Milnor 36026X8J, Installation And Service, Page: 22 / 126

Avoiding Damage From Allied Remote Chemical Delivery Systems
PELLERIN MILNOR CORPORATION
Figure 3:
Dribbling From Chemical Supply Line Into Machine
(assumes positive closure at the pump)
Examples
Legend
D. Portion of supply line, the contents of which can dribble into the machine
P. Pump
T.
Chemical tank
3.
Design and Installation Recommendations
It is the responsibility of the chemical system manufacturer and supplier to use whatever
measures are necessary to ensure that their system is safe for personnel and equipment.
The
following are some of the possible methods the manufacturer or supplier may wish to use, as
appropriate.
3.1.
Siphoning: Positively close the line.
—If the pump does not provide positive closure
when the system is off, employ a shutoff valve in the line to serve this purpose.
3.2.
Siphoning: Break the siphon.
—Provide an air gap or vacuum breaker in the chemical
delivery line. This must be located above the “full” line of the tank.
3.3.
Dribbling: Flush the entire chemical delivery line.
—If any concentrated chemical
that remains in the injection line between the pump and the machine is free to flow into the
machine, employ a system that flushes the entire line between the pump and the injection point
with fresh water after each injection.