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AS High Efficiency Energy Saving Pump

Main performance parameters
● Pump outlet diameter Dn: 80~1100mm
● Capacity Q: Max 20000m3/h
● Head H: Max 320m
● Temperature T:Max 105℃
● Permissible pressure :Max 4Mpa

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Split Case Pump

分类一

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Product Description

Structure Feature

Technical Data

Precautions

Troubleshooting

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AS series high-efficiency energy-saving pump is a new generation of high-efficiency horizontal centrifugal pump developed by our company in cooperation with Xihua University for many years. In response to the current energy-saving market demand, it is integrated with the advantages of the same type of centrifugal pumps produced by well-known domestic and foreign manufacturers. AS pump concentrated use of the current advanced ternary flow design theory, computer fluid simulation technology (cfl), computer finite element analysis technology (CAE).

The efficiency exceeds the world's leading level, and has many advantages such as excellent structure, smooth operation, low noise, and easy to maintenance. It is widely used in the power industry, water conservancy industry, steel industry, petrochemical industry, water plant projects, municipal engineering, sewage treatment, Shipbuilding industry, mineral exploration and mining, aviation industry and other occasions.

Main performance parameters

Pump outlet diameter DN：80--1100MM

Capacity Q：Max 20000m3/h

Head H：Max 320m

Pressure P：Max 4MPa

Temperature T: Max 105℃

Description of Pump Type

For example： AS300-640-J-A

AS： high efficiency single stage double suction split centrifugal pump

300： pump outlet diameter(mm)

640: impeller normal diameter(MM)

J： Pump speed changed(Maintain the speed without mark)

A： Changed outer diameter of impeller (the max diameter without mark, B cut the second C is the third time )

Pump material

Casing cast iron, ductile iron, cast steel

impeller cast iron, ductile iron, cast steel, bronze, stainless steel

shaft 45# steel、40Cr、3Crl3\35CrMo

shaft sleeve Q235A 304

wear ring Q235A,bronze,duplex SS

Construction Drawing

1.The shape of the AS high-efficiency energy-saving pump is designed by a professional shape design company according to the requirements of modern industrial aesthetics，Overall beauty。At the same time, according to the CAE mechanical simulation report, the local thickening increases the safety and reliability of the pump casing.

2.The AS high-efficiency energy-saving pump retains the characteristics of the mid-open pump that can be repaired directly by opening the pump cover and the characteristic of the double suction impeller automatically balancing the axial force，At the same time set the import and export on the same horizontal axis，It is conducive to engineering installation and pipeline design and layout.

3.The shaft of the AS high-efficiency energy-saving pump adopts a double shaft extension structure, and there is no difference between the forward and reverse shafts，Except for the key groove of the impeller, no other key groove, snap ring groove and step are provided in the middle section of the shaft，and it is one grade thicker than similar pump shafts, which enhances the life and strength of the shaft

4.The impeller and double-suction sealing ring of the AS high-efficiency and energy-saving pump adopt the double-sided seal of our company patent number ZL2013 2 0499236.5，The length of the leaked water is increased, the amount of leakage is reduced, and the speed of the leaked water can be used to improve the efficiency.

5.The impeller and impeller bushing of the AS high-efficiency energy-saving pump are sealed with a copper pad, which is durable and extends the service life. A short shaft sleeve and an O-ring are added behind the impeller stop sleeve to achieve double axial and radial sealing. When installing the mechanical seal, put the outer snap ring on the positioning slot 1 to make the mechanical seal installation more convenient; After the mechanical seal is installed, the outer snap ring is retracted onto the clamping slot 2, so that the mechanical seal flushing cooling water can better flush and cool the mechanical seal.

6.The shaft seal structure of the AS high-efficiency energy-saving pump is reliable and universal. It can be used as a container box structure, but also suitable for packing or mechanical seal, fully considering the versatility and interchangeability. Fully taking into account the excellent environment and applicable life requirements of various types of shaft seals.

