Recommend Products
Contact Us
| Email: | info@sanchangpump.net |
| Hotline： | +86 181 4266 2779 |
| +86 193 1300 1794 | |
|
Wechat： |
+86 181 4266 2779 |
|
WhatsApp: |
+86 181 4266 2779 |
| Address： | No.517,Xiangfu Road |
| Yuhua District, | |
| Changsha City | |
| Hunan Province, P.R.C |
Double-inlet Sectional Parallel Pump
Classification:
BB4 Self-balancing Multistage Pump
Key words:
Head Range: 80–500 m (adjustable by changing impeller stages)
Rotational Speed: 1480 r/min / 2980 r/min
Medium Temperature: ≤80℃ for clean water ; ≤105℃ for hot water
Wetted Parts Materials: Cast Iron HT250, Ductile Iron QT600, Cast Steel, Stainless Steel 304 / 316
Hotline:
- Product Description
- Performance Parameter
- Installation Drawings
- Installation And Use
- Faults And Solutions
-
- Commodity name: Double-inlet Sectional Parallel Pump
Flow Range: 50–2,700 m³/h <br/> Head Range: 80–500 m (adjustable by changing impeller stages) <br/> Rotational Speed: 1480 r/min / 2980 r/min <br/> Medium Temperature: ≤80℃ for clean water ; ≤105℃ for hot water <br/> Wetted Parts Materials: Cast Iron HT250, Ductile Iron QT600, Cast Steel, Stainless Steel 304 / 316 <br/> <br/>
I. Product Overview
The double‑inlet sectional parallel pump is designed with dual suction nozzles and symmetrically arranged impeller rotor assembly. Two independent flow passages converge inside the discharge casing before medium outlet to realize parallel flow path layout. This structure completely balances the axial thrust of internal rotor components, featuring compact construction, zero external leakage, high efficiency and stable operation. It is a new optimized variant of self‑balancing horizontal multistage centrifugal pump series.
Designed for large flow and high head, this pump serves as an effective complement to single‑stage double‑suction horizontal centrifugal pumps and conventional self‑balancing horizontal multistage pumps. Widely applied in municipal water supply, hydraulic engineering, petrochemical and other working conditions requiring large flow and high head, it replaces the traditional multi‑pump serial water supply scheme with single‑stage double‑suction pumps and completes water delivery in one unit, greatly cutting project investment and routine operation & maintenance costs.
II. Product Features
1. Separate suction flanges are arranged at both pump ends with an integrated discharge port at the middle section. Impellers are installed in opposite symmetric layout to fully counteract total axial thrust by hydraulic force. Balancing disc and relevant auxiliary fittings used on standard multistage pumps are eliminated to optimize overall pump construction.
2. The bilateral suction design removes balance return pipelines, fundamentally eliminating volumetric loss caused by circulated balancing medium and reducing unnecessary power consumption.
3. High‑pressure liquid is confined within middle pump casings, while shaft seal positions on two ends work under continuous low‑pressure environment, greatly improving operating conditions for mechanical seals and lowering leakage failure rate remarkably.
4. Elimination of consumable middle casing throttling sleeves reduces spare part replacement cost and hydraulic loss from clearance leakage, helping improve overall pump efficiency.
5. Side suction semi‑spiral suction chambers are equipped on suction ends to stabilize incoming flow, restrain vortex generation and optimize fluid inflow pattern into impellers. The pump delivers excellent anti‑cavitation performance and fits low‑level suction conditions.
III. Model Description
Example: MDP360-60×5 double-inlet self-balancing multistage pump:
MD —— Mine‑use abrasion resistant multistage centrifugal pump
P —— Self‑balancing design
360 —— Design rated flow: 360 m³/h
60 —— Single‑stage design head: 60 m
5 —— Total impeller stages: 5 stages
IV. Structural Description
The double‑inlet sectional parallel pump mainly consists of pump casing assembly, rotor assembly, bearing assembly, sealing assembly, base for inlet & outlet piping and coupling. Details of each component are as below:
1. Pump Casing Assembly: Composed of suction casings, middle casings, discharge casing and diffusers, integrally cast from premium cast iron, ductile iron or wear‑resistant cast steel with outstanding pressure resistance, corrosion resistance and anti‑deformation property. Sectional construction ensures reliable sealing; impeller stages can be added or removed flexibly to match required head.
2. Rotor Assembly: Core power component made up of pump shaft, symmetric reverse‑rotating multistage impellers, shaft sleeves and locating sleeves. Impellers on left and right sides feature opposite rotation direction and equal quantity; generated axial forces offset each other fully during operation. The rotor runs centered without axial shifting or eccentric abrasion, effectively extending service life of bearings and impellers.
3. Bearing Assembly: Equipped with high‑precision rolling or plain bearings, available in grease lubrication or oil bath lubrication. Low friction loss and superior heat dissipation enable long‑term continuous high‑speed operation with easy maintenance and low breakdown rate.
4. Sealing Assembly: Configured with mechanical seal or packing seal for reliable sealing against medium leakage and air ingress. Custom wear‑resistant & high‑temperature resistant sealing materials are selectable according to medium temperature, working pressure and impurity content for diversified working conditions.
5. Base & Transmission Assembly: Integral steel base features excellent vibration damping and stable installation. The coupling connects motor and pump for high‑efficiency power transmission and smooth operation to avoid eccentric vibration.
