Determining maximum pipe wall wear
Determining maximum pipe wall wear
(OP)
Hello,
We have recently had a pipeline checked for wear and I wan't to determine what the maximum amount of wear (or reduction in wall thickness) before the pipe must be replaced.
We are using ASTM A53B 12" Sch 80 steel pipe with a wall thickness of 12.7mm.
The maximum pipe pressure seen in the line is 45Bar.
Unfortunately I don't have a copy of ASTM B31.3 available therefore don't have access to some of the tables.
I was looking to use the calculator on the link;
http ://www.pip ingenginee r.com/onli ne/pipewal lcalc.html
however I don't have some of the information for this type of pipe i.e Stress Value for Mat'l table A-1
If someone could offer some assistance with working on this it would be much appreciated.
We have recently had a pipeline checked for wear and I wan't to determine what the maximum amount of wear (or reduction in wall thickness) before the pipe must be replaced.
We are using ASTM A53B 12" Sch 80 steel pipe with a wall thickness of 12.7mm.
The maximum pipe pressure seen in the line is 45Bar.
Unfortunately I don't have a copy of ASTM B31.3 available therefore don't have access to some of the tables.
I was looking to use the calculator on the link;
http
however I don't have some of the information for this type of pipe i.e Stress Value for Mat'l table A-1
If someone could offer some assistance with working on this it would be much appreciated.





RE: Determining maximum pipe wall wear
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RE: Determining maximum pipe wall wear
RE: Determining maximum pipe wall wear
When I enter this value into the formula I get a wall thickness of 73.8mm!
The values I have used are:
Pipe O.D (mm.) 300
Internal Design Pressure (barg) 52.53
Stress Value for Mat'l from Table A-1 (N/mm2) 9.722
Quality Factor ,E 0.8
Corrosion Allowance (mm) 1.58
Coefficient,Y (mm) 0.9
Can you see where I have gone wrong?
RE: Determining maximum pipe wall wear
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RE: Determining maximum pipe wall wear
http
RE: Determining maximum pipe wall wear
9722 kPa is the ALLOWABLE PRESSURE for 300mm sch 80,
NOT the allowable stress!
Allowable stress is 137800 kPa, put that in the online calculator.
RE: Determining maximum pipe wall wear
Using 137800kPa = 137.8N/mm2
I got a wall thickness of 7.7mm.
RE: Determining maximum pipe wall wear
Cheers.