An air gap , which deals with pipe trading, is an unobstructed vertical space between the drains and the flood level of the fixture.
A simple example is the space between a wall-mounted faucet and a rim sink (this space is an air gap). Water can easily flow from the faucet to the sink, but it is unlikely that water can flow from the sink to the faucet without modifying the system. This arrangement will prevent contaminants in the sink from flowing into the drinking water system by siphonage and is the cheapest form of flood retarding prevention.
The general use of the term "air gap" in a home pipe refers to equipment that provides backflow prevention for installed dishwashers. This "air gap" is visible on the table as a small cylindrical fixture is installed parallel to the faucet. Under the table, the dishwasher disposal pipe fills the "peak" air gap, and the "bottom" of the air gap is thrown into the sewer under the basket, or into the garbage disposal unit. When mounted and maintained properly, the air gap works as described above, and prevents water from the sink from the backup to the dishwasher, possibly contaminating the plate. Water that flows from the equipment to the sink indicates the need for maintenance or repair.
To illustrate the air gap further, consider what can happen if the air gap is removed by attaching the hose to the faucet and lowering the hose to the sink full of contaminated water. Under the right conditions (if the water supply loses pressure and the sink is higher than the point where the water supply goes into the house, for example), the dirty water in the sink will be sucked into the water pipe through the hose and faucet. The dirty water will then be scattered throughout the drinking water system.
Video Air gap (plumbing)
Standard and code
All plumbing codes require the prevention of backflow in several ways. Manufacturers of plumbing equipment build equipment to meet these codes. Builders may not establish cross-connections in their day-to-day work practices, and pipeline inspectors look for improper design or connection of piping and piping equipment. A common misconception is that "high loop" (channel routing of exhaust over sinking flood levels, for example) will provide the same functionality as the air gap; this is incorrect, since continuous connections in such cases will still allow backflow through siphon.
According to International Residential Code 2003 , the air gap must meet the requirements as two effective inner tube diameters (2 * D) to be sufficient.
The most widely used standards in the United States are:
- A112.1.2 Air Gaps in Plumbing Systems (For Plumbing and Water Connected Plumbing Equipment)
Maps Air gap (plumbing)
See also
- Hydrostatic circle
- Stress vacuum breaker
- Double check valve
- Chemotherapy valve
- The reduced zone zone device
- atmospheric vacuum breaker
References
Source of the article : Wikipedia
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