257.0 Scope.

Every gas corporation engaged in the storage, terminaling, handling, transfer, vaporization or air-gas mixing of liquefied petroleum gas (LPG) within the State of New York shall comply with the rules set forth in this Part. Except where otherwise indicated, it is not intended that these rules be applied retroactively to existing installations or to those under construction as of the effective date of this order insofar as design, fabrication, installation or testing are concerned.#

This Part does not apply to:#

(1)design and fabrication of pressure vessels covered by the ASME Boiler and Pressure Vessel Code, section VIII, Pressure Vessels, Division 1(as described in section 10.3 of this Title);#

(2)proprietary items of equipment, apparatus or instruments;#

(3)heat exchangers; or#

(4)prefabricated units which employ plate and longitudinal welds, as contrasted to pipe.#

If a waiver of or deviation from the application of any rules prescribed in this Part is indicated because of special facts, application may be made to the Public Service Commission for waiver of or deviation from the rules and regulations in this Part. Each request shall include a full and comprehensive justification for such requested waiver or deviation, together with a proposed alternate rule to be considered for application to the condition(s) requiring the waiver or deviation.#