【Daily Question】12.13 Short Answer: What precautions should be taken when installing a centrifugal pump?

1. Construct the concrete foundation according to the basic dimensions, and embed the anchor bolts at the same time. Before installation, the centrifugal pump and motor should be inspected to ensure that all parts are in good condition and there are no debris inside the pump. 2. Place the unit on the foundation; insert wedge shims between the base plate and the foundation. Adjust the wedge shims to align the centrifugal pump horizontally. After adjusting, tighten the anchor bolts. The suction and discharge pipes of a centrifugal pump should be supported by brackets; the pump itself should not be used for such support. 3. The diameter of the inlet and outlet pipes should match those of the pump’s inlet and outlet. When installing a self-priming pump, connect the inlet pipe first, fill it with liquid, then connect the outlet pipe, and adjust the direction of rotation. 4. The inlet pipe of the pump must be compatible with the pump, and its total length must not exceed 5 meters; otherwise, it will affect the self-priming capability. The self-priming height can be calculated simply using the formula below: 3 m for clean water / medium density = actual self-priming height. 5. Once installation is complete, manually rotate the coupling to check for any signs of rubbing; if it rotates smoothly and evenly, the installation is finished.

Precautions for installing centrifugal pumps: 1. Before installation, check that the fasteners of the unit are not loose, and that there are no foreign objects blocking the flow channels within the pump body, to prevent damage to the impeller and pump body during operation. 2. Pumps can be installed either with a rigid connection or a flexible connection. 3. During installation, the weight of the pipes should not be placed on the water pump to prevent it from deforming. 4. When installing the inlet pipeline for a centrifugal pump (pipeline pump), the horizontal section should be slightly inclined in the direction of the water source; it should not be horizontal or tilted upward. Doing so allows air to accumulate inside the inlet pipe, reducing the vacuum level in both the pipe and the centrifugal pump (pipeline pump). This in turn lowers the pump’s ability to draw water and reduces the flow rate of water. 5. When installing a centrifugal pump (pipeline pump), there should not be too many elbows in the inlet pipeline; too many elbows will increase water flow resistance and reduce the pump’s head pressure. The elbow should remain vertical when turning, as turning horizontally causes air to accumulate, thereby reducing the vacuum level in the water pipe and the centrifugal pump (pipeline pump). 6. The inlet position of the water inlet pipe should be correct; under normal circumstances, the distance between the water inlet of the pipe and the bottom as well as the walls of the tank should be less than the diameter of the inlet. If there is sediment or other debris at the bottom of the pool, the distance between the water inlet and the bottom of the pool should be more than 1.5 times the diameter; otherwise, it will lead to poor water intake during pumping or the ingestion of sediment and debris, which can block the water inlet. The water inlet depth of the water intake pipe must be sufficient to prevent swirls on the water surface, which could affect water intake and reduce the flow rate. Generally, the following installation depth should be followed: for small and medium-sized water pumps, the water intake depth should not be less than 300–600 mm, while for large water pumps, it should not be less than 600–1000 mm. 7. The inlet of the centrifugal pump cannot be connected directly to a elbow; connecting it directly to an elbow will result in uneven distribution of the water flow as it passes through the elbow and enters the impeller. When the diameter of the water inlet pipe is larger than that of the water pump’s inlet, an eccentric reducer needs to be installed. The planar part of the eccentric tube should be installed on top. Otherwise, air will also accumulate, resulting in a reduced water output or an inability to draw water up. When the diameter of the water inlet pipe is equal to that of the water pump’s inlet, a straight pipe should be added between the centrifugal pump’s inlet and the elbow to be connected; the length of this pipe must be at least 2 to 3 times the diameter of the water pipe. 8. The inlet pipe equipped with a bottom valve should be kept vertical at its end. If it cannot be kept vertical, the valve will not close on its own, resulting in leaks. If vertical installation is not possible due to topographical constraints, the angle between the water pipe axis and the horizontal plane should be 60° or more. 9. The foot bolts must be tightened during installation to prevent vibrations at startup from affecting the pump’s performance. 10. After installation, rotate the pump shaft; the impeller should make no grinding noises or show any signs of sticking. If this is the case, the pump needs to be disassembled to determine the cause. 11. For the convenience of maintenance and safety in operation, an adjusting valve is installed on each inlet pipeline of the pump, and a pressure gauge is installed near the pump outlet, so as to ensure operation within the rated head and flow rate ranges, guarantee the proper functioning of the pump, and extend its service life.

