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| Email: | sales@sanchangpump.com |
| Hotline： | +86 133 0748 1676 |
| +86 193 1300 1794 | |
| Mobile： | +86 133 0748 1676 |
| Wechat： | +86 193 1300 1794 |
| Address： | No.517,Xiangfu Road |
| Yuhua District, | |
| Changsha City | |
| Hunan Province, P.R.C |
DG Boiler Feed Pump High Pressure
Classification:
BB4 Multistage Centrifugal Pump
Electric power industry
Key words:
Q = 36~180 m3/h (medium pressure, second high pressure)
Head range: H = 740~2150m (high pressure)
H = 409~1056m (secondary high pressure)
H = 270~672m (MV)
Conveying temperature:-20-205 ℃ (please declare when it is higher than 150 ℃)
Suction pressure: 0-7.5MPa (please declare when higher than 0.5 MPa)
Sealing form: packing seal, mechanical seal
Hotline:
- Product Description
- Performance Parameter
- Installation Drawings
- Installation And Use
- Faults And Solutions
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- Commodity name: DG Boiler Feed Pump High Pressure
Flow range: Q = 100~580 m3/h(DG high pressure)<br>Q = 36~180 m3/h (medium pressure, second high pressure)<br>Head range: H = 740~2150m (high pressure)<br>H = 409~1056m (secondary high pressure)<br>H = 270~672m (MV)<br>Conveying temperature:-20-205 ℃ (please declare when it is higher than 150 ℃)<br>Suction pressure: 0-7.5MPa (please declare when higher than 0.5 MPa)<br>Sealing form: packing seal, mechanical seal</br></br></br></br></br></br></br>
Product overview
DG series multistage centrifugal pump allows to convey corrosive liquid, 105℃ clear water or liquids with physical and chemical properties similar to water. You can use this machine for urban water supply and drainage, garden irrigation, pressurized water supply in fire protection, and small boiler feed pump or similar hot water transportation occasions. Our DG boiler feed water pumps are designed with durable materials and compact construction to prolong machine life and ensure stable operation.
Flow Rate: 3~1350m3/h
Head: 49~1800m
Power:3~1120KW
Application:
1. Industrial and urban water supply and drainage.
2. Pressurized water supply in high-rise buildings.
3. Sprinkler irrigation in gardens.
4. Pressurized water supply in fire fighting.
5. Long-distance water delivery, heating, bathroom and other cold and warm water circulation pressurization and supporting equipment.
6. Especially for small boiler water supply.DG type high-pressure boiler pump is a single-suction, multi-stage segmental centrifugal pump. The pump casing can be axially disassembled at the axis. The suction port of DG85-80 × 8 type pump is vertically upward, and the discharge port is vertically upward, perpendicular to the axis line. From the direction of the drive end, the rotary direction of the water pump is clockwise, and counterclockwise rotation can be produced according to the needs of users. Users can make special suggestions when ordering goods.
The pump body and the pump cover of the boiler feed pump form the working chamber of the impeller. The inlet and outlet flanges are provided with pipe screw holes for installing vacuum gauge and pressure gauge, and the lower part of the pump body is provided with pipe screw holes for discharging residual water.
The impeller is a single-suction closed type, and a balance disc is set to balance most of the axial force. At the same time, a thrust bearing is provided to bear a small part of the axial thrust that may remain. The arrangement of the bearing makes the shaft in a stable tie rod state. The impeller must be strictly checked for static balance before assembly to ensure smooth operation.
The pump shaft is supported by two babbit alloy sliding bearings, which are installed in the bearing body in the pump suspension and lubricated with thin oil.
A sealing ring is arranged on the pump body, which can improve the volumetric efficiency of the pump. On the other hand, it can also avoid the high-pressure water from flowing back into the suction chamber, disturbing the inlet flow field, and can ensure the suction performance of the pump.
The shaft seal is generally a soft packing seal. When the water pump is working, it can lead a small amount of medium to the stuffing box, and it can also be externally connected with cooling and lubricating water to play the role of water seal and cooling and lubrication. According to the needs of users, the packing seal can be changed to mechanical seal.
Model Description
Model example: DG45-80 × 6
DG-single-suction multi-stage high-pressure boiler feed pump
45-Pump design point flow
80-pump single-stage head
6-pump stage
Material of main parts
Inlet and outlet section: ZG230-450 middle section: ZG230-450 guide vane: QT450 impeller: QT450
Spindle: 40Cr Seal ring: QT450 Bushing: HT250 Balance disc: ZG2Cr13 Balance ring: Tin bronze
Bearing balance: DG type high pressure boiler pump rotor is supported by rolling bearings at both ends of the pump shaft. Lubricated with thin oil and cooled with circulating water, the axial thrust of the rotor is automatically balanced by a balance disc. The equalizing return water is returned to the suction section of the pump through the equalizing return pipe. The rotor of DG type secondary high pressure pump is supported by sliding bearings at both ends of the pump shaft. Lubricated with thin oil and cooled with circulating water, the axial thrust of the rotor is balanced by a balance disc. A return pipe is installed between the balance chamber and the front section. The rotor of DG high pressure boiler pump is supported by sliding bearings at both ends of the pump. The bearing is forced to lubricate, the pump itself is equipped with an oil system, and the axial thrust of the rotor is balanced by a balance disc. And with a thrust bearing, used to bear the residual axial force due to changes in working conditions, a return pipe is installed between the balance chamber body and the suction pipe.
