Pulsafeeder Pulsa GLM DM1-6 - Manual (Page 6)

2
2.3 Piping System
Attention to piping detail will assure an easy startup and long life of your GLM
®
. Please follow these guidelines:
Suction Piping
Isolation Valve and Unions: Isolation valves allow
the system to be isolated from the process fluid to
facilitate safe servicing. They also aid in the operation
of Calibration columns. Valves should include good
visible indications of open/closed condition. Unions
assist with installation and maintenance. Valves that
integrate union fittings are ideal.
Strainer: Successful installations always include a
strainer on the suction side of the pump to exclude
material that can cause the check valves to
malfunction or the diaphragm to rupture. Select the
material, size and mesh to be compatible with the fluid
type, intended flow rate and service interval. A 100
mesh screen is generally recommended.
Calibration Column (Optional): Used to calibrate pump performance. Include an isolation valve and
vent line back to the supply tank to facilitate safe operation.
Pressure Gage (Optional): A pressure gage should be included on the suction side of the pump when
the suction pressure of the system is unknown or variable. The gage is also a good indicator of Strainer
maintenance status.
Discharge Piping
Discharge Pressure Gage: Install a pressure gage no less than 2 pipe diameters from the threaded
fitting on the discharge valve. A discharge pressure gage is critical to confirming proper operation of the
pump and setting the pressure relief and back pressure valves.
IMPORTANT: DO NOT Install an elbow directly into the discharge valve threaded fitting as it
will create excessive back pressure that can lead to premature diaphragm failure.
Pressure Relief Valve: Install a Pressure Relief Valve as close
to the pump as possible. Using the leg of a T fitting for this
purpose is acceptable (with the normal discharge taking the
straight path and the relief flow taking the leg). The relief
pressure must be set at or below the rated pressure indicated
on the pumps nameplate.
NOTE: Failure to install and properly set a Pressure
Relief Valve can lead to damage of the Pumps drive
mechanism that will not be covered under warranty.
Back Pressure Valve: Install a Back Pressure Valve to
generate a consistent Back Pressure to the pump for accurate
operation and to prevent siphoning.
Pulsation Dampener: Reciprocating diaphragm metering
pumps only discharge fluid for ½ of a pump cycle. A Pulsation
Dampener will smooth the associated flow/pressure variation to
the down stream process.
Figure 3: Discharge P&ID
Figure 2: Suction P&ID