Pipeline centrifugal pump performance curve and the eight use erroneous zone

Pipeline centrifugal pump performance curve, there are three main pipeline centrifugal pump performance curve curve: flow - head curve, traffic - power curve, traffic - efficiency curve.

A, flow - head characteristic curve

It is the basic of centrifugal pump performance curve. Specific speed is less than 80 of the centrifugal pump has the characteristics of rising and falling (curved) under both raised among, both sides, said hump performance curve. Specific speed centrifugal pump has between 80 ~ 150 flat performance curve. Than revolutions in the more than 150 centrifugal pump has a steep fall in the performance curve. Generally said, when the traffic hours, head high, with the increase of traffic head will gradually decline.

B, flow - power curve

Shaft power is increases with flow rate, when the flow rate Q = 0, the corresponding shaft power is not equal to zero, and to a certain value (about 60% of the earth's normal operation). The main power consumption on the mechanical loss. Is full of water in the pump at this time, if the long run, will lead to pump temperature rising, the pump shell, bearing will be fever, serious when can make the pump body thermal deformation, we called "stuffy head", the head of the maximum, when gradually open the discharge valve, the flow rate will gradually increase, shaft power also slowly increase.

C, flow - efficiency curve

Xiangshan head shape, its curve when the flow rate is zero, efficiency is also equal to zero, with the increase of flow rate, efficiency is also increased gradually, but efficiency has decreased after increased to a certain value, there is a high efficiency, near the highest efficiency point, efficiency is high, the region known as the high efficiency area

Eight pipeline centrifugal pump use erroneous zone

A, pipeline centrifugal pump pipe way of matching

Some pipeline centrifugal pump users think it can improve the actual lift, but the actual head loss = total head ~ head of pump. When the water pump model is determined, the total head is certain; Head loss mainly comes from the pipeline resistance, the smaller the diameter is obviously the greater the resistance, and therefore the greater the loss of head, so reduce the pipe diameter, the actual head of pump instead of increased, it will reduce, to lower the pump efficiency. By the same token, when small diameter water pump with large water pumping, also won't erode the real value of the pump head, may because of the line in order to reduce the loss of the head with the decrease of the resistance, the actual lift have improved. There is also a machinist think small diameter water pump with large water pumping, will greatly increase the motor load, after they think diameter increases, the water in the outlet pipe of pump impeller pressure is big, so will greatly increase the motor load. Little imagine, the size of the liquid pressure only associated with head high and low, and have nothing to do with the size of the pipe sectional area. As long as the head must be, water pump impeller size remains the same, no matter how big pipe diameter, pressure effect on the impeller is certain. Just pipe diameter increases, the flow resistance will decrease, and make the flow rate increases, power consumption are increasing. But as long as within the scope of rated head, no matter how to increase the pump diameter can be normal work, and also can reduce line losses, improve the efficiency of the pump.

Horizontal slurry pump product common fault solution

Common slurry pump failures:

(1) pump is not turned;

(2) the pump flow is insufficient;

(3) packing leak;

(4) the pump vibration and noise;

(5) bearing heating;

(6) bearing life is short.

Measures:

(1) eddy shell solid hard sediment silting up, can adopt measures to remove blockages.

(2) such as impeller or in and out of the water pipe road blocks, can adopt clean impeller or pipeline. Such as impeller wear serious, should be taken to change. Such as packing leakage, pressure filler. Conveying height is too high, tube resistance loss is too big, reduce transmission height or decrease resistance, according to these the cause of the problem, yantai xin sea mining machine adopts advanced technology research and development of a variety of slurry pump, wear-resistant anti-corrosion, high head, large flow etc, and widely used in various fields.

(3) such as the axis and axis of container is different, the main reason is that great error in the processing, installation is not correct. Should be paid attention to in the inspection after installation is correct. Such as seal water ring wear serious, need to replace new water ring. Such as sealing pipe blockage, seal water not deal among packing packing wear fast, cause leakage of material. For plugging pipe dredge, keep the seal water clean.

