Boiler house Bottom blowdown systems
2
BBV63 Pressure/temperature limits - ASME
Pressure psi g
A
N
Steam saturation curve
N
O
10
30
49.6
Pressure bar g
The product must not be used in this region. An extended cover is required for use in this region.
2.11 8
High temperature packing required for use in this region.
Notes: 1. Where the process fluid temperature is sub-zero and the ambient temperature is below +5 °C, the external moving parts of the valve and actuator must be heat traced to maintain normal operation. 2. When selecting a valve with a bellows scaled bonnet, the pressure/temperature limits of the bellows must be read in conjunction with the valve pressure/temperature limits shown in table below.
Body design conditions
ASME 300
PMA Maximum allowable pressure
49.6 bar g @ 38 °C
1 440 psi g @ 100 °F
PMO Maximum operating pressure TMA Maximum allowable temperature
538 °C @ 25.2 bar g 1000 °F @ 365 psi g
A - N - N ASME 300
Minimum allowable temperature
-29 °C
-20 °F
Standard packing PTFE chevron (P)
250 °C @ 33.4 bar g 482 °F @ 484 psi g
TMO Maximum operating temperature
High temperature packing (H)
538 °C @ 25.2 bar g 1000 °F @ 365 psi g
Minimum operating temperature
-29 °C
-20 °F
Design for a maximum cold hydraulic test pressure of:
75 bar g
1 087 psi g
Body design conditions
ASME 150
PMA Maximum allowable pressure
19 bar g @ 38 °C
275 psi g @ 100 °F
PMO Maximum operating pressure TMA Maximum allowable temperature
538 °C @ 1.4 bar g 1000 °F @ 20 psi g
A - O ASME 150
Minimum allowable temperature
-29 °C
-20 °F
Standard packing PTFE chevron (P)
250 °C @ 12.1 bar g 482 °F @ 175 psi g
TMO Maximum operating temperature
High temperature packing (H)
538 °C @ 1.4 bar g 1000 °F @ 20 psi g
Minimum operating temperature
-29 °C
-20 °F
Design for a maximum cold hydraulic test pressure of:
29 bar g
2 262 psi g
TI-P405-51 EMM Issue 6
Page 8 of 11
BBV Automatic or Manually Actuated Boiler Blowdown Valves DN15 to DN50
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