The Burks Vertical BKG BKP Silent Centrifugal Canned Pump

Model Designation

Take BKG 50 160 A as an example: BKG is the series code, 50 is the nominal diameter (DN), 160 is the impeller code and A is the trimming code. The series is available in the following six versions:

The stainless steel version means the motor outer cover is stainless steel; the pump casing is cast iron as standard. Please state at ordering if a stainless steel pump casing is required as a custom build.

Construction

This canned motor pump is of the enclosed-rotor type: the pump and the motor form a single unit with no shaft seal, only sealing gaskets. The bearings are lubricated by the pumped liquid. Its construction has the following features:

● Compact construction, small installation footprint, smooth running.
● Pump and motor are coaxial, giving steadier operation.
● The traditional shaft seal is eliminated, so the pump is leak-free.
● Sliding bearings replace rolling bearings, giving particularly smooth running.
● Pumps can be run in series or in parallel as required.

Materials

Installation

The pump must be installed with the motor shaft horizontal. Before starting, open the vent valve to vent the pump. Within a very short time the rotor forces the remaining air out through the shaft (never switch the pump on before it has been vented).

Motor

The terminal box is easy to use and provides cable terminals for various purposes; the cable entry is sealed. Connect in star (Y) or delta connection as required by the application.

Base

Pump bases vary: the bottom may be of square or claw type. Refer to the parameters of the corresponding model.

Pumped Liquids

Depending on the liquid type, the canned motor pump is designed for the following liquids:

● Thin, non-corrosive, non-explosive liquids containing no solid particles or fibres.
● Cooling water free of mineral oil.
● Domestic hot water.
● Softened water.
● Thin liquids.
● The anti-corrosion version can handle chemical media free of solid particles.
● The reverse-circulation version can handle liquefied gas and easily vaporised media.

The kinematic viscosity of water at 20℃ is 1cSt (1mm²/s). If the circulator is used with a higher-viscosity liquid, its hydraulic performance will drop. For example, 50% glycol at 20℃ has a viscosity of about 10cSt, and the pump performance falls by about 15%. The viscosity of the pumped liquid must be taken into account when selecting a pump.

Ambient and Liquid Temperatures

Liquid temperature: 0℃ to +100℃ (high-temperature builds up to 160℃ available). For standard pumps with an allowable liquid temperature of 0℃ to +100℃, the ambient temperature must always be lower than the liquid temperature, otherwise condensate will form inside the stator chamber. The relation between ambient temperature and allowable liquid temperature is as follows:

* Operation above these temperatures may shorten the service life of the pump.

Maximum System Pressure

PN 10: 1.0MPa (10 bar). PN 16: 1.6MPa (16 bar) (custom build).

Inlet Pressure

To avoid cavitation noise and damage to the pump bearings, maintain at least the following inlet pressure at the pump inlet:

Performance Range

This series covers nominal diameters DN40-DN350, flow rates of about 5.3-1080m³/h, heads of 10-125m, motor powers of 0.37-200kW and speeds of 970/1450/2900r/min. The per-model performance data form large tables and are not reproduced on this page; for detailed data please refer to the user manual / selection catalogue. The manual notes: the models listed are not all available models; more parameters and specifications can be customised.

Curve Conditions

Notes on the performance curves: 1. The bold part of a curve indicates the recommended performance range. 2. Test liquid: water free of air. 3. The burks canned motor pump curves apply to water with a density P=983.2kg/m³ at 20℃. 4. All curves show mean values and must not be taken as guaranteed curves; if a minimum performance is required, it must be tested separately. 5. The curves apply to a kinematic viscosity v=1mm²/S (1cSt). 6. The conversion between head H[m] and pressure P[kPa] is based on water with a density of 1000kg/m³. For liquids of other densities, such as hot water, the outlet pressure is proportional to the density.