(4) basically has the following five reasons: (1) uneven medium density. Medium density caused by uneven pump vibration occurs has just started, when the pump is normal after opening, the vibration of the pump will disappear, does not need to handle this kind of situation, just before driving, pay attention to the medium with the high-voltage wind; (2) the installation of the pump is not level. In the process of installation and operation should check the level of the pump body. (3) a cavitation, make the pump impeller imbalance. Should reduce installation height, the small water valves, import less resistance. (4) uneven suction inlet. Should improve pump feed situation, strengthen the uniform stability of the intake. (5) pump bearing clearance. Bearing clearance will lead to pump vibration is big, should pay attention to the pump at any time in the daily operation of the situation, found that different heart or pump shaft and motor shaft bearing damage should be handled in a timely manner.

(5) basically has the following five reasons: (1) not open cold water or blockage in a cooling water tank, should open the function of the cooling water or cooling waterway dredging. (2) equipment lubrication is not good. Should be in accordance with the manual adjustment quantity of lubricating oil. (3) lube oil is not clean, impurities in oil. Should clean bearing, lubricating oil. (4) thrust bearing direction is not correct. In view of the inlet pressure situation, adjust the direction of thrust bearing. (5) bearing the port congestion, lead to bearing the casing heat can't discharge, temperature rise of the device. Deal with the outlet to clean up.

(6) has the following 4 reasons: (1) motor axis parallel to the asymmetry of pump shaft or not. The motor shaft and pump shaft should be adjusted, if shaft bending deformation or replace the shaft directly. (2) bearing assembly is not reasonable. The bearing and axle load, or replace the bearing. (3) pump with friction or impeller out of balance. Should eliminate friction or replace a new impeller. (4) the lubrication is not good. Too much too little impurity will result in bearing life is short, should remove bearing clean after use.

Stop when the pump should be work and operation questions frequently

Before the pump (fan) exit door is shut, to prevent non-return door is lax, the mother tube pressure water flow back to people L - 1 tube, reversal caused by manual hydraulic test pump. How bad water against system, inverted for water pump. Pump, blower, pause and pay attention to idle away time. If time is too short, to check for grinding pump (fan) card.

For large forced lubrication pump (such as boiler feed water pump), still need to start before stop the pump auxiliary pump, in case of burning bearing shell in the process of slow down. Pump (fan) stops, should be based on the system connected to the pump (fan) is to determine whether population valve should be closed. Shut down after the exit door should be instant switch downtime. Six, pump or fan in the starting switch should be done after work can observe pump or fan starting, at the same time, should listen to the fan or pump motor. If the buzzing sound, while the motor cannot turn a switch to stop immediately, and check is not the cause of the rotation.

Check pump (fan) should be paid attention to when stuck or manual turning tests.

Check whether the motor is normal, connection is correct. Sometimes because the motor have a break and not turning.

In the running of water pump of different sounds

Loose different sound

Loose different sound by loose on the shaft of rotor and the sound, the sound is cyclical. Such as circulating water pump impeller, shaft sleeve on the axle is loose when gap (even for 1 ~ 3 mm), will send hitched hitched sound. Such as the pump shaft bending, the collision voice would have been greater, because of the impeller and shaft sleeve on the shaft has a tendency to to droop, gap appeared in the underside of the shaft. But when bend convex to upper part, will hit the impeller upward movement, no upward movement, such as impeller pump shaft convex and transferred to the lower part, impact impeller downward movement. After the pump shaft and convex to the above, to hit the impeller upward movement, so the periodic noise. It must be pointed out that in this case the movement of the water pump is very dangerous, in addition to the pump leakage caused by swinging of rotor air outside, more serious is the pump shaft and the impeller causes crack fracture along the edges (in part), etc.

Some of the rolling bearing interval sets with no bearing pressure, there will be intermittent in running the rattle of the shaft. Because of the distance the clearance between the shaft and sleeve is bigger, when it is on when the axial and is not pressure, can cause a under axial clearance, but by accident reasons above will bring clearance, due to its quality, the relationship between distance set toward the whereabouts, issued and the rattle of axis slightly.

Avoid fountain pump selection improper and operation mistakes

Improper fountain pump selection and operation error is likely to cause vibration. So, these potential causes fountain pump vibration is how to handle?

The fountain pump experts to give some advice on problem solving methods accordingly:

1, two parallel should guarantee the pump performance is the same. Pump performance curve type should slow down for good, can not have a hump.

