Okla. Stat. tit. 40, § 40-141.5: Maximum allowable working pressure - Determination -

Exemptions - Special Permit.

A. The maximum allowable working pressure of a boiler stamped

with the AmericanSociety of Mechanical Engineers Code symbol or a

pressure vessel stamped with the American Society of Mechanical

Engineers or American Petroleum Institute - American Society of

Mechanical Engineers Code symbol shall be determined by the

applicable sections of the code under which it was constructed and

stamped.

B. The maximum allowable working pressure of a boiler or

pressure vessel which is not stamped and does not carry the ASME or

the API-ASME Code symbol shall be computed in accordance with

standard engineering practice using a factor of safety established

by rules adopted by the Commissioner of Labor.

C. This act shall not be construed as in any way preventing the

use, sale or reinstallation of a boiler or pressure vessel referred

to in subsection B of this section, provided the Commissioner of

Labor gives a specific ruling that such boiler or pressure vessel

conforms to its rules and regulations, and provided further, upon

inspection it has been found to be in safe condition.

D. If a boiler or pressure vessel is of historical significance

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.