Pipeline ancillaries Sight glasses
10
Pressure/temperature limits
Pressure psi g
0
14.5
29
43.5
50.8
298
212
Steam saturation curve
122
32
Pressure bar g
The product must not be used in this region.
Body design conditions
PN3.6
PMA Maximum allowable pressure
3.5 bar g @ 148 °C
50.8 psi g @ 298 °F
TMA Maximum allowable temperature
148 °C @ 3.5 bar g
298 °F @ 50.8 psi g
Minimum allowable temperature
-10 °C
14 °F
PMO Maximum operating pressure
3.5 bar g @ 148 °C
50.8 psi g @ 298 °F
TMO Maximum operating temperature
148 °C @ 3.5 bar g
298 °F @ 50.8 psi g
Minimum operating temperature
0 °C
32 °F
Note: For lower operating temperatures consult Spirax Sarco Designed for a maximum cold hydraulic test pressure of
7 bar g
102 psi g
PTMX Maximum test pressure (steam service)
3.5 bar g
50.8 psi g
Kv values Size
7.8.7
For conversion: Cv (UK) = Kv x 0.963 Cv (US) = Kv x 1.156
½"
¾"
1"
Kv
2.6
2.81
4.59
10.8 8
TI-P022-01 CMGT Issue 10
Page 2 of 5
Sight Check (Combined Sight Glass and Check Valve)
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