2, pay attention to when using: eliminate cause fountain pump overload factor, such as port congestion; The time to extend pump and reduce the disturbance of the shaft, reduce the collision and friction between rotating parts and stationary parts, and the resulting thermal deformation; For lubrication of the sliding bearing, water should be added in the process of start prelubricated water, avoid dry, until the water pump water stop again after water injection.

3, to need to bearing a moderate amount of oil injection oil on a regular basis, for long axis under liquid centrifugal pump, because the shafting torsional vibration, if use have thrust tile, is damaged main thrust tile, then can improve the lubricating oil viscosity, appropriate to prevent the destruction of the liquid dynamic pressure lubrication film.

4 the amplitude of the fountain, fountain pump Suggestions to prevent the pump is too large, you can also use the vibration measurement analysis condition to determine the best working parameters of the pump.

This paper analyzes the reason of the water pump tripping

After its commissioning, the water pump work after a period of time a closing namely tripping problem happens. After ruled out the switch mechanism failure, according to the conventional method to check the cable, secondary loop connection, and the relay and the fixed value is normal, to start again and often successful. After the suspect is soft fault caused by the DCS system, but change on the control panel operation, still can appear the phenomenon. Usually the cause of the water pump tripping mainly include:

(1), use the head below the pump lift pump too much lead to traffic after the current rise and over current, controls the outlet valve opening solution to traffic control small and reduce the current to allow current range, or change small reduce pump impeller diameter.

(2) be affected with damp be affected with damp, water pump motor lead to too much electricity.

(3), water pump motor quality problem.

(4), water pump voltage instability.

(5), water pump control cabinet system problems

Mine water pump and electrical equipment inspection maintenance technology

1, mine water pump daily inspection and maintenance

1.1 the main content of the daily check

(1) check whether the vacuum gauge, pressure gauge, ammeter, voltmeter is normal; (2) check whether the bearing temperature and lubricants is normal; (3) check the presence of abnormal sound or vibration in the operation of the body; (4) check the tightness packing if appropriate; (5) check whether pipeline leakage, leakage, (6) and check the balance device with and without exception; (7) check whether there is any jam on suction door; (8) check whether there is any abnormal on motor temperature; (9) check whether there is any abnormal on initiating device; (10) check whether the terminal bolt is loose, if loose to tight; Check the cable line and grounding line is normal or not.

1.2 the main content of the daily maintenance

(1) bearing lubrication. Sliding bearing is usually every run 2000-2500 - h oil change once, can't change the oil in the operation of the rolling bearing; Lubricating oil quality to meet the provisions, different type of lubricating oil shall not be mixed use; In the operation of the gas in time, often maintain normal oil level.

(2) the change of packing. After packing wear, aging to change in time; For the installation of a new packing; Replace the packing should be in when the pump is stopped, tightness after open pump to adjust; Periodically remove suction well sundry, avoid damage to the impeller.

(3) rotation is used. Should avoid water pump motor rotation drainage pump operation, be affected with damp be affected with damp, ensure that the standby pump can be put into use at any time.

2, motor maintenance, examination

The length of the service life of the motor, and inspection and maintenance has a direct relationship. Always check the insulation resistance of the motor, motor rated voltage under 700 v is measured with 500 v megohmmeter; 700 v or 1000 v megohmmeter measurement; More than 3000 v, 2500 v megohmmeter measurement.

Motor under the condition of thermal state (75 ℃), work every kv voltage of stator insulation resistance value is greater than 1 m Ω. High voltage motor rotor winding and below 700 v low voltage motor stator coil is higher than 0.5 M Ω. When measuring the motor temperature below 75 ℃, measuring insulation resistance must be multiplied by the coefficient factor.

Motor brush to keep good sliding contact, to brush contact surface in accordance with the slip ring surface. Brush pole screw should be tightened, the distance of the brush and slip ring should be kept between the 2 mm ~ 3 mm. Brush the uniform pressure should be adjusted, lead to good contacts. Slip ring surface without sand holes pitting, no oil dirties, without powder. Brush lifting device and short circuit ring to cooperate proper, nimble and reliable.

2.1 before starting the motor should check the content

(1) mine motor must ensure that the shell is good. The grounding of the motor meet the specified requirements, no rust; The complete fastening screws, spring washer and flat washer and tighten. Anchor bolt looseness.

