GC series multi-stage boiler feedwater pump

Product Introduction

The GC type multi-stage pump series includes horizontal, single suction multi-stage, and segmented centrifugal pumps, all of which are designed and optimized by computers. The company has strong technical strength, rich production experience, and comprehensive testing methods to ensure stable and reliable product quality. The GC type multi-stage pump has the characteristics of high efficiency, wide performance range, safe and stable operation, low noise, long service life, and easy installation and maintenance. It is used for conveying clean water or other liquids with physical and chemical properties similar to water. Widely applicable to industrial and urban water supply and drainage, high-rise building pressurized water supply, garden sprinkler irrigation, fire pressurization, long-distance water supply, heating, bathroom and other cold and warm water circulation pressurization and equipment matching, especially suitable for small boiler water supply.

Model Meaning

Product advantages

1. The hydraulic model is advanced, efficient, and has a wide range of performance.
2. The pump runs smoothly with low noise.
3. The shaft seal adopts soft packing sealing, which is safe, reliable, structurally simple, and easy to maintain.

Selection range

• Flow rate: 5-55m3/h;
• Lift: 46-301m;
• Power: 3-75KW;
• Speed: 2950r/min;
• Caliber: φ 40- φ 100;
• Temperature range: ≤ 80 ℃;
• Work pressure: ≤ 2.7Mpa.

performance parameterThis data is for reference only, please refer to the actual order!

structural drawings

1. The GC type water pump is a multi-stage segmented design, with the inlet and outlet of the 1.5GC-4GC models located on the inlet and outlet sections respectively, all vertically upward. The head of the water pump can be increased or decreased according to usage needs. Whether the water pump is well assembled or not has a great impact on its performance, especially the relative position between the outlet of each impeller and the inlet of the guide vane. The center of the outlet of each suction impeller must be aligned with the center of the guide vane. Any slight deviation will reduce the flow rate, head, and efficiency of the water pump. Therefore, it is necessary to pay attention to assembly after maintenance, and adjust if there is any deviation.
2. The main components of GC type water pump include shaft, shaft sleeve, inlet section, impeller, guide wing, sealing ring, middle section, outlet section, balance ring, balance plate, tail cover inlet section, middle section, and outlet section cover, all of which are made of cast iron and together form the working chamber of the pump.
3. The impeller is made of cast iron and has blades inside. The liquid enters on one side along the axial direction. Due to the unequal pressure on the impeller before and after, there must be an axial force, which is borne by the balance plate. The impeller is manufactured through static balance testing.
4. The shaft is made of high-quality carbon steel, with an impeller installed in the middle, fixed on the shaft with keys, shaft sleeves, and shaft sleeve nuts. One end of the shaft is equipped with a coupling component and directly connected to the motor. When viewed from the direction of rotation, the pump shaft rotates clockwise.
5. The sealing ring is made of cast iron to prevent high-pressure water from leaking back into the inlet section of the water pump. It is fixed in the inlet and middle sections respectively and is a vulnerable part. It can be replaced with spare parts after wear and tear.
6. The balance ring is made of cast iron and fixed on the outlet section. It, together with the balance plate, forms the balance device. The balance plate is made of wear-resistant cast iron and is installed on the shaft, located between the 7th section and the tail cover, to balance axial forces. The shaft sleeve is made of cast iron and located at the two packing chambers, used to fix the impeller and protect the pump shaft. For vulnerable parts, they can be replaced with spare parts after wear and tear.
7. The bearing is a single row radial ball bearing lubricated with calcium based grease. The packing plays a sealing role, preventing air from entering and a large amount of liquid from leaking out.
8. The packing seal consists of a packing chamber on the inlet section and tail cover, a packing gland, a packing ring, and packing, etc. A small amount of high-pressure water flows into the packing chamber to provide a water seal. The tightness of the filler must be appropriate, neither too tight nor too loose, based on the liquid being able to seep out drop by drop. If the packing is too tight, the shaft sleeve is prone to heating and consuming power. The packing is too loose, which reduces the efficiency of the water pump due to liquid loss.

Installation sizeThis data is for reference only, please refer to the actual order!

