Pipeline Safety Interpretation PI-77-0103

Page 1PI-77-0103 February 23, 1977 Mr. Alex W. Gaines Brown & Root, Inc. P.O. Box Three Houston, Texas 77001 Dear Mr. Gaines: This responds to your letter dated October 5, 1976, in which you ask for an interpretation of 49 CFR 195.106 and 195.110. Question 1: What Design Factor F is presently required in Paragraph 195.106? Answer: At present, Section 195.106 requires a design factor F of 0.72 to be used in the design formula for determining the internal pressure of any new, replaced, or relocated pipeline with one exception. The exception is that a design factor F of 0.54 must be used for pipe that has been cold worked to meet specified minimum yield strength and is subsequently heated other than by welding to a temperature of 600 degrees Farenheit or more. Question 2: What Design Factor F will be required August 1, 1977? Answer: Beginning August 1, 1977, there are three applicable design factors under Section 195.106. In addition to the design factors of 0.54 and 0.72 mentioned in response to Question 1, a new design factor F of 0.60 must be used for pipe, including risers, on a platform located offshore or in inland navigable waterways. Question 3: Do the above Design Factor F revisions affect the Paragraph 195.110, which refers to Paragraph 419 of ANSI B31.4? Answer: No. The requirements of Paragraph 419 apply notwithstanding the amendment to Section 195.106. Sincerely, SIGNED Cesar DeLeon Acting Director Office of Pipeline Safety Operations#

Page 2Brown & Root, Inc. P.O. Box Three Houston, Texas 77001 October 5, 1976 Mr. Joseph C. Caldwell, Director Office of Pipeline Safety Department of Transportation Washington, D. C. 20590 Dear Mr. Caldwell: Your interpretation of Title 49, Paragraph 195.106 and Paragraph 195.110 is respectfully requested concerning the following questions: 1. What Design Factor F is presently required in Paragraph 195.106? 2. What Design Factor F will be required August 1, 1977? Reference Federal Register 41, No. 157 - Thursday, August 12, 1976. 3. Do the above Design Factor F revisions affect the Paragraph 195.110, which refers to Paragraph 419 of ANSI B31.4? Specifically, a. Is the allowable stress range - SA = .72 specified minimum yield? b. Are the sustained external loadings not to exceed .75 SA? c. Are occasional loads not to exceed 80 percent of specified minimum yield strength? Your comments on the above will be gratefully appreciated. Sincerely, Brown & Root, Inc. Alex W. Gaines#