(2) motor environment clean and tidy, no tinder, no water; Water pump and pipeline without leakage phenomenon and avoid motor inhaled water mist.

(3) oil ring lubrication bearing, check whether the oil is unqualified, whether oil ring rotation.

(4) check the motor brush, slip rings are in good condition.

(5) the large capacity high speed motor to check whether the air duct and the valve leakage, the volume of oil bearing lubricator oil temperature thermometer and presence of abnormal.

(6) check the motor winding and power into the line is loose, and burns, bruised fastening terminal condition.

2.2 motor starts to pay attention to the problem

(1) motor running current should not exceed the rated current of the motor; Such as excessive current instability, swing check downtime.

(2) each part of the motor of the presence of abnormal noise and vibration, if an exception occurs to handled in a timely manner.

(3) the license of motor bearing temperature, ambient temperature of 35 ℃; Sliding bearing the highest permission temperature is 65 ℃; Rolling bearing the highest temperature is 75 ℃.

3, high and low voltage switch maintenance inspection

(1) the switch parts bolt, washer is complete fastening; Explosion-proof switch wiring device explosion-proof surface and its clearance to conform to the specified requirements; Locking device must be complete and reliable.

(2) the internal and external to the bolts and the ground wire connection is firm, ground wire broken area conforms to the standard; Qualified protection setting values, action quick and reliable; Each agency action sensitive and reliable; Check the oil and oil temperature of the oil circuit breaker is in accordance with the regulations.

(3) a month each part of the measurement of insulation resistance; The quarterly inspection trip of overload and voltage-absent action value is correct. Trip in 65% of the rated voltage and pressure loss, reliable trip; For more than 85% of the rated voltage and should be reliable and off.

(4) vacuum contactor to timely adjust the three-phase contact, make its closed at the same time; Often keep switch environment clean, without sundry, water spray. Each part of the switch itself clean, no grease, no dust.

4, oil-immersed rheostat and inspection, maintenance of frequency-sensitive rheostat

Horizontal multi-stage centrifugal pump order correct installation

To master the correct installation sequence, can better use the horizontal multi-stage centrifugal pump, and we all know horizontal multi-stage centrifugal pump with high efficiency, wide range of performance, smooth running safety, low noise, long life, easy installation and maintenance, etc. Therefore understanding the horizontal multi-stage centrifugal pump is necessary to correct installation order.

Horizontal multi-stage centrifugal pump installation order:

(1) unit shipped to the scene, the supplementary motor base have been installed, the leveling base can not unload the pump and motor.

(2) base on the foundation, cushion wedge iron near ground screw, will be the base mat 20 ~ 40 mm, preparation of filling slurry after leveling.

(3) use level to check the levelness of the base, pull tight anchor nut water base mud filling after leveling, after being dry cement should check the levelness again.

(4) when the unit power is larger, in order to facilitate transport may be the pump, motor and base separate packing, that requires users to install at this moment, correction of pump unit, the method such as washing:

A. will support base plane, water pump motor, dirt washed out of the plane of the net, and put the pump and motor in the base.

B. adjust pump shaft level, appropriate to tighten the nut after leveling, in case of walking.

C. hoist motor, so that the pump coupling and motor coupling to cooperate, put on the motor did;

D. adjust two coupling gap is about 5 mm, and the correction of motor shaft and pump shaft axis coincidence, the method is to put the ruler on the coupling, two couplings and the cylindrical flat feet flat, if do not overlap, should adjust the relative position of motor or pump, or pad to chip to adjust;

E. in order to check the accuracy of the installation should on the coupling on the circumference of a few different positions with feeler clearance in the plane of the two coupling, coupling plane week difference maximum and minimum clearance shall not be over 0.3 mm. Both ends of the center line of the up and down or left and right sides of difference may not be over 0.1 mm.

(5) when the unit without the base, is installed directly on foundation, its methods and 4 are similar, but should pay more attention to correction.

Above is correct horizontal multi-stage centrifugal pump installation order, hope to be able to cause enough attention, you that subsequent to better use of horizontal multi-stage centrifugal pump.

Water pump vibration analysis of the four reasons

Causes and reasons that cause vibration of the pump house building is more, both contact and interaction between some factors and the following sum up basically has the following four aspects.

