Series 1250 Pneumatic Chemical Injection Pump
Operating Manual
Page 6 of 19
CAUTION: Substantial scoring of the plunger can lead to severe leakage of chemical into the
surrounding environment.
Never re-locate the suction or discharge check valves away from the chemical head. To operate
properly, check valves must remain directly attached to the chemical head. If desired, a secondary
discharge check may be placed downstream of the primary discharge check valve.
DO NOT OVER-TIGHTEN THE PACKING NUT. Applying excess torque to the packing nut will decrease
the life of the packing.
Always remember to open the process block valve (shown as number 7 in Fig 1) prior to operating
the pump. Operating the pump with a closed block valve can generate enough pressure to rupture
the discharge line, permanently damage the block valve, or reduce the useful life of the pump.
1.2.2 Connect the chemical suction line to the suction check valve on the pump head. The suction check valve has
a 1/4” NPT male thread, with an arrow indicating chemical flow direction towards the pump (see illustrations at the
end of this Guide).
1.2.3 Connect your discharge line to the discharge check valve. This is a 1/4” NPT male thread. An arrow is stamped
on the discharge check valve pointing away from the pump.
1.2.4 Check that the packing nut is properly adjusted. In a new pump, proper adjustment is finger-tight, plus 1/6
of a turn. Use a packing adjustment tool (available from CheckPoint at no charge) for best results. IMPORTANT:
PLEASE REVIEW
Section 5.1: Packing Adjustment
on page 14.
1.2.5 Open the process block valve, allowing the process pressure to reach the chemical head. Correct any leakage
observed.
1.3 Connecting The Supply Gas
1.3.1 Gas supply to the pump should be clean compressed air or natural gas at 20 psig minimum, 200 PSIG
maximum. “Clean” means free of abrasive dust, sand or other grit that could abrade the seals inside the pump. The
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: The Series 1250 chemical head is rated for a maximum working pressure of 7,500 psig. At
air/gas supply pressures above 100 psig and ¼” or smaller plunger sizes, if blockage in the
discharge plumbing exists, pressures up to 18,000 or greater may be developed. A relief valve
must be placed between the discharge check and the process flow whenever: [supply air
pressure] x [amplification ratio]
≥
[discharge plumbing design pressure]
≥
7,500 psig. To find
the amplification ratio for your pump, please see Figure 2 on page 7.
CP/MAN-PRD-015 REV. 15 EFF. DATE: 07/08/2022