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In the United States, traps are commonly referred to as P-traps. It is the addition of a 90 degree fitting on the outlet side of a U-bend, thereby creating a P-like shape (oriented horizontally). It is also referred to as a sink trap because it is installed under most sinks. Because of its shape, the trap retains some water after the fixture's use.
The Buchan trap was devised in the 19th century to stop the flow of sewer gases due to the miasma theory of disease. [1] For example, it was believed that the disease cholera was an airborne infection, not waterborne. The Buchan trap is normally found in the bottom of manholes or drop-shafts.
Vitrified clay pipe (VCP) is pipe made from a blend of clay and shale that has been subjected to high temperature to achieve vitrification, which results in a hard, inert ceramic. VCP is commonly used in gravity sewer collection mains because of its long life and resistance to almost all domestic and industrial sewage , particularly the ...
[8] [9] Clay pipes were later used in the Hittite city of Hattusa. [10] They had easily detachable and replaceable segments, and allowed for cleaning. Standardized earthen plumbing pipes with broad flanges making use of asphalt for preventing leakages appeared in the urban settlements of the Indus Valley civilization by 2700 BC.
An alternative to U-trap or siphon designs is to incorporate a counter-weighted trap door mechanism that provides an air-tight water seal in the closed position. [33] The addition of a small amount of water (generally less than 500 ml; 1 pint) overcomes the counterweight and allows the fecal matter to enter the pit. [34]
Grease trap sizing is based on the size of the 2- or 3-compartment sink, dishwasher, pot sinks, and mop sinks. Many manufacturers and vendors offer online sizing tools to make these calculations easy. The cumulative flow rates of these devices, as well as overall grease retention capacity (in pounds or kilograms) are considered.
A drain cleaner, also known as drain opener, refers to a person, device, or product used to unblock sewer pipes or clear clogged wastewater drains.This term typically applies to chemical, enzymatic, or mechanical tools such as commercial chemical cleaners, plumber’s snakes, drain augers, bio-enzyme solutions, or toilet plungers.
Skeet shooting is a recreational and competitive activity whose participants use shotguns to attempt to break clay targets which two fixed stations mechanically fling into the air at high speed and at a variety of angles. [1] Skeet is one of the three major disciplines of competitive clay shooting—alongside trap shooting and sporting clays.