Pump performance testing

 Pump performance test processing

Pump performance test of pump manufacturers in china

Pump performance test of pump supplier in china

  1. Check the order information, confirm the capacity, head, efficiency, and power of the pump be tested, and confirm the diameter of the pump flanges;
  2. according to the diameter of the pump flange, tested pump power, select the appropriate test pipeline and test motor;
  3. connect the test pipeline, test motor, power supply and instrumentation sensors;
  4. measuring the ambient atmospheric pressure, water temperature, inlet surface distance;
  5. Input the capacity, head, efficiency requirements, gauge distance, atmospheric pressure and water temperature of the tested pump into the test software;
  6. Vacuum is drawn to fill the pump chamber and the suction line with water;
  7. Jog the water pump to confirm the correct rotation direction ;
  8. start the pump;
  9. Excluding the gas in the pressure sensor pipeline;
  10. Take the point test according to the pump capacity (record the vibration and noise of the pump at the rated point. If you need to confirm the pump bearing temperature rise up, you need to run the pump for 70 minutes , then testing temperature rise up and record it)
  11. Form a pump performance test report and print the test report;
  12. Determine the test results according to the order requirements;
  13. If the judgment is passed, go to the next process;
  14. If the judgment is unqualified, return it to production for improvement, and repeat the above steps after improvement.

pump manufacturers in china|eu-flo pump

pump supplier in china|eu-flo pump

Pump Burning Sliding Bearing’ Reason

What can cause of the water pump burning Sliding bearing of pump manufacturers in china?

What can cause of the water pump to burn the Sliding bearing of pump suppliers in china?

1 lubricating oil pressure is too low, the oil supply is insufficient;

2 The lubricating oil circuit is blocked, resulting in dry grinding of the bearing bush;

7 motor vibration, excessive gap;

4 lubricating oil is not good quality, water or impurities are too much, the lubrication effect is not good

Treatment method: stop the pump, contact the mechanical repair factory for repair


pump manufacturers in china|eu-flo pump

pump supplier in china|eu-flo pump


Water Lubrication Bearing

Water Lubrication Bearing
Water Lubrication Bearing


JDB  Seria Water Lubrication Bearing Size

JDB Water Lubrication Bearing


10141014101408101410101412101415 101420        
18 121810121812121815121816121820121825121830      
 131910 131915131916         
14201420 142010142012142015 142020142025142030      
15211521 152110152112152115152116152120152125152130      
16221622 162210162212162215162216162220162225162230162235162240    
18241824  182412182415182416182420182425182430182435182440    
28 202810202812202815202816202820202825202830202835202840202850   
  223212223215 223220223225       
25332533  253312253315253316253320253325253330253335253340253350253360  
30383038  303812303815 303820303825303830303835303840303850303860  
45     354520354525354530354535354540354550354560  
40504050     405020405025405030405035405040405050405060405070405080
50605060       506030506035506040506050506060506070506080


50655065206530 5065405065505065605065705065805065100    
70  557040557050557060557070      
63756375    637560637570637580     
65806580   658050658060658070658080     
70907090   709050709060709070709080     
75907590    7590607590707590807590100    
75957595    7595607595707595807595100    
80968096  80964080965080966080967080968080961008096120   
100  801004080100508010060801007080100808010010080100120 80100140 
9011090110   90110509011060901107090110809011010090110120  ,,


100120100120    100120601001207010012080100120100100120120 100120140 
120140120140      12014080120140100120140120 120140140 
145       125145100125145120   
130150130150       130150100 130150130  
140160140160       140160100  140160140 
150170150170       150170100   150160140
160180160180       160180100   160180150


Normal Unit Conversion Table

centrifugal pump normaly unit and conversion table

The unit conversion table is on tooling of flowing media.

