4
PENBERTHY
MODELS LL,LM, LH, ELL, GL, GH PLASTIC MATERIAL CONSTRUCTION JET PUMPS
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
FIGURE 1
Typical installation schematic liquid operated pumping liquids
FIGURE 2
Typical installation schematic gas operated pumping gases
Operating
liquid valve
Inlet
Discharge
Operating liquid
pressure
Suction
Foot valve
Operating
gas valve
Suction
pressure
(vacuum)
Suction
Discharge
Operating
pressure
Suction
check valve
5 OPERATION
5.1 Pre-operational check
1. Ensure that all installation procedures have
been completed.
2. Take all precautions necessary to handle
the possibility of leakage.
3. Ensure that any restrictions in the discharge
line have been removed.
4. Ensure that any discharge line valves are
fully open.
5. Ensure that the suction line valve, if
installed, is fully closed.
5.2 Operating
1. Open the operating liquid valve quickly.
2. On liquid applications, throttle operating
fluid flow, if possible, until desired motive
pressure is obtained.
3. Open the suction line valve, if any.
4. Regulate the discharge pressure as desired
to a value within the capability published in
the relevant technical data sheet or product
proposal referred to previously.
5. For pump priming applications, when
evacuation is completed, close the suction
valve and immediately start the centrifugal
pump. Then shut off the operating gas valve
to the jet pump.
Inlet
6 MAINTENANCE
WARNING
Maintenance should only be undertaken by
qualified, experienced personnel who are
familiar with this equipment and have read and
understood all the instructions in this manual.
DO NOT proceed with any maintenance unless
the jet pump has been relieved of all pressure
or vacuum, has been allowed to reach ambient
temperature and has been drained or purged of
all fluids. Failure to follow these instructions may
cause a sudden release of pressure resulting in
personal injury or property damage.
6.1 Preventative maintenance
The user must create maintenance schedules,
safety manuals and inspection details for each
specific installation of a jet pump.
On all installations the following items should
be evaluated regularly by the user for purposes
of maintenance:
1. Jet pump units for corrosion or debris
build up.
2. Piping and fittings for corrosion or debris
build up.
3. All connections for tightness.
4. Strainers for debris build up.
5. Units for wear.
The user must determine an appropriate
maintenance schedule necessary for his or her
own specific application, upon evaluation of
his or her own operating experience. Realistic
maintenance schedules can only be determined
with full knowledge of the services and
application situation involved.
6.2 Troubleshooting (see Table 2)
TABLE 2 - TROUBLESHOOTING
Problem
Cause
Solution
The suction flow is less than expected
1. Suction piping is too restrictive
1. Remove restriction
2. Discharge pressure is too high
2. Remove restriction
3. Operating fluid or gas pressure is lower than required
3. Increase pressure
4. Suction or motive liquid is at much higher than ambient temperature
4. Lower temperature or size larger jet pump
5. Suction piping leaks
5. Tighten fittings
