Steam traps Balanced pressure
8
Pressure/temperature limits (ISO 6552)
Pressure psi g
0
72
145
217
290 304 360
32 212 392 572 752
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.
Body design conditions
PN25
PMA Maximum allowable pressure
25 bar g @ 300 °C 363 psi g @ 572 °F
TMA Maximum allowable temperature
400 °C @ 23 bar g
752 °F @ 334 psi g
Minimum allowable temperature
0 °C
32 °F
PMO Maximum operating pressure
21 bar g @ 235 °C 305 psi g @ 455 °F
TMO Maximum operating temperature
235 °C @ 21 bar g
455 °F @ 305 psi g
Minimum operating temperature
0 °C
32 °F
Designed for a maximum cold hydraulic test pressure of
38 bar g
551 psi g
Materials
No.
Part
Material
8.2 22
Austenitic stainless steel (303)
1
Body
ASTM A743 CF16Fa
2 3 4 5
Cap
Stainless steel
420A UGIMA AISI 420
6
Capsule
Stainless steel
4 3
Spring
Stainless steel
BS 2056 302 S26
Spacer plate
Stainless steel
BS 1449 304 S15
Strainer screen (0.8mm perforations)
6
Stainless steel
ASTM A240 316L
5
1
7
Gasket
Stainless steel
BS 1449 304 S15
7
Note : Material grades shown in brackets are nearest equivalents.
2
TI-P125-08 CMGT Issue 11
Page 2 of 4
MST21 Stainless Steel Balanced Pressure Thermostatic Steam Trap
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