3 replies to this topic

[shivaprasad]

Pipe spec where we need to specify... I have attached file, there are three cases which one is correct to show pipe spec.

 

Basically it is  Fuel gas connection to flare header.

 

Attached Files

•  pipe spec.docx   102.95KB   37 downloads

[farid.k]

For me, as long as it is understandable where the needed spec break location it should be ok regardless of how it represent in the P&ID. It just a cosmetic issue. The main thing is make sure it is at correct location i.e. if the spec break is downstream of the valve, don’t put it at the upstream of the valve.

Kindly refer hand sketch for my previous practice. 

Attached Files

•  hand sketch.JPG   26.14KB   3 downloads

[shivaprasad]

what it means  I couldn't understand  farid.k ""if the spec break is downstream of the valve, don't put it at the upstream of the valve"

[farid.k]

what it means  I couldn't understand  farid.k ""if the spec break is downstream of the valve, don't put it at the upstream of the valve"

dear shiva,

 

"Spec break" happens where there is a change from one significant design condition to another.

For example, at up stream of the PSV there is a design condition with a higher pressure that requiring a higher pipe spec i.e. 300# rating pipe spec.  Down stream of the PSV there is a flare collection system (or atmosphere) with a much lower design condition which is not necessary to use 300# rating. Thus it is more reliable & economical to use 150#.  Therefore there would be a "spec break" at the downstream side of the PSV.

 

hope this help