1.Volume & flowrate conversion table

Volume & flowrate unitL/sL/minm3/hm3/minm3/sgal(UK)/mingal(US)/minft3/hft3/minft3/s
     remarkL/sL/minM3/h M3/M  M3/SUK GPMUS GPMCFHCFMCFS


2.Pressure unit conversion table

Pressure UnitMpabarkgf/cm2atmmmH2OmmHglbf/in2(psi)1 kgf/cm2




1 mmHg





remarkMpaBarKg force /cm2Standard atmospheric pressureMillimeter water columnMillimetre mercuryPound force /inch2


3.Power unit conversion table

Power unitkWkgf·m/sPSHP1W=1J/s=1N·m/s  1kcal/h=1.163W  1kW=859.845kcal/h
1 kW1101.9721.359621.341021Btu/h=0.29307W  1W=3.412 Btu/h   1HP=550ft·lbf/s
1 kgf·m/s9.8067×10-311/75=0.013330.013151W=1J/S=1N·m/S   1K cal/h=1.163瓦
1 PS0.73557510.986321Kw=859.845K cal/h     1 Btu/h=0.29307瓦
1 HP0.745776.0401.013911W=3.412 Btu/h    1 hp=550ft.lbf·/s
RemarkKwKg force·.m/SMetric HPImperial HP1 RT=3024 K cal/h=3.5169 Kw


4.Force Unit conversion table

Force UnNkgflbfkNtf1kgf=1kp(kilopond)


=105 Dyne

RemarkNKg ForcePound ForceKNTon Force






5.Torque Unit conversion table

1 N·m10.101972
1 kgf·m9.806651
RemarkN·mKg force·m






6.Temperature Unit conversion table

Temperature unitt(℉)=[t(℃)×9/5]+32 

t(℃)=[ t(℉)-32] ×5/9

T(K)=273.16+ t(℃)

Delta T:△t(℉)= △t(℃) ×9/5

△t(℃)= △t(℉) ×5/9



K- Kelvin (thermodynamic temperature unit)

T- Thermodynamic temperature (absolute temperature)














7.Speed Unit Conversion table

Speed unitm/sm/minft/minft/s
1 m/s160196.853.281
1 m/min0.016713.2810.0547
1 ft/min0.00510.304810.0167
1 ft/s0.304818.288601
















8.Volume unit conversion table

Volume unitm3cm3dm3=Lin3ft3yd3fl.oz.(UK)fl.oz.(US)gal(UK)gal(US)
1 m311×1061×10361023.735.314671.3079535.195×10333.184×103219.969264.172
1 cm31×10-610.0010.0610235.31×10-61.31×10-60.03520.033810.000220.00026
1 dm31×10-31000161.02370.035310.0013135.195233.81380.219970.26417
1 in316.3871×10-616.38710.0163910.0005821.43×10-60.576750.554110.00380.00433
1 ft328.3168×10-328316.828.3168172810.03704996.614957.4996.228837.48052
1 yd30.76455764555764.5554665627126908.525852.4168.178201.972
1 fl.oz.(UK)28.413×10-628.4130.02841.733880.0010.000410.960750.006250.00751
1 fl.oz.(US)29.5735×10-629.57350.02961.80470.001040.000041.0408510.006510.00781
1 gal(UK)4.5461×10-34546.094.54609277.420.160540.00595160153.72111.20095
1 gal(US)3.7854×10-33785.413.785312310.133680.00495133.2331280.832671
remarkm3cm3Decimeter 3=Litreinch3foot3yd3UK ounce (liquid)US ounce (liquid)Uk GallonUS Gallon


9.Area unit conversion table

Area unitcm2m2km2in2ft2yd2
1 cm210.00010.1×10-90.1550.001080.00012
1 m21000011×10-6155010.76391.19599
1 km210×1091×10611.55×10910.7639×1061.196×106
1 in26.45160.645×10-30.645×10-910.006940.00077
1 ft2929.030.092992.9×10-914410.11111
1 yd28361.270.836130.836×10-6129691
remarkcm2m2km2inch2foot2 yd2


