Amco C700 Istruzioni per l'installazione e l'avvio - Pagina 2
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(6) Gradually open the upstream valve to allow water to pass through the meter.
(7) Observe that the register's sweep hand is turning clockwise in response to
the water throughput.
(8) Observe that the lowest value totalizer wheel advances one (1) number for
each complete turn of the sweep hand.
(9) When all the air has been expelled from the pipeline, close the downstream
faucet or fixture.
(10) Check all connections to detect leaks.
(11) Observe the low flow detector to identify downstream piping leaks.
COMPOUND METER START-UP
At start-up, the changeover valve is closed, diverting water through the bypass meter.
When 6.5 psi differential exists across the valve, with at least 13 psi pressure
downstream, the valve will open allowing water flow through the main line turbine
meter; however, water will continue to be measured by the bypass meter.
(12) With all valves closed, open slightly a downstream faucet or other fixture that
will demand water from the water main.
(13) Gradually open the upstream valve causing water to flow through the bypass
meter, and allowing the downstream piping to build up to at least
13 psi.
(14) Increase the rate of flow until the turbine meter register begins to measure
water.
(15) Observe that both meters are now measuring water.
(16) Reduce the rate of flow until the turbine meter register stops measuring
water.
(17) Observe that the bypass meter will continue to measure water.
(18) Close the downstream valve or faucet, and check all connections to detect
leaks.
(19) Observe the low flow detector to identify downstream piping leaks.
MAXIMIZING TURBINE AND COMPOUND METER ACCURACY AND REVENUE
Unlike positive displacement meters, horizontal turbines of all types can be adversely
affected by upstream turbulence. Good metering practices suggest that you consider a
length of straight pipe upstream, or the installation of AMCO's Z-Plate turbulence-
canceling strainer to maximize accuracy and revenue, as well as to protect the meter
from foreign matter and debris.
FIRE HYDRANT METER START-UP
It is recommended that a gate valve or fire hydrant valve be installed downstream to
control flows from AMCO's hydrant meter. After coupling the meter to the hydrant
outlet,
(20) Open slightly the downstream valve.
(21) Slowly pressurize the meter by opening the fire hydrant's main valve.
(22) After all the air has been expelled from the hydrant meter, close the
downstream gate valve.
January 2003
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