Flomec D-40, Instruction Manual

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4 Installation
2.0 Mechanical Installation Prior to installing the meter check that :
•
The fluid is compatible with the meter materials of construction using appropriate information such as
fluid compatibility charts and site experience.
• The application and process conditions are compatible with the meter specifications. Minimum and
maximum flows are within the meter specified range including any in-situ cleaning processes. When
metering viscous liquids the maximum allowable flow may need to be reduced to ensure the pressure
drop across the meter does not exceed 100 kPa (1 Barg, 15 PSIG).
•
The process temperature and pressure does not exceed meter ratings.
•
The meter is not exposed to process temperatures and pressures that will cause the liquid medium to
gasify (flash) within the meter.
2.0.1 Flow Conditioning and Locations
Strainer : It is recommended to INSTALL a 100mesh (150 micron) strainer immediately upstream of (prior to) the
meter. Strainers are available from the factory.
Flow conditioning : The flowmeter does not require any flow conditioning, therefore straight pipe runs before or
after the meter are not required. If required, the pipe size around the meter can be altered to suit the installation.
Locations : The flowmeter is preferred to be fitted upstream of any flow control and/or shut off valve, this prevents
free discharge from the meter and minimizes the risk of drainage and air entrapment which can result in
erroneous readings or damage the meter on start up.
Process or safety critical meters should be installed in a by-pass section of pipe with isolation valves to enable the
meter to be isolated and serviced as required. A by-pass installation also allows purging of the system during
commissioning (see Commissioning).The meter must be appropriately rated and is typically located downstream
(on the discharge side) of the pump.
If mounted outdoors ensure a suitable watertight gland or plug is used to seal any open electrical entries. In
humid environments take precautions to avoid condensation build up within the electrical and/or instrument
enclosure. It is good wiring practice for conduits to be connected from the bottom of an entry port, in this way
condensation will gravitate away from any terminal housing.
Fluid state : Fluid entering the meter must remain a liquid at all times so protect the meter to avoid solidification or
gelling of the metered medium. If meters are to be trace heated or jacketed in any way the maximum temperature
rating of the meter must not be exceeded. Size the meter to avoid gasification of volatiles (flashing) within the
liquid due to the pressure drop experienced within the system or within the meter.
Hydraulic shock : If pressure surges or hydraulic shock of any kind is possible, the system upstream of the meter
must be fitted with a surge suppressor or pressure relief valve to protect the meter from damage. High frequency
flow pulsations can damage the meter. Such pulsations can be caused by the injection profile in diesel engines.
Most pulsations are removed with the installation of a suitable pulsation dampener.