Pipe wall thickness sizing 3

[Simba12345]

Hi,

I am doing the calculations for selecting pipe wall thickness using asme b31.3.

the pipe application will be the transfer of high pressure water from a plunger pump to spray bars with atomizing nozzles. the pump has a PRV that operates at 250 bar and saftey valve is set at 290 bar.

the customer wants to use stainless steel pipes.

I am using formula (3a) "304.1.2 Straight Pipe Under Internal Pressure"

it is a seemless pipe with material grade is TP316L spec no A312. (alowable stress is 16700 psi)

working temperature 20-30 C.

1st question is that what design pressure do i use? 250, 290 or higher?

I have done the calculations using 300bar as the desing pressure and the biggest pipe OD that i could find to work was 1 inch pipe sch80s with OD of 1.315.

Follow up question, how are the bursing pressures in ASTM a312 stainless steel pipes chart calculated? when should that chart be used.

difference between desing pressure and bursting pressure?

sorry i have been looking at all the different information and am a bit confused.

 

[DavidCR]

The only good use of the burst pressure I´d recommend is to compare the safety factor of the code you are using and the safety factor of the manufacturer (commonly based on cold water pressure tests not on code comitee criteria).

If your case is "special" and no public user can be related if something happens you may take the risk.

I think the manufacturer states the bursting pressure in order to have a reference for quality or in case of a claim or incident.

I remember a case where a PE pipe bursted on site several times. On a factory burst test it resisted a very high pressure (above stated bursting pressure). The manufacturer proved that the pipe was not deffective and the problem was not his fault (abnormal conditions or bad selection/design).

 

[David3399]

2" sch 160
3" Sch XXS