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| Address： | No.517,Xiangfu Road |
| Yuhua District, | |
| Changsha City | |
| Hunan Province, P.R.C |
DG Type High Pressure Multistage Boiler Feed Pump
Classification:
Multistage Centrifugal Pump
Electric Power Industry
Metallurgical Industry
Key words:
Multistage Pump
Centrifugal Pump
Boiler Feed Pump
Q = 36~180 m3/h (medium & sub-high pressure)
Head Range: H = 740~2150m (high pressure)
H = 409~1056m (sub-high Pressure)
H = 270~672m (medium pressure)
Fluid Temperature: -20~205 ℃ (Please specify if temperature exceeds 150℃)
Inlet Pressure: 0~7.5MPa (Please specify if suction pressure is above 0.5 MPa)
Shaft Seal: packing seal, mechanical seal
Hotline:
- Product Description
- Performance Parameter
- Installation Drawings
- Installation And Use
- Faults And Solutions
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- Commodity name: DG Type High Pressure Multistage Boiler Feed Pump
Flow Range: Q = 100~580 m3/h(DG high pressure)<br> Q = 36~180 m3/h (medium & sub-high pressure)<br> Head Range: H = 740~2150m (high pressure)<br> H = 409~1056m (sub-high Pressure)<br> H = 270~672m (medium pressure)<br> Fluid Temperature: -20~205 ℃ (Please specify if temperature exceeds 150℃)<br> Inlet Pressure: 0~7.5MPa (Please specify if suction pressure is above 0.5 MPa)<br> Shaft Seal: packing seal, mechanical seal<br><br>
Product Overview
The DG type high pressure multistage boiler feed pump are suitable for transporting corrosive liquids and clean water up to 105℃, as well as fluids with physicochemical properties analogous to water.Typical applications include urban water supply & drainage, garden irrigation, fire-fighting pressurized water supply, boiler feed and other hot water conveying services.DG boiler feed pumps adopt robust material configuration and compact structural design to extend service life and guarantee stable running performance.
Flow Rate: 3~1350m3/h
Head: 49~2000m
Power:3~1120KW
Application
1. Industrial and municipal water supply & drainage
2. Booster water supply for high-rise buildings
3. Garden sprinkler irrigation
4. Fire service booster water supply
5. Long-distance water transmission, heating systems, domestic hot/cold water circulation pressurization and associated auxiliary systems
6. Optimized specifically for small-capacity boiler feed service
The DG type high-pressure boiler feed pump is single-suction segmented multistage centrifugal pump with axially split casing. For model DG85‑80×8, both suction and discharge nozzles point vertically upward and run perpendicular to the shaft centerline. Viewed from the drive end, the pump rotates clockwise; counter-clockwise rotation is available as a custom configuration upon customer specification at order placement.
The pump casing and cover form the impeller working chamber. Threaded tapping holes on suction and discharge flanges are reserved for mounting vacuum and pressure gauges, and drain tapping at the bottom of the casing is designed for residual fluid drainage.
Equipped with single-suction closed impellers, the unit adopts a balance disc to counteract most axial thrust, while a thrust bearing bears residual minor axial load. The bearing arrangement keeps the pump shaft under stable tie-rod tension. Every impeller passes strict static balance inspection before assembly to ensure smooth operation.
The pump shaft is supported by two babbitt-lined plain bearings installed inside bearing housings of the pump bracket, lubricated by oil bath.
Replaceable casing wear rings are fitted on the casing to improve volumetric efficiency, prevent high-pressure liquid backflow into the suction chamber and inlet flow field disturbance, thus securing reliable pump suction performance.
Soft packing seal is adopted as standard shaft sealing. During pump operation, a small quantity of process medium flows into the stuffing box for water sealing; external cooling & flushing water connection is optional for auxiliary cooling and lubrication. Mechanical seal can replace packing seal per customer’s requirement.
Model Description
Model example: DG45-80 × 6
DG —— Single‑suction multistage sub‑high pressure boiler feed pump
45 —— Design rated flow: 45m³/h
80 —— Single-stage design head: 80 m
6 —— Number of pump stages: 6 stages
Main Component Materials
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 Balancing:For the DG-type high-pressure boiler pump, the rotor is supported by rolling bearings at both ends of the pump shaft. It uses oil bath lubrication and circulating water cooling. The axial thrust of the rotor is automatically balanced by a balancing disc. The balanced return water flows back to the pump suction section via a balanced return pipe.
For the DG-type sub-high-pressure boiler pump, the rotor is supported by plain bearings at both ends of the pump shaft. It uses oil bath lubrication and circulating water cooling. The axial thrust of the rotor is balanced by a balancing disc. A return water pipe is installed between the balancing chamber and the front section.
For the DG-type high-pressure boiler pump, the rotor is supported by plain bearings at both ends of the pump shaft. The bearings are force-lubricated, and the pump is supplied with its own oil system. The axial thrust of the rotor is balanced by a balancing disc. Additionally, a thrust bearing is provided to absorb residual axial forces resulting from changes in operating conditions. A return water pipe is installed between the balancing chamber housing and the suction pipe.
Drive:Medium-pressure and sub-high-pressure multistage pumps are driven by an electric motor via a flexible coupling. Viewed from the drive end, the pump rotates clockwise.
High-pressure pumps are driven by an electric motor via a flexible coupling, and can also be equipped with a gear coupling, diaphragm coupling, or fluid coupling as required. The prime mover can be a small steam turbine or an electric motor. Viewed from the drive end, the pump rotates clockwise.
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Flow Range: Q = 100~580 m3/h(DG high pressure)
Q = 36~180 m3/h (medium & sub-high pressure)
Head Range: H = 740~2150m (high pressure)
H = 409~1056m (sub-high Pressure)
H = 270~672m (medium pressure)
Fluid Temperature: -20~205 ℃ (Please specify if temperature exceeds 150℃)
Inlet Pressure: 0~7.5MPa (Please specify if suction pressure is above 0.5 MPa)
Shaft Seal: packing seal, mechanical seal
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Outline Installation Drawing of DG High Pressure Multistage Boiler Feed Pump
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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: | info@sanchangpump.net |
| Hotline: | +86 181 4266 2779 |
| +86 193 1300 1794 | |
| Mobile/Wechat/WhatsApp: | +86 181 4266 2779 |
| Address: | No.517,Xiangfu Road, Yuhua |
| District, Changsha City | |
| Hunan Province, P.R.C |