10.Mass unit conversion table

Mass unitgkgtozlbUS tonUK ton
1 US ton907185907.1850.9071932000200010.89286
1 UK ton1.016×1061016.051.016053584022401.121
remarkgKgTonounce (uk ounce)poundMetric T(short T)Uk T(
Long ton)


11.Length unit conversion table

Length UnitmmcmmKminftyd


Pneumatic Submersible Pump


 EBB3-36 Pneumatic operation Submersible pump

   The pneumatic Submersible pump for Marine       

 EBB3-36 type pneumatic pump is a kind of explosion-proof air operation Submersible pump, EBB3-36 type pneumatic pump is widely used, safe and reliable, can work continuously, EBB3-36 type pump is pneumatic operation pump

EBB3-36 type pneumatic pump is a mechanized tool with compressed air as power medium, which has the characteristics of small volume, high efficiency, safe and reliable, and continuous operation.

EBB3-36 Pneumatic operation submersible pump is widely used in shipbuilding, coal mines, construction, power stations, chemicals and other industries of sewage, water drainage and irrigation, but also flammable, explosive and other bad work of the only ideal tool

DATA OF EBB3-36 Pneumatic Operation Submersible Pump 

Head: ≥20m

Flowrate: ≥335min

no-load speed: 6000rpm

load gas consumption: 50L/S

Air Pipe Inner Diameter: 13mm

outlet thread: G11/2in

Pump Height: 500mm

Pump Weight: 17kg



Capacityunloading(r/mi n) 


Air Pipe Dia(m m)Thread (i n) 


Head(m)Capacity (l/


Pneumatic Submersible Pump
Pneumatic Submersible Pump

Centrifugal pump use Visual automatic oiler


Centrifugal pump use of Visual automatic oiler
Centrifugal pump use of Visual automatic oiler

Centrifugal pump use Visual automatic oiler

Centrifugal water pump use Visual automatic oiler


Visual automatic oiler instructions

The 1741-V visual automatic oiler is designed for long-term stable lubrication and oil supply.

The visual auto-oiler consists of a medium-duty spring (green), a light-duty spring (orange) and a heavy-duty spring (black). When used, the correct spring is selected according to the lubricant. #0-#3 grease can be used.


All models of lubricant oilers (both manual and electric) have a standard lubricant coupling for grease to the oil cup and embedded fuses to prevent overfilling or cup pressure Too high.



Interface thread 1/8 NPTF

Interface (butter): standard

Capacity: 2.2 cubic inches, about 3300ml

Maximum pressure relief: 15PSI (about 1kg)

Lubricating oil pressure: see table below


Spring full cup empty cup 1. Screw the thread interface into the bearing to lubricate

337421-1 Orange 0.23kg 0.147kg Note: With a hex wrench, do not tighten the oil cup with your hand.

337421-2 Green 0.307kg 0.193kg Damaged

337421-3 Black 0.387kg 0.240kg 2. Use grease coupling to add grease

  1. Add grease to the following

Safe use specifications a. Side view if the plunger line to the lid angle is found.

  1. Please add oil to the oil cup according to the installation and operation instructions. Do not overfill b. Look down and find the indication point on the plunger to reach the red line of the cup cover.
  2. Carefully remove the lid and the lid is spring loaded.

Note: Once the oil cup is too full, too much lubricating fluid will flow out of the oiler’s lid and relieve pressure. All normal operations will be carried out.

Replace the spring:

Choose the right spring according to the grease.


Press and open the lid, then rotate the lid counterclockwise and release the pressure.

Note: The lid of the cup is equipped with a spring. It cannot be removed quickly and needs to be carefully removed.

