TCS900004, Rev.4
07/12/2016
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Page 7
System Recommendations (Continued)
Control Valves
Safety and isolation valves should be used throughout the metering system. In any pumping system where
there is one (1) pump and multiple flow meters, a digital or hydro
-
mechanical Rate
-
of
-
Flow control valve
must be used at each flow meter to prevent over
-
speeding of the flow meters.
Best Plumbing Configuration
1)
The flow meter must be securely mounted to a riser or foundation.
2)
The inlet and outlet piping must be securely supported, in such a manner so as to avoid pipe stress on
the flow meter.
3)
The system should be designed to keep the flow meter full of liquid at all times.
4)
System piping should have full 4” pipe diameter throughout the metering system to allow for
minimal
pressure loss.
5)
The pipe should be laid out as straight as possible to reduce pressure loss from flow restriction.
6)
The meter and piping must be installed in such a way so as to avoid accidental draining of the meter.
The inlet and outlet of the meter should be lower than the associated system plumbing. This is known
as the sump position.
7)
It is not necessary for the air eliminator to be installed directly adjacent to the meter. It can be
installed upstream from the meter. For effective operation of the air eliminator, it should be mounted
between the meter and any valves, tees or any other potential places where air may enter the system.
8)
The metering system should include a means for calibration.
Protection From Debris
On new installations, care must be taken to protect the meter from damage during start
-
up. It is
recommended that a strainer be installed in the system upstream from the meter. The meter could be
subject to damage from the passage through of dirt, sand, welding slag or spatter, thread cuttings, rust, etc.
A spool can be fabricated and installed in place of the meter until the system is flushed. A spool is a
flanged length of pipe equal in length to the meter and any accessories attached to the meter such as an air
eliminator or control valve. Another method is to temporarily bypass the plumbing containing the meter
until the system is flushed. This will also protect the meter from debris. Once the system has run “clean”
for a period of time the meter may be reinstalled or protective means removed.
Thermal Expansion
Most liquids will expand and contract with temperature. In any system where there is a chance for liquid
to be captured between closed valves without relief, thermal expansion will likely occur. This can create
dangerously high pressures within the system. When product is trapped within the system, the pressure
will increase as temperature increases.
Care should be taken in designing the system in which thermal expansion may occur by implementing
Pressure Relief Valves or Thermal Expansion Joints in the system design.
