24 Installation, Operations & Maintenance Manual
3.1 INITIAL START-UP
Before initial start up of the pump, check the
following:
FAILURE TO CHECK
TORQUE ON NON
METALLIC HEAD BOLTS PRIOR TO STARTUP AND
AFTER ONE WEEK OF OPERATION MAY EXPOSE
OPERATING PERSONNEL TO HAZARDOUS
LIQUIDS.
1. Check the torque on all non-metallic head bolts
prior to startup. After one week of operation,
reduce torque on all nonmetallic head bolts.
Torque the head assembly screws in a crosswise
pattern (Figure 16) as follows:
a) mRoy Model A Plastic Heads: 60–70 in. lbs.
(7-8 N-m) bolting torque.
b) mRoy Model B Plastic Heads:75–85 in. lbs.
(8.5-9.6 N-m) bolting torque, tie down nuts
25 in. lbs. (3 N-m).
2. Check the oil level in air bleed ller reservoir up
to or slightly above the indicated oil level.
3. Set the capacity control knob to approximately
30- 40% of maximum capacity.
4. Make certain that the suction line, liquid end
and discharge cartridge are lled with water or
system liquid.
5. Relieve all back pressure in the discharge line
and pump hydraulic system to allow air to purge.
Reduce pressure on the oil relief valve until air
is purged. Refer to “Start-Up after the Suction
System has Run Dry” section.
6. If practical, install a temporary discharge line
piped back to the suction tank incorporating
a 100 PSI (7 Bar) relief valve to facilitate
establishing performance during rst hours of
operation.
Priming
In order to prime the pump, it is necessary to
purge the liquid end (to release air) by
the bleeder valve (360). For toxic liquids, it
is recommended to collect this uid to safe
drain
point during this operation.
- First turn the pump ON
- Place the micrometer on the 50% posi-
tion, for 10 minutes.
- Untighten the bleeder valve (360) by
around 1/4 turn located on the liquid end.
Thus, the air trapped in the suction pip-
ing and the pump head can escape via the
drain. Wait until the liquid comes up to the
evacuation level of this drain. Let it ow for a
few seconds in order to degas it completely,
then retighten the drain plug.
On initial start up with 0% capacity, run
the pump for 10–20 seconds, then stop for
20–30 seconds. Repeat a few times in or-
der to ll the diaphragm oil cavity. Check for
proper motor rotation as described in general
installation instructions. During these short
runs listen for any abnormal motor or crank
noises, and if present, refer to Section 5,
Troubleshooting.
Run pump for 1/2 to 1-1/2 hours to warm up oil.
Check discharge line for indication of ow.
Increase capacity adjustment setting to 100% of
capacity and operate for 10–20 minutes.
DO NOT SET THE
CAPACITY ADJUSTMENT
KNOB IN EXCESS OF 100% BECAUSE ERRATIC
OR REDUCED METERING WILL DEVELOP.
Reduce capacity adjustment setting to 30–40%
of maximum capacity and operate for several
minutes, then increase capacity adjustment back
to 100% for approximately 10 minutes. Repeat
several times to insure that the air is bled from
the pump displacement chamber and the liquid
end. (As a general rule, to bleed air or vapor from
the pump oil displacement chamber reduce the
capacity adjustment to the 20 to 40% range, and
to bleed air or vapor from the liquid end increase
SECTION 3 - OPERATION
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