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Interpretation Response #PI-93-019 ([Arizona Corporation Commission] [Dan H. Weaklend])

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

Interpretation Response Details

Response Publish Date:

Company Name: Arizona Corporation Commission

Individual Name: Dan H. Weaklend

Location State: AZ Country: US

View the Interpretation Document

Response text:

April 28, 1993

Mr. Dan Weaklend

Chief, Pipeline Safety

Arizona Corporation Commission

1200 West Washington

Phoenix, Arizona 85007

Dear Mr. Weaklend:

This letter is to further clarify my letter of October 22, 1992, in which I tried to clarify the specific inspections and tests the operator should be required to conduct in complying with §192.739. I explained in that letter that regulator stations must be inspected and tested to comply with §192.739 using any practicable method that will demonstrate compliance with paragraphs (a) through (d) of §192.739. Set-point, lock-up, and full-stroke-operation would be part of the inspection and testing if such tests are practicable at the station concerned.

Regulator stations that use service-type regulators, such as stations that supply master meter systems, may not be equipped with valving, manifolding, or by-passes. This equipment is needed to preclude interruption of supply to a customer or group of customers while maintenance is performed. Consequently, all the inspections and tests that can be done at some regulator stations may not be practicable at stations with service-type regulators.

In addition, to us, practicable inspections and tests do not require the operator to disassemble the regulator, re-pipe the regulator, or cut off the supply of gas to the system. Instead, we suggest that, as a minimum, these service-type regulators be visually inspected, be checked for leaks (including the regulator vent), and be checked for correct set-point. Verifying the correct setpoint on a service-type regulator can be done by measuring the pressure of the gas (downstream of the regulator) with a pressure gauge. (We plan to better define "regulator station" in a future rulemaking).

I trust that I have further clarified this matter to make it easier to check for compliance with §192.739. If you have any more concerns, please call James Thomas, Southwest Regional Director.


Cesar De Leon

Director, Regulatory Programs

Office of Pipeline Safety

Regulation Sections

Section Subject
192.739 Pressure limiting and regulating stations: Inspection and testing