Hello Stressers!!!

I know this is not related to piping stress analysis but can be adopted to a pipe trunnion support subjected to high temperature by putting an insulation at some portion of inside end of the trunnion with a plate to take advantage of the radiation inside the trunnion from the wall of pipe thus thermal gradient is minimized and therefore minimizes the thermal stress.

Anyway, my question is on the page 2 of the document below. I think the figure shows reverse description where Fig. 1a is with hotbox (air pocket) and Fig. 1b is without hotbox (no air pocket).

http://www.iaset.us/downloadnew.php?file=--1369129516-2.%20Mech%20-%20IJME%20-%20Thermo%20Mechanical%20-%20Sagar%20M.%20Sawant%20%281%29.pdf

Please correct me if I'm misinterpreting the two figures.

Many Thanks,

Cheers!!!

Borzoki,
Yes, the figures on page two shows reverse description.
Hot box arrangement is used in piping supports also in high temperature cyclic service. I had used hot box trunnion (Dummy) in Delayed coker transfer line to minimize thermal gradient.

Thanks Khalidmf for sharing.

Cheers!!!

Hello Khalidmf ,

Just wanted to Ask, Was this Hotbox type arrangement in trunnion only meant to minimize thermal gradient, OR you also took advantage of this extra thermal expansion in your Analysis?