1.1.9 The pump suction line should be sized appropriately to the flow rate to avoid cavitatation. A general rule of
thumb is to size the suction line such that instantaneous flow velocity through the line does not exceed 2 feet per
second at any point. For multiple pump installations, for extremely viscous chemicals, and for chemicals with low
vapor pressures, additional allowances may be needed. Contact CheckPoint or your authorized CheckPoint
distributor for design assistance.
1.1.10 To avoid over-pressuring chemical discharge lines, a pressure relief valve must be placed between the
discharge check valve of the pump and the process flow. The pressure relief valve discharge must be run to a tee
upstream of the pump’s chemical suction check valve.
CAUTION: When using a pressure relief valve, chemical tank or vessel MUST BE properly vented to
atmosphere to avoid the possibility of over-pressurizing the tank if the pressure relief valve
actuates.
1.1.11 Pulsation dampeners may be required in your installation depending on a variety of factors. Consult with
CheckPoint if you have any concerns about pulsation.
1.2 Connecting The Chemical Supply
1.2.1 Clean suction lines and check chemical containers to ensure that they are free of all foreign matter, sand,
sludge, or chemical buildup.
NOTE: Removing foreign debris from suction lines and chemical containers will substantially extend the life
of the packing and other components of the pump. Even a new chemical tank can contain debris
that can be carried into the pump and damage it.
NOTE: CheckPoint recommends using filtration to ensure a maximum particulate size of 140 microns.
Multiple stages of filtration should be considered, depending upon the initial cleanliness level of the
fluid media being pumped, to prevent cavitation and an increase in maintenance.
NOTE: If premature scoring of the pump plunger or early packing failure is observed during operation, a
likely cause is abrasive particles carried into the pump through the suction plumbing. Use of a pre-
suction in-line chemical filter such as the CheckPoint Series FSTS and/or a ceramic or Hastelloy
TM
plunger is recommended if symptoms continue. Call CheckPoint for appropriate filter element sizing
criteria.
CAUTION: Substantial scoring of the plunger can lead to severe leakage of chemical into the surrounding
environment.
1.2.2 Connect the chemical suction line (3/4 or 1”) to the suction check valve on the pump head. The suction line
is underneath the pump and will be a ¾ or 1” SS compression tubing connection (see illustrations in the Parts List
Manual).
NOTE: Always apply Teflon™ tape or other appropriate thread sealant to the check valve threads prior to
attachment to prevent leakage.
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