[MW:27932] Required Hydrotest pressure Drop calculation due to Temperature drop

Dear Brother

We have facing problem at Hydro test , Pressure Drop same time Temperature also Drop , Now our client asking Drop calculation according to temperature drop 

We are Doing Holding time for 1 Hour at our project , Due to welded joints are full painted 

4" Line sch -120

Start Hydro test :

 Test pressure =29.4 Bar

  Temperature=35.1C

After 1 Hour 

End of Hydro test :

Test pressure =27.4 Bar

 Temperature =33.5C

I have know Temp drop will be equal to pressure Drop , Now My question how we can drive formula and shows that above hydro test accepted 

Borthers , I need pressure change for a change in test water temperature Calculation if any one can drive formula and send me or you have any excel formula please share in our group 

Best regards

Sankar.k

Welding Inspector 

Iraq 

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