High Pressure Piping Design, B31.3, Chapter IX
High Pressure Piping Design, B31.3, Chapter IX
(OP)
I have the following questions with regards to Chpt.IX:
* If t > D/6, must I use Chapter IX, or can I still use the formulae provided by Chapter II? If so, what are the considerations/modifications to formulae in Chapter II?
* Can someone provide a synopsis of the requirements/limitations of Chapter IX?
Thank you in advance!
* If t > D/6, must I use Chapter IX, or can I still use the formulae provided by Chapter II? If so, what are the considerations/modifications to formulae in Chapter II?
* Can someone provide a synopsis of the requirements/limitations of Chapter IX?
Thank you in advance!





RE: High Pressure Piping Design, B31.3, Chapter IX
When a plant owner designates the piping as "high pressure service", then all the provisions of ASME Chapter IX B31.3 Specification apply without exception.
Some of the considerations that apply to "high pressure service" are:
a) pressures attained are greater than ANSI Class 2500
flanges for the particular material and temperature,
b) maximum allowable stresses are based upon 2/3 of the
material yield; this holds across the board for the
application temperature and material,
c) Category "M" Fluid Service.
I have always considered t>D/10 since this typically is referred to in pressure vessel textbooks.
Kenneth J Hueston, PEng
Principal
Sturni-Hueston Engineering Inc
Edmonton, Alberta Canada
RE: High Pressure Piping Design, B31.3, Chapter IX
RE: High Pressure Piping Design, B31.3, Chapter IX