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rajuaji
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Join Date: Jul 2012
Posts: 3

How to Calculate Minimum Structural Wall Thickness for Stainless Steel Piping ?

07/10/2012 10:40 PM

How to calculate minimum structural wall thickness for stainless steel piping ?
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lyn
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#1

Re: How to calculate minimum structural wall thickness for stainless steel piping ?

07/10/2012 10:48 PM

Are you a student?

Are you a contractor?

Are you a piping designer?

Are you an engineer?

Why do you want to know how to do this?
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brkmech
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#2

Re: How to calculate minimum structural wall thickness for stainless steel piping ?

07/11/2012 12:21 AM

Structural wall thickness? What is the application?

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Just an Engineer
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#3

Re: How to calculate minimum structural wall thickness for stainless steel piping ?

07/11/2012 3:03 AM

I thought we did this about a year ago. Depends whether the pipe is self supporting above ground (and the span), internal pressures, grade of SS and so on, external loading (if burried) etc.

Can I sugges thtat you use the "Search all of CR4" option on the right hand side and see what comes up.

By the way, welcome to CR4. I hope that you enjoy the experience, but please be aware that members here will avoid items that look like homework, or where the originator hasn't done some basic background effort.

They especially get upset when the OP (That's our jargon for "Original Poster") doesn't stay in contact with the material and acknowledge the efforts of others.

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PWSlack
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Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
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#4

Re: How to calculate minimum structural wall thickness for stainless steel piping ?

07/11/2012 3:29 AM

Why calculate when nearly everyone else looks it up in standardised tables <rhetorical question>?

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Anonymous Poster #1
#5

Re: How to Calculate Minimum Structural Wall Thickness for Stainless Steel Piping ?

07/11/2012 10:42 AM

You must know the following:

- Design temperatures and pressures of the system

- Specific type of stainless steel piping.

- Diameters of piping that you desire (diameters are based on flow requirements)

- Code of construction for your installation

- .....and more

In the USA, ASME B31.1 and B#1.3 contain rules for calculating minimum wall thickness.

Since you are a new engineer and have never done this before, there is probably no one in your organization that can answer any technical questions.

You, of course, have many bosses and supervisors that all want to know "When will this calculation be completed ? "

Is that correct ?

Banu, tell us more about your system....
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ducon
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#6

Re: How to Calculate Minimum Structural Wall Thickness for Stainless Steel Piping ?

07/11/2012 1:15 PM

i did send a formula a couple of threads back. check.

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rajuaji
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#7

Re: How to Calculate Minimum Structural Wall Thickness for Stainless Steel Piping ?

07/12/2012 12:32 AM

thanks to everybody

I worked as a plant inspector.

generally minimum required thickness (for in service) is the greater value of the pressure design thickness or the structural minimum thickness.

Pressure design thickness can calculated as per rating code (eg:ASME B31.3).

API already established structural minimum alert thickness for carbon steel and low alloy steels piping in API RP 574 table 6. but not mentioned for stainless stainless steel and high alloy steel.

some company already established structural minimum alert thickness for stainless stainless steel and high alloy steel.

How to Calculate Minimum Structural Wall Thickness for Stainless Steel Piping ?
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ducon
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#8

Re: How to Calculate Minimum Structural Wall Thickness for Stainless Steel Piping ?

07/12/2012 12:52 AM
Check out this Thread

Re: Thickness Calculation

07/04/2012 1:34 AM
What is the formula used to determine the minimum wall thickness after bending a boiler pipe?

Read more: http://wiki.answers.com/Q/What_is_the_formula_used_to_determine_the_minimum_wall_thickness_after_bending_a_boiler_pipe#ixzz1za8G9ph6

See ASME B31.3 for low pressure boilers. For power boilers use ASME B31.1

Specifically Paragraph 304 where the following formula is found:

t= PD/ 2[(SEW/I)+PY]

Where:

I= [4(R/D)+1]/[4(R/D)+2] for the extrados of the bend

and

I= [4(R/D)-1]/[4(R/D)-2] for the intrados of the bend

t= minimum wall thickness required at design pressure
P= design pressure required
D= Pipe diameter (outer diameter)
S= allowable stress at temperature (20,000 psi for A269 TP304 SS at 300 degrees Fahrenheit)
E= quality factor (0.85 for fusion welded ). See B31.3 for other values.
W= Weld joint strength reduction factor (1.00 for non welded) see B31.3 for specific values - if you do not have welds in your bend then use 1.00
Y= 0.4 for Ferritic Steels at 900 degrees Fahrenheit or lower. See B31.3 for other values.

Read more: http://wiki.answers.com/Q/What_is_the_formula_used_to_determine_the_minimum_wall_thickness_after_bending_a_boiler_pipe#ixzz1za7pTQpw

Formula calculating Thickness of a Cylinder:

((pi*d Outside)-(pi*d inside))/2

What is the formula to calculate minimum thickness of base plate?

base plate for what??
pump and electric motor

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Users who posted comments:

Anonymous Poster (1); brkmech (1); ducon (2); Just an Engineer (1); lyn (1); PWSlack (1); rajuaji (1)

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