7.The bearing body of the AS high-efficiency energy-saving pump adopts a cylindrical structure, which is stable and reliable; It can be equipped with temperature measuring element, vibration measuring element and constant oil cup at the same time; In terms of cooling, it can be cooled by circulating water, or it can be freely cooled by fins.

8.The bearing body seal of the AS high-efficiency energy-saving pump adopts the double seal of the thread seal box skeleton oil seal，It has been tested and verified that the protection level is equivalent to the IP55 of the motor and can be operated outdoors.

9.AS high-efficiency energy-saving pump adopts clearance fit between bearing and shaft，When the bushing presses the bearing, the outer ring of the O-ring squeezes and deforms, and the entire structure becomes a tight fit. After the sleeve nut is loosened, the elasticity of the O-ring springs the sleeve away，No special disassembly and assembly tools and space are required, saving workload.

10.The bearing bracket of AS high-efficiency energy-saving pump adopts our company's patent number ZL 2013 2 0373133.4 oblique overflow groove, When debris blocks the drain hole, water can still flow out of the overflow tank, It overcomes the disadvantage that the packing water may soak the bearing and achieves the purpose of protecting the bearing.

11.The bearing body of the AS high efficiency energy-saving pump is fixed on the pump body through the bearing body pressure block，Easy to disassemble, strong interchangeability, stable and reliable.

12.A beautiful and elegant protective cover is installed between the bearing body and the shaft seal of the AS high-efficiency energy-saving pump. Ensure the safety of on-site operators and inspection personnel.

13.AS high-efficiency energy-saving pumps are tightly secured with round nuts and stop washers in the axial direction，Prevent axial movement and loosening of sleeve parts; It can also prevent the pump from loosening rotor components due to short-term reversal.

1. Inspection before starting

Be sure to check the followings:

(1) Insure pump plate fixed on foundation;

(2) Insure coupling and pump unit alignment;

(3) Insure piping connected by requirements;

(4) Insure motor installed by Installation and operation instruction;

(5) Insure the rotor of pump rotate easily (at least a circle);

(6) Insure the coupling guard installed;

(7) Insure the operator fully understand the safety specification that they should obey and the failures may be occurred;

(8) Insure the shaft seal liquid or cooling liquid lead-in by requirements;

(9) Insure the shaft seal installed by operation instruction;

(10) Insure the auxiliary device installed by operation instruction (If they exist);

(11) nsure the bearing have lubricated well, especially insure new pump grease or thin oil do not reduce or go bad;

(12) Insure the air trapped in pump escaped。

2. Shaft Seal

Open valves properly for stuffing box seal

3. Air exhaust

Pump and piping should fill of medium before starting, there are two methods: creation of vacuum or priming. If the pump operated on the suction state, exit gas by bolt hole on top of the pump casing.

Note: When creation of vacuum, evacuate air by bolt hole on top of the pump casing. When priming, open both side low pressure volute chamber of pump casing and the top plug, to get rid of pump vibration by remained air in pump.

4. Starting

(1) Close outlet valve;

(2) Open inlet valve completely;

(3) Open all auxiliary piping (cooling, heating, sealing, rinsing and lubricant liquid), and check all capacity and pressure;

(4) Starting pump after finishing above procedures;

(5) When the system starting deliver medium and the pressure reading at pressure gauge rise up, open outlet valve slowly。

Note: Forbid pump operating without liquid! Only close outlet valve when the pump start and shutdown, otherwise will damage the pump by overheating.

5. Operation

(1)

Confirm operating point

According to Q-H performance curve of pump, capacity Q varies with the actual operation head. The head depended on the system head (including the altitude difference between inlet and outlet, piping, valves, radiator and so on). So the pump actually operating point B depends on pump performance

curve Q-H and system performance curve Q-HA.

