9. Once the desired high flow is established at an acceptable static pressure, do not adjust
the outlet valves. To lower the flow rate for additional testing, only adjust the input pump
speed to ensure the static pressure remains adequate for testing.
While applicable piping standards ensure that the resultant static pressure in the
Commercial and Industrial MACH 10 meters are acceptable in field installations, take care
during laboratory testing to ensure that prevailing static pressure in the test bench is not
artificially low. Such low pressures can lead to improper meter operation and poor meter
test results.
Neptune recommends the static pressure, measured at the meter outlet, is 30 psig or
higher especially during high-flow testing. If there are multiple meters on the same test line,
the pressure should be measured at the exit of the last meter. You can achieve this when
setting test flow rates by partially closing the outlet valves while increasing the input pump
speed.
Test Procedure
This section provides the steps to test the Commercial and Industrial MACH 10 meter.
1. Install the meter in the test bench with the flow arrow pointing downstream.
If you test more than one meter at a time, allow as much space between them as
practical, but at least a minimum distance equivalent to 10 pipe-diameters. As an
example, if testing 4-inch meters, make sure that a minimum of 40 inches (4 x 10)
is between adjacent meters.
2. Fill and flush the test line as described in "Test Bench Setup Procedure" on the previous
page.
3. Set the test flow rate while meeting the static pressure equipments as described in "Test
Bench Setup Procedure" on the previous page.
4. Allow the tank to drain, and then close the tank drain valve.
5. If you use a scale, which is recommended, set it to read zero.
6. Read and record the registered volumes from the Meters Under Test (MUT).
7. Start the flow of water. It may be necessary for the input pump to achieve desired
pressure before you open the downstream flow control valve. Be sure to observe
downstream static pressure requirements.
Commercial and lndustrial MACH 10
®
Ultrasonic Meter Installation and Maintenance Guide 27
Chapter 6: Testing the Commercial and Industrial MACH 10
®
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