PRODUCTS CENTER
Brazil DG High Pressure Multistage 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)
Medium Temperature:-20~205 ℃ (Please specify if temperature exceeds 150℃)
Suction Pressure: 0~7.5MPa (Please specify if suction pressure is above 0.5 MPa)
Shaft Seal: packing seal, mechanical seal
Product Description
Product Overview
The DG 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 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.
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 |
