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RP for Interstitial Tightness Testing of Existing Underground Double Wall Steel Tanks (R012)
Revised: Apr-2007  PDF Format

The purpose of this testing procedure is to meet the secondary containment testing requirements of the California State Water Resourses Control Board.


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The tests procedures are applicable to steel tanks built to both UL 58 and UL 1746 standards. This includes Type 1, type 2,  double wall storage tanks, and jacketed secondarily contained storage tanks.
Table of Contents; Scope, definitions, qualification of testers, code and testing references, explanation of external pressures, interstitial monitoring pipe, testing procedures 1, 2, and 3.


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