Interpretation Response #PI-81-0110
Below is the interpretation response detail and a list of regulations sections applicable to this response.
Interpretation Response Details
Response Publish Date:
Company Name:
Individual Name:
Country: US
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Response text:
July 17, 1981
Mr. Edilberto C. Gamboa
Senior Vice President - Operations
First Philippine Industrial Corporation
P.O. Box MCC 967
Makati Commercial Center
Philippines 3116
Dear Mr. Gamboa:
This is in response to your letter dated June 24, 1981, concerning testing liquid pipelines.
Our regulations require only an initial hydrostatic test to 125 percent of maximum operating
pressure (MOP) for 4 hours and an additional 4 hours at 110 percent of MOP if the pipeline cannot
be visually inspected for leakage. The development of this regulation is contained in the enclosed
notice of proposed rulemaking and final rule.
Your letter mentioned transporting highly volatile liquids (HVL) . One requirement a we have in the
past imposed under §195.6 on operators transporting anhydrous ammonia that the water content be
monitored and water added, if necessary, to bring the water content to 0.2 percent by weight. We
believe this will combat potential for stress corrosion cracking in anhydrous ammonia pipelines.
Sincerely, Melvin A. Judah
Acting Associate Director
for Pipeline Safety Regulation
Materials Transportation Bureau
First Philippine Industrial Corporation
P.O. Box MCC 967
Makati Commercial Center
Philippines 3116