Principles of sanitation applicable to the construction of new vessels.

Date:
[1949]
Catalogue details

Licence: Public Domain Mark

Credit: Principles of sanitation applicable to the construction of new vessels. Source: Wellcome Collection.

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    6. PLUMBING 6-1 SPECIAL EQUIPMENT 6.11 Air Gaps. An air gap is the unobstructed vertical distance through the free atmosphere between the lowest opening from any supply pipe or fixture drain and the flood-level rimof the receiving receptacle. An air gap should be at least twice the diameter of the delivery pipe or drain which is being protected. When a receiving funnel is provided, its vertical sides may be extended upward provided the gap 1S measured from the top of the extended side of the funnel to the end of the pipe or drain. (See Fig. 6) AIR-GAP AY LEAST TWICE THE PIPE DIAMETER Srapies geal | } SINK NON- POTABLE Ke oR BASIN LIQauips FUNNEL ' AIR-GAP FOR POTABLE WATER SERVICE LINES FIG.6 6.12 Backflow Preventers (Vacuum Breakers). When an air gap cannot be provided in the water supply line to a fixture, a suitable backflow preventer should be installed in the supply line on the discharge side of the control] valve and at least 4 above the flood-level rim of the fixture asshown in Fig. 7. The backflow preventer should be so designed POTABLE WATER FOOD EQUIPMENT HOSPITAL STERILIZER BACKFLOW PREVENTER (VACUUM BREAKER FLUSH OR HAN? OPERATED VALVE WF AiR-GAP FLOOD LEVEL RIM AT LEAST 4 WATER SEALED TRAP NON- POTABLE OR Pm CONTAMINATED Li@uips AIR-GAP IN WASTE FIG. 7 VACUUM BREAKER
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