Boiler house Bottom blowdown systems
2
BBV63 Pressure/temperature limits - EN 1092
A
L
Steam saturation curve
L
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 7
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
PN40
PMA Maximum allowable pressure
40 bar g @ 100 °C
PMO Maximum operating pressure TMA Maximum allowable temperature
400 °C @ 27.4 bar g
A - L - L PN40
Minimum allowable temperature
-29 °C
Standard packing PTFE chevron (P)
250 °C @ 31.8 bar g
TMO Maximum operating temperature
High temperature packing (H)
400 °C @ 27.4 bar g
Minimum operating temperature
-29 °C
Design for a maximum cold hydraulic test pressure of:
60 bar g
TI-P405-51 EMM Issue 6
Page 7 of 11
BBV Automatic or Manually Actuated Boiler Blowdown Valves DN15 to DN50
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