Anderson Greewood Company — Pipeline Safety Interpretation

Page 1Mr. Frank Bright Anderson Greewood Company Box 400 Billaire, Texas 77401 Dear Mr. Bright: Mr. Buxton, Mr. Jack Baker and I had a conference on June 15 regarding testing of relief valves, Mr. Baker's position as Director of Codes is that a relief valve should be tested to the same specifications as a plug, gate or ball valve used in the same location. Briefly, this means, that valves 6" and smaller should have the same test as API-6D, 8" and larger shall be tested for 12 hours shell and 3 hours seat (if applicable), with pressure-temperature test charts submitted. In the case of ordinary valves the latter is referred to as a PL-203 test, and is an extra cost item. Mr. Buxton's information was that you relied on DOT paragraph 192.505 D92), using the prototype approach. We are interested in knowing whether other companies will accept this. Mr. Baker does not approve of this approach, instead would refer to paragraph 192.145. Please let us know your price schedule for a test that will match API 6D. I am enclosing a PL- 203 specification form. Much does not apply, but Section IV through 4.82 does seem to fit relief valves. Since this applies to 8" and up, please estimate such a testing cost. An early reply will be appreciated. Very truly yours, P.W. Nelson DB C:\WP51\INTERPRT\192\505\71-06-17 1#