Equivalent Stress Consideration for Clad Pipeline

I'm lazy, but I would do it the easy way. Ignore the (presumably thin) cladding, and just compute on the basis of the main pipe. This may not be the best solution, but....if you have an unlimited budget to design it thisaway and thataway, go for it [??]

If miles of pipe are involved, I would reconsider that.

Thanks for the response. But isnt it true that since the Youngs modulus value for both CS and Inconel are the same, the induced stresses will be equally shared by both CS and Inconel over the c/s... so if i consider the strength of CS as the limiting factor alone, won't there be any stress concentration in the clad layer because of lower strength... and also at the joints. Please advise

Cant you just compensate the thermal stress? and if you do not know how than ask for that.

Sorry... but how? now since even the thermal expansion co-efficient for both CS and CRA are almost same...thermal stresses might also be same.

In any pressure containing part (piping system, pressure vessels, ... etc.), the cladding is considered for resisting of heat and/or corrosion, and no way to consider its thickness to be added to the thickness of base metal. And inturn, no way to consider the strength of clad metal to be added to the strength of the base metal. And in general the clad metal with approx. thickness of 2-3 mm is lesser than when compared with the thickness of base metal.

So, and as an ASME code requirements, you have to consider only the specifications and strength characteristics of the base metal in stress analysis, i.e no strength to be added to the system from the cladding metal.

Hello,

I have exactly the same situation and I wonder how this shall be addressed. If we design for base material SMYS, it seems that the clad layer would work above its SMYS. Is this correct?

Regards,