Don1980, thanks. I think I will continue to use removable spools instead of spectacle blinds then. Use of locking device on a valve for physical separation of the vessel is not allowed. I agree that it seems to be different philosophies on this topic for different oil companies.
I am a part of a engineering team designing a platform in the north sea. It is com on to have positive isolation on all nozles on a pressure vessel. With positive isolation I mean spectacle blind. However, I do not find it reasonable at nozles for psv inlet lines. I.e. Upstream the psv. I think...
Can someone help to find a reference regarding spectacle blind in PSV inlet lines?
In general, I don't like to have a spectacle blind in a PSV line from a pressure vessel. For maintenance purposes, the nozzles on the vessel shall be equipped with spectacle blinds. However, for PSV lines I...
Thanks for your replies.
However, I found the ideal Cp/Cv ratio by depressurise the gas to atm pressure in the simulation model. This should be a very good approach as the compressibility factor is then close to 1.
Note, I have no change of phase during the depressurisation. Gas only.
When sizing for subcritical flow for vapour service according to API520 the isentropic expansion coefficient is needed. Assuming ideal gas the cofficient is set to the ratio between Cp and Cv.
However, how do I find the ratio as it is the ratio for the ideal gas that shall be used?
I can use...
Is it normal to follow API RP 14c for tubing? For subsea chemicals tubing connections are used. However, the shut-in pressure exceeds the subsea design pressure. In my opinion only two options exist:
1) Increase design pressure subsea
2) Install a PSV topside
However, can this be done...
