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Combination coorection factor

Combination coorection factor

Combination coorection factor

(OP)
Hi fellows,

I was doing some relief calculation numbers but there is something which I don't see very clear.

According to API 520 if I have a bursting disk and a relief valve after I:

-Use a 0.62 as discharge coeffcient for the bursting disk
-There is no combination correction factor for the B.disk (or it's 1) even though I have a relief valve placed after

-Use 0.975 for the relief valve Kd
-Use 0.9 as a combination correction factor.


Obviously the relief valve is creating some backpressure (number which I haven't got) that it is affecting the relief capacity of the disk but I am not accounting for it. But when calculating the size of the relief valve the bursting disk is accounted in the 0.9.

Some light abouth this please?

Cheers

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