Hydrotech MP Series PULSAtron - Manual (Page 9)

9
PIPING
1. Use provided tubing of specified size for connection. Connect tubing securely to prevent leakage of chemical
and the entrance of air. Since plastic nuts are used for fittings, they should not be tightened excessively i.e.
hand tighten only. NPT suction and discharge valves must
NOT be overtightened. Hold fittings in place while
adding piping and fittings. NPT suction and discharge valves should only be tightened 25 to 35 in. lbs. (4.46
to 6.25 kg/cm).
2. If the air bleed valve assembly is being used, a return line (tubing) should be securely connected and routed
back to the storage tank.
To avoid possible injury from chemicals do not attempt to prime using a bleed
valve without installing a return line.
3. To maintain metering performance, a backpressure/injection valve is provided. The injection valve must be
installed in the discharge line. Best practice is to install the injection valve at the point of chemical injection.
4. If the discharge tubing is going to be exposed to direct sunlight, black tubing should be used instead of the
standard white translucent tubing supplied with each pump. To obtain, contact supplier.
5. To prevent clogging or check valve malfunction always install a strainer assembly to the end of the suction
tubing (Figure E). This footvalve/strainer assembly should always be installed 1 to 2 inches (2.5 - 5 cm) above
the bottom of the chemical tank. This will help prevent clogging the strainer with any solids that may settle
on the tank bottom. The chemical tank and footvalve/strainer should be cleaned regularly, to ensure continuous
troublefree operation. If the chemical being pumped regularly precipitates out of solution or does not dissolve
easily or completely (e.g. calcium hydroxide), a mixer should be used in the chemical tank. These are readily
available in many motor configurations and mountings. To obtain, contact supplier.
6. A flooded suction (tank liquid level always at a higher elevation than the pump) is recommended when pumping
sodium hypochlorite (NaOCI) and hydrogen peroxide (H
2
O
2
) etc. which are liable to produce air bubbles.
Maintaining a low liquid temperature will also help eliminate this problem.
7. Pipe corrosion can result if dilution at the injection point does not occur rapidly. This problem is easily
prevented by observing this simple rule: install injection fitting so that the end is in the center of the flow stream
of the line being treated. Trim injector tip as required. See Figure H. Note: Extended injection assemblies
are available for large water lines. Consult your supplier for more information.