Water Meters and Water Meters Bypass

Rotating Disk Meter

Sometimes referred to as "nutating" or nodding, this type is the most common small diameter water meter ranging in size from 1/2" to 2". It accurately register flow ranging from a 1/8 of a gallon per minute up to approximately 30 gallons per minute. The typical pressure loss for a 3/4" rotating disk water meter measuring and recording 20 gallons per minute will be 8 PSI. Water meters which are to be installed in freezing conditions have a bottom cap made of a material which is intended to break before the meter itself

freezes. The most common materials used in the construction of this breakable bottom plate are cast iron and plastic.

Turbine Water Meter

measure flow up to 27, 500 gallons per minute. These meters are usually installed to measure continually moving water flows, and will not register flow rates of less than 4 to 5 gallons per minute. The size of turbine water meters commonly offered by manufactures, ranges from 1 1/2" up to 20". The pattern of water flow through a turbine water meter is very straight. For this reason, pressure losses are very small. It is recommended that a flow strainer to be installed upstream of the meter. It provides protection against

damage to the turbine rotor from debris and also improves the efficiency of the meter by "straightening" the flow of water into the meter.

Compound Water Meters

is designed to measure and record both very small and very large flows. These meters are so constructed that they contain a turbine meter, and a rotating disc meter in the one casing. Small flows are registered on the rotating disc section, while large flows are registered on the turbine section.

Water Meter connections

Water meters ranging in size from 1/2" to 1 1/4" will use threaded connection. Some larger water meters of 1 1/2" to 2" diameter may connect into the water system by use of a flange connection or a female IPS and connection. Meters larger than 2" connect

into the water system by use of flange connection.

Water Meter Installation

7.6.1.3.(5)

Where the water supply is to be metered, the installation of the meter, including the piping that is part of the meter installation and the valving arrangements for the meter installation, shall be according to the water purveyor's requirements.

By-Pass

7.6.1.3.(2)

Except as provided in Sentence (3), a drain port shall be provided on the water distribution system immediately downstream of the building control valve required by Sentence (1) and if there is a meter, the drain port shall be installed immediately downstream of the meter on the water distribution system.