PRODUCTS CENTER
Cyprus Self-balancing Multistage Boiler Feed Water Pump
Head Range: 50~2000 m
Fluid Temperature: -20 ℃ ~ 150 ℃
Inlet Pressure: 0.6 MPa
Shaft Seal: packing seal, mechanical seal
Available Materials: HT200, HT250, QT600, ZG, 304, 316, 316L, 317L, 904L, CD4-MCu, etc
Note: The listed performance parameters are in the normal temperature and clean water state.
Product Description
Product Description
DGP type self-balancing multistage boiler feed pump is designed to deliver clean water free of solid particles, or fluids with similar physicochemical properties, applicable for low, medium and high-pressure boiler water supply service.
Overview
Developed as an advanced high-efficiency, energy-saving and long-service-life multistage centrifugal pump, satisfy customer requirements, the DGP type pump adopts internationally proven high-efficiency energy-saving hydraulic profiles. It abandons the conventional design with balance assemblies, and promotes technical advancement of high-pressure multistage pump products. Designed and manufactured in accordance with API610 specifications, the pump holds a leading technical position across the industry. It features a wide high-efficiency operating range, broad performance envelope, excellent anti-cavitation capability, stable and secure operation, low noise, fewer wearing parts as well as easy installation and maintenance.
Structure Description
The DGP self-balancing multistage boiler feed pump features innovative structural redesign, by removing the conventional axial thrust balancing mechanism, and balance disc assembly used on traditional multistage centrifugal pumps, making it an ideal upgraded replacement for D and DG series multistage centrifugal pumps.
The balancing unit can be eliminated.This eliminates two types of losses: disc friction loss generated by the balance disc, and backflow loss of the balancing medium.As a result, the pump’s hydraulic efficiency rises by 5% to 14%, compared with equivalent conventional multistage pumps. The absence of balance disc friction cuts shaft power input, and achieves remarkable energy conservation, reducing power consumption, by roughly 3% versus similar pump models. In addition, this design fundamentally eliminates typical faults triggered by failed balancing devices, such as severe wear of balance disc/balance ring, and rotor seizure. Service life is significantly extended; its mean trouble-free runtime exceeds three times that of standard pumps, greatly cutting users’ maintenance expenditure and overall life-cycle cost. Years of field operation verify its performance has reached the advanced standard of comparable international products.
Application
By altering pump material and structure, changing seal configuration or adding a cooling system, the pump can also handle hot water, oil products, corrosive media or abrasive-containing fluids up to 185℃.
Model Explanation
Performance Features
1. High Efficiency & Energy Saving
Adopting self-developed advanced hydraulic profiles, the pump delivers high-efficiency and energy-saving performance. It is free from balance disc abrasion and rotor axial pulsation, so the impellers maintain optimum concentricity with diffusers. Conventional multistage pumps see obvious efficiency drops from balance disc wear, and forward shift of rotor assemblies, but this design eliminates balancing medium leakage, and cuts volumetric loss. Overall operational efficiency is lifted while shaft power consumption is reduced, and the unit achieves an average efficiency gain of 2%~3% compared with standard multistage pumps.
2. Innovative Structure
The rotor assembly features symmetrically arranged impellers. The axial thrust generated by each pair of impellers counteracts each other. This automatically balances the large internal axial thrust inside the pump casing without balance discs, breaking through the structural limitations of conventional multistage pumps.
3. Unique Technical Design
Equipped with proprietary throttling and pressure-reducing devices plus odd-stage balancing structures, which also serve as auxiliary rotor supports.
4. Superior Operational Reliability
Symmetric impeller layout achieves fundamental self-balancing of operational axial thrust. It removes the high-failure-prone balance disc with narrow clearance, high pressure drop, erosion and abrasion risks.Adverse impacts of axial load on component wear and system disturbance are minimized.Remaining residual axial thrust is absorbed by thrust bearings. It keeps the pump shaft under consistent tension, with even stress distribution and sharply reduced peak stress.This improves rotor rigidity and critical speed, greatly boosting running stability and reliability.
5. Excellent Anti-cavitation Performance & Extended Service Life
Optimized hydraulic and structural design, precision casting and premium wear-resistant materials are adopted. Certain variants employ double-suction first-stage impellers for outstanding cavitation resistance, enabling smooth low-noise operation and prolonged service life.
6. Improved Mechanical Seal Reliability
No axial endplay occurs on rotor parts during startup or shutdown, and no axial pulsation exists in normal operation, resolving the long-standing poor reliability issue of mechanical seals commonly seen on traditional multistage pumps.
7. Wide Application Scope
Without narrow-clearance balance disc assemblies, the pump is applicable for harsher service media than conventional multistage products.
8. Low Maintenance Cost
Precision casting reduces the number of wearing parts and overhaul disassembly frequency. It extends service life, avoids faults from frequent repeated disassembly and cuts overall maintenance expenses.
9. Easy Overhaul
The pump is developed via 3D design with CNC-machined rotors to guarantee strict dimensional tolerance and precision. Thanks to accurate positioning, ordinary technicians can complete assembly following general assembly drawings. It eliminates the need for specialized staff to adjust rotor axial float as required on old-type multistage pumps, brings great convenience to users.
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 |
