1"->6" sch10 SS aisi 316 @ 435psi & 480¦F is OK? 1

[azertyuiop]

I have received from a piping contractor a quote proposal for a process plant I am project managing.

The fluid streaming in the pipes is coconut oil at 250°C or 480°F maximum temperature, oil being put at max. 30bar operational pressure, MAWP being 35bar or 435psi (1bar=14.5psi).

piping diameters are 1" , 2" , 3" , 4" and 6".

The contractor says a schedule 10 stainless steel Aisi316 material is sufficient for that pressure at that temperature .

I don't have the required knowledge to verify this.

Can one of the specialists here confirm or deny, based on his experience?

 

[metengr]

Go back to the contractor and have them provide design calcs or some method of rationale to support their recommendation. All YOU need to do is to make sure that the design calcs or the rationale the contractor used for selecting this pipe schedule is based on some reference to the ASME B31.3 Process Piping Code. If the contractor cannot provide design calcs or some type of engineering rationale to support the pipe size and schedule selection, go find someone else.

 

[BigInch]

It might not be a B31.3 code design. What is your plant design code?

BigInch-born in the trenches.

http://virtualpipeline.spaces.msn.com

 

[azertyuiop]

Metengr, I followed your advise, after doing some internet search for myself, which showed that the 4" and 6" where not strong enough (welded pipe 6" nominal working pressure = 80% seamless pipe pressure = max 27 bar, instead of the 40 bar design I asked).

The contractor submitted an apology, and sent me his own pipe supplier's documentation having a P/T graph, and clearly showing that he should have used a sch40S for the 4" and 6" pipes.

big inch, the code is AD-2000, german based one.

the problem is solved.