Pulsafeeder PULSAtron Series MP EN - Manual (Page 10)

10
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 over tightened. 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 foot valve/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 foot valve/strainer should be cleaned regularly, to ensure continuous trouble free 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.