Interior Design Fittings and Fixtures - Plumbing
Plumbing Fixtures Continued
Induced Siphonage
Induced Siphonage is the loss of water from a trap caused by a reduction in pressure at the outlet of the trap. This condition is normally caused by flow from fixtures connected to the same pipe but at a higher level. Negative pressure is created in the pipe from the excessive flow from a higher fixture. Think of siphonage, as a form of suction or a common example is the pressure used to siphon fuel from the petrol tank of a car.
Self-Siphonage
Self siphonage is similar but caused by the long leg of the pipe being long enough to create a suction or siphon. The actual air pressure being greater than the pressure in the pipe essentially causes the siphon effect. When the pipe is full of fluid and moving, there is no compensating air, then the water seal will get sucked, pushed or siphoned into the waste pipe. There are now self-venting traps that allow air into the system to stop the siphoning effects.
Vents
These are the items that allow air into the system to balance and stop the water seals from siphoning themselves out and allowing noxious gas into the living areas. They eliminate the positive and negative pressures exerted by fluid flowing in the pipes. Other benefits that vents provide are reducing the corrosive gases on metal piping and letting foul gases out of the system.
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