18-29-713.7 Central vacuum or disposal systems.

   Where the waste from a central vacuum (fluid suction) system of the barometric-lag, collection-tank or bottle-disposal type is connected to the drainage system, the waste shall be directly connected to the sanitary drainage system through a trapped waste.

18-29-713.7.1 Piping.

   The piping of a central vacuum (fluid suction) system shall be of corrosion-resistant material with a smooth interior surface. A branch shall not be less than 1/2 inch (12 mm) nominal pipe size for one outlet and shall be sized in accordance with the number of vacuum outlets. A main shall not be less than 1 inch (25 mm) nominal pipe size. The pipe sizing shall be increased in accordance with the manufacturer's instructions as stations are increased. For the purposes of inspection, maintenance and replacement, all piping shall have cleanout facilities on mains and branches. Access shall be provided to such cleanout facilities.

18-29-713.7.2 Velocity.

   The velocity of airflow in a central vacuum (fluid suction) system shall be less than 5,000 feet per minute (25.4 m/s).

18-29-713.8 Vent connections prohibited.

   Connections between local vents serving bedpan washers or sterilizer vents serving sterilizing apparatus and normal sanitary plumbing systems are prohibited. Only one type of apparatus shall be served by a local vent.

18-29-713.9 Local vents and stacks for bedpan washers.

   Bedpan washers shall be vented to open air above the roof by means of one or more local vents. The local vent for a bedpan washer shall not be less than a 2-inch-diameter (50 mm) pipe. A local vent serving a single bedpan washer is permitted to drain to the fixture served.

18-29-713.9.1 Multiple installations.

   Where bedpan washers are located above each other on more than one floor, a local vent stack is permitted to be installed to receive the local vent on the various floors. Not more than three bedpan washers shall be connected to a 2-inch (50 mm) local vent stack, not more than six to a 3-inch (75 mm) local vent stack and not more than twelve to a 4-inch (100 mm) local vent stack. In multiple installations, the connections between a bedpan washer local vent and a local vent stack shall be made with tee or tee-wye sanitary pattern drainage fittings installed in an upright position.

(Amend Coun. J. 11-8-12, p. 38872, § 259)

18-29-713.9.2 Trap required.

   The bottom of the local vent stack, except where serving only one bedpan washer, shall be drained by means of a trapped and vented waste connection to the sanitary drainage system. The trap and waste shall be the same size as the local vent stack.

18-29-713.9.3 Trap seal maintenance.

   A water supply pipe not less than 1/4 inch (6 mm) in diameter shall be taken from the flush supply of each bedpan washer on the discharge or fixture side of the vacuum breaker, shall be trapped to form not less than a 3-inch (75 mm) water seal, and shall be connected to the local vent stack on each floor. The water supply shall be installed so as to provide a supply of water to the local vent stack for cleansing and drain trap seal maintenance each time a bedpan washer is flushed.

18-29-713.10 Sterilizer vents and stacks.

   Multiple installations of pressure and non-pressure sterilizers shall have the vent connections to the sterilizer vent stack made by means of inverted wye fittings. Access shall be provided to vent connections for the purpose of inspection and maintenance.