3 replies to this topic

[stu]

Dear all,

In API 520, under relief orifice sizing calculation equation, for "Q" -relieving capacity and "G" -specific gravity , it is specified as " Q at the flowing temperature & G at the flowing temperature". For thermal expansion orifice sizing, please clarify flowing temperature means relieving temperature or liquid normal operating flow temperature in the system.

thanks

stu

[latexman]

For thermal expansion orifice sizing, flowing temperature = relieving temperature = ~ liquid normal operating flow temperature in the system.

[stu]

Thanks for the response. The liquid normal operating temp.  is 25 deg.C . If the section of pipe is isolated and its temperature rises to 40 deg.C due to external heat source , to avoid over pressure TRV is considered. So here flowing temperature is 40 deg.C & density  of the liquid to be considered at 40 deg.C for calculation isn't?. Please suggest.

thanks,

Stu.

[breizh]

yes, 40C (operating condition due to external heat source)

Breizh