1, the electrical

Motor is the main equipment units, the internal magnetic imbalance and other electrical system disorders, often cause vibration and noise. Such as asynchronous motor in operation, the stator tooth harmonic magnetic flux interactions among stator radial alternating magnetic force, or a large synchronous motor in operation, the stator magnetic center inconsistent or air gap difference exceeds allowable deviation value in all directions, etc., can cause motor periodic vibration and noises.

2, mechanical aspects

Motor and pump moving parts mass unbalance, churning out, installation quality bad, asymmetric unit axis, the pendulum degrees more than permitted, poor mechanical strength and stiffness of the parts, bearings and sealing parts wear damage, natural frequencies and critical speed of pump and the unit has been caused by the resonance, and so on, will produce strong vibration and noise.

3, the hydraulic

Import uneven distribution of flow velocity and pressure pump, pump working liquid pressure pulsation, import and export flow, bias current and flow, the working condition of quota and the various causes of water pump cavitation, etc., are common causes of pump unit vibration. To start and stop of pump, valve opening and closing, condition change and transition process of the accident emergency stop etc., caused by the rapid changes in the pressure in the water pipe and the water hammer effect and so on, also often result in pump room and vibration unit.

4, hydraulic, and other aspects

Unit feed water flow design is not reasonable or not form a complete set, water pump unit and submerged depth, as well as the process start and stop order is not reasonable, etc., will worsen the water conditions, produce whirlpool, induced cavitation or aggravate the unit vibration and the pump house. The damage siphon vacuum block unit at startup, if gravity hump air entrainment is difficult, form siphon time is too long; Flap gate unit pat door design is unreasonable, sometimes closed constantly hit flap valve seat; Support of the pump and motor foundation uneven settlement or foundation rigidity were some reasons, will also lead to unit vibration.

Daily maintenance methods of sewage pump

To regulate the water pump maintenance program, to determine the pump is always in good running or standby state, commonly used maintenance method has the following points:

1. Check whether there is any loose phenomenon on sewage pump pipe road and the junction. Turn the sewage pump with the hand, and proved the sewage pump is flexible;

2. To join bearing the body bearing lubrication oil, should observe the oil level in oil mark the centerline, lubricating oil should be promptly replace or supplement;

3. Unscrew the sewage pump pump body of water diversion plug, pouring water diversion (or plasma);

4. Turn off the water gate and export of pipeline pressure gauge and vacuum gauge imported;

5. Motor running, and proved the motor steering is correct;

6. Open the outlet pressure gauge and imported vacuum pump after it shows that proper pressure, gradually open the gate valve, check the motor load condition at the same time;

7. Try to control the capacity and head of the sewage pump, within the scope of the specified on the sign to ensure sewage pump running at peak efficiency, to achieve maximum energy saving effect;

8. Sewage pump in the process of operation, the bearing temperature cannot exceed ambient temperature 35 ℃, the highest temperature should not exceed 80 ℃.

9. In case of abnormal sound of a sewage pump should immediately stop check reason;

10. Sewage pump in the first months of work, the oil change 100 hours, every 500 hours, after oil change once;

11. Regularly check the wear condition of shaft sleeve, wear after the larger should be replaced in a timely manner;

12. Sewage pump stopped for a long time, the pump must be opened entirely, dry moisture, rotating parts and junction packed coated with grease.

What is the cause of the water pump vibration noise

What is the cause of the water pump vibration noise? Here said the pump noise is refers to the pump body, vibration noise is made by machine, sometimes is not the scope of this paper, Shanghai weihu pump industry in the repair process of pump water pump vibration noise big reason is mainly the following aspects, the author briefly make a statistics, hope there is a reference in pump maintenance for you.

The reasons of the water pump vibration noise

Reason 1, water pump or suction tube is not completely filled with liquid.

