A. All pipe and pipe fittings, including valves, gauge class fittings, and other similar appurtenances used in connection with any derrick, loading rack or tank, shall be designed, installed and maintained to safely withstand the pressure to which they may be subjected.
1. All valves directly controlling the flow of inflammable liquids from tanks shall be of the rising stem or self-indicating type, or other type commonly used in oil field operations which is equally adequate or efficient. Provided, however, that this provision shall not apply to valves less than two inches in diameter.
2. Gauge glass fittings for tanks and for containers, sample cocks and other similar fittings intended or used for the purpose of drawing off inflammable liquids from tanks and/or containers, in any quantity shall be constructed of some metal having a melting point equal to steel or higher.
3. Gauge glass fittings shall be equipped with automatic ball checks.
B. Any system of piping connected to a positive acting pump shall be equipped with an automatic pressure relief valve or suitable means to relieve the pressure of any such system and prohibit such pressure from exceeding 125% of the normal safe working pressure of the piping system or pump, whichever is the lower pressure.
C. All electrical equipment proposed to be used, or used, in connection with any permit issued hereunder shall conform to the State Electrical Safety Orders of the Industrial Accident Commission.