Chapter 1. Commissioning
PELLERIN MILNOR CORPORATION
protection against harmful dribble which occurs later—when the machine is no longer in use.
One foolproof solution for “dribbling” is to completely purge the appropriate chemical injection
tube with fresh water after every injection, so that only fresh water (which cannot cause a
problem) can dribble out.
Obviously, it is the sole responsibility of the pump and/or chemical supplier (not the machine
manufacturer) to furnish such a flushing device. (We understand that such flushing type
chemical injection systems—both for retrofit to existing systems and for new installations—are
now offered by others.)
1.3.2.
Locating Chemical System Components to Reduce the Risk of
Internal Damage
If the tubes, pumps, and chemical tanks are kept well below the injection point, the likelihood of
“after-hours dribbling” is reduced, but not totally eliminated.
We therefore urge that tubes from any non-flushing pumped chemical system be connected as
shown in Figure 5. Although fresh-water flushing the just-used tubes after each injection would
be better, we believe routing the tubes as indicated will probably minimize the dribbling effect
about as much as possible without flushing. Never permit tanks, pumps, or any portion of the
tubes to be higher than the injection point. If loops in the injection tubes are employed, make sure
the entire loop is well below the injection point.
Figure 5: Proper Routing of Chemical Tubing
Note 3:
As shown in Figure 5, all tanks, pumps, and tubing must be lower than the injection point on the
machine and must not dribble chemicals into the machine, nor leak chemicals externally onto any portion
of the machine or its surroundings.
1.3.3.
Preventing Leaks Which Can Injure Personnel and Cause
External Damage
Any ports on the inlet are plugged at the Milnor
®
factory. When replacing plugs with fittings or
when reinstalling plugs, always use the sealant furnished (LocTite
®
RTV Silicone Adhesive or
equivalent). Use properly sized hose barbs, always use clamps, and check for leaks. Use the hose
barbs furnished with your machine only if they provide the proper fit for the tubes employed.
Ensure that excessive pressures cannot build up that might burst or disconnect tubing. Instruct the
operator to monitor for leaks and report any occurences.
