Boiler house Bottom blowdown systems
2
BBV43 Pressure/temperature limits - ASME
Pressure psi g
A
F
Steam saturation curve
F
G
51.1
10
30
Pressure bar g
The product must not be used in this region. An extended cover is required for use in this region.
2.11 6
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 (+41 °F), 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
51.1 bar g @ 38 °C
740 psi g @ 100 °F
PMO Maximum operating pressure TMA Maximum allowable temperature
425 °C @ 28.8 bar g
797 °F @ 418 psi g
A - F - F ASME 300
Minimum allowable temperature
-29 °C
-20 °F
Standard packing PTFE chevron (P)
250 °C @ 41.9 bar g 482 °F @ 608 psi g
TMO Maximum operating temperature
High temperature packing (H)
425 °C @ 28.8 bar g
797 °F @ 418 psi g
Minimum operating temperature
-29 °C
-20 °F
Design for a maximum cold hydraulic test pressure of:
77 bar g
1 117 psi g
Body design conditions
ASME 150
PMA Maximum allowable pressure
19.6 bar g @ 38 °C
284 psi g @ 100 °F
PMO Maximum operating pressure TMA Maximum allowable temperature
425 °C @ 5.5 bar g
797 °F @ 80 psi g
A - G 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)
425 °C @ 5.5 bar g
797 °F @ 80 psi g
Minimum operating temperature
-29 °C
-20 °F
Design for a maximum cold hydraulic test pressure of:
77 bar g
1 117 psi g
TI-P405-51 EMM Issue 6
Page 6 of 11
BBV Automatic or Manually Actuated Boiler Blowdown Valves DN15 to DN50
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