OAR 340-170-0030
Underground Storage Tank Tightness Testing

(1)

UST tightness testing consists of testing the underground storage tank and associated piping and equipment routinely in contact with the ground for tightness against product leakage at normal operating pressures.

(2)

Tank tightness testing must be capable of detecting a 0.1 gallon per hour leak rate from any portion of the UST that routinely contains product while accounting for the effects of thermal expansion or contraction of the product, vapor pockets, tank deformation, evaporation or condensation, and the location of the water table.

(3)

Pipe tightness testing, for that piping not tested during the tank tightness test, must be capable of detecting a 0.1 gallon per hour leak rate at one and one-half times the operating pressure. Suction piping shall be tested at a positive pressure equivalent to one and one-half times the negative operating pressure.

(4)

The tank and pipe tightness testing report shall contain the testing equipment manufacturers written performance claims pertaining to the test used, and the manner in which these claims have been justified or tested by the equipment manufacturer.

Source: Rule 340-170-0030 — Underground Storage Tank Tightness Testing, https://secure.­sos.­state.­or.­us/oard/view.­action?ruleNumber=340-170-0030.

Last Updated

Jun. 8, 2021

Rule 340-170-0030’s source at or​.us