APEC PUMP ST Series User manual

2
4” Plastic impeller and diffuser Submersible Deep Well Pumps
ST series
ORIGINAL OPERATING INSTRUCTIONS
1.Symbols used in this manual
Caution
Note
Warning
If these safety instructions are not observed , it may result in personal injury!
If these safety instructions are not observed , it may result in malfunction or damage to the equipment!
Notes or instructions that make the job easier and ensure safe operation.
4.Installation
Along its entire length the well diameter must be wide enough to allow for passage of the pump with clearance all
round. Handle the pump carefully;don’t drop it or let it fall.
THE safe movement of the equipment is on the user responsibility and any lifting operation must be car-
ried out by a suitably trained and qualified personnel.
When threaded connections are used,delivery pipes must be tightened to avoid any risk of the pump falling into the well
owing to unscrews.
It is advisable to connect the metal pipes to the threaded joints with
spot welding. With plastic pipes use proper connections.
A safety rope or chain of non-perishable material should always be used to se-
cure the pump.
Attach the power supply cables to the delivery pipe with cable clamps placed at in-
tervals of approx 3m.
Lower the pump into the well , making sure the feed cables are not damaged in any
way during the operation.
Never use the electric power cable to suspend the pump.
When the pump is operating , the delivery connection must be submersed at
least 1m below the deepest dynamic level of the well
Position the pump at a distance from the bottom of the well which will be sufficient
to avoid accumulation of sand or mud around the motor and to eliminate the risk of
overheating.
2.Operating conditions
For clean or slightly dirty water with maximum sand content : 50 g/m³.
Water temperature up to 60˚C.
Max starts per hour at regular intervals : 40 for 4” motors.
The electric data marked on the label are referred to the nominal power of the motor.
3.Delivery and storage
3.1Delivery
APEC submersible pumps should remain until they are to be installed.
During unpacking and prior to installation , care must be taken when handling the pump to ensure that misalignment
does not occur due to bending.
The pumps should remain in the packing until they are placed in vertical position during installation.
The loose data plate supplied with the pump should be fixed close to the installation site.
When the pump part and motor are supplied as separate units (long pumps) , fit the motor to the pump as described in
section Fitting the motor to the pump.
3.2 Storage and handling
The motors must be stored in a closed , dry and well ventilated location.
The pump should not be exposed to direct sunlight.
If the pump has been unpacked , it should be stored horizontally , adequately sup-
ported , or vertically to prevent misalignment of the pump . Make sure that the pump
cannot roll or fall over . During storage , the pump can be supported as shown in fig 1.
3.2.1 Frost protection
If the pump has to be stored after use , it must be stored on a frost—free location , or it
must be ensured that the motor liquid is frost—proof.
Fig. 1 Pump position during storage
1 control panel
2 power cable
3 level probes system
4 pressure gauge
5 non-return valve
6 delivery gate valve
7 inspection shaft
8 safety cable
9 delivery piping
10 built-in valve
11 pump
12 filter
13 well bottom
A changeable dy-
namic level.
Z total length of deliv-
ery piping ; if > 100m
install one or more
non-return valves.
Y depth of immersion ,
always > 1m.
X distance between
motor and well filter >
1m.
Caution
Note
Caution

