Okla. Stat. tit. 40, § 40-141.4: Application of rules and regulations

A. Twelve (12) months from the date upon which the rules and

regulations under this act become effective, all new boilers and

pressure vessels for use in this state shall conform to such rules

and regulations.

B. If a boiler or pressure vessel is of special design or

construction, and cannot comply with the construction requirements

of the rules and regulations of this act, a special installation and

operating permit may be granted by the Commissioner of Labor at his

discretion, provided the user presents evidence acceptable to the

Commissioner.

C. Welded steam lines - Downstream steam lines fabricated or

repaired by welding, operated at in excess of fifteen (15) pounds

per square inch gauge shall be fabricated, inspected and tested in

accordance with applicable rules and regulations.