Medium and low pressure multi-stage boiler feed pump DG85-80 * 8

Description :

 

DG85-80 * 8 boiler feedwater pump product usage

The DG type horizontal multi-stage boiler feed pump is a new product developed by our factory based on the relevant specifications for industrial boiler water supply and drainage. Due to the use of energy-saving products recommended by the state in the hydraulic model, DG type pumps have high efficiency, wide performance range, and better meet usage requirements. Used to replace the old model GC centrifugal pump, it adopts a horizontal and multi-stage pump segmented structure, which ensures safe, stable operation, low noise, long service life, and easy installation and maintenance. This type of pump is particularly suitable for industrial boiler water supply and drainage, cooling water transportation, etc. It can also be used to transport hot water, oil products, corrosive media, etc. by changing the material, sealing form, and adding cooling systems, widely applicable to industries such as petrochemicals, hot water circulation, environmental protection, and pure water transportation. The temperature of the conveying medium is -20 degrees Celsius; C～150° C. The allowable import pressure is 0.6MPa.

Performance range of DG85-80 * 8 boiler feedwater pump

Flow rate: Q=100m3/h
Head: H=400m (sub high pressure)

DG100-80 * 5 Boiler Feed Pump Model Description

Example: DG85-80X12
DG multi-stage boiler feedwater pump
85- The design point flow rate is 85m3/h
80- Design point single-stage lift of 80m
12— — The level is 12

Product Features of DG85-80 * 8 Boiler Feed Pump

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 seal or mechanical seal, which is safe, reliable, structurally simple, and easy to maintain.
4. The shaft is a fully sealed structure, ensuring no contact with the medium, no corrosion, and a long service life.

Installation sequence of DG85-80 * 8 boiler feedwater pump

(1) The unit has been transported to the site, and the motor with the base has been installed. When finding the flat base, there is no need to remove the water pump and motor.
(2) Place the base on the foundation, place wedge-shaped shims near the anchor screws, raise the base by 20-40 millimeters, and prepare to level it before filling it with cement slurry.
(3) Use a spirit level to check the levelness of the base. After leveling, tighten the foot nut and fill the base with cement slurry. After the cement dries up, check the levelness again.
(4) When the power of the unit is high, in order to facilitate transportation, the pump, motor, and base may be packaged separately. At this time, the user needs to install and calibrate the water pump unit by themselves, using methods such as washing:
a. Clean the dirt on the support plane of the base, the water pump foot, and the motor foot plane, and place the water pump and motor on the base.
b. Adjust the pump shaft level and tighten the nut appropriately after leveling to prevent movement
c. Lift the motor, align the pump coupling with the motor coupling, and lower the motor to the corresponding position;
d. Adjust the gap between the two couplings to about 5mm, and calibrate whether the axis lines of the motor shaft and the pump shaft coincide. The method is to place a ruler on the coupling, and the outer circles of the two couplings should be level with the ruler. If they do not coincide, adjust the relative position of the motor or pump, or use a thin sheet to adjust;
e. In order to check the accuracy of installation, a feeler gauge should be used to measure the gap between the two coupling planes at several different positions on the circumference of the coupling. The gap difference on the coupling plane should not exceed 0.3 millimeters per week. The difference between the center lines of the two ends, vertically or horizontally, should not exceed 0.1 millimeters.
(5) When the unit does not come with a base, it needs to be installed directly on the foundation using a method similar to 4, but more attention should be paid to calibration.

Installation of DG85-80 * 8 boiler feedwater pump

1. The weight of the pipeline should not be borne on the pump during installation, otherwise it is easy to damage the water pump;
2. During installation, the anchor bolts must be tightened, and the pump should be checked at regular intervals to prevent loosening, in order to avoid severe vibration during pump start-up that may affect pump performance;
3. Before installing the water pump, carefully check whether there are any hard objects (such as stones, iron sand, etc.) in the pump channel that affect the operation of the water pump to avoid damaging the overcurrent components during the operation of the water pump
4. In order to maintain convenience and ensure safety, a regulating valve should be installed on the inlet and outlet pipelines of the pump, and a pressure gauge should be installed near the inlet and outlet of the pump. For high lift pumps, to prevent water hammer, a check valve should also be installed in front of the outlet gate valve to cope with accidents such as sudden power outages and loss of power, thereby ensuring that the pump operates under suitable conditions and extending its service life;
5. Pumps used in suction applications should be equipped with bottom valves, and the inlet pipeline should not have too many bends. At the same time, there should be no water or air leakage to avoid affecting the suction performance of the pump;
6. To prevent impurities from entering the pump and blocking the flow path, a filter should be installed in front of the pump inlet to improve performance;
7. Before installing the pipeline, the rotor components of the water pump should be rotated without friction or jamming, otherwise the pump should be disassembled to check the cause.

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