3
The following components must be installed in the delivery pipe :
 A pressure gauge ;
 A check valve at max. 7m from the pump outlet and more lift-type check valves (5), depending on the type of
installation ( at least on every 50m in the straight vertical pipe above the pump ), to provide protection against
water hammering ;
 A gate valve to regulate delivery , head and absorbed power.
If the submersible pump is to be installed in the horizontal position , the following instructions must be followed:
 Install the pump with its axis placed at least 0 , 5m above the bottom of the sump , tank or container.
 Install a supplementary check valve , as the pump valve does not ensure a perfect seal in the horizontal position.
 The plant must allow for easy evacuation of the air when starting .
4.1. Motor cooling
If the well ( or tank ) has a diameter which is considerably greater than the pump width , it is necessary to install a
cooling flow shroud ( a flow inducer sleeve ), that is an external jacket to ensure a sufficient flow and water velocity
( V ≥0,08m/s for 4” , 0 , 16m/s for 6” ) to cool the motor.
5. Assembly of the pumps
The pumps are normally supplied with motor and pump disconnected.
Connect the coupling and pump-motor suction lantern. Clean the surface to be coupled. Put the suction
lantern of the pump in correspondence of the motor studs. Couple the grooved joint of the pump to the
motor shaft.
Screw in the nuts to the suction lantern, then fix them crosswise starting from the one opposed to the
cable as shown in the figure below. The torque recommended is 10Nm (for 4” motors).
Attach the cable to the pump with the cable guard and place the filter on the suction lantern.
Follow separate operating instructions (if available) of the motor.
6.Electrical connection
Electrical connection must be carried out only by a qualified electrician in accordance with local regulations.
Follow safety standards.
The unit must be properly earthed (grounded), also with a nonmetallic delivery pipe.
Make sure the frequency and mains voltage correspond with the name plate data.
Please follow the instruction of motor supplier for the motor electrical wiring.
6.1. Connection of cables
Feed cables have to be chosen on the basis of power , distance , voltage drop and temperature.
For connection of cables in the well , use thermo-shrinking insulation sheathes or other systems used for submerged
cables.
Before lowering the motor into the well , use appropriate instruments to measure continuity between phases and per-
form an isolation test between each single phase and the earth conductor.
7.Starting
Start the pump with the gate valve regulated to minimum aperture and wait until the delivery pipe is com-
pletely free of air.
With a three-phase motor make sure the direction of rotation is correct.
For this purpose , with the gate valve at half-open aperture position , check the pressure (with the pressure gauge) or
flow rate (sight check) after starting. Switch off power , reverse the connections of two phases on the control panel ,
re-start and check the pressure or flow rate capacity again.
The correct direction of rotation will provide a considerably greater and easily distinguishable pressure and delivery
capacity.
Make sure the sand residue present in the water disappears or is minimal.
Never start or run the pump when the gate valve has been opened too widely.
Make sure the pump operates within its rated limits of performance and that the rated absorbed cur-
rent is not exceeded.
Otherwise , regulate the delivery gate valve or the setting of any pressure switches.
7.1. Generator supply
The switching sequence is of utmost importance.
If you do not apply this correctly , both motor and generator may be damaged.
Therefore :
- Always switch the generator on and off without load!
This means :
- Starting : always switch the generator On first and the motor afterwards!
- Stopping : always switch the motor OFF first and the generator afterwards!
ATTENTION : Never run the pump dry , not even for a short trial run.
ATTENTION : Avoid long periods of operation with closed discharge.
8.Maintenance
Under normal operating conditions with clean water the pump will not require maintenance.
Absorbed current and head supplied by the pump must be checked at regular intervals.
This procedure should be carried out frequently when water contains considerable quantities of sand.
In the case of emergency systems , it is advisable to operate the pumps once a month in order to avoid the risk of
blocking and to maintain and verify perfect efficiency.
Disconnect electrical power before any servicing operation.
Caution

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ST-05,10,13,18,25

5
ST-05,10,13,18,25

6
ST-05,10,13,18,25

7
NO Description Photo NO Description Photo NO Description Photo
1 Discharge 24 Stop ring 52 Cable guard
2 Valve
casing
34 Strainer 86 O-ring
4 Valve
cone
36 Suction in-
terconnector
87 O-ring
6
Valve
retaining
ring
40 Pump shaft /
Coupling
88 Screw
8
Upper
bearing
spider
41 Shaft retain-
ing ring
89 Screw
12 Diffuser 42 Shaft sleeve 90 Washer
13 Bowl
42
A Shaft sleeve 91 Washer
18 Impeller 48 Casing 92 Bearing

8
ST-35, 40

9
ST-35, 40

10
ST-35, 40

11
NO Description Photo NO Description Photo NO Description Photo
1 Discharge 18 Impeller 52 Cable guard
2 Valve
casing
24 Stop ring 86 O-ring
4 Valve
cone
34 Strainer 87 O-ring
6
Valve
retaining
ring
36 Suction in-
terconnector
88 Screw
9 Adapter
ring
40 Pump Shaft/
Coupling 89 Washer
10 Bearing
spider
41 Shaft retain-
ing ring
90 Bearing
12 Diffuser 42 Shaft sleeve 92 Washer
13 Bowl 48 Casing

