Quick opening closure for PV 1

[Degas]

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?

 

[JohnBreen]

Hello,

Please read these before you proceed:

http://www.nationalboard.org/Classics/classic31.html

http://www.nationalboard.org/Classics/classic23.html

http://www.nationalboard.org/Classics/classic9.html

Thank you for taking the time.

Regards, John.

 

[arto]

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.

 

[athomas236]

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

 

[TD2K]

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?

 

[arto]

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.