  1. Remove the spring from the cup.
  2. Install the new spring into the cup

Note: Make sure the spring is installed in place on the cup and plunger

  1. Press and install the lid onto the oil cup and turn it clockwise until the pressure is right.




1 Remove the oiler from the bearing housing

  1. Open the lid as above
  2. Remove the spring from the cup
  3. Insert the stick into the center hexagon and push the plunger out of the cup.
  4. Gently clean the parts with a clean, soft cloth.
  5. When reinstalling, apply a layer of film on the oil cup and plunger with grease to lubricate.
  6. Press the lid under the hand and rotate it clockwise to the proper pressure.

Pump Common Faults and Troubleshooting Methods

Split Case Pump Faults
SPlit Case Pump Eu-Flo

Pump Common Faults and Troubleshooting Methods

capacity no enough or no out water

1:motor reverse

2:flow channel been clogging

3:density of medium is too high

4:required head too high or the pump head selection smaller than actual required head

5:impeller been wear

6:water lever is too lower and been suction air

7:check valve installation reverse   (way adopt to trouble shooting:)

1:correction motor rotation

2:clear the Debris, set a Filter Grille near by the pump suction

3:Diluted the flow medium with water

4:try to lower required head( for example to change big diameter pipe and smoother pipe, reduce the elbow qty, or increase elbow Arc radius, or change into higher head pump)

5:change pump impeller

6:adjustment Floating ball Switch position, Make the lowest level meet the requirements of the mounting dimension diagram

7:Correct check valve direction

2.Cannot start

1.Phase deficiency

2.Impeller jammed

  1. Winding connectors or cable breakers

4:Stator winding Burnout

5:controlling electrical faults

way adopt to trouble shooting

1、check the line, eliminate the problem of missing phase

2、remove debris, it is best to set the filter around the pump (but not in the pump inlet installation filter)

3、Repair after checking with ohm meter

4、Repair after checking with ohm meter

5、repair, replacement winding or stator

6、Stator Burnout     (reason maybe caused:)

1、the lack of phase

2、Impeller jammed

3、winding joint or cable circuit breaker

4、Stator winding burnout

5、Control electrical fault     (way adopt to trouble shooting:)

1、configuration protection Control electrical appliances and: Find out the line, clear the fault; remove the dirt, tighten the impeller fastening screws and stainless steel spring washer; dilute the medium with water; rinse and dredge the cooling system

2、Replace the mechanical seal or “O” seal ring

3、Tighten the fasteners of each part

  1. Too large current (reason maybe caused:)

1、Pipes and impellers are blocked

2、pumping liquid density or viscosity is high

3、the selected pump head greatly exceeded the actual needs, or the use of changing conditions, the device head greatly reduced, so that the pump over the recommended flow operation (way adopt to trouble shooting:)

1、Clean up the blockage in the pipe and impeller

2、Change the density or viscosity of the pumping liquid

3、off the small outlet valve, reduce the flow, or trim smaller impeller, or replace the lower head pump

pump inducer function-multi-stage pump inducer function-centrifugal pump inducer function


centrifugal pump inducer function
centrifugal pump inducer function


pump inducer function , multi-stage pump inducer function, centrifugal pump inducer function

   The inducer is installed in front of the first stage impeller of the centrifugal pump. It is called the front inducer. When the liquid flows through the inducer, it works on the liquid to increase the energy. It is equivalent to adding work energy to the liquid entering the rear impeller, which is equivalent to The liquid entering the rear impeller is pressurized to increase the suction of the pump.


The centrifugal pump inducer is an axial flow impeller with a low blade load (only a few meters lift), a small blade installation angle, a small number of blades, and a dense cascade of cascades. It has high inhalation performance. The lift generated by the inducer acts to pressurize the centrifugal impeller behind, and the suction performance of the multistage centrifugal pump is improved, so that the suction speed of the centrifugal pump can reach about 3000. At present, the design method of the inducer is an empirical design method based on the test. There are usually two design methods: one is a flat cylindrical inducer design, and the other is a curved-leaf tapered inducer .

