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Interpretation Response #PI-71-082


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

Interpretation Response Details

Response Publish Date: 11-11-1971
Company Name: Tennessee Public Service Comm    Individual Name: John Searcy
Location state: TN    Country: US

View the Interpretation Document


Response text:

Mr. John Searcy
Engineering Division
Tennessee Public Service Comm
Cordell Hull Building
Nashville, Tennessee 37219

Dear Mr. Searcy:

This letter id a further reply to your letter of October 5, 1971, in which you posed the question in paragraph 192.197(c)(2), it is stated that a service regulator and a monitoring regulator are required. Would you consider two (2) regulators in series both set at the same pressure as being a service regulator and a monitoring regulator?

In answer to your question the requirements of 49 CFR 192.197(c)(2) will be met with two regulators in a series, but it will be necessary to have some difference in the setting of the two regulators to avoid operating difficulties. The sketches that you submitted of the various options open for the design of a regulatory installation conforms to the intent of §192.197(c).

Sincerely,

/signed/

Joseph C. Caldwell
Acting Director
Office of Pipeline Safety


Regulation Sections

Section Subject
§ 192.197 Control of the pressure of gas delivered from high-pressure distribution systems