{"operation":"document","citation":"PI-71-001","title":"Charles Wheatley Company — Pipeline Safety Interpretation","source_type":"guidance","agency":"Pipeline and Hazardous Materials Safety Administration","status":"guidance","official":true,"published_on":"1971-08-01","effective_on":null,"summary":"PI-71-001 response to Charles Wheatley Company concerning 195.426.","machine_formats":{"json":"https://regulus.evalyn.ai/document/phmsa-interpretation-pi-71-001.json","markdown":"https://regulus.evalyn.ai/document/phmsa-interpretation-pi-71-001.md"},"app_url":"https://regulus.evalyn.ai/document/phmsa-interpretation-pi-71-001","source_url":"https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretation%20Files/Pipeline/1971/PI71001.pdf","body":"<<<PAGE 1>>>\n\n71-00-00\nMr. Del Moore, Chief Engineer\nCharles Wheatley Company\n911 South Main Street\nTulsa, Oklahoma 74119\nDear Mr. Moore:\nThis refers to your letter of June 7, 1971 and our reply of June 18, 1971, concerning certain aspects of\nthe liquid pipeline regulations, particularly Section 195.426.\nThe main purpose of Section 195.426 is to minimize the opening of end closures on scraper and sphere\nfacilities while the facility is subjected to pressure, and thereby reducing the possibility of injury to\npersonnel removing the end closure. There are two requirements contained in Section 195.426. One\nrequirement is that the barrel in which the scraper or sphere is inserted or removed contains a relief\ndevice, such as a blowoff, which can be used to relieve pressure on the barrel prior to opening the end\nclosure on the barrel. The second requirement is that the end closure itself must contain a device to\neither prevent the closure from being removed prior to release of the pressure on the barrel or to\nindicate that pressure still remains on the barrel. The \"lock and bleed\" device on Yale closures and the\n\"pressure warning device\" on Tube Turn closures satisfy the second requirement mentioned above.\nYou raised the question in your June 7, 1971 letter, as to whether the above mentioned devices would\nsatisfy the \"relief valve feature\" of the regulation. Section 195.426 contains the term \"relief device\" but\nnot the term \"relief valve.\" You might have been thinking of a device that would relieve pressure in the\nbarrel automatically if it become as high as the preset valve on the relief valve. Section 195.426\ncontains no such requirement.\nThe information that you recently provided to this department, revealed that the scraper and sphere\nfacilities designed by your firm include a blowoff device, as previously mentioned, in addition to the\n\"lock and bleed\" device. This indicates that the Charles Wheatley Company is fulfilling the\nrequirements of Section 195.426 in design of scraper and sphere equipment.\nSincerely yours,\nMac E. Rogers\nDirector\nBureau of Railroad Safety\nDB/dal/195.426\n71-00-00\n1","truncated":false,"body_characters":2123}