Manual

◊ Do not install check valves or pressure reducing devices upstream of the meter.
◊ Valves immediately upstream of the meter should only be fully-open gate valves. Butterfly valves are acceptable if they
are 5 pipe diameters or more upstream from the meter. Downstream, fully open gate or butterfly valves can be used.
◊ The service saddle (or reducing tee), which is used for field accuracy testing, should be at least 2 pipe diameters
downstream of the meter's outlet flange.
◊ Unweighted check valves should not be located closer than 3 pipe diameters downstream of the meter.
◊ Externally weighted check valves and pressure reducing devices should not be located closer than 5 pipe diameters of
the meter.
◊ When installing a Turbo meter and plate strainer of a size smaller than the pipe installation, to reduce the effect of
jetting caused by the increase in flow velocity, a minimum of 5 pipe diameters of pipe equal in size to the meter, is
required upstream of the meter. Additional length is required if a sharp contraction or an eccentric reducer, rather than
a concentric, tapered reducer is used.
Installing the Meter
Overall dimensions and laying lengths of each meter size are listed in the Recordall Turbo Series Meter Product Data Sheet.
Review the dimensional requirements, choose an installation point in the piping, and proceed as follows:
1. Measure precisely the overall length of the meter with gaskets attached to the inlet and outlet ange connections.
2. Provide proper gap length in service piping.
3. Install meter in the pipeline so that the ow arrow on the meter housing points in the same direction as water ow.
4. With meter and gaskets in place, tighten ange connection bolts.
5. To relieve possible strain on the piping, position a meter support under the meter housing where appropriate.
TURBINE METERS MUST OPERATE IN A COMPLETELY FILLED LINE AT ALL TIMES. THE DOWNSTREAM PIPING MUST
ALWAYS BE ARRANGED TO PROVIDE SUFFICIENT BACK PRESSURE TO MAINTAIN A FULL LINE AT THE METER. BY
ELIMINATING AIR IN THE LINE, AS WELL AS SUDDEN FLOW SURGES, INACCURATE REGISTRATION AND DAMAGE TO THE
TURBINE MECHANISM CAN BE AVOIDED.
Performance Checks
Any valves or devices controlling the flow of water through a Turbo meter must always be opened and closed SLOWLY to
prevent shock loads that may damage the meter’s rotor assembly.
Complete the following checks to ensure that a Turbo meter is properly installed and operational:
• Slowly open the upstream valve to apply water pressure to the meter and check for leaks. Tighten the flange bolts as
required.
• Perform a functional test of the meter. Slowly open valve on downstream side of the meter to evacuate any air that may
have been trapped in the service line. When air has been eliminated, increase demand flow rate by further opening the
downstream valve or valves. Observe the register for correct direction of flow. Continue to open the demand side valves
to a flow rate sufficient to open the valve assembly in the meter—a procedure which will start water flowing through the
turbo high-side rotor. The high flow pointer will now move in the proper direction. Now open all applicable service valves.
• Check the flow rate to verify that the flow does not exceed the maximum continuous duty specification. The rate of flow
can be quickly checked by timing the quantity registered through the meter in one minute.
Recordall® Turbo Series Meters
Page 8 April 2014