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Quick opening closure for PV

Quick opening closure for PV

Quick opening closure for PV

(OP)
I´m trying to develop a QOC for one PV but I´have had problems to calculate it. So, I´m looking for rules, calculations, memos and other ways to make a good job. Somebody can help me?

RE: Quick opening closure for PV

There's an old article that we used one time for the lug forces & moments going into the shell.  P.Seide, "On the Bending of Circular Cylindrical Shells by Equal & Equally Spaced End Radial Shear Forces & Moments," Trans. ASME, Jnl Applied Mech., March 1961, pp.117-126.   Get equivalent uniform loadings, then use beam-on-elastic-foundation eq's from Roark.  Kinda painful the first time through, but not bad if you put it into mathCAD.

RE: Quick opening closure for PV

Frankly speaking if I wanted to relieve the pressure in a vessel I would use a properly designed and certified relief valve, anything else seems like second best. Have inspected quick opening closures before and because of maintenace problems took 2 guys 1hour to open with 6ft poles

RE: Quick opening closure for PV

How does a relief valve allow you to relieve the pressure in a vessel unless you have a lifting lever or some other way to keep the valve open once the pressure reaches the valve's blowdown setting and it attempts to close?

RE: Quick opening closure for PV

The valves are used to relieve all internal pressure before opening is begun, & ensure the lid is fully shut before pressurization is started. [see UG-35.2] Sometimes a vent valve with a pin that rides on the valve stem screw is used.  One time we used a ball valve with a disk with a quadrant removed that engaged a slot on a lug - that was for food service where a cleaning was required.

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