Water Meters

Question 1

What are the reasons for metering water?

Answer 1

Determine the cost of water produced vs. consumed
JUSTLY AND IMPARTIALLY

encourages people to use less water/be more frugal

Question 2

List the types of meters used in a water distribution system

Answer 2

Sonic Meter
Venturi Meter
Turbine Meter
Propeller Meter
Mag/Sonic Meter
Proportional Meter
Compound Meter

Question 3

Describe the accuracy and common usage for a POSITIVE DISPLACEMENT METER

Answer 3

Accurate at low flows

Used for residential units

Question 4

Describe the accuracy and common usage for a COMPOUND METER

Answer 4

Good for a RANGE of flows because it has a meter for low flows and high flows
Less accurate

Used for Hotels, Hospitals, Some businesses, Schools

Question 5

Describe the accuracy and common usage for a TURBINE METER

Answer 5

Accurate for High Flows
Easy serviceability

Used for Industry
Used for Sales from one community to another

Question 6

Label parts of a Positive Displacement meter

Answer 6

Meter Body, Calibrated Chamber, Spindle (counter), Ball, Disc

Screen, Disc, Register

Question 7

Discuss factors which must be considered in selecting meter size

Answer 7

Expected customer demand
Desired Pressure
Any friction in building (low pressure will not close toilets so they keep running)

Question 8

Discuss electrical continuity in relation to plastic water meters and the removal of a water meter (plastic or metal) from its setting

Answer 8

Make sure you have a “Continuity Yoke/Horn/Strap” or a grounding strap

Question 9

Explain what is involved in a meter test bench operation

Answer 9

Run water through meters
Have rotameter set up to see flow

Example: run 100g through
if meter says 98 g, that means it 98% accurate (not 2%)
If meter says 104 g, that means its 104% accurate

Question 10

Describe the items of information to be recorded on a water meter test card

Answer 10

Manufacturer
Type of Meter
Installation record (where its been)
Testing info/results - accuracy, date
Past Repair