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galal_elden
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Join Date: Jan 2010
Location: pipe line project - KSA ( welding inspector - CSWIP 3.1)
Posts: 36

Permissible Variations in Wall Thickness (Stainless Pipe 304)

05/27/2010 10:38 AM

I read the ASTM A 312 and ASME B36.19 searching for the Permissible variations in wall thickness for the Stainless steel pipes but no use.

the imported pipes have to be 8.18 mm (ASTM A312 TP 304 - SCH 40S) but after measuring samples we found it 7.6 mm so what is the true action.

thanks
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PennPiper
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Engineering Fields - Piping Design Engineering - Retired Piper

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#1

Re: Permissible variations in wall thick ( Stainless pipe 304)

05/27/2010 11:45 AM

Go here and read:

http://cr4.globalspec.com/thread/42250/Pipe-Wall-thickness

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galal_elden
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Location: pipe line project - KSA ( welding inspector - CSWIP 3.1)
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#2

Re: Permissible variations in wall thick ( Stainless pipe 304)

05/27/2010 11:55 AM

But this is for carbon steel pipe according to API 5L and i asked for stainless steel pipes according to ASTM A312 !!!!

and it is not pipe line it is for water well!!!

and it is seamless not welded !!!

and it well coneccteted with each other by thread !!
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Anonymous Poster
#3

Re: Permissible Variations in Wall Thickness (Stainless Pipe 304)

05/27/2010 6:41 PM

permissible variation must be lessthan 2% or mor than 2% of your thicness but not much vast diffrience about 0.58mm less so talk to the pary form where you have purchase the material secount thing we have to remind that we can get a specific size as per their jigs, dies and mould from which it has been drawn.
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Abdel Halim Galala
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Engineering Fields - Piping Design Engineering - New Member Egypt - Member - Member since 02/18/2007

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#4

Re: Permissible Variations in Wall Thickness (Stainless Pipe 304)

05/28/2010 12:37 AM

● ASME B36.19 states that permissible variations for dimensions are indicated at each specifications.

....................................

● By going to specification of ASME SA 312, we find that the permissible variation of dimensions and thickness tolerances are located at general specifications of ASME SA 450/SA 450M "Specification for General Requirements for Carbon, Ferritic Alloy, and Austenitic Alloy Steel Tubes".

....................................

● By going to ASME SA 450/SA 450M, see Para. 7 "Permissible Variations in Wall Thickness" and see Table 2.

...................................

...................................

• With the same sequence, go to the general specifications ASME SA 999/SA 999M "Specifications for General Requirements for Alloy and Stainless Steel Pipe", and don't forget to tell me what did you found..

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Abdel Halim Galala
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Engineering Fields - Piping Design Engineering - New Member Egypt - Member - Member since 02/18/2007

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#5
In reply to #4

Re: Permissible Variations in Wall Thickness (Stainless Pipe 304)

05/28/2010 1:23 AM

• ASME SA 999/SA-999M "Specification For General Requirements for Alloy and Stainless Steel Pipe"

.............................

• From ASME SA 999/SA 999M, Para. 9, see the permissible variations in pipe wall thickness, and take care when you specify your pipe wall thickness with "minimum thickness", here no tolerance will be encountered.

.............................

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galal_elden
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Location: pipe line project - KSA ( welding inspector - CSWIP 3.1)
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#6

Re: Permissible Variations in Wall Thickness (Stainless Pipe 304)

05/28/2010 2:15 AM

YOU ARE GREAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAT.

Thanks very much eng. ABD EL HALEM for cooperation and for your time.
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