Max Working Pressure. 4

[Tigertim1]

I am trying to determine if Sch 40 Stainless Steel pipe
is suitable for 250bar High pressure water.
Water is at 18 to 20 deg C

Or do i need to consider Sch 80 Seamless Pipe

 

[EdStainless]

What diameter?
What kind of service? You need to look at design codes for this answer.

= = = = = = = = = = = = = = = = = = = =
Plymouth Tube

 

[Tigertim1]

1" & 1/2" Size

It is a high pressure wash line, fed from a high pressure pump station.

 

[metengr]

See ASME B31.3 for design details.

 

[ApC2Kp]

tigertim,
You need to consider using Sch80s pipe. And there is not huge cost impact for those smaller sizes.
The high pressure wash operation might have some on-off cycling, and then you also will need to consider possible pressure surges above the 250 bar for design.

 

[metengr]

There is much more to this than simply stating a pipe schedule for use. Material specification, joining, inspection, adequate pipe support, etc. Look into the appropriate piping code, and do it right! High pressure water can hurt someone and take equipment out.

 

[BUTCHCWIQAM]

Using Sch 80 seamless should not even be a question at 250bar, you need to have all welds inspected 100% visual and I would advise that you X-ray 20% just to start
you have to take into consideration that you will have to test the line at 1.5 times design and if 250bar(3625.943psi) is the design, 375bar (5438.9145psi) will be the test pressure... these are not pressures to play around with... do it right the first time
Get qualified Inspectors and qualified welders as well this is one time doing it cheap may kill someone!

 

[Tigertim1]

THANKS TO EVERYONE WHO TOOK TIME TO RESPOND.

Taking BUTCHCWIQAM Advice on design.

Regards,
TIGERTIM1