body design conditions
ASME 300
PMA Maximum allowable pressure
50 bar g @ 40 °C 725 psi g @ 104 °F
TMA Maximum allowable temperature
450 °C @ 29 bar g 842 °F @ 421 psi g
Minimum allowable temperature
-29 °C
-20.2 °F
PMO Maximum operating pressure for saturated steam service
21 bar g
305 psi g
TMO Maximum operating temperature
400 °C @ 21 bar g 752 °F @ 305 psi g
Minimum operating temperature *
0 °C
32 °F
PMX Maximum differential pressure
21 bar
305 psi
Designed for a maximum cold hydraulic test pressure of
75 bar g
1088 psi
* Traps are available in a range of subcooled temperature settings. Except for start-up and shutdown, they must operate above the minimum differential pressure values shown in the table below: Nominal subcooled temperature External identification Threshold differential pressure -10 °C -14 °F '-1' 5 bar 73 psi -30 °C -22 °F '-3' 2 bar 29 psi -50 °C -58 °F '-5' 0.5 bar 7.25 psi -70 °C -94 °F '-7' 0.1 bar 1.45 psi
8.8 22
TI-P625-04 CMGT Issue 4
Page 2 of 5
USM21 Sealed Bimetallic Steam Trap for use with Pipeline Connectors
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