Interpretation Response #PI-77-0103

Below is the interpretation response detail and a list of regulations sections applicable to this response.

Interpretation Response Details

Response Publish Date: 02/23/1977

Company Name:

Individual Name:

Location State: TX Country: US

View the Interpretation Document

Response text:

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
Brown & 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

Regulation Sections