# David Dolgoy — Pipeline Safety Interpretation - **operation:** document - **citation:** PI-79-035 - **title:** David Dolgoy — Pipeline Safety Interpretation - **source type:** guidance - **agency:** Pipeline and Hazardous Materials Safety Administration - **status:** guidance - **official:** true - **published on:** 1979-10-12 - **effective on:** Not available - **summary:** PI-79-035 concerning 192.611. - **machine formats:** - **json:** https://regulus.evalyn.ai/document/phmsa-interpretation-pi-79-035.json - **markdown:** https://regulus.evalyn.ai/document/phmsa-interpretation-pi-79-035.md - **app url:** https://regulus.evalyn.ai/document/phmsa-interpretation-pi-79-035 - **source url:** https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretation%20Files/Pipeline/1979/PI79035.pdf **body:** <<>> Mr. 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 - **truncated:** false - **body characters:** 774