Pump Solutions Group Neptune GLYCOL FEED SYSTEM G-100-1A, G-100-2A - Manual (Page 10)

BRONZE ROTARY GEAR PUMP INSTRUCTIONS continued …….
Flow By-Pass
When a flow by-pass system is used to control output from the pump, the bypassed fluid should be directed back to the suction vessel to
avoid recirculation heat build-up. In cases where this is not possible, connect to the suction at least 10 pipe diameters length away from the
pump inlet. Provisions for cooling should be made in the event of recirculation heat build-up.
Pump Driver Mounting
Adapter kits (including bracket, coupling components, and hardware) are available for Bronze Close Coupled Gear pumps allowing
connectivity to NEMA and IEC motor frames. Assembly instructions are included with each kit. Adapterless motors, carbonator mounts, and
electric clutches are available for some models. Base mount kits (including baseplate, coupling components, coupling guard, and hardware)
are available for Bronze Pedestal Gear pumps. Contact your Oberdorfer representative for additional information.
OPERATION
Pre-Startup
Prior to start-up, recheck installation as described above. Verify desired rotation by jogging the motor and make corrections if necessary.
Before initial startup, pre-wet the gears and make sure the pump is adequately primed. Failure to do so could cause immediate damage to
pump components. Make sure that discharge valves are open.
Startup
Start pump and check for proper operation. Adjust packing (if applicable) as necessary, allowing adequate time to run in. Do not overtighten
the packing else damage to the packing and the shaft can occur. A properly packed and adjusted packing nut will leak at about 10 drops
every 3 to 5 minutes. Tighten packing nut only while shaft is rotating. Lip and mechanical seal versions require no adjustment. If the pump’s
bearing areas or seal area runs hot, shut the pump down and determine the cause. For units equipped with integral pressure relief valve, the
factory setting is usually 50 psig. It is recommended that the setting should be 5 psig above the operating pressure in the discharge line. To
increase the set point, turn the by-pass valve adjusting screw clockwise. If start-up screens were used, be sure they are removed prior to
placing the system into regular operation. Depending on suction conditions, it may be necessary to reprime the pump for subsequent restarts.
MAINTENANCE
Frequency
Since each installation differs, the frequency and extent of pump maintenance is best established based upon past performance. Keeping
detailed maintenance records of past performance aids in determining future preventative maintenance intervals. During routine operating
inspections, pay particular attention to seal and bearing areas of the pump. Consult the motor manufacturer for motor maintenance
instructions.
Changing Applications
Verify that all wetted parts of the pump are compatible with the new fluid to be handled and that the motor is adequately sized. Check with
your Oberdorfer distributor if in doubt.
Inspect for Wear
If your Bronze Gear Pump exhibits reduced flow, an inability to maintain pressure, is noisy or performs otherwise abnormally, first refer to
the Troubleshooting Matrix on back. If the problem persists, the pump should be inspected for wear or damage. Oberdorfer Bronze Gear
pump internals may be readily inspected in the field usually without removal from the drive or system plumbing. Simply remove the cover
screws to pull the cover. Full pump removal and complete disassembly may be needed for a comprehensive inspection. Contact your local
authorized distributor or the Oberdorfer factory.
BRONZE ROTARY GEAR PUMP INSTRUCTIONS continued …….