The burks BKJ BKP BWP deep well pump

Model Designation

Example: 4 BKJ 02 06

4: for 4-inch (100 mm) wells;
BKJ: stainless steel Deep well pump; BKP: multistage stainless steel Deep well pump; BWP: multistage stainless steel hot spring pump;
02: rated flow (m³/h);
06: number of impeller stages.

Applications

burks deep well pumps are mainly used for pumping raw water from underground. The pump is installed in a borehole, lake or well and is submerged below the water surface. For industrial use, the pump can also be placed in a water tank.

BKJ, BKP and BWP pumps are suitable for the following applications:

• Raw water supply
• Irrigation
• Groundwater lowering
• Pressure boosting
• Fountain applications
• Mining applications
• Offshore applications
• Hot spring water applications

Features and Benefits

Full range of pumps
burks offers high-efficiency submersible pumps in a range of flow rates. The range covers many different sizes, and each size is available with a different number of stages so that it can be matched to the specific duty point.

High pump efficiency
Compared with price, people often overlook pump efficiency. However, attentive users will find that, in terms of the economics of water supply, price is of little importance compared with the efficiency of the pump and motor.

Example
Pumping water at a head of 100 m and a flow of 200 m³/h for 10 years with an ordinary pump consumes about 688,000 kWh of electricity. If the efficiency of the pump/motor is improved by 5%, you can save about USD 34,000 in energy costs (at a unit price of USD 0.10/kWh).

Materials and pumped liquids
To ensure suitable corrosion resistance and reduce corrosion, the pumps of this range are available in different steel material versions for different models.

Low installation cost
Stainless steel is light in weight, which makes the pump easy to handle, reduces equipment cost, and shortens installation and maintenance time.

Inlet strainer
The inlet strainer prevents particles above a certain size from entering the pump.

Non-return valve
Some pumps are fitted with a reliable non-return valve in the pump casing to prevent backflow that could stop the pump. In addition, the valve closes quickly, minimising the risk of destructive water hammer. The valve casing is designed to optimise the hydraulic characteristics, keeping the pressure loss across the valve as low as possible and thereby improving valve efficiency.

Priming screw
The pumps are fitted with radial impellers equipped with priming screws. The priming screw prevents dry running and ensures that the pump bearings are always lubricated. SP pumps with semi-radial impellers do not need a priming screw. The pump starts automatically. This applies to all pumps; however, if the water gauge position is below the pump inlet, neither the pump nor the motor can be protected against dry running.

High-efficiency motor
burks deep well pumps are equipped with high-efficiency motors.

Rewindable motor
burks submersible motors can all be rewound easily. The stator winding is made of special waterproof wire of pure electrolytic copper, wrapped in a special non-hygroscopic thermoplastic material. This material has excellent dielectric properties and allows the winding to be in direct contact with the liquid, so the winding is cooled more efficiently.

Industrial motor
For industrial applications, burks can supply a complete range of industrial motors developed specifically for demanding operating conditions. Compared with standard motors, these motors can withstand higher thermal loads and therefore have a longer service life under high loads. This applies to high loads caused by poor power supply, hot water, poor cooling conditions, high pump loads, etc. Note that motors for high-load conditions are longer than motors for standard conditions.

Lightning protection
burks recommends fitting additional lightning protection to reduce the risk of the motor being burnt out by lightning strikes.

Reduced short-circuit risk
The stator is enclosed in a stainless steel casing, and the stator winding is embedded in a polymer compound. This provides high mechanical stability and good cooling, and reduces the risk of winding short circuits caused by condensate.

Shaft seal
The shaft seal is a lip seal, characterised by low friction against the rotor shaft. The rubber has good wear resistance, good elasticity and good particle resistance. The material is ceramic/carbon, providing reliable sealing, wear resistance and long service life. The spring-loaded shaft seal has a large surface and a sand shield, which minimises the exchange between the pumped liquid and the motor liquid and ensures that no particles penetrate. The standard shaft seal is a ceramic/carbon mechanical shaft seal. The shaft seal is replaceable. The material has good wear resistance and can withstand particle abrasion. Together with the shaft seal housing, the sand shield forms a labyrinth seal that prevents sand from entering the shaft seal under normal operating conditions.

Operating Conditions

Minimum flow range
To ensure sufficient cooling of the motor, the pump must not run continuously at less than 0.1x the nominal flow rate. The pump must not be run against a closed valve for more than 30 seconds, otherwise the pumped liquid may overheat locally and damage the pump and motor.

Maximum flow range
The pump must not run continuously at more than 1.3x the nominal flow rate, otherwise surging and cavitation may occur.

Pumped liquids
burks pumps can pump clean, thin, non-corrosive liquids whose solid particles or fibres are no larger than grains of sand.

Special liquids
A high sand content will shorten the life of the pump. Pumps in special custom materials can be used to pump corrosive liquids. When pumping liquids denser than water, a motor with a correspondingly higher output must be used. Pumping liquids with a viscosity higher than water may lead to:

• Increased pressure loss
• Reduced hydraulic performance
• Increased pump power input

Liquid temperature
To protect the rubber parts of the pump and motor, the liquid temperature must not exceed normal (ambient) temperature. BWP hot spring deep well pumps can withstand liquids up to 90°C.

