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When designing the pipe system, it is important to include following considerations:
How to keep air out of the system once operating. PD meters will run on air, but air is recorded as liquid and it may
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result in damage to flow meter. Presence of air is a contributing factor to 'water hammer' conditions.
Hydraulic shock can damage system components,
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either directly or as cumulative effect of many small
shocks. Design the system to avoid excessive
liquid velocity, long supply lines & sudden valve
closure.
Liquid expansion due to minor temperature
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changes can result in line pressure many times
normal, if relief valves are not installed. A thermal
relief valve is required in any system segment,
where the meter can be trapped between two
closed valves.
Direction of flow can be Left-to-Right, Right-to-Left
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or Up. The flow meter can face either up or out.
However, do NOT run this flow meter backwards
(see "Flow Direction Arrow" on meter case).
In critical process service, block valves and a bypass are recommended. This allows the flow meter to be serviced
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without interruption of flow.
Means for flow meter calibration should be included. This can be:
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A single connection to divert liquid into a proving can.
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A dual connection separated by a valve, to permit hook-up of a master meter.
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Future maintenance and service for both flow meter & strainer; both components can be serviced in-line, provided
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that there is room to work.
Typical TN Meter Installation
Inlet Valve
Thermal Relief Valve
Positive displacement (PD) meters are designed to operate full of liquid. The meter should be installed in a location,
where it remains full of liquid at all times. It may be installed in vertical lines, provide that liquid flows up.
Use a strainer on inlet side of PD meters, as protection against foreign particles. This strainer is not intended to clean
up general contamination, but to catch welding slag, pipe scale or similar, which might damage or jam the flow meter.
Protective caps installed in meter ports should be left in place, until you are ready to install in the
piping system. Before installation, check that no packing material has entered the flow meter.
Installation Instructions
Manual Bypass and Calibration Valve
3
Flow Direction
Arrow
Calibration
Screw
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Outlet Valve
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