Once capacity settled, the shaft power, efficiency, NPSH settled as well. Pump has limited working range. The minimum capacity are shown as Qmin in Q-H performance curve. Maximum capacity are depended on the cross point of pump tolerance NPSH and system valid NPSHA. Adjust valve can change performance curve Q-HA of system, thereby adjust operation performance, makes pump operation stable and high efficiency.

(2) Operation management

Should pay attention to followings:

a. Pump should work stably

b. Forbid pump operating without liquid

c. To prevent medium temperature rise up, pump can not be run long period when close outlet valve

d. Generally, the bearing temperature not higher than 35℃ of ambient temperature, absolute

operation temperature less than 100℃.

e. Check oil level regularly if use thin oil. Deep groove ball bearing of grease lubrication no need routine maintenance.

f. Do not close inlet valve (if it is exist) when pump operating.

g. Periodical inspection and start jury pump.

h. Check auxiliary piping whether connected well.

i. Check elastic element of coupling, if worn replace immediately.

j. For stuffing box seal there should have a slight drip when running, push stuffing box gland gently until there is a slight drip (about 15-30 drop/min ).

For mechanical seal the seal leakage should reduce gradually. It is about 0-5drop/min after

starting few hours. If the seal leakage increase gradually and reach about 30-60drop/min, should check or adjust mechanical seal.

6. Shutdown

Close discharge valve.

Insure the pump unit stop smoothly when shutdown the motor. Pump should have a proper after-running period, cut heat source at this time, so that the delivered medium can cool down completely and avoid of producing any heat inside pump.

Close suction valve if pump stop work for a long period of time.

Close auxiliary piping, the shaft seal should use seal lubricant even though at stopped state. Evacuate all medium in pump and piping when freeze or stop work for a long-term, so as not to frost crack.

7. Storage

Every pump has inspected strictly before delivery. Recommend to adopt following procedures to store pump.

(1) Store new pump

If store pump at indoor, clean dry place and follow the storage requirements, the longest storage time is 12 months.

(2) If equipment is to be stored for long periods of time should follow below procedures.

a. Pump should keep in installation state and inspect work condition regularly. Start pump once every month or every three months (about 5 minutes). Check running condition before starting pump to insure there is enough liquid.

b. Dismantled pump from piping and check it according to section 5.1 to 5.4. Apply protective agent on inside pump casing especially the gap of the impeller, apply on suction and discharge, then cover the suction.

c. Operation after storage

Inspect and maintain completely before starting pump, especially shaft seal and bearing lubricant. Reinstall all safety protection devices according to requirement before starting.

Problem	Causes	Remedy
starting load too high	1. Starting without closing discharge valve; 2. packing too tight lead to lubricant water can not flow into; 3. Misguide by failing of overcurrent protector	1. Close the valve; 2. Loose packing or check the valve of water seal, check if packing ring against the nozzle of lubricant water, 3. Adjust current limiting threshold or repair overcurrent protector.


Packing overheating	1.Packing too tight; 2.Cooling water can not flow into packing box; 3. Damage in the surface of shaft or shaft sleeve;	1. Loose packing properly; 2.Loose packing or check if the water seal pipe clogged; 3.Repair shaft or shaft sleeve;


Packing leakage excessive	1. Packing worn; 2. Packing too loose; 3. Shaft curved or vibration; 4. Wrong packing bind; 5. Unclean seal water wore shaft; 6. Shaft sleeve worn; 7. Wrong packing; 8.The pressure of seal chamber too high or too low;	1. Replace packing; 2. Tighten packing box gland or add more packing; 3.Align or replace shaft; 4. Rebind packing; 5.Filtrate or use exterior source as seal water, repair; 6.Replace shaft sleeve; 7.Replace packing; 8. Adjust the pressure and capacity of seal liquid or use a sealing liquid from an external source.







