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# hydro testing

## hydro testing

(OP)
our company uses barlow's theory for hydro testing p=2xsxt over d which is based on the actuall pressure for the start of deforming or destuction of the pipe (carbon pipe) so they use the theory but alter the value of the tensile strength and use the yield strength and then multiply that by .6 e.g. 18" carbon pipe sch 40 a 106 2 times the wall of .375 times the yield of 35k times.6 devided by o.d. of 18" =875 psi rounded to the nearst 100 900 psi is the testing pressure. my ? is does this formula meet specs and or is safe.

### RE: hydro testing

intraining,

A piece of free advice, hard-won:

You would be well-served by using complete words, sentences and paragraphs in your posts, so that the rest of us don't have to parse what you have written four times in order to read it twice and understand it once...

Jeff

### RE: hydro testing

The specs that you are working with will dictate the pressures.  Some specs require that you use nominal wall, other minimum, in the calculation.

If you work to many specs, then choose the method that gives the highest pressure.

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