Design Criteria Buried Steel Piping
Design Criteria Buried Steel Piping
(OP)
How appropriate is a stress based criteria for the design of buried piping? I am reviewing a design of a casing pipe (30 inch diameter) that will be jacked 7 feet below a RR grade crossing. The link below, which has been mentioned in other threads here, presents a stress based criteria for the checking of buried steel piping. The suggested acceptance criteria presented in Appendix A specifically notes that an allowable deformation or strain is not applicable to earth loads (static, live, surface impact).
This is in direct contradiction to the RR specs that the design was based on. The RR specs are based on an allowable deformation of 3% of the casing pipe diameter.
As it turns out the casing pipe meets the RR spec but fails the through wall bending criteria.
Should we require thicker and higher grade of steel to meet the guidelines below?
http://www .americanl ifelinesal liance.org /pdf/burie d_pipe.pdf
This is in direct contradiction to the RR specs that the design was based on. The RR specs are based on an allowable deformation of 3% of the casing pipe diameter.
As it turns out the casing pipe meets the RR spec but fails the through wall bending criteria.
Should we require thicker and higher grade of steel to meet the guidelines below?
http://www





RE: Design Criteria Buried Steel Piping
Is there a reason why you are not using API RP-1102 ?
RE: Design Criteria Buried Steel Piping
I will be ordering API 1102 (just need a PO from my employer). I'm just trying to get a handle on the referenced standard. It s the only one that I have seen that presents an allowable stress criteria. Wasn't sure if it superceeds deflection based criteria.
RE: Design Criteria Buried Steel Piping
RE: Design Criteria Buried Steel Piping
http://www.pubs.asce.org/WWWdisplay.cgi?0411969
the modified Iowa equation is being misused as a design equation to determine the thickness of buried steel piping. I have not read the article, just the abstract. Has anyone read this article, and if so could they comment on it? The modified Iowa equation is used as the basis for through wall bending stress that is the subject of my original post.
RE: Design Criteria Buried Steel Piping
RE: Design Criteria Buried Steel Piping