Dear Sir,

With reference to above discussion and earlier TEE failure issue, I am working with 72 inch line sea water line and Thickness of 15.88 mm with below temperature parameters.

Operating Temperature : 35 ◦C - T1
Max. Design Temperature : 75 ◦C - T2
Min. Design Temperature : -10 ◦C - T3

Load cases given below

Hydro test Case (L1) WW+HP Hydrotest case
Operating Case (L2) W+T1+P1 Max. Operating Temp. Case
Operating Case (L3) W+T2+P1 Max. Design Temp. Case
Operating Case (L4) W+T3+P1 Min. Design Temp. Case
Sustained Case (L5) W+P1 Sustained case
Sustained Case (L6) WNC Sustained case
Expansion Case (L7) L2-L5 Expansion at Maximum Operating Temp.
Expansion Case (L8) L3-L5 Expansion at Maximum Design Temp
Expansion Case (L9) L4-L5 Expansion at Minimum Design Temp.
Expansion Case (L10) L8-L9 Maximum to Minimum Expansion Stress Range

Experts, kindly advice the expansion stress range case (L10) is really required. If required when this case will occur in the piping system. Also advice alternate options without routing change, since this piping is congested area.