imatasb
Chemical
- Jul 17, 2003
- 32
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
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
