national multiple family submetering and allocation billing program ...

(2) Twisted or kinked flex supply line
- Should be a requirement within the standard as to materials resistance and integrity.
- Performance of the meter after a period of accelerated life testing
- Repeatability of test: tolerance of 0.6 percent as shown in Handbook 44 is too tight.
Repeatability test not applicable to ASME standard.
- Laboratory testing applies to more than one meter of a given model or type.
- In California, 3 of each meter model are currently tested based upon a random
selection from among 30 submitted.
- All meter orientations should be specified by the manufacturer and indicated on the
meter (A= all positions; H =horizontal positions, within 10 degrees; V = vertical
positions, within 10 degrees; I = inclined positions, at 30 degrees, 45 degrees, 60
degrees)
Conclusions based upon committee’s comments:
Several POU meter manufacturers propose that the current plumbing codes be modified
for several testing parameters, including levels of accuracy. These manufacturers are not
proposing to change the current accuracy standard of +/- 1.5% under ideal testing conditions.
They are proposing, however, that the accuracy level be changed for low flows and for the
impact of various adverse conditions such as meter orientation, temperature changes and piping
configurations to +3% to –5%. Table 8.1 summarizes their position in regard to the various
elements of the current ASME code for accuracy and testing parameters. The committee feels
that a plumbing standard is needed for POU meter installations and should consider using
AWWA M 6 manual, which covers utility meter installation. The manufacture must also specify
installation criteria.
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