1. Before installation, check whether the fasteners of the unit are loose and whether there are any foreign objects blocking the flow channels in the pump body, to prevent damage to the impeller and pump body during operation. 2. Pumps can be installed either with a rigid connection or a flexible connection. 3. During installation, the weight of the pipes should not be placed on the water pump to prevent it from deforming. 4. When installing the inlet pipeline for a centrifugal pump (pipeline pump), the horizontal section should be slightly inclined in the direction of the water source; it should not be horizontal or tilted upward. Doing so allows air to accumulate inside the inlet pipe, reducing the vacuum level in both the pipe and the centrifugal pump (pipeline pump). This in turn lowers the pump’s ability to draw water and reduces the flow rate of water. 5. When installing a centrifugal pump (pipeline pump), there should not be too many elbows in the inlet pipeline; too many elbows will increase water flow resistance and reduce the pump’s head pressure. The elbow should remain vertical when turning, as turning horizontally causes air to accumulate, thereby reducing the vacuum level in the water pipe and the centrifugal pump (pipeline pump). 6. The inlet position of the water inlet pipe should be correct; under normal circumstances, the distance between the water inlet of the pipe and the bottom as well as the walls of the tank should be less than the diameter of the inlet. If there is sediment or other debris at the bottom of the pool, the distance between the water inlet and the bottom of the pool should be more than 1.5 times the diameter; otherwise, it will lead to poor water intake during pumping or the ingestion of sediment and debris, which can block the water inlet. The water inlet depth of the water intake pipe must be sufficient to prevent swirls on the water surface, which could affect water intake and reduce the flow rate. Generally, the following installation depth should be followed: for small and medium-sized water pumps, the water intake depth should not be less than 300–600 mm, while for large water pumps, it should not be less than 600–1000 mm. 7. The inlet of the centrifugal pump cannot be connected directly to a elbow; connecting it directly to an elbow will result in uneven distribution of the water flow as it passes through the elbow and enters the impeller. When the diameter of the water inlet pipe is larger than that of the water pump’s inlet, an eccentric reducer needs to be installed. The planar part of the eccentric tube should be installed on top. Otherwise, air will also accumulate, resulting in a reduced water output or an inability to draw water up. When the diameter of the water inlet pipe is equal to that of the water pump’s inlet, a straight pipe should be added between the centrifugal pump’s inlet and the elbow to be connected; the length of this pipe must be at least 2 to 3 times the diameter of the water pipe. 8. The inlet pipe equipped with a bottom valve should be kept vertical at its end. If it cannot be kept vertical, the valve will not close on its own, resulting in leaks. If vertical installation is not possible due to topographical constraints, the angle between the water pipe axis and the horizontal plane should be 60° or more. 9. The foot bolts must be tightened during installation to prevent vibrations at startup from affecting the pump’s performance. 10. After installation, rotate the pump shaft; the impeller should make no grinding noises or show any signs of sticking. If this is the case, the pump needs to be disassembled to determine the cause. 11. For the convenience of maintenance and safety in operation, an adjusting valve is installed on each inlet pipeline of the pump, and a pressure gauge is installed near the pump outlet, so as to ensure operation within the rated head and flow rate ranges, guarantee the proper functioning of the pump, and extend its service life.

1. During installation, the weight of the pipelines should not be borne by the pump, as this can easily damage the water pump； 2. During installation, the foot bolts must be tightened, and the pump should be inspected at regular intervals to prevent it from loosening, so as to avoid severe vibrations when the pump starts, which could affect its performance ； 3. Before installing the water pump, it is necessary to carefully check the pump’s flow channels for any hard objects that could affect its operation, such as stones or iron particles, in order to prevent damage to the components involved in fluid flow during pumping. 4. For ease of maintenance and safety in use, a control valve should be installed on the inlet and outlet pipes of the pump, as well as a pressure gauge near these connections. For high-head pumps, a check valve should also be installed in front of the outlet gate valve to prevent water hammer effects in case of sudden power loss, thereby ensuring that the pump operates under optimal conditions and extending its service life ； 5. Pumps used in applications that require a suction lift should be equipped with a foot valve. The inlet pipeline should have as few bends as possible, and there should be no leaks of water or air, to avoid affecting the pump’s suction performance ； 6. To prevent impurities from entering the pump and blocking the flow channels thereby affecting performance, a filter should be installed in front of the pump inlet ； 7. Before installing the piping, rotate the rotor component of the water pump; there should be no friction or sticking. Otherwise, the pump should be disassembled to determine the cause.

1. Construct the concrete foundation according to the basic dimensions, and embed the anchor bolts at the same time. Before installation, the centrifugal pump and motor should be inspected to ensure that all parts are in good condition and there are no debris inside the pump. 2. Place the unit on the foundation; insert wedge shims between the base plate and the foundation. Adjust the wedge shims to align the centrifugal pump horizontally. After adjusting, tighten the anchor bolts. The suction and discharge pipes of a centrifugal pump should be supported by brackets; the pump itself should not be used for such support. 3. The diameter of the inlet and outlet pipes should match those of the pump’s inlet and outlet. When installing a self-priming pump, connect the inlet pipe first, fill it with liquid, then connect the outlet pipe, and adjust the direction of rotation. 4. The inlet pipe of the pump must be compatible with the pump, and its total length must not exceed 5 meters; otherwise, it will affect the self-priming capability. The self-priming height can be calculated simply using the formula below: 3 m for clean water / medium density = actual self-priming height. 5. Once installation is complete, manually rotate the coupling to check for any signs of rubbing; if it rotates smoothly and evenly, the installation is finished.