The way Analysis of axial flow pump vibration

  1. hand rotation Difficulty: Pump shaft bending, bearing wear, pump unit non concentric, impeller touch pump shell.

Elimination measures: Straightening pump shaft, adjustment or replacement of bearings, re-Alignment , re-adjustment gap.

  1. Pump shaft Swing degree large: bearing and shaft neck wear or gap is too large.

Elimination measures: Repair the shaft neck, adjust or replace the bearing.

  1. Hydraulic unbalance: impeller unbalance, centrifugal pump individual vane groove blockage or damage.

Elimination measures: Re-calibration of the impeller static balance and dynamic balance, elimination of blockage, repair or replacement of the impeller.

  1. Axial flow pump shaft power is too large: the water level of the inlet pool is too low, the impeller submerged depth is not enough, the clutter winding impeller, pump cavitation damage degree is different, impeller defect.

Elimination measures: Raise the water level of the inlet pool, reduce the installation elevation of the pump to eliminate clutter, and set up a bar grille, repair or replace the impeller.

  1. Mounting base vibration: Poor foundation stiffness or loosening or resonance of bottom angle screws.

Elimination measures: Reinforcement of the foundation, tightening the The anchor

  1. Centrifugal pump unit efficiency decreased sharply or the efficiency of axial flow pump unit decreased slightly, accompanied by cavitation noise.

Elimination measures: Change the speed of the pump, avoid the resonance area, find out the cause of cavitation, take measures to eliminate cavitation.

  1. Pump inlet and outlet pipeline Support force is relatively large.

Centrifugal Pump Eu-Flo Material Selection

Centrifugal Pump Material Selection Sheet

Part DescriptionMaterial Combination
Cast IronDuctile IronWCB1.43081.4408DuplexSuper DuplexBronze
CasingCast IronDuctile IronWCB1.43081.44081.44701.4410Bronze
impellerCast IronDuctile IronWCB1.43081.44081.44701.4410Bronze
ShaftSS 420SS304 DuplexSuper Duplex
Seal housingCast IronDuctile IronWCB1.43081.44081.44701.4410Bronze
Stationary RingWCB1.44701.44081.44101.4410

Eu-Flo Pump Developed New Model Liquid Gas Mixture Vortex Pump

EQYB is one Magnetic drive and Vortex pump application for Gas-Liquid Mixture, the pump is basing on many years experience of the company produce Vortex Pump and improved the design. The pump adopts magnetic transmission structure, non shaft sealing, to ensure the pump no leakage when transporting liquids containing gas , after the company’s R &D team combined with the Scientific research personnel in Colleges and Universities to developed the new model that can No load, dry grinding, high temperature resistance, energy saving and environmental protection,  to turn over a new page of the history that  Magnetic drive pump can’t runing non-load. after application of Through use of a number of customers proved that the pump not only has the characteristics of small capacity with high head, but also has the advantage of magnetic driven pump without leakage, therefore it is favored by many end users. the Pump wet parts are stainless steel or other metal materials, can be non-leakage to transport flammable, explosive, poison and other dangerous liquids, precious liquids, refrigerants or high-temperature liquids, low-viscosity liquids, corrosive liquids and harsh operation and liquid containing gases, liquid gas, liquid ammonia and other easy to gasification liquid transmission. In addition, compared with the canned pump, canned pump beside to the realization of our special functions, in small capacity application we have a very special advantage. Many customer feedback, to use of our EQYB magnetic driven pump to solve for their difficult that previous canned pump can’t for of high head with small capacity. by the other hand with a smaller power and energy saving, simple and convenient operation and maintenance, occupy smaller space, long service life, greatly reducing the operating costs. it can be fully replaceable for small capacity’s canned pump applications.

Vortex Pump Liquid Gas Mixture
Vortex Pump Liquid Gas Mixture

Flange Available for PN40,PN63, ANSI CL300,CL600