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| Address： | No.517,Xiangfu Road |
| Yuhua District, | |
| Changsha City | |
| Hunan Province, P.R.C |
DF Stainless Steel Corrosion-resistant Multistage Pump
Classification:
BB4 Multistage Centrifugal Pump
DF horizontal stainless steel multistage centrifugal pump
Key words:
water pump
Hotline:
- Product Description
- Performance Parameter
- Installation Drawings
- Installation And Use
- Faults And Solutions
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- Commodity name: DF Stainless Steel Corrosion-resistant Multistage Pump
Flow Range: 3.75~1100m3/h</br> Head Range: 50~1800m</br> Medium Temperature: 0℃～80℃</br> Allowable Inlet Pressure: 0.6MPa</br> Shaft Seal: packing seal, mechanical seal</br> Available Materials: HT200、HT250、QT600、ZG、304、316、316L、317L、904L、CD4-MCu, etc</br></br></br></br>
DF-type stainless steel corrosion-resistant multi-stage pump is designed to deliver clean water or other liquids with physical and chemical properties similar to clean water, with solid particle content ≤2% (particle size below 1 mm), solid concentration ≤5% wt and medium temperature ≤105℃. By changing material of wetted parts, adjusting shaft seal type or equipping extra cooling system, it can also handle hot water up to 210℃, oil fluid, corrosive or abrasive medium. It is a corrosion-resistant variant within sectional multistage centrifugal pump family.
Model Description:
Example: DF280-43 × 5;
DF —— Sectional Stainless Steel Corrosion-resistant Multistage Centrifugal Pump
280 —— Design rated flow: 280m³/h
43 —— Single-stage design head: 43 m
5 —— Total number of pump stages
Rotation Direction:
Clockwise when observing from motor end toward pump casing.
Material of Main Wetted Components:
All flow-pass components are available in two material categories: cast steel and stainless steel including 304, 316, 316L, 2205, 2507, etc.
Complete Supply Scope:
The complete set includes pump, electric motor and base frame; either shared common base or independent pump base is optional. The manufacturer supplies auxiliary fittings (discharge reducer, gate valve, foot valve, check valve) and spare parts (impeller, wear ring, diffuser sleeve, balance disc, shaft sleeve).
Structure Description:
D, DG, MD, DF and DY type consist of four major assemblies: stationary casing assembly, rotor assembly, bearing assembly and shaft seal assembly.
1. Stationary Parts
Consists of suction casing, middle casing, discharge casing and diffusers. All sections are fastened together via through tie bolts to form hydraulic working chambers.D type: Horizontal suction port, vertically upward discharge port.DG type: Both suction and discharge ports face vertically upward.MD, DF, DY type: Standard horizontal suction and vertical discharge; vertical suction & discharge design is available upon customized request.
2. Rotor Assembly
Composed of pump shaft, impellers, balance disc and shaft sleeves. The shaft transmits driving torque to impellers; balance disc offsets axial thrust; replaceable shaft sleeves mounted on shaft protect the shaft from abrasion.
3. Bearing Assembly
Includes bearing housing, bearings and bearing gland.85-67, 155-67, 600-60 adopt sleeve bearings with oil bath lubrication; rolling bearing structure is optional for 85-67 and 155-67.All other types use grease-lubricated rolling bearings.
4. Shaft Seal
Standard configuration is soft packing seal, composed of stuffing box, packing and water slinger fitted on suction casing and end cover. Pressurized sealing water fed into stuffing box performs water sealing, cooling and lubrication.D type: Sealing water sourced from internal high-pressure pump medium.DG, MD, DF, DY type: Sealing water from internal process fluid or external service water; mechanical seal is widely adopted as alternative for these four pump series.
5. Drive Arrangement
The pump is directly driven by prime mover via flexible coupling. Rotation is clockwise when viewed from prime mover side.
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Performance Range：
Flow Range: 3.75~1100m3/h
Head Range: 50~1800m
Medium Temperature: 0℃～80℃
Allowable Inlet Pressure: 0.6MPa
Shaft Seal: packing seal, mechanical seal
Available Materials: HT200、HT250、QT600、ZG、304、316、316L、317L、904L、CD4-MCu, etc
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Outline Installation Drawing of DF Stainless Steel Corrosion-resistant Multistage Pump
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DF Stainless Steel Corrosion-resistant Multistage Pump Installation & Operation Instructions
Assembly Sequence
1. Fit wear rings tightly onto the suction casing and diffuser retainer respectively.
2. Install diffuser casings onto middle stage casings, then mount diffuser retainers to all middle stage casings.
3. Pass the shaft pre-fitted with shaft sleeve A and shaft sleeve B through the suction casing, then fit the first impeller. Lay a paper gasket on a middle stage casing and install the casing; fit the second impeller afterward. Repeat the above procedures to assemble all impellers and middle stage casings sequentially.