Precautions to be taken when installing the overall water pump: (1) Before installing the water pump, it is necessary to verify the dimensions of the pump foundation, the positions of the holes for the anchor bolts as well as their depth, the elevation of the pump foundation surface, and the relative positions of multiple pumps, based on the pump specifications and construction drawings. Any errors found must be corrected promptly. (2) Before the water pump is installed, a longitudinal center line should be marked on the foundation surface; when the pump is in place, its longitudinal center axis must align with the foundation’s center line. (3) The anchor bolts should be inserted before positioning, and horizontal adjustment for positioning shall begin after they are in place. 1---35 (4) Small water pumps can be leveled using a rough method; for more accurate leveling, a level and a steel ruler can be used together. When leveling, precision shims and inclined shims should be placed on either side of the foundation bolts, as shown in Figure 1---35. Inclined shims should be used in groups. (5) After the water pump is leveled, secondary grouting of the anchor bolt holes can be carried out. Grout made of pea gravel concrete should be used, and it must be compacted until no more grout comes out, after which the surface should be smoothed. (6) Tighten all the anchor bolts and bolts on the base. (7) For the installation of large water pumps, after rough leveling, precise tests and adjustments for levelness and concentricity must also be carried out. (8) Once the water pump is installed in full compliance with the specification requirements, it is also necessary to clean or replace the lubricating oil as well as the packing in the pump’s packing box; only after this is done can the pump be put into use.

1. Construct the concrete foundation according to the basic dimensions, and embed the anchor bolts at the same time. Before installation, the centrifugal pump and motor should be inspected to ensure that all parts are in good condition and there are no debris inside the pump. 2. Place the unit on the foundation; insert wedge shims between the base plate and the foundation. Adjust the wedge shims to align the centrifugal pump horizontally. After adjusting, tighten the anchor bolts. The suction and discharge pipes of a centrifugal pump should be supported by brackets; the pump itself should not be used for such support. 3. The diameter of the inlet and outlet pipes should match those of the pump’s inlet and outlet. When installing a self-priming pump, connect the inlet pipe first, fill it with liquid, then connect the outlet pipe, and adjust the direction of rotation. 4. The inlet pipe of the pump must be compatible with the pump, and its total length must not exceed 5 meters; otherwise, it will affect the self-priming capability. The self-priming height can be calculated simply using the formula below: 3 m for clean water / medium density = actual self-priming height. 5. Once installation is complete, manually rotate the coupling to check for any signs of rubbing; if it rotates smoothly and evenly, the installation is finished. The 6 pumps also need to be aligned with the motor. After installation, it is necessary to check that their operating parameters are as specified in the instructions.

Precautions to be taken when installing the overall water pump: (1) Before installing the water pump, it is necessary to verify the dimensions of the pump foundation, the positions of the holes for the anchor bolts as well as their depth, the elevation of the pump foundation surface, and the relative positions of multiple pumps, based on the pump specifications and construction drawings. Any errors found must be corrected promptly. (2) Before the water pump is installed, a longitudinal center line should be marked on the foundation surface; when the pump is in place, its longitudinal center axis must align with the foundation’s center line. (3) The anchor bolts should be inserted before positioning, and horizontal adjustment for positioning shall begin after they are in place. 1---35 (4) Small water pumps can be leveled using a rough method; for more accurate leveling, a level and a steel ruler can be used together. When leveling, precision shims and inclined shims should be placed on either side of the foundation bolts, as shown in Figure 1---35. Inclined shims should be used in groups. (5) After the water pump is leveled, secondary grouting of the anchor bolt holes can be carried out. Grout made of pea gravel concrete should be used, and it must be compacted until no more grout comes out, after which the surface should be smoothed. (6) Tighten all the anchor bolts and bolts on the base. (7) For the installation of large water pumps, after rough leveling, precise tests and adjustments for levelness and concentricity must also be carried out. (8) Once the water pump is installed in full compliance with the specification requirements, it is also necessary to clean or replace the lubricating oil as well as the packing in the pump’s packing box; only after this is done can the pump be put into use.

Answer: 1. Construct the concrete foundation according to the basic dimensions, and embed the anchor bolts at the same time. Before installation, the centrifugal pump and motor should be inspected to ensure that all parts are in good condition and there are no debris inside the pump. 2. Place the unit on the foundation; insert wedge shims between the base plate and the foundation. Adjust the wedge shims to align the centrifugal pump horizontally. After adjusting, tighten the anchor bolts. The suction and discharge pipes of a centrifugal pump should be supported by brackets; the pump itself should not be used for such support. 3. The diameter of the inlet and outlet pipes should match those of the pump’s inlet and outlet. When installing a self-priming pump, connect the inlet pipe first, fill it with liquid, then connect the outlet pipe, and adjust the direction of rotation. 4. The inlet pipe of the pump must be compatible with the pump, and its total length must not exceed 5 meters; otherwise, it will affect the self-priming capability. The self-priming height can be calculated simply using the formula below: 3 m for clean water / medium density = actual self-priming height. 5. Once installation is complete, manually rotate the coupling to check for any signs of rubbing; if it rotates smoothly and evenly, the installation is finished.