Hi
I am working with a new installation where we will install Pilot Operated PSVs with a maximum back pressure that is close to the set pressure of the PSVs. After contacting our normal PSV supplier, I got the information that the max capacity for the PSVs will be reduced to 80% when we have the maximum back pressure. But my question now is when calculating the rated flow (it will be popping PSVs) should I use the full capacity for the valve (without the 80% factor) due to the risk that I don’t have full back pressure in the system when I get a relief from my new valve.
In the end we will have the sizes calculated supplier but in this early stage we need some data for sizing of piping.
I am working with a new installation where we will install Pilot Operated PSVs with a maximum back pressure that is close to the set pressure of the PSVs. After contacting our normal PSV supplier, I got the information that the max capacity for the PSVs will be reduced to 80% when we have the maximum back pressure. But my question now is when calculating the rated flow (it will be popping PSVs) should I use the full capacity for the valve (without the 80% factor) due to the risk that I don’t have full back pressure in the system when I get a relief from my new valve.
In the end we will have the sizes calculated supplier but in this early stage we need some data for sizing of piping.