Precautions

1. Read this installation and operating manual carefully before installation and use.
2. Any failure to observe the safety warnings may cause personal injury, pump damage and other property loss, for which the manufacturer accepts no responsibility or compensation.
3. Installers and operators must observe local safety regulations. This product must be installed and maintained by professionals.
4. The user must ensure that installation and maintenance are carried out by persons who know this manual well and hold professional qualifications.
5. Do not install the pump in a damp place or where it may be splashed with water.
6. Install the pump at a place with drainage facilities (such as a floor drain) to prevent water accumulation in case of leakage.
7. Disconnect the pump power supply during installation and maintenance.
8. Do not frequently replenish heating pipework with non-softened water, to avoid increased calcium in the circulating water blocking the impeller.
9. In winter, if the pump system is not running or the ambient temperature is below 0℃, drain the liquid from the pipework to prevent the pump casing from cracking in the frost.
10. In summer or at high ambient temperatures, ensure ventilation to prevent condensation and electrical faults.
11. The pumped liquid may be hot and under high pressure. Before moving or dismantling the pump, drain the liquid from the system or close the stop valves on both sides of the pump to avoid scalds.
12. If the vent screw is removed, hot liquid under high pressure will escape. Make sure the escaping liquid causes no personal injury or damage to other parts.
13. A damaged power cord must be replaced by a professional.
14. If the pump will not be used for a long time, close the valve on the inlet pipe and disconnect the power supply.
15. If a pump fault cannot be cleared following this manual, close the inlet valve and disconnect the power at once, and contact the dealer or service centre immediately.
16. Keep this product out of the reach of children; after installation, take isolating measures to prevent children from touching it.

Troubleshooting

Pump does not start

Power supply fault → Check the fuse, or the power connections may be loose
Jammed by impurities → Stop the pump, switch off the power, turn the rotor by hand, then restart
Rotor blocked by wound fibres → Stop the pump, switch off the power, turn the rotor by hand, then restart
Dirt inside the pump → Clean the inside of the pump

Noise in the system

Pump flow set too high → Partly close the outlet valve
Air in the system → Vent the system

Noise in the pump

Air in the pump → Vent the pump
Inlet pressure too low → Raise the inlet pressure, or check the air volume in the expansion vessel (if fitted)
Inlet/outlet valves not open, pipework and impeller blocked → Open the inlet and outlet valves and clear the blockage
Motor running in reverse → Correct the direction of rotation

Pump delivers no water

Air leaking into the suction pipe → Seal the pipework
Selected parameters too small → Select a larger pump model

Warranty

1. This certifies that the product listed is covered by our company’s warranty and has passed strict quality control and inspection under our quality management system.
2. Please keep this certificate properly; no replacement will be issued if it is lost.
3. This product is warranted for one year from the date of purchase against faults not caused by human factors under normal use.
4. After the above period, if parts need to be replaced, the customer will be charged the cost of the parts and a service fee.
5. Our company continuously improves its products; if a part must be replaced during the warranty period, an improved part may be used.
6. Faults caused by force majeure (such as cold weather, earthquakes, floods and other natural disasters) or by human factors of the user are not covered by the warranty.
7. Installation and use must be handled by professionals in accordance with the key points of use; the product must be installed in a ventilated, dry environment at an ambient temperature not exceeding 40℃, otherwise faults caused by improper placement are not covered by the warranty.
8. Please test-run and accept the product immediately after delivery; any objection about product quality must be raised within one week, otherwise our company will not be responsible.

Warranty Card

Dear customer: thank you very much for purchasing a burks product, and we sincerely wish you more joy and leisure from it. Please read and complete the warranty card carefully, so that during the use of this product you receive a reasonable and reliable guarantee and better service. Warranty card fields: pump model, production batch number, date of purchase, user name, address, telephone, stamp (stamp of the selling store).

burks keeps improving and innovating its products. If the appearance or technical parameters of a product change, the changed appearance and technical parameters shall prevail, and burks reserves the right to make changes.