V. Applicable Operating Conditions
With merits of large flow, high head, stable performance, superior anti‑cavitation capacity and low maintenance cost, this pump handles clean water and liquid containing trace fine solid particles:
1. Mining Industry: Drainage for high water inflow underground mines, pit dewatering and clean tailing slurry transportation. MDSP mine‑specific model is available with MA coal safety certification for underground explosion‑proof continuous operation.
2. Municipal Water Supply: High‑rise building water supply, long‑distance mountain water conveyance, raw water boosting for waterworks, pipeline supplementary circulation and reservoir water lifting projects.
3. Infrastructure Construction: Dewatering for tunnels, subways, foundation pits and bridge construction sites, suitable for rapid large‑flow drainage and variable liquid level suction.
4. Industrial Application: Boiler feed water, factory process clean water circulation, low‑pressure oilfield water injection, production water boosting and HVAC chilled/hot water circulation.
5. Other Fields: Large‑scale farmland irrigation, hydraulic water lifting, dock drainage and all‑day nonstop pressurized water delivery projects.
Applicable Medium: Normal‑temperature clean water, industrial freshwater and water with trace silt impurities; standard medium temperature: 0～80℃, customized hot water version up to 105℃.
VI. Standard Supply Scope:
Complete set includes main pump unit with preassembled rotor, bearing & sealing components, common steel base, coupling with safety guard, standard specified electric motor, anchor bolts and inlet/outlet flange gaskets. Full technical documents such as factory certificate and operation manual are provided. Valves, instrumentation, electric control cabinets and spare wear parts are available as optional extras upon customer order.
Hunan Sanchang Pump Industry Co., Ltd. provides customized production for this series of pumps. Inquiries are welcome.
-
Flow Range: 50–2,700 m³/h
Head Range: 80–500 m (adjustable by changing impeller stages)
Rotational Speed: 1480 r/min / 2980 r/min
Medium Temperature: ≤80℃ for clean water ; ≤105℃ for hot water
Wetted Parts Materials: Cast Iron HT250, Ductile Iron QT600, Cast Steel, Stainless Steel 304 / 316
-
Key Points for Installation & Operation of Double-inlet Sectional Parallel Pump
Ⅰ. Installation Requirements
1. Foundation Leveling: Level the base firmly with shim plates; fasten anchor bolts tightly to avoid vibration and ensure no tilt.
2. Coupling Alignment: Align the coupling between pump and motor. Rotate rotor by hand smoothly without jamming or abnormal noise.
3. Double Suction Piping (Critical): The two suction pipelines on both sides shall feature identical pipe size, length and flow resistance to guarantee even incoming flow for valid self-balancing; no pipeline weight shall bear on pump flanges.
4. Discharge Piping: Install gate valve, check valve and flexible connector on each pump discharge port to prevent reverse water backflow and pump reverse rotation after shutdown.
5. Keep Original Balancing Structure: Do not block or modify the factory-built balancing pipe and balancing structure of the pump.
Ⅱ. Startup Operation
1. Pre-startup: Fully open both suction valves, fill pump casing with liquid and vent all trapped air; dry running is strictly forbidden.
2. Single Pump Startup: Start pump with discharge valve closed; gradually open the valve after stable running to reach rated working condition.
3. Parallel Multiple Pumps (Key): Never start all pumps simultaneously; start the next unit only after the former runs steadily to avoid water hammer and motor overload.
Ⅲ. Operation Specifications
1. Operating pressure and motor current of all parallel pumps shall stay roughly consistent with limited deviation.
2. Long-term low-flow or dead-head operation is prohibited, which may damage self-balancing structure and accelerate bearing wear.
3. Normal running requires no violent vibration or abnormal sound; bearing temperature shall not exceed 75℃, slight dripping from mechanical seal is acceptable.
Ⅳ. Shutdown Procedure
1. Gradually close discharge valve before cutting off power to stop pump.
2. Drain all residual liquid inside pump for long-term shutdown to prevent freezing and rusting.
Ⅴ. Common Simple Troubleshooting
1. Excessive vibration & overheating: Uneven bilateral inflow, air ingress or poor coupling alignment.
2. Backflow & insufficient discharge pressure for parallel set: Damaged check valve or mismatched pump head parameter.
3. Failed self-balancing & rapid component abrasion: Unbalanced flow on double suction sides or blocked suction pipelines.
-
Troubleshooting & Remedies for Double‑Inlet Sectional Parallel Pump
1. Severe pump vibration and excessive bearing temperature
Check both suction pipelines for blockage or air leakage to ensure balanced inflow on two sides; realign the concentricity between pump and motor, fasten anchor bolts to eliminate unit looseness and resonance.
2. Medium backflow and insufficient outlet pressure under parallel operation
Repair or replace defective discharge check valves; verify model and head parameters of parallel pumps to unify operating conditions, and trim discharge valves for consistent working performance of all pumps.
3. Invalid self‑balancing and rapid component wear
Remove dirt and clear blockages from double suction pipelines, adjust pipe fittings to keep identical flow resistance on both sides; inspect unmodified and unclogged balancing pipes and restore the original balancing structure.
4. No water output or unstable discharge flow
Refill pump casing and fully vent trapped air; confirm full opening of suction valves and airtight pipelines; inspect inlet & outlet piping for clogging and clean strainers and foreign matters.
5. Heavy leakage at mechanical seal
Prevent pipeline load from pressing pump flanges and install pipe supports; avoid dry running and cavitation operation; replace mechanical seal promptly when leakage exceeds standard limit.
Previous Page
Customer Case
Product Consulting
If you are interested in our products, please leave your email, we will contact you as soon as possible, thank you!
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 |