Transmission: medium-pressure and sub-high-pressure multistage pumps are driven by electric motors through flexible couplings. Viewed from the drive direction, the pump rotates clockwise. The high-pressure pump is driven by an electric motor through an elastic coupling, and can also be equipped with a toothed coupling, a diaphragm coupling, a hydraulic coupling, and the prime mover can be driven by a small steam turbine or an electric motor. From the transmission direction, the pump rotates clockwise.
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Flow range: Q = 100~580 m3/h(DG high pressure)
Q = 36~180 m3/h (medium pressure, second high pressure)
Head range: H = 740~2150m (high pressure)
H = 409~1056m (secondary high pressure)
H = 270~672m (MV)
Conveying temperature:-20-205 ℃ (please declare when it is higher than 150 ℃)
Suction pressure: 0-7.5MPa (please declare when higher than 0.5 MPa)
Sealing form: packing seal, mechanical seal
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Water pump installation steps
1.1 preparations
1.1.1 Before assembly, all pump parts, especially the finished surfaces that cooperate with each other, must be thoroughly cleaned.
1.1.2 All parts shall be counted, and the parts shall be classified and numbered according to the assembly order.
Assembly of 1.2 Pump Parts
1.2.1 Pay attention to install the middle sealing ring to prevent it from falling off.
1.2.2 Pay attention to the guide vane anti-rotation pin.
1.2.3 Tighten the pump body through-bar nut symmetrically to maintain proper tightening force. Too loose will cause leakage of the middle joint surface, and too tight will cause deformation of the stator components. The torque of the wrench during assembly is about 5550 Nm. The piercing bar shall be tightened symmetrically.
1.2.4 After the bar is basically tightened, use a dial gauge to find that the front and rear sections are not parallel and should be ≤ 0.1mm 1.3 to measure the total rotor string, which should meet the requirements of the drawings.
1.4 Install the front cover and low pressure end cover bearings and lower shoes, and lift the shaft to the center position.
1.5 Check the end face runout of the balance sleeve with special lifting tool and dial indicator, which shall meet the requirements of the final assembly drawing.
1.6 assemble the rotor components and tighten the lock nut. Measurement of the string quantity after the balance plate is installed shall meet the requirements of the final assembly drawing.
1.7 the gap between the top and both sides of the head cover, tail cover, bearing body and bearing bush shall meet the specified value of the quality requirements of the bearing bush.
1.8 adjust the center of the bearing bush on both sides, and lock the adjusting nut after adjustment.
1.9 assembly thrust bearing
1.9.1 For the assembly of thrust bearing parts, the black gold pad shall be scraped and ground according to the requirements of bearing parts. The thrust pad shall rotate flexibly during assembly. 1.9.2 After the thrust bearing is installed, the axial clearance between the balance disc and the balance sleeve shall be 0.04~0.08mm according to the requirements of the final assembly drawing, and the adjustment of the clearance shall be realized by adjusting ring.
1.9.3 After adjusting the clearance, install the thrust bearing and thrust plate, and lock the lock nut.
The pump body and the pump cover form the working chamber of the impeller. The inlet and outlet flanges are provided with pipe screw holes for installing vacuum gauge and pressure gauge, and the lower part of the pump body is provided with pipe screw holes for discharging residual water.
The impeller is a single-suction closed type, and a balance disc is set to balance most of the axial force. At the same time, a thrust bearing is provided to bear a small part of the axial thrust that may remain. The arrangement of the bearing makes the shaft in a stable tie rod state. The impeller must be strictly checked for static balance before assembly to ensure smooth operation.
The pump shaft is supported by two babbit alloy sliding bearings, which are installed in the bearing body in the pump suspension and lubricated with thin oil.
A sealing ring is arranged on the pump body, which can improve the volumetric efficiency of the pump. On the other hand, it can also avoid the high-pressure water from flowing back into the suction chamber, disturbing the inlet flow field, and can ensure the suction performance of the pump.
The shaft seal is generally a soft packing seal. When the water pump is working, it can lead a small amount of medium to the stuffing box, and it can also be externally connected with cooling and lubricating water to play the role of water seal and cooling and lubrication. According to the needs of users, the packing seal can be changed to mechanical seal.
1.9.4 The clearance between the thrust bearing seat and the push plate shall be adjusted by the cushion to ensure the requirements for the thrust bearing clearance in the assembly drawing.
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Hunan Sanchang Pump Co., Ltd.
| Email: | sales@sanchangpump.com |
| Hotline: | +86 133 0748 1676 |
| +86 193 1300 1794 | |
| Mobile/wechat: | +86 133 0748 1676 |
| +86 193 1300 1794 | |
| Address: | No.517,Xiangfu Road, Yuhua |
| District, Changsha City | |
| Hunan Province, P.R.C |
