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U.S. Department of Transportation U.S. Department of Transportation Icon United States Department of Transportation United States Department of Transportation

Interpretation Response #PI-75-012 ([San Diego Gas & Electric Company] [Paul L. Hathaway])

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

Interpretation Response Details

Response Publish Date:

Company Name: San Diego Gas & Electric Company

Individual Name: Paul L. Hathaway

Location State: CA Country: US

View the Interpretation Document

Response text:

Mr. Paul L. Hathaway
Vice President - Gas
San Diego Gas &; Electric Company
P. O. Box 1831
San Diego, Ca 92112

Dear Mr. Hathaway:

Referring to your letter of February 21, 1975, and figures attached thereto, the redesigned riser
shown in Figure 2 with a protective sleeve covering all plastic materials aboveground appears to
meet the requirements of 49 CFR 192.375(a) for protection of plastic service lines. Although we
do not have enough information to opine whether the riser shown in Figure 2 would meet all the
requirements of 49 CFR 192.123, we have particular misgivings about its meeting the temperature
limitations of section 192.123(b) under ordinary aboveground operating conditions.

The two 4-inch PVC lines which are shown in Figure 3 are mains. This is so because in
accordance with the definition of the term "main" in 49 CFR 192.3 each 4-inch line serves as a
common source of supply for more than one service line.

We trust this adequately responds to your inquiry.


Joseph C. Caldwell
Office of Pipeline Safety

Regulation Sections

Section Subject
192.123 Design limitations for plastic pipe
192.375 Service lines: Plastic