Guidanceguidance
PI-79-035
David Dolgoy — Pipeline Safety Interpretation
Current as of source date Government source
RegulusPipeline researchRegulusPipeline researchPI-79-035
Page 1Mr. David Dolgoy 10625 Jasper Avenue R 521, Corona Hotel Edmonton, Alberta Canada T5J1Z8 Dear Mr. Dolgoy: This responds to your letter of September 3, 1979, concerning the intent of the term "hoop stress" as used in 49 CFR §192.611 Hoop stress. In your letter, you correctly assume that "hoop stress" is the actual stress produced by a given internal gas or liquid pressure in a pipeline and would be calculated using "Barlows" formula. This calculation would not involve the use of the de-rating factors specified in §192.105 Design formula for steel pipe. Thank you for your interest in Pipeline Safety. Sincerely, /signed/ Cesar De Leon Associate Director for Pipeline Safety Regulation Materials Transportation Bureau DB C:\WP51\INTERPRT\192\611\79-10-12 1#
This material provides agency context. It does not replace binding regulatory text, and its legal effect depends on the underlying authority and facts.