Pump Solutions Group Neptune Solenoid-driven Diaphragm Metering Pump ARPZ-31_61_12 - Manual (Page 10)

9
Installation
Piping
! CAUTION
• Connect the pipes to the pump properly.
• Do not connect the pipes above a passageway. Do not install the pipes where the chemical may splash
onto people even if the hose/tube should break.
• When using a pump with a relief-valve function, always attach a hose for relief purposes, and lead the
end of the pipe back to a tank or other container.
• When using a pump without a relief-valve function, be absolutely sure to install a relief valve on the
pipe right outside the pump on the discharge side. If the user has forgotten to open the valve or foreign
matter is clogged inside the pump’s discharge-side pipe, this may cause the pressure to rise above
the pump’s specifications range, liquid to gush out, the pipes to become damaged and/or the pump to
malfunction, all of which are dangerous.
• When using the pump in cold regions, the chemical may freeze inside the pump head or pipes, possibly
damaging the pump and its surroundings. Be absolutely sure to install a heating unit or heat-insulating unit.
• When the hoses/tubes become very hot, their ability to withstand pressure will deteriorate. When using
hoses/tubes available on the market, be absolutely sure to use the ones which are resistant to chemical
and which can withstand the temperatures and pressures under which the pump will be used.
• The durability of a hose/tube differs significantly depending on the chemicals with which it is used, on the temperatures
and pressures and on the presence of ultraviolet rays. Inspect the hoses/tubes, and replace them if they have deteriorated.
IMPORTANT
• Install a pressure gauge on the discharge-side pipe in order to measure the pressure at the discharge
side of the pump.
• Install the pump as close as possible to the tank. If the suction-side pipe is too long, cavitation* may
occur, possibly making it impossible to maintain the pump’s metering capability.
* Refer to the “Explanation of terms” on page 53.
Model Series Page
Model for injection of general chemicals PZ-31/61/12-VEC/VFC/FEC/FFC/FTC 10
Model for injection of boiler chemicals PZ-31-FEC (PP) 11
Model for injection of sodium hypochlorite PZ-31/61/12-CL 12
Model w/ automatic air-release function for injection of
sodium hypochlorite
ARPZ-31/61/12 13
■Pulsation
• The occurrence of pulsation will cause the pump’s hoses/tubes to vibrate. Secure the hoses/tubes so that they will not
swing about.
• In order to reduce pulsation, the installation of a damper is recommended. Ask a TACMINA representative for more
information.
■Pipe length
• An excessively long hose/tube may result in increased pressure loss, may cause the pressure to exceed the pump’s
allowable pressure, or may give rise to overfeed and/or cause pipe vibration.
• The pump comes with a 5-meter-long hose/tube for both the discharge side and suction side. If the pressure loss
exceeds the pump’s maximum discharge pressure, thicker pipes will be required. Provide details on the (1) viscosity
of the liquid, (2) length of the pipes (how they are positioned) and (3) specific gravity of the liquid to a TACMINA
representative.
■During maintenance
• When disconnecting the hose/tube for maintenance or other purposes and then reconnecting the same hose/tube, cut
about 10 mm off the end of the hose/tube before reconnecting.
• When conducting maintenance, release the pressure of the discharge hose/tube.
■When curving a hose/tube
• Provide a sufficient margin so that the hose/tube will not bend instead of curve round.
• Take steps to ensure that the hose/tube will not bend, rub against other parts, be cut or stepped on. Such actions can
damage the hose/tube.
• Take steps to minimize the number of tight curves in the pipes, joints and other parts that may restrict the flow.
The piping procedure will be described by pump type.
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