Boiler safety valve installations

Details Boiler safety valve installations Boiler safety valve installations

1984-02-17

1986-09-23

Michalsky, Gerald A.

Fluid handling

Faucets and spouts

126389, 137 39, F16K 4700

Patent

active

046129588

ABSTRACT:
A boiler safety valve installation with a safety valve discharging relief steam through an upstand into a separately supported vent pipe. The upstand discharges through a belled nozzle approximately 30.degree. (0.5 steradian) included angle into the vent pipe 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 the vent pipe diameter is constricted by about 5%-10% at a zone downstream of the discharge nozzle to produce a shock front and reduce the velocity to sub-sonic, thereby reducing the frictional flow loss effects while economizing in vent pipe size without causing a build-up of back pressure in the space intermediate the discharge nozzle and the vent pipe.

REFERENCES:
patent: 4166477 (1979-09-01), Duthion et al.

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