photo CHPE_AnimatedWebBanner_650x1202_zps5704d467.gif
Sign in to follow this  
Followers 0
curious

Pipe Schedule & Wall Thickness

11 posts in this topic

Hi all,

How do I select which Pipe Schedule to chose for a given pipe dia to read off the wall thickness?

for example, for size of 24, u have 2 options of either schedule 5S or 10S with each having different wall thickness. how do I know which schedule to use?

thanks heaps!

Share this post


Link to post
Share on other sites

Well since there are many uses for pipe, a little more info about what you are asking may be needed to help you!

Share this post


Link to post
Share on other sites

Wow.

Share this post


Link to post
Share on other sites

I am even more in awe now that I see that in one of your posts you state that you have a Masters in Mechanical Engineering! What are you asking?

Share this post


Link to post
Share on other sites

The wall thickness is calculated based on your design pressure inside the piping and corrosion allowance. You can get the procedure to calculate wall thickness in ASME B31.1 (Power piping) or ASME B31.3 (Process Piping) which ever applies to your current job. Apply suitable corrosion allowance on the calculated wall thickness depending upon the nature of the service inside the pipe.

Once you have calculated the above, you should select the nearest (towards the higher side) pipe schedule from your schedule tables.

Hope this is what you wanted to know.

Share this post


Link to post
Share on other sites
The wall thickness is calculated based on your design pressure inside the piping and corrosion allowance. You can get the procedure to calculate wall thickness in ASME B31.1 (Power piping) or ASME B31.3 (Process Piping) which ever applies to your current job. Apply suitable corrosion allowance on the calculated wall thickness depending upon the nature of the service inside the pipe.

Once you have calculated the above, you should select the nearest (towards the higher side) pipe schedule from your schedule tables.

Hope this is what you wanted to know.

Of course if you want to get really fancy, you can factor in permissible undercut, too. That one's become an interesting topic around the job site as of late with our AI's with all the min wall pipe being ordered...

Share this post


Link to post
Share on other sites
Of course if you want to get really fancy, you can factor in permissible undercut, too. That one's become an interesting topic around the job site as of late with our AI's with all the min wall pipe being ordered...

I guess you are talking about mill tolerance.

Share this post


Link to post
Share on other sites
I guess you are talking about mill tolerance.

Quite a bit of our high dollar pipe is ordered based on minimum wall thickness rather than typical wall schedules (large bore power piping).

Share this post


Link to post
Share on other sites
Quite a bit of our high dollar pipe is ordered based on minimum wall thickness rather than typical wall schedules (large bore power piping).

Yes, I think that is generally the case for ID based piping. In one project, I was designing boiler feed water piping and operating pressures was 150 barg on the BFW pump discharge. We used A106 Grade C material for the application, and we just used the minimum wall thickness as the basis.

Share this post


Link to post
Share on other sites

B31.1 does not actually require you to include corrosion allowances in the MWT calculation, is it recommended, but not required.

B31.3 may be different, I have not read that code yet cover to cover.

Also, 24" pipe comes in more MWT than 5S and 10S, wait, where did OP go?

Share this post


Link to post
Share on other sites

I guess I must apologize for my response since I appear to be out of line. There are all good answers here and I am curious if the OP resolved the issue?

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0