"Calulating a Corrosion Allowance for ASME B31.3 Piping"


"Per Code, I have calculated a minimum pressure design thickness of some 6" Sch. 80, ASTM A-335, P-11 Piping. How do you arrive at a figure to allow for corrosion allowance. A corrosion allowance of 0.063" (1/16") is typical, but is there a formula or table to provide this number? Does a mandatory corrosion allowance have to be figured in to satisfy the Code?"


As far as I am aware, B31.3 does not stipulate a corrosion allowance (CA). Corrosion allowances are normally established by the end user and are somewhat based on personal preferences and industry tradition. 0.062" for piping is a common CA; however, you are free to set whatever corrosion allowances you wish, unless a state or local agency has adopted and superceded B31.3. To specify the pipe, add the CA to the minimum design thickness and select a pipe schedule that is equal to or greater than the Min. + CA.


 << return to the previous page ::


Contact Us

If you have questions or need our depth of experience to help with your issues...

Call us: 281-556-8774

Email us: info@hghouston.com


The safe operation of oil refineries in the United States is under constant r...read more
When: January 30, 2017 - February 2, 2017 Where: Galveston Island Conventi...read more

View all articles

Stay Current

Sign up for our quarterly newsletter

covering updates on corrosion