12
ST-55, 60

13
ST-55, 60

14
ST-55, 60

15
NO Description Photo NO Description Photo NO Description Photo
1 Discharge 18 Impeller 48 Casing
2 Valve
casing
24 Stop ring 52 Cable guard
4 Valve
cone
34 Strainer 86 O-ring
6
Valve
retaining
ring
36 Suction in-
terconnector
87 O-ring
9 Adapter
ring
40 Pump Shaft/
Coupling 88 Screw
10 Bearing
spider
41 Shaft retain-
ing ring
89 Washer
12 Diffuser 42 Shaft sleeve 90 Bearing
13 Bowl
42
B Shaft sleeve
92 Washer

16
ST-80

17
ST-80

18
NO Description Photo NO Description Photo NO Description Photo
1 Discharge 24 Stop ring 48 Casing
2 Valve
casing
34 Strainer 52 Cable guard
4 Valve
cone
36 Suction in-
terconnector
86 O-ring
6
Valve
retaining
ring
40 Pump shaft/
coupling 87 O-ring
9 Adapter
ring
41 Shaft retain-
ing ring
88 Screw
12 Diffuser 42 Shaft sleeve 89 Washer
13 Bowl
42
A Shaft sleeve 90 Bearing
18 Impeller
42
B Shaft sleeve
92 Washer

19
TROUBLE SHOOTING CHART
Problem Possible Cause of Trouble & Remedy
Pump will not run. 1. No power. Replace fuses or reset circuit breaker. Contact electrician if required.
2. Incorrect voltage. Contact electrician if necessary.
3. Incorrect fuses. Replace with proper fuses.
4. Defective pressure switch. Clean contact points or replace points.
5. Defective wiring. Check for loose or corroded connections.
6. Control box malfunction. Check wiring circuits and components. Correct wiring
and/or replace defective components. Press prong connectors to assure contact.
7. Bound or defective pump. Sand bound three phase units can sometimes be
corrected by temporarily reversing any two leads (except earth wire), running for 5
to 10 seconds, then returning to normal. Pull pump and repair if unsuccessful.
8. Defective cable or motor winding. Pump must be pulled and the motor or
electrical cable repaired or replaced.
Pump runs, but delivers
little or no water. 1. Check valve.
Reverse check valve.
2. Pump rotation wrong. For three phase units, swap anytwo leads (except earth wire).
3. Incorrect wiring. For three-wire single phase units, check wiring connections.
4. Leak in riser pipe. Raise pipe, check for leak and replace damaged section.
5. Pump screen blocked. Clean screen and reset at less depth. Bore may have to
be cleaned.
6. Air locked pump. Normal delivery may resume if pump is started and stopped at
one minute intervals.
7. Low water level. Throttle pump output or reset pump at lower depth if possible.
8. Worn pump. Pull pump and repair or replace.
9. Loose or broken motor or shaft. Check for damaged shaft if coupling is loose.
Replace worn or defective unit.
WARNINGS & SPECIFIC A TIONS
Allelectrical connections must be performed by qualified personnel working in accordance with
National and LocalElectrical Codes.
Check that the details on the pump's specifications plate correspond to your order.
Check that the pump has not been damaged during transit, paying particular attention to the electrical cables.
Never support the weight of the pump on the electrical cable.
Do not use these pumps in swimming pools.
Never run the pump dry - even briefly - as this will cause serious damage.
Onlyfor use clean, non corrosive and non-abrasive liquids.
Maximum sand content: 50gr/m3.
Maximum temperature of liquid to be pumped: 60°C.
Maximum time for running pump with gate valve closed: 2 minutes.
Maximum number of starts (at even intervals) per hour: 40.
Maximum voltage variation to motor: ± 10% of specified voltage.
Nameplate format

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Vol.PMVP-12071