{"operation":"document","citation":"PI-75-0106","title":"Illinois Commerce Commission — Pipeline Safety Interpretation","source_type":"guidance","agency":"Pipeline and Hazardous Materials Safety Administration","status":"guidance","official":true,"published_on":"1975-06-12","effective_on":null,"summary":"PI-75-0106 response to Illinois Commerce Commission concerning 192.619.","machine_formats":{"json":"https://regulus.evalyn.ai/document/phmsa-interpretation-pi-75-0106.json","markdown":"https://regulus.evalyn.ai/document/phmsa-interpretation-pi-75-0106.md"},"app_url":"https://regulus.evalyn.ai/document/phmsa-interpretation-pi-75-0106","source_url":"https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretation%20Files/Pipeline/1975/g75-06-12_Shutt_192.619-msfx.pdf","body":"<<<PAGE 1>>>\n\nPI-75-0106\nJune 12, 1975\nMr. Harold E. Shutt\nChief Engineer - Gas & Electric\nIllinois Commerce Commission\n527 East Capitol Avenue\nSpringfield, Illinois 62706\nDear Mr. Shutt\nThis refers to your letter of May 26, 1975, notifying us of your advice to the Central Illinois Public Service\nCompany (CIPSC) about uprating a distribution line to a pressure permitted by Section 192.619(a)(2)(ii) of 100\npsig, or more, that will produce a hoop stress of less than 30 percent of SMYS. You stated, that in accordance\nwith Advisory Bulletin No. 75-2, the line may be uprated \"without performing a strength test.\"\nWhile your advice is not incorrect, we believe that it may be misleading. By informing CIPSC that a \"strength\ntest\" is not required in uprating to a pressure permitted by Section 192.619(a)(2)(ii), CIPSC may not\nunderstand that the published interpretation of this Office is that some type of pressure test is required,\nwhether it be a strength test or a leak test. The purpose of the interpretation to which you refer in Advisory\nBulletin No. 75-2 is to clarify this point. Accordingly, we suggest that you so notify CIPSC.\nSincerely,\nOriginal signed by\nJoseph C. Caldwell\nDirector\nOffice of Pipeline Safety\n\n<<<PAGE 2>>>\n\nSTATE OF ILLINOIS\nIllinois Commerce Commission\n527 EAST CAPITOL AVENUE\nSPRINGFIELD, ILLINOIS 62706\nMay 26, 1975\nDirector, Office Pipeline Safety\nDepartment of Transportation\n400 7th Street, S.W.\nWashington, D. C. 20590\nRe: Notice of interpretation\nDear Sir:\nCentral Illinois Public Service Company in Springfield, Illinois, has a 4.500\" O.D. distribution line and a 2.375\"\nO.D. distribution stub, both operating at 275 psig. They desire to increase the operating pressure on the\n2.375\" O.D. and 4.500\" O.D. line segments to 350 psig.\nThe 2 1/2 mile 4.500\" O.D. line segment was installed in 1930. The line segment is 0.237 inch wall thickness,\nhas the original coating still intact, is of welded construction, has been under rectifier cathodic protection\nsince 1960 and has no leaks. The pipe grade is unknown. The actual stress, expressed as a percent of SMYS, is\n10.8% at 275 psig and 13.8% at 350 psig. This line is in a Class 2 location.\nThe 3 mile 2.375\" O.D. distribution stub was installed in 1966-67 with welded construction. This 0.15 4 inch\nwall thickness coated pipe is under cathodic protection and no leaks exist. The pipe grade is furnace butt-\nwelded with a 25,000 psi minimum yield. The actual stress, expressed as a percent of SMYS, is 8.4% at 275 psig\nand 10.7% at 350 psig. A portion of this line is in a Class 3 location.\nThe question which occurs in this upgrading procedure is whether or not a strength test is required. In OPS\nAdvisory Bulletin No.74-7 this question was asked. In this interpretation, OPS has said that a strength test\nmust be performed in accordance with Section 192.619 (a) (2) (ii) . However, in a later OPS Advisory Bulletin\nNo. 75-2 a question was asked about the interpretation in the Advisory Bulletin No. 74-7. Here OPS's\ninterpretation was that the term strength test was an overstatement of the requirement.\nCentral Illinois Public Service Company has requested a waiver but a waiver appears unnecessary. Having\nserved on the Technical Pipeline Safety Standards Committee when the standards were adopted, I do not\nbelieve the strength test was intended to apply to lines operating at a pressure that will produce a hoop stress\nless than 30% of SMYS. OPS' second interpretation that the strength test was an overstatement of the\nrequirement, appear more correct. We are advising Central Illinois Public Service Company with a copy of this\nletter that this distribution line can be upgraded without performing the strength test.\nSincerely,\nHarold E. Shutt\nChief Engineer - Gas & Electric","truncated":false,"body_characters":3774}