{"operation":"document","citation":"PI-93-019","title":"Arizona Corporation Commission — Pipeline Safety Interpretation","source_type":"guidance","agency":"Pipeline and Hazardous Materials Safety Administration","status":"guidance","official":true,"published_on":"1993-04-28","effective_on":null,"summary":"PI-93-019 response to Arizona Corporation Commission concerning 192.739.","machine_formats":{"json":"https://regulus.evalyn.ai/document/phmsa-interpretation-pi-93-019.json","markdown":"https://regulus.evalyn.ai/document/phmsa-interpretation-pi-93-019.md"},"app_url":"https://regulus.evalyn.ai/document/phmsa-interpretation-pi-93-019","source_url":"https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretation%20Files/Pipeline/1993/PI93019.pdf","body":"<<<PAGE 1>>>\n\nApril 28, 1993\nMr. Dan Weaklend\nChief, Pipeline Safety\nArizona Corporation Commission\n1200 West Washington\nPhoenix, Arizona 85007\nDear Mr. Weaklend:\nThis letter is to further clarify my letter of October 22, 1992, in which I tried to clarify the specific\ninspections and tests the operator should be required to conduct in complying with §192.739. I\nexplained in that letter that regulator stations must be inspected and tested to comply with\n§192.739 using any practicable method that will demonstrate compliance with paragraphs (a)\nthrough (d) of §192.739. Set-point, lock-up, and full-stroke-operation would be part of the\ninspection and testing if such tests are practicable at the station concerned.\nRegulator stations that use service-type regulators, such as stations that supply master meter\nsystems, may not be equipped with valving, manifolding, or by-passes. This equipment is needed\nto preclude interruption of supply to a customer or group of customers while maintenance is\nperformed. Consequently, all the inspections and tests that can be done at some regulator stations\nmay not be practicable at stations with service-type regulators.\nIn addition, to us, practicable inspections and tests do not require the operator to disassemble the\nregulator, re-pipe the regulator, or cut off the supply of gas to the system. Instead, we suggest\nthat, as a minimum, these service-type regulators be visually inspected, be checked for leaks\n(including the regulator vent), and be checked for correct set-point. Verifying the correct set-\npoint on a service-type regulator can be done by measuring the pressure of the gas (downstream\nof the regulator) with a pressure gauge. (We plan to better define \"regulator station\" in a future\nrulemaking).\ndal\\192\\739\\93-04-28\n1\n\n<<<PAGE 2>>>\n\n2\nI trust that I have further clarified this matter to make it easier to check for compliance with\n§192.739. If you have any more concerns, please call James Thomas, Southwest Regional\nDirector.\nSincerely,\nCesar De Leon\nDirector, Regulatory Programs\nOffice of Pipeline Safety\ndal\\192\\739\\93-04-28\n2","truncated":false,"body_characters":2098}