1. potable
    water which is safe for human consumption; any harmful bacteria has been killed by either chlorination or ultraviolet treatment
  2. public water main;
    the public (city, village or municipality) water supply system; the public employee responsible for this system is called the water purveyor
  3. corporation cock
    a shut off valve attached to the public water main; this valve is installed by city or municipal works crews
  4. curb cock
    a quarter turn plug cock installed at the property line; you activate a curb cock with a long T handle wrench
  5. water service pipe
    this pipe conveys water from the public water main or private water source to the inside of the building
  6. water service stop or shut off valve
    a shut off valve installed immediatleyly inside the building on the water service pipe
  7. pressure reducing valve
    a valve which reduces higher city pressures to the acceptable safe working limits of valves and appliances installed in the building
  8. meter
    a measuring device used to record water usage by a customer; it could be installed in a meter box at the property line or inside on the water service in a commercial building
  9. water distibution system
    this is the term applied to the total water pipe system from the water service stop (shut off valve) to all staops, valves, appliances and fixtures
  10. riser
    a water distribution pipe that extends through at least one full storey
  11. water pipe branch
    a pipe that supplies water from a main to a fixture or outlet, or an arrangement of pipe that supplies water to fixtures or outlets, with a maximum distance of seven meters to the furthest fixture or outlet
  12. water pipe main
    the principalartery to which the branches are connected
  13. service water heater
    a system for heating water for a water distribution system; these systems include electric  oil or gas fired hot water tanks, which have their own limited storage capacity, indirect water heaters, which require a boiler for the heating source, and tankless gas fired water heaters which give continuous hot water on demand
  14. temperature and pressure releif valves
    these valves are designed to relieve excessive temperatures and pressures that may be created in service water heaters; these devices must be installed on all service water heaters; the only rare exceptions are equipment manufacturers who have had their equipment exempted
  15. vacuuum relief valve
    this valve must be installed on every service water heater to protect the water heater fro collapsin, due to siphonic action that may be created if a city water main ruptures and there is a flow reversal of potable water; a vacuum releif valve is also needed to protect an electric service water heater, so that if the heater suddenly loses its water, the heating elements will not burn out
  16. shut off valves
     every water service pipe, water closet and service water heater shall be equippped with a shutoff valve
  17. hose bib
    every hose bib located on the exterior of a building shall be equipped with either a stop and waste valve on the inside of the building or a frost proof hydrant which will then replace the hose bib; these allow for drainage to prevent frozen pipes and fittings
  18. shower valves or bathtub valves with shower diverter
    these valves are installed at the same time as the water pipe rough in occurs; the diverter fitting does what the name implies, that is, it diverts water to the tu spout or to  the shower heat, depending on which way the lever is turned
  19. cross connection control devices
    these devices are designed to prevent back siphonage and back pressure of non potable water into the potable water system; cross connection control devices are generally used on commercial or industrial buildings
  20. backing
    support used by plumbers to hold pipes, fittings, shower and bathtub valves, fixtures, etc; backing must be strong enough to support the fixture, pipe, ect. with out movement or sagging; this material is usually 2x4, 2x6, 2x8
  21. cross connection
    a cross connection is any physical arrangement where a city or municipal water supply is connected, directly or indirectly, with any non potable or unapproved water systom which may containt harmful substances
  22. backflow
    back flow is the reverse flow of water or other liquids from any source into the potable water supply within a facility and/ or city or municipal water supply.
  23. back-siphonage
    is caused by negative presure or a reduced pressure in the supply piping.
  24. back pressure
    may cause backflow to occure when  the potable supply piping is conected to a system or fixture which exceeds the operating pressure of the potable supply piping.
  25. approved air gap separation
    an approved air gap is a physical separation between the free flowing discharge end of a potable water supply pipeline and the overflow rim of an open or non-pressure reciving vessel.
  26. nullify
    to deprive (something) of value or effectiveness; make futile or of no consequence.
  27. reduced pressure principle backflow prevention device (RPBD)
    used to protect the potable water system from extreme hazards which may be injurious to health. Best protection against backflow
  28. Double check valve assembly (DCVA)
    an effective device to prevent backflow caused by back pressure and back-siphonage and is used to protect the water system from substances which are not hazardous to health
  29. detector double check valve assembly (DDC)
    used to detect leakage or theft. its a hybrid version of a mainline DCVA with the addition of a smaller, factory-installed DCVA and a meter in a bypass configuration
  30. pressure vacuum breaker (PVB)
    pressure vacuum breakers are designed to only prevent back siphonage and cannot be used in an area where positive pressure can be developed on the downstream side of the device or in an area where the vacuum breakers are subject to flooding
  31. Atmospheric vacuum breaker (AVB)
    designed to only prevent back siphonage. its a device which allows air to enter the waterline when the line pressure is reduced to a guage pressure of zero or below.
  32. condensation
    the result of being made more compact or dence
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