2 replies to this topic

[colt16]

Dear all, I need help understanding a particular term in this API RP 521 equation for depressurisation rate manual calculation without process simulator.

 

This is from API RP 521 2007 5th edition. I have attached a screenshot of the equation that I need help with in this post. 

 

Does the term refer to the initial liquid inventory in the vessel?

Attached Files

•  API RP 521.JPG   25.29KB   32 downloads

Edited by tanykiat, 25 February 2013 - 04:22 AM.

[thorium90]

Nomenclature is on pg70

Attached Files

•  nomenclature pg70.jpg   114.76KB   22 downloads

[colt16]

It says:

 

"(qm,a.t) is used only for consistency, and qm,a has no physical significance"

 

I just want to know if I understand it correctly that the (qm,a.t) term refers to initial liquid inventory (i.e. before any depressurisation occurs).