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Washington Administrative Code (Last Updated: November 23, 2016) |
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Title 296. Labor and Industries, Department of |
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Chapter 296-96. Safety regulations and fees for all elevators, dumbwaiters, escalators and other conveyances. |
Section 296-96-23325. What requirements apply to pressure tanks?
Latest version.
- (1) Tanks which may be subjected to vacuum sufficient to cause collapse must be provided with one or more vacuum relief valves with openings of sufficient size to prevent collapse of the tank.(2) Tanks must be provided with one or more gauge glasses attached directly to the tank and equipped to shut off the liquid automatically in case of failure of the glass. The gauge glass or glasses must be located so as to indicate any level of the liquid between permissible minimum and maximum levels and be equipped with a manual cock at the bottom of the lowest glass.(3) Tanks must be provided with a pressure gauge which will indicate the pressure correctly to no less than 1 1/2 times the pressure setting of the relief valve. The gauge must be connected to the tank or water column by pipe and fittings with a stop cock in such a manner that it cannot be shut off from the tank except by a stop cock. The stop cock must have a "T" or level handle set in line with the direction of flow through the valve when open.(4) Tanks must have a 1/4 inch pipe size valve connection for attaching an inspector's pressure gauge when the tank is in service.(5) Tanks must be equipped with means to render the elevator inoperative if for any reason the liquid level in the tank falls below the permissible minimum.(6) Tanks must be equipped with means for internal inspection.(7) Piping and fittings for gauge glasses, relief valves, and pressure gauges must be of a material that will not be corroded by the liquid used in the tank.