Section 193.2323 - Leak tests(a) Each container and piping system must be initially tested to assure that the component will contain the product for which it is designed without leakage.(b) Shop fabricated containers and all flammable fluid piping must be leak tested to a minimum of the design pressure after installation but before placing it in service.(c) For a storage tank with vacuum insulation, the inner container, outer shell, and all internal piping must be tested for vacuum leaks in accordance with an appropriate procedure.Wis. Admin. Code Department of Transportation § app 1 § 193.2323