Outline dimension drawings for 1.5GC, 2GC, and 2.5GC

2.5GC-3.5, 4GC Outline Dimensional Drawing

Outline dimension table

Drawing

precautions

1. 1. Loading and unloading sequence
   1. Tightly install the sealing ring (9) onto the inlet section (8).
   2. Insert the shaft sleeve A (5) and the key of the shaft (9) through the inlet section (8) and push it into the impeller (10). Place a paper pad on the middle section, install the middle section (11), and then push in the second impeller. Repeat the above steps to install all impellers and the middle section.
   3. Install the balance ring (14) onto the outlet section (13).
   4. Install the outlet section (13) onto the middle section, and then tighten the inlet section, middle section, and outlet section together with the tightening bolt (18).
   5. Install the balance plate (15) and shaft sleeve (17).
   6. Install the paper pad on the tail cover, install the tail cover on the outlet section, and sequentially install the packing and packing ring (7), packing cover (6) into the packing chamber of the inlet section and tail cover.
   7. Install the bearing body (4) onto the inlet section and tail cover respectively, and tighten them with bolts.
   8. Install the ball bearing (3) and tighten it with the shaft sleeve nut (1) and the round nut (20) respectively.
   9. Add an appropriate amount of butter into the bearing body, and place a paper pad on the bearing cover (2). Install the bearing cover onto the bearing body and tighten it with screws.
   10. Install the water return pipe, coupling components, and all square screw plugs.
   11. Disassemble in reverse of the above steps.
2. Installation:
   1. Preparation before installation:
   2. Check the water pump and motor;
   3. Prepare tools and lifting machinery;
3. Check the foundation of the machine;
   1. 2. Installation sequence
   2. The entire set of water pumps has been transported to the site, and the electric motor with the base has been installed. When looking for a flat base, there is no need to remove the water pump and motor.
   3. Place the base on the foundation, place wedge-shaped iron blocks near the anchor screws, raise the base by about 20-40 millimeters, and prepare to level it before filling it with cement.
   4. Use a spirit level to check the horizontal bottom of the base, level it, then tighten the foot nuts and fill the base with cement.
   5. After 3-4 days of cement solidification, check the water level again.
   6. Clean and remove any dirt from the support surface of the base, water pump feet, and motor feet, and place the motor and water pump on the base.
   7. Adjust the level of the pump shaft. After leveling, tighten the nuts appropriately to prevent movement. After adjustment, install the motor and place iron plates at uneven positions. Leave a certain gap between the pump and the coupling.
4. Place the level ruler on the coupling and check if the axis of the water pump and the axis of the motor coincide. If they do not coincide, place a thin iron plate under the feet of the motor and pump to make the outer circles of the two couplings level with the level ruler. Then take out several thin iron plates from the pads and replace them with a whole piece of ground plate that has been planed, and recheck the installation situation.
   1. To check the accuracy of installation. Measure the gap between the two coupling planes using a feeler gauge at several opposite positions. The maximum and minimum gap difference on the coupling plane should not exceed 0.3 millimeters, and the difference between the center lines of the two ends should not exceed 0.1 millimeters.
   2. 3. Start and Stop:
   3. Remove all the oil applied to the shaft and other oiled parts.
   4. Clean the bearings and shaft chamber with gasoline, and wipe them clean with cotton yarn.
   5. Add calcium based butter into the bearing body.
   6. Start the experiment. Start the motor, check the direction of rotation of the motor, and strictly prohibit the water pump from reversing to loosen the shaft sleeve nut.
   7. Inject water into the pump or use a vacuum pump to draw water.
   8. Close the valve and pressure gauge plug on the discharge pipe.
   9. After the above process is completed, start the motor and open the pressure gauge plug.
   10. When the multi-stage pump is running at normal speed, the pressure gauge displays the appropriate pressure, then open the vacuum gauge plug and gradually open the gate valve on the drainage pipeline until the required pressure is reached.
5. When stopping the water pump, slowly close the gate valve on the drainage pipeline and close the vacuum gauge plug. And stop the motor, then close the pressure gauge plug.
   1. When the water pump is not used for a long time, it should be disassembled, the water in the other parts of the pump should be wiped dry, and rust proof oil should be applied to the sliding surface for proper storage.
   2. work:
   3. Pay attention to the temperature of the water pump bearings, which should not exceed the external temperature of 35 ℃. Its maximum temperature shall not exceed 75 ℃.
   4. When the multi-stage pump is running, pay attention to refueling regularly.
   5. The normal degree of water leakage in the packing room is based on 10-20 drops per minute, and the tightness of the packing gland should be adjusted at any time.

Regularly inspect the coupling and pay attention to checking the temperature rise of the motor bearings.