ENCORE
®
700 METERING PUMP
the pump will not reprime itself due to compression and re-expansion
of the air trapped in the pump head.
If the system is installed in accordance with Dwgs. 440.400.110.030 or
440.400.110.040 (located in Section 2
-
Installation) using a backpres-
sure valve and/or pressure relief valve, the discharge drain valve may be
opened to allow the pump to prime against atmospheric pressure. Once
primed, close the discharge drain valve to resume normal operation.
If no backpressure and/or pressure relief valve are used, repriming is
greatly simplified if a three-way valve is installed in the discharge line close
to the pump outlet. This valve normally passes the pump output to the
downstream tubing or pipe. When repriming is desired, the valve is turned
to divert the pump output back to the liquid container, the downstream
pressure is blocked off, and the pump operates at atmospheric discharge
pressure. When a flow of liquid is observed returning to the source con-
tainer, the pump is reprimed. The three-way valve is then turned back to
its normal position and pump delivery can continue.
If an appropriate three-way valve is unavailable, the same result can be
achieved by using two conventional shut-off valves. One is placed in the
discharge line and other on the side opening of a tee located immediately
upstream of the line valve.
Hazardous Properties of Sodium Chlorite (NaClO
2
)
WARNING
: TO AVOID POSSIBLE SEVERE PERSONAL INJURY, AS THE
STORAGE AND HANDLING OF SODIUM CHLORITE PRESENTS VERY
SPECIFIC HAZARDS, THE USER MUST SEEK THE ADVICE OF THE CHEMI-
CAL SUPPLIER WITH REFERENCE TO STORAGE FACILITIES, HANDLING
PRECAUTIONS, AND HEALTH HAZARDS.
Sodium chlorite is a dry, flaked salt that, because of its powerful oxidizing
nature, is shipped in steel drums bearing a DOT "yellow" label classifica-
tion. It is stable when sealed or in solution, but is very combustible in the
presence of organic material. For this reason do not allow the solution to
dry out on floors. Mop up the solution with technical sulfite solution.
Technical sodium chlorite is a white, flaked salt with a density of approxi-
mately 56 lbs per cubic foot. It is a very powerful oxidizing agent.
Sodium chlorite in contact with acid will react with rapid evolution of
chlorine dioxide gas. When heated above 347°F, sodium chlorite will
decompose rapidly, liberating oxygen with the evolution of sufficient
heat to make the decomposition self-sustaining. If this decomposition
is confined, as in closed containers, the effect is explosive. Therefore, it
must be protected at all times from exposure to heat.
WT.440.400.001.UA.IM.1012
35
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