Dallas Engineering, Inc. — Pipeline Safety Interpretation

Page 1January 24, 1974 Mr. Dois D. Dallas Petroleum Engineer Dallas Engineering, Inc. P.O. Box 594 Tioga, ND 58852 Dear Mr. Dallas: In your letter of January 17, 1974, you ask what protection should be provided for insulated 3/4- inch metallic riser pipes. Risers are to be coated and cathodically protected as required by Section 192.455. The level of protection must meet one or more of the criteria contained in Section 192.463. The frequency for monitoring service risers is covered by Section 192.465. We trust this answers your question. If you desire any further information, please advise. Sincerely, \signed\ Joseph C. Caldwell Director Office of Pipeline Safety dal\192\465\74-01-24 1#

Page 2DALLAS ENGINEERING, INC. January 17, 1974 Mr. Joseph C. Caldwell, Director Office of Pipe Line Safety Office of the Secretary of Transportation Washington, D.C. 20590 Dear Mr. Caldwell: Thank you very much for your letter amplifying the meaning of subpart I, #192.451. You state that metallic components of plastic pipelines are subject to these requirements. Accordingly would you please advise what protection should be provided for insulated 3/4" metallic riser pipes (service lines) which extend under ground for a total distance of not more than 3 feet? Very truly yours, DALLAS ENGINEERING, INC. Dois D. Dallas Petroleum Engineer dal\192\465\74-01-24 2#