Boiler safety valve installations

Details Boiler safety valve installations Boiler safety valve installations

F - Mech Eng,Light,Heat,Weapons

22

B

122/155

F22B 37/44 (2006.01)

Patent

CA 1216484

ABSTRACT A boiler safety valve installation with a safety valve 2 discharging relief steam through an upstand 10 into a separately supported vent pipe 12 (Fig.1). The upstand discharges through a belled nozzle 24 of approximately 30° (0.5 steradian) included angle into the vent pipe 12 thereby, on discharge of relief steam, inducing a sub-atmospheric pressure in the space intermediate the discharge nozzle and the vent pipe and lessening the risk of escape of steam at a sliding junction between the upstand and the vent pipe. In installation where the relief steam flow reaches supersonic velocity at discharge from the belled nozzle 24 the vent pipe diameter is constricted by about 5% - 10% at a zone 34 downstream of the discharge nozzle 24 to produce a shock front and reduce the velocity to sub-sonic, thereby reducing the frictional flow loss effects whilst economising in vent pipe size without causing a build-up of back pressure in the space intermediate the discharge nozzle and the vent pipe.

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