The Burks Vertical BKC Horizontal Stainless Steel Pipeline Centrifugal Pump

Introduction (from the manual)

The BKC and BKM pumps are horizontal single-stage centrifugal pumps, manufactured from stainless steel plate by advanced processes such as stamping, bulging and welding. They are compact, light in weight, energy-efficient, resistant to mild corrosion and low in noise, and can replace similar foreign products.

Model designation

Example BKC 80-65-200/22: BK is a stainless steel horizontal single-stage centrifugal pump, C is the close-coupled type (M is the coupling type), 80 is the suction diameter (mm), 65 is the discharge diameter (mm), 200 is the nominal impeller diameter (mm), and 22 is the motor power (kW). The manual covers both BKC (close-coupled) and BKM (coupling type); this page takes only the BKC close-coupled part.

Performance range

Typical applications

●Water supply: water filtration and transfer, district water supply, mains boosting, high-rise building boosting.
●Industrial boosting: process systems, cleaning systems, high-pressure washdown systems, fire-fighting systems, car washing.
●Industrial water supply: boiler feed, cooling systems, air-conditioning systems, air purification systems, aquaculture.
●Liquid transfer: oil and alcohol transfer systems, weak acids, weak alkalis, oil and alcohol treatment systems, ethylene glycol, coolants.
●Irrigation: area irrigation, sprinkler irrigation, drip irrigation.
●Sanitation systems: swimming pools, SPA.

Installation conditions

The pump must be installed horizontally. The following naming applies to the pump: when installed horizontally, the horizontal direction is the suction inlet (the medium enters the pump here) and the vertical direction is the discharge outlet. Installation details:
●The pump should be installed in a ventilated, dry and non-corrosive place.
●The pump inlet should be located where the water temperature is below 40 C.
●Ensure sufficient space around the pump for heat dissipation.
●The pump should be installed on a solid, flat surface.
●Fix the base on the foundation (cement foundation).
●Vibration dampers (rubber pads) must be installed.

Curve conditions

The following conditions apply to the performance curves:
●All tolerances comply with ISO 9906.
●The curves are based on a constant speed of 2900 rpm or 2950 rpm, 3 x 380 V.
●The test medium is clean water at 20 C, free of solid impurities, with a kinematic viscosity of 1 mm2/s.
●The curves are based on a kinematic viscosity of 1 mm2/s.
●When selecting a pump, choose by the pump's most frequently used duty point.

Operating conditions

●Pumped liquid: clean, thin, non-flammable and non-explosive liquid.
●Liquid temperature: minimum -20 C, maximum +100 C.
●Ambient temperature: maximum +40 C.
●Altitude: maximum 1000 m.
●Maximum system pressure: 10 bar.

Motor

The BKC (close-coupled) pump uses a totally enclosed fan-cooled two-pole motor with a custom shaft extension. Protection rating IP55; insulation class F; standard voltages at 50 Hz: 1 x 220 V and 3 x 380 V. (The BKM coupling type uses a standard motor and is outside the scope of this page.)

Minimum inlet pressure - NPSH

At maximum flow, if the inlet pressure is too low, cavitation¹ will occur inside the pump. To avoid cavitation, ensure the pressure at the pump inlet is at least Pb (bar). Note: NPSH must be calculated in the following five situations:
1. When the liquid temperature is high;
2. When the liquid flow is far above the rated flow;
3. When used in a low-pressure system;
4. When the suction lift is high;
5. When the inlet pipe run is long.
We recommend the following formula: H = Pb x 10.2 - NPSH - Hf - Hv - Hs. H = available maximum suction lift (m); Pb = atmospheric pressure (bar), which can be set by altitude (at 2000 m, Pb is 0.8 bar); NPSH = Net Positive Suction Head (m), judged according to the specific situation; Hf = suction pipe friction loss (m), at maximum flow; Hv = vapour pressure (m), determined by the liquid temperature and the Hv scale; Hs = safety factor, minimum 0.5 m. If the calculated H is positive, the pump operates at the maximum suction lift H; if the calculated H is negative, the inlet pressure must have at least a head of H.

Structure and main parts materials (BKC close-coupled)

Performance data

For the performance curves and performance data tables, and the installation dimension tables, of the BKC series (50-32, 65-40, 65-50, 80-65, 100-80, etc.) in detail, see the instruction manual.

Troubleshooting

1. The motor does not turn on starting - Cause -> Remedy: a. pump circuit failure -> check and repair; b. no power -> check the power supply; c. overload fuse (thermal protection) blown -> replace the fuse; d. loose or broken wire ends -> connect or replace; e. motor coil damaged -> rewind the motor coil or replace the motor; f. valve not fully open -> open the valve; g. impeller jammed -> clear the debris inside.

2. The motor starter overload trips when switching on - Cause -> Remedy: a. fuse blown -> replace the fuse or adjust the thermal protection; b. overload trigger contacts or cable connector failed -> replace the starter; c. loose power wiring or power fault -> re-tighten the power cable; d. motor coil failed -> rewind the coil or replace the motor; e. mechanical part of the pump blocked -> repair the mechanical parts of the pump; f. voltage too low -> report it to the relevant authority and improve the voltage.

3. The motor starter trips occasionally - Cause -> Remedy: a. the starter value is set too low -> reset it; b. periodic power faults -> check the power supply; c. circuit voltage too low -> check the power supply.

4. The starter has not tripped, but the pump does not turn - Cause -> Remedy: a. power fault or connector missing -> check the connectors; b. control circuit fuse failed -> repair the fuse; c. motor fault -> repair or replace the motor.

5. Uneven pump flow - Cause -> Remedy: a. pump inlet pressure too low -> correct the inlet pressure; b. suction pipe or pump partly blocked -> clean the suction pipe or pump; c. air entering the pump -> correct the inlet condition.

6. The pump runs but delivers no water - Cause -> Remedy: a. air in the suction pipe or pump -> fill with liquid and expel the air from the pump; b. inlet or outlet valve closed -> open the valve; c. suction pipe leaking -> repair the suction pipe.

7. The pump reverses when switched off - Cause -> Remedy: a. suction pipe leaking -> check the suction pipe; b. foot valve or check valve fault -> repair or replace.

8. Shaft seal leakage - Cause -> Remedy: a. shaft seal worn -> replace the shaft seal; b. mechanical seal position incorrect -> adjust the mechanical seal seat.

9. Loud noise - Cause -> Remedy: a. air entering the pump -> check the inlet condition; b. local cavitation inside the pump -> check the inlet condition.

Warranty

The product you purchased is warranted for one year; please note the following: 1. During storage, transport and installation, handle the product with care and avoid impact or crushing; keep the ambient temperature below 40 C and away from pollution and corrosion so the product works normally. 2. During the warranty period, if a product supplied by the company develops quality problems under normal use, the company will repair it free of charge; problems caused by improper dismantling or use are charged to the user. 3. After the product goes on the market, the company may replace product materials with more environmentally friendly ones; materials may change. 4. The product should be installed by professionals; when using and maintaining it, read this manual, especially the warning signs. 5. The product's origin and manufacturer are as marked on the nameplate. 6. Charged services outside the warranty period: repair fees, parts fees and transport fees. 7. When installing the product, users and dealers must not arbitrarily change the product's matching parts, to avoid affecting normal use. 8. Please understand that technical changes and printing errors may occur.