255.507 Test requirements for pipelines to operate at less than 125 psig (862 kPa).

(a)Except for service lines, each segment of a pipeline that is to be operated at less than 125 psig (862 kPa) must be tested in accordance with this section.#

(b)The test pressure shall be 90 psig (621 kPa) or 1.5 times the maximum operating pressure whichever is greater; however, the maximum test pressure for plastic pipelines may not be more than two and a half times the design pressure for the pipe determined under section 255.121 of this Part, at a temperature not less than the pipe temperature during the test. During the test, the temperature of thermoplastic material may not be more than 100°F (38°C), or the temperature at which the material's long-term hydrostatic strength has been determined under the listed specification, whichever is greater.#

(c)The test medium shall be water, inert gas or air.#

(d)Except as provided in subdivision (f) of this section, the test must be conducted by maintaining the pressure at or above the test pressure for at least one hour after stabilization.#

(e)A calibrated pressure gauge that will indicate increments of two psig (14 kPa) or less shall be attached to the test section.#

(f)For plastic insertions of less than 1,500 feet (457.2 meters) length, the test duration may be 30 minutes prior to insertion followed by a 30-minute test after insertion and an inspection of all visible portions of the pipe for damage.#