255.147 Flanges and flange accessories.

(a)Each flange or flange accessory must meet the minimum requirements of ASME/ANSI B16.5 or MSS SP-44 (as described in section 10.3 of this Title), or the equivalent.#

(b)Each flange assembly must be able to withstand the maximum pressure at which the pipeline is to be operated and to maintain its physical and chemical properties at any temperature to which it is anticipated that it might be subjected in service.#

(c)Each flange on a flanged joint in cast iron pipe must conform in dimensions, drilling, face and gasket design to ASME/ANSI B16.1 (as described in section 10.3 of this Title) and be cast integrally with the pipe, valve, or fitting.#

(d)Bolts or stud-bolts used shall extend completely through the nuts.#