Cavitation

Cavitation does not normally occur in submersible pumps. However, if the following two factors are present at the same time, cavitation can damage pumps and motors installed at shallow depths:

• Entrained air bubbles
• A drop in back pressure caused by, for example, cracks in pipelines, severe corrosion of the main riser pipe, or extremely high consumption.

To calculate the installation depth required to prevent cavitation, use the following formula:
H = Hb − NPSH − Hloss − Hv − Hs
Hb = atmospheric pressure
NPSH = net positive suction head
Hloss = pressure loss in the suction pipe
Hv = vapour pressure
Hs = safety factor
If the calculated value of H is positive, the pump can operate at the given suction head. In this case, the standard notes on minimum installation depth apply.

Electrical Recommendations

We recommend using a soft starter or an autotransformer of 75 kW or above. Motors with star-delta starting should have a power of 5.5 kW or above.

Installation

System components: pump control protector, elbow, valve, well cover or clamping plate, rising main pipe, rope, cable, outlet, submersible pump working parts (inlet), submersible motor.

Installation depth (see the notes on the installation diagram): the installation depth of the pump must not exceed 70 m, and the distance between the pump bottom and the well bottom must not be less than 5 m.

Transport Notes and Warnings

Transport notes (Caution: risk of injury and damage!)

• Pay attention to the weight of the equipment during transport.
• When transporting by vehicle, make sure in accordance with the applicable rules that the equipment will not slip or tip over.

Crane transport

• Fix the lifting gear in the middle of the crane loading support bar.
• Danger: risk of injury from falling equipment. Observe local accident prevention regulations and safety instructions.
• Check the crane loading equipment for damage before each use of the crane for transport.
• Check the lifting gear for damage before each lifting operation.
• Only lift the machine on equipment intended for crane loading.
• Do not use lifting chains.
• Secure the lifting gear to prevent loads from unintentionally unhooking.
• Do not convey objects on the machine during lifting.
• Only persons trained in crane operation may use a crane for transport.
• Do not stand under heavy loads.
• Make sure no one stays within the danger zone of the crane.
• Do not leave equipment hanging on the crane unattended.

Warnings (Warning)

• burks accepts no responsibility and no liability for personal injury, equipment damage or any other property loss caused by failure to observe the contents marked in the operating instructions.
• Installers and operators must observe local safety rules. This product must be installed and maintained by professionals.
• The equipment must be fitted with a residual-current (leakage) protection device for safety.
• When installing and maintaining, cut off the power supply to the water equipment.
• If the cable is damaged, it must be replaced by a professional.
• This equipment must not be touched or used by children or non-professionals; burks accepts no responsibility for the consequences thereof.

Repair

If you ask burks to repair a pump, you must provide burks with specific information about the pumped liquid before returning the pump for repair. Otherwise, burks reserves the right to refuse to repair the pump. Any costs arising from returning the pump to the factory shall be borne by the customer. In any case, if the pump has pumped toxic or health-hazardous liquids, any service request (regardless of who bears the cost) must include detailed information about the liquid concerned. Clean the pump as thoroughly as possible before returning it.

Technical Data

For the performance curves, detailed data and pump dimensions of each model, see the instruction manual / selection catalogue.

The figure above shows the performance curves and outline dimensions of the 4BKJ series 1.5T (pump body diameter Φ96 mm, outlet 32 mm / 1.25″). The 1.5T series comprises 6 models (4BKJ1.507–4BKJ1.538) with power from 0.37 to 2.2 kW and maximum heads from 51 to 274 m, in 220V single-phase and 380V three-phase versions. The technical data section of the manual also includes the performance curves and data tables for the 4BKJ series 2T, 4T, 6T, 8T, 10T, 14T and 16T, the 4BKP/BWP series 2T, 3T, 5T, 8T and 14T, the 6BKP/BWP series 30T, 46T, 60T and 77T, and the 8BKP/BWP series 95T.

Warranty

Main points of the warranty card:

• This certifies that this product is covered by the company’s warranty and has passed strict quality control and inspection under the company’s quality management system.
• Please keep this manual properly; if it is lost, it will not be reissued.
• This product is warranted for one year from the date of purchase against non-man-made faults under normal use.
• After the warranty period, if parts need to be replaced, the cost of parts and service fees will be charged to the customer as appropriate.
• The company continuously improves its products; if parts must be replaced during the warranty period, improved parts may be used.
• The company accepts no warranty responsibility for faults caused by force majeure (such as low-temperature weather, earthquakes, floods and other natural disasters) or by human factors on the part of the user.
• This product must be installed and used by professionals; the company accepts no warranty responsibility for any fault caused by improper installation.
• Please test-run and inspect the product immediately upon delivery and acceptance; if you have any objection to product quality, raise it within one week, otherwise the company will not be responsible.