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In the U.S., every plumbing fixture must also be coupled to the system's vent piping. [1] Without a vent, negative pressure can slow the flow of water leaving the system, resulting in clogs, or cause siphonage to empty a trap. The high point of the vent system (the top of its "soil stack") must be open to the exterior at atmospheric pressure.
The return-stack heater was developed by the University of California and became commercially available about 1940. [ 8 ] [ 9 ] Filler caps have a three- or four-hole flue control. The stem into the pot usually has a piece of oil-soaked wood ("down-draft tube and wick") [ 10 ] secured inside the neck to aid in lighting the pot.
Great Western locomotives with their distinctive copper-rimmed chimneys The new-build steam locomotive Leviathan, a 4-4-0 with a large spark-arresting chimney. The chimney (smokestack or stack in American and Canadian English) is the part of a steam locomotive through which smoke leaves the boiler.
Either or both fuze wells may have firing devices screwed into them if required A stack of five M15 mines dating from the 1960s. The top two mines show additional fuze wells Side view of an M19 anti-tank mine , dating from the 1970s showing an additional fuze well on the side of the mine (sealing cap has been removed) designed for use with ...
Removal efficiency of pollutants is improved by increasing residence time in the scrubber or by the increase of surface area of the scrubber solution by the use of a spray nozzle, packed towers or an aspirator. Wet scrubbers may increase the proportion of water in the gas, resulting in a visible stack plume, if the gas is sent to a stack.
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In the United States, plumbing codes usually provide strict limitations on how far a trap may be located from the nearest vent stack. When a vent cannot be provided, an air admittance valve may be used instead. These devices avoid negative pressure in the drain pipe by venting room air into the drain pipe (behind the trap).
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