English (GB)
15
Suction lift system without foot valve
1. Connect an external vacuum pump to the vent
hole on the top of the pump casing.
2. Close the outlet isolating or throttle valve and
open the isolating valve in the inlet pipe.
3. Open the valves between the pump and vacuum
pump.
4. Start the external vacuum pump.
5. Pump until the inlet pipe and the pump are
completely filled with liquid.
6. Rotate the shaft by hand while priming and
venting to free entrapped air from the impeller
channels.
7. When the liquid runs out of the vacuum pump,
stop the external vacuum pump and close the
valves between the pump and vacuum pump.
4.3.1 Opening of valves
1. Open the valves for the flushing liquid to the
stuffing boxes.
2. Completely open the isolating valve on the inlet
side of the pump and leave the outlet isolating or
throttle valve partly open.
4.4 Startup
1. Start the pump.
2. Vent the pump during startup by loosening the
vent screw until a steady flow of liquid runs out of
the vent hole.
3. When the pipe system has been filled with liquid,
slowly open the outlet isolating or throttle valve
until it is completely open. Ensure that the
differential pressure developed by the pump is
within the performance range of the pump and/or
close to the designed duty point. Throttle the
outlet isolating valve or reduce the speed of the
pump if the flow exceeds the rated performance
range or the differential pressure is lower than
the rated performance range.
4. Adjust the stuffing box gland (stuffing boxes
only). With the pump running, tighten the stuffing
box gland to allow a leakage of 40-60 drops per
minute. This is required for shaft sleeve
lubrication. Tighten the stuffing box gland evenly
to provide uniform compression on the packing
rings. After initial startup, additional packing rings
and adjustment may be required until the packing
rings are properly seated.
5. Ensure the pump unit is operating smoothly
without abnormal noise, vibration or overheating.
Never let the pump run dry. The pump is
not self-priming.
Dry-running will cause serious damage to
the stuffing boxes, shaft seals, wear rings
and shaft sleeves.
Make sure that the pump is filled with
liquid. The pump must not run dry.
Dry-running will cause serious damage to
the stuffing boxes, shaft seals, wear rings
and shaft sleeves.
WARNING
Hot or cold surface
Death or serious personal injury
- Pay attention to the direction of the vent
hole, and ensure that the escaping
water does not cause injury to persons
or damage to the motor or other
components.
- In hot-water installations, pay special
attention to the risk of injury caused by
scalding hot water and hot surfaces.
- In cold-liquid installations, pay special
attention to the risk of injury caused by
cold liquids and cold surfaces.
Do not allow a stuffing box to run dry, and
do not overtighten the stuffing box gland to
eliminate leaking as the shaft sleeve will
become damaged.
