Skirt Expansion

Can anybody help me to dig out the reference/basic equation which normally being followed gloabally to calculate the skirt average temperature.

The calculation which is being followed is based on the curve "F" vs "kh/t^0.5". We want to know the derivation for that.
And for saddle/shoe temperature decay, normally what is the right approach.
Can you let me know the temperature dissicipation ( Degrees/M ) formula which normally is being followed for some critical systems.

I think you'll have better luck with this question in the Pressure Vessel Forum. I'll move this there.

The equation can be found in
Piping And Pipeline Assessment Guide By A. Keith Escoe

sir,

THe above book stated by you is not available in our company library.
if you can have the link for download or
you may mail me at debjpaul@in.com.


your efforts will be highly appreatiated
thanks in advance

Regarding Escoe's book:
(Sorry if this is not the proper place to ask this question)

I can't figure it out why use r1 instead of r4 on the first factor of equation 5-36.

At first I would regard this as a typo, but the same equation is used on Example 5.1 also.

Any thoughts?

Best regards,
Carlos Eduardo