Kellogg Equivalent Pressure Method for SHORT TIME COND.

hi,
I need to perform leakage check for a pipe line according to Kellogg Peq method.
This pipe line has two thermal conditions:
- T1 Design Operating Temperature (300 C) @5bar
- T2 Short-Time Operating Temperature (400 C) @5bar

The ASME code suggests: P+P(eq) < 1,0*P(rating)
Anyway, we have accepted P+P(eq) < 1,4*P(rating), after client's request.

Now, I face problem with leakage check in T2 short-time cond.
What is the normal approach and practice for the leakage check in short time conditions?
Is there any reference in ASME Code for short time cond. ?

thanks
steves

This isn't what you're looking for but...
B31.3 302.2.4 gives information on allowances for overpressure when determining your design pressure/temperature. It says "Subject to the owner's approval, it is permissible to exceed the pressure rating..." and goes on to set limits which by rule cannot be exceeded in any case. 302.2.4(f)(1)(a) says you can exceed the rating by no more than 33% for no more than 10 hours at any one time and no more than 100 hours per year.
Perhaps you can justify applying that limit. I can't say. It's important, though, to get the owner's approval.

THANKS FOR UR HELP DAVE!

Steves,

In this case, you maybe can perform also an ASME VIII div.1 analysis

Ciao