Mechanical seal leakage	1. The nominal pressure of mechanical seal lower than actual work pressure; 2.Unreasonable reduction of Mechanical seal mounting,friction components not contact effective; 3. The rust of shaft sleeve surface cause rotating seal ring of mechanical seal sealing failure; 4. The delivered medium physical and chemical property causes O-ring loss elasticity; 5. The delivered medium physical and chemical property causes spring mechanical seal of loss elasticity; 6. Impurity enter friction components and damaged their surface; 7. The liquid of friction components volatilize that cause their surface burning-out;	1. Change the type of mechanical seal; 2. Reinstall; 3. Clean shaft sleeve or change their material; 4. Change material; 5. Replace or change material; 6. Filtrate or use exterior source as rinsing water; 7. Adjust rinsing medium or measure;






Bearings over heating	1.Improper centering; 2.Improper adjustment or resonance in piping; 3.Overlarge .axial force; 4.Unbalance rotor ; 5. The rigidity of foundation not enough; 6. Incorrect bearing installation or improper clearance; 7. Wore or loosened shaft; 8. Improper lubrication; 9. Oil splash ring can not get oil; 10. Poor circulation in pressure lube;	1. Readjust; 2.Readjust;reduce piping if necessary; use vibration-absorptive material;check and repair; 3. Check and adjust special working point;check capacity and running state; 4. Rebalance; 5.Strengthen the rigidity of foundation; 6. Check and choose bearing with properclearance; 7. Check and replace bearing; 8. Check the amount of oil first, too much or so little will affect operation, then check the quality of oil, especially applicable temperature; 9.Check and eliminate, the causes of can not get oil may related with oil quality, speed,wore of oil splash ring and oil circulation; 10. Check the system of pressure lube;









Vibration and noisy	1. Special working point B is not design point;not design point; low or high will cause vibration and noisy; 2. Insecure foundation; 3.Loosened anchor bolt; 4.Insecure piping supports; 5.Piping resonance; 6.Cavitations; 7. Air cell in medium or piping leakage; 8.clogged inlet or outlet of impeller; 9. Improper centering; 10. Unbalanced pump rotor or motor rotor; 11.Worn coupling pin or unhealthy coupling connection; 12. Worn bearing; 13. Shaft curved; 14. Friction in rotating elements; 15.Loosened or broken rotating elements;	1. Adjust system special working point or pump design parameters; 2. Strengthen foundation; 3. Tighten anchor bolt; 4. Strengthen piping supports; 5. Expanding the distance between pump discharge and elbow, use vibration-absorptive material in piping connection, adjust piping arrangements; 6. Rise water level, reduce suction line loss, increase suction pressure by using inlet throttle valve;improve pump cavitations performance; 7. Check and eliminate, add discharge valve; 8. Clean impeller, clean impurity of pump and piping, check strainer and suction nozzle; 9. Recentering; 10.Rebalance; 11. Replace pin, rotate coupling 180°, eliminate error of pin hole, adjust the unit to insure there is a necessary clearance in coupling; 12. Repair or replace bearing; 13. Align or replace shaft; 14. Eliminate friction; 15. Eliminate, replace worn parts;














water attack	Air in pump or piping	Evacuate air and eliminate the causes
Pump starts pumping then stops	1. Clogged in suction line or impeller; 2. Air cell in piping; 3. Lift too high （valid NPSH too low）; 4. Air enter shaft seal; 5. Water level decrease too much;	1. Clean impeller, clean impurity of strainer and suction piping; 2. Improve suction line, adjust piping arrangements, add discharge valve; 3. Increase entrance pressure, increase suction pressure by using inlet throttle valve; low the height of pump installation; change suction line if too much line loss; 4. Check pressure and amount of seal liquid if they are suitable operating requirements, replace packing or other shaft seal, check the mounting position of water seal ring; 5. Rise the lowest water level, increase entrance pressure, increase suction pressure by using inlet throttle valve;

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Add: Jiuhua Industiral Park,Xiangtan City,Hunan Province,China

Call us:+86-0731-55599916
+86-18673110460

Email:export@mwpump.com

Hunan M&W Pump Co., Ltd 湘ICP备14003804号-2 www.300.cn Manager

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