4. Mount balance ring, balance sleeve and discharge casing diffuser onto the discharge casing separately.
5. Secure the discharge casing onto the assembled middle stage casings, then fasten the suction casing, all middle stage casings and discharge casing together with through tie bolts.
6. Install balance disc and shaft sleeve B (not applicable for Model 50DB pumps).
7. Fit a paper gasket to the end cover and mount the end cover onto the discharge casing; sequentially pack stuffing, stuffing ring and gland into the stuffing boxes of the suction casing and end cover.
8. Mount bearing housings onto the suction casing and end cover respectively and fasten with bolts.
9. Fit bearing spacer and ball bearings, then lock in place with lock nuts.
10. Fill proper amount of calcium grease into bearing housings; fit paper gaskets onto bearing caps and secure caps to bearing housings with screws.
11. Fit coupling assembly, air vent cock and all square pipe plugs.
Disassembly shall follow the reverse order of assembly steps above.
Field Installation
Pre-installation Preparation
1. Inspect the pump unit and matching electric motor.
2. Prepare required tools and lifting equipment.
3. Check the pump foundation concrete base.
Installation Procedures
1. Where the pump set is delivered complete with a common baseplate pre-assembled with motor, pump and motor need not be detached during base leveling.
2. Place the baseplate on the foundation; insert tapered shims near anchor bolt locations to elevate the baseplate by 20～40 mm, reserving space for subsequent cement grout filling after leveling.
3. Check baseplate levelness with a spirit level. Tighten anchor nuts after leveling and fill the base recess with cement grout.
4. Recheck baseplate levelness 3 to 4 days after cement fully cures and hardens.
5. Thoroughly clean dirt and debris from mating surfaces of base supports, pump feet and motor feet before seating pump and motor onto the baseplate.
6. Level the pump shaft and partially fasten fixing nuts to prevent displacement; mount the motor afterward, inserting steel plates under motor/pump feet for leveling where needed. Maintain specified clearance between the two coupling halves.
7. Lay a straightedge across the coupling outer periphery to check coaxiality between pump and motor shaft centers. Adjust by inserting thin shims under pump or motor feet until the outer circles of both coupling halves align evenly against the straightedge. Replace stacked thin shims with a single machined solid steel plate, then re-inspect alignment.
For alignment acceptance check: use a feeler gauge to measure coupling face gaps at multiple opposite positions around the circumference. The tolerance limits are as follows: the difference between maximum and minimum coupling face clearance around full circle ≤0.3 mm; radial offset (vertical or horizontal) of shaft centerlines ≤0.1 mm.
Startup & Shutdown Operation
1. Clean off residual grease smeared on the shaft and other lubricated components.
2. Degrease bearings and oil chambers with gasoline and wipe dry with cotton rags.
3. Fill bearing housings with calcium-based grease.
4. Carry out no-load test run to verify correct motor rotation direction; reverse rotation is strictly forbidden as it may loosen shaft lock nuts before formal startup.
5. Prime the pump casing by filling liquid or priming from suction side for dry pump startup.
6. Fully close the discharge gate valve and pressure gauge cock.
7. Complete above preparatory steps, start the motor and open the pressure gauge cock immediately.
8. Once the pump runs at rated speed and the pressure gauge shows stable working pressure, open vacuum gauge cock and gradually open the discharge gate valve until reaching required operating pressure.
9. For pump shutdown: slowly close the discharge gate valve first, shut off vacuum gauge cock, cut off motor power supply, then close pressure gauge cock.
10. If the pump will remain out of service for an extended period, fully disassemble the pump, drain all residual water from components, apply anti-rust oil on all sliding contact surfaces and store all parts properly.
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DF Stainless Steel Corrosion-resistant Multistage Pump Routine Operation Notes:
1. Monitor pump bearing temperature: the temperature rise shall not exceed 35℃ above ambient temperature, and the maximum bearing temperature shall not exceed 75℃.
2. Normal leakage from stuffing box shall be no more than 15 mL per minute; adjust the compression of the stuffing gland at any time as required.
3. Inspect the coupling regularly and keep track of temperature rise of the motor bearing.
4. Shut down the pump immediately for fault inspection if abnormal noise occurs during operation.
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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 |
