Installation of centrifugal pump

Installation of a centrifugal pump should be carried out in accordance with the project and manufacturer's instructions. Below are general recommendations for the installation of all types of pumps with air-cooled motor.

• Pumps with a power of up to 1 kW with in-line connection to the pipeline can be installed on a horizontal or vertical pipeline without an support frame or foundation, if not provided by the project or installation instructions.
• Pumps with a power of 1 to 5 kW are installed on a steel frame, and pumps with a larger power on a concrete foundation, if not otherwise specified in the installation instructions.
• The weight of the foundation should exceed the weight of the pump with the motor by at least two times. The edges of the foundation should protrude beyond the boundaries of the support frame around the perimeter by at least 100 mm.
• The distance from the end of the motor to the nearest enclosing structure should exceed 500 mm.
• Thermal insulation is carried out only for the pump housing and connecting pipes. Thermal insulation of the motor is not allowed.
• Before connecting the pipes to the pump, turn the shaft by hand, having previously removed the protective cover. The shaft should rotate freely.
• Before installing the centrifugal pump, the supply and discharge system pipes should be flushed.

Pipe connection

• The pump casing should not be subject to loads from connected pipelines.
• The arrow on the pump casing should match the direction of water flow at the installation location.
• A shut-off valve, anti-vibration inserts, and pressure gauges should be installed on the suction and discharge pipelines, and a strainer should be installed on the suction pipeline.
• If two or more pumps are installed in parallel on the discharge pipe, each one should have a check valve installed on its discharge pipe.
• A drain valve should be installed at the lowest point of the section disconnected from the pump.
• The flanges should be parallel, gaskets made of material that matches the properties of the pumped liquid should be installed between the flanges, and washers should be installed under the nuts and bolts.
• The diameter of the suction and discharge pipelines should be selected by calculation and usually exceed the diameter of the pump nozzles by 1-2 pipe sizes, so transitions should be installed on the suction connections to the pump. The diameter of the shut-off valve, anti-vibration inserts, strainer, and check valve should be selected based on the diameter of the pipelines.

Requirements for the room

• The temperature in the room should not drop below 0°C or exceed 40°C. If the manufacturer's instructions allow for pump installation outdoors, measures should be taken to protect it from atmospheric precipitation and direct sunlight.
• The room where the pump is installed should be equipped with a ventilation system that operates continuously throughout the pump's operation. The volume of supply air should be sufficient to dissipate heat from the electric motor.

Electricity

• The pump casing should be grounded.
• The terminal box should be protected from water ingress.
• Installation of the pump where the terminal box or electric motor is located below the casing is not allowed.
• Pumps resistant to blocking currents and pumps with built-in winding protection against overheating do not require additional motor protection.

Sequence of packing a threaded connection

1. Take a bundle of flax thread with enough strands so that when twisted, its diameter is approximately equal to the depth of the thread on the mating element. The length of the bundle should provide for 1.5-2 times more wrapping than the number of thread turns.

2. Leaving about 50-70 mm from the beginning of the bundle, lightly twist it, place it in the first thread turn, and while holding it with your hand, tightly wind the long branch of the bundle clockwise, laying it in each thread turn.

3. When reaching the end of the thread, continue wrapping with a second layer, moving the turns to the beginning of the thread. The length of the second layer should be approximately 2/3 of the thread length.

4. Wind the remaining part of the bundle (50-70 mm) in the same way clockwise, laying it from the end of the thread to its beginning.

5. Apply a layer of sealant over the wrapping.

6. Screw the mating elements by hand. With proper wrapping, the mating element should wind up 1.5-2 turns.

7. Using a wrench or torque wrench, continue tightening the element. If the mating element needs to be in a specific position, complete the tightening in the necessary position for the element.

When properly wrapped, the force during tightening should not exceed the tightening torque specified below:

question : comment : feedback