-
pressure reducing valves (PRV) only need to be installed when static line pressure in the water distribution system exceeds
585 kpa (85 psi)
-
Standard capacity PRVs are factory preset at..
344 kpa (50 psi) with adjustable pressure range from 172 kpa (25 psi) to 517 kpa (75 psi)
-
rotating disk meters are the most common household water meters. Tehy used for service pipe...
2" and less
-
style "3" meters, which come in sizes from....
1 1/2 " to 6"
-
turbine meters are good for a large flow of water and are frequently seen connected to the service for industrial pumps and equipment. this meter will not accurately register a flow rate below..
5 GPM
-
Compund meters are used with a water service larger than..
2"
-
if a perfect vacuum could be created in a piping system, it would be possible to back siphon to a height of..
10m (33.9m)
-
The principal causes of back siphonage are..
undersized piping 2 water main repair or break in the city or municipal water supply that is lower than a service point 3) lowered water main pressure due to high water withdrawl rate, such as fire fighting or water main flushing 4) reduced supply pressure on the suction side of a booster pump
-
the principle causes of back pressure are
- booster pumps
- potable water connections to boilers and other pressure systems
- interconnections with another system which operateds at higher pressure
- elevated piping, 9m 30' above finished grade
-
what should the size of an approved air gap be?
atleast twice the diameter of the inlet pipe, but never less than 25 mm or 1"
-
if if either check valve should leak, the differential pressure relief valve discharges water to the atmosphere to maintain a pressure differential of not less than..
14 kpa (2 psi)
-
any PVB that is 3" or larger has...
two check valves
-
An AVB is not normally installed more than _____ above floor level
1.2 m or 5'
-
what pressure is hot water tanks tested at?
300 psi
-
what are the boiling points of water at the folowing pressures 14.7 pounds,, 50 pounds,, 100 pounds
212 f,, 297 f,, 337 f
-
standard temp and pressure releif valve settings are
temp releif = 99 c or 210 .... pressure relief 150 psi 1050 kpa
|
|