Reason 2, suction head is too high, more than the water pump power

Reason 3, suction pressure is too close to the liquid pressure gasification

Reason 5, bottom valve is too large

Reason 6, bottom valve parts stuck due to vibration

Reason 7, suction side not fully immersed in a liquid

8, operation flow rate is far lower than the minimum flow

Reasons for 9, impeller by external factors or impeller damage of ring

Because 10, the motor shaft and pump shaft improper adjustment

Reasons for 11, the foundation is not solid

Reasons for 12, core shaft bending

Why 13, bearing wear or improper adjustment, cause eccentric shaft regulated

14,  rotor unbalance vibration

Reasons for 15 internal mechanical or hydraulic equipment, water pump failure, caused by excessive axial thrust

Reason of 16, inadequate or excessive fat cause inadequate bearing cooling, the temperature is too high

17, improper installation of the bearing

18, the sludge into the bearing

Reason for 19, water running into the bearing caused by excessive cooling moisture freezing on the bearing seat

Above summarizes the dozens of the causes of the water pump vibration noise, specific reasons will not, of course, on a pump at the same time appear so many reasons, the specific reason or want one to one correspondence, there are some problems such as bearing wear occurred is, in the pump body and disintegration to analyse the need for water pump.

Water pump capacitor old burn is what causes and solutions

Water pump capacitor old burn what reason be? May cause has the following several aspects

1, poor quality of capacitance, need to be replaced, Shanghai weihu remind pump capacitor to ensure quality.

2, long line pressure drop is too large, or other causes of pump power supply voltage is not enough, the operation level of long running from capacitor burn out.

3, water pump power supply voltage is not stable, or sudden high low, Shanghai weihu pump industry think capacitance caused easily burned.

4, pump power lines are too thin or use years long aging, carrying capacity is not enough caused burned capacitance.

Household pump why bad repair

Household pump why bad repair, mainly caused by the following reasons.

First, household pump maintenance value is not high

If it is the price of a domestic new pump may be only a few hundred dollars, if the water pump parts damaged need to replace parts, plus maintenance costs, will not forget it, so the maintenance value is not high, broken is not as good as a brand-new pump directly.

Second, the maintenance cost is high

The above said a new pump to hundreds of yuan, if repair our Shanghai weihu pump industry, for example, to the site maintenance we drove past the fuel cost of back and forth, and labor costs are a lot of, you know Shanghai here now artificial cost is higher, any industry, what is called a door-to-door repair hundreds or even higher, such as the summer air conditioning repaired now fee is not low. From this can be seen as a manufacturer for household pump maintenance cost is high, high charge the user since he is not willing to, low charge we also want to consider the cost. This is what is said above is verified maintenance value is not high.

Three, maintenance is relatively complex

Household pump small size, compact structure, in the process of maintenance needs to be remove easily lead to parts damaged ring, especially a import of pump parts is not easy to buy on the market.

Deep well submersible pump can solve drinking water demand

Deep well submersible pump in shape for the thickening processing, can meet the requirement in deep well, also to the tap water processors found in recent years, this is a method of high pressure water brought to a great extent the progress and improvement, application effect of this design to help and choice, not only can bring play to the quality, at the same time also made progress on the production efficiency and development, is currently the focus of a processing application materials.

Effect of corrosion resistance is strong

The impact of the water should not be ignored, for a long period of time to operate on the bottom, it is easy to appear water shock induced rupture or corrosion phenomena appear. So this kind of deep well submersible pump of the invention, the effect on corrosion resistance has been steady growth, is now more and more industries are chosen to use the direction and goals.

Believe that with the help of the deep well submersible pump, either from the perspective of the concept of operations, or from the perspective of the skills of operation, the application of the diving products are in conformity with the actual needs.

The four anti-corrosion measures of deep well submersible pump

 To control groundwater well pipe corrosion mainly from two aspects. One is to improve the tubing corrosion resistance, the use of the material corrosion resistance. The second is to remove or suppress some corrosion factors. Generally have the following anti-corrosion measures:

1. Made of high quality materials, good corrosion resistance pipe, connecting screw, wire rope, prolong the service life will be multiplied. Same metal material with smooth surface, as far as possible need not rough; No hardening by annealing. Stress concentration in welding mouth prone to corrosion, and should be avoided in the production and installation.

2. Coating (plating) protective layer on the surface of tubing coating protective layer (plating) has the following characteristics: electric insulation, integrity, and persistence, the besmear after material has certain adsorption and intensity, and non-toxic and economy.

3. Replace the screw Deep well submersible pump well pipe connecting screws, every year to wellhead repair replacement, had better use galvanized screw connection. Wire rope oiled or plastic pipe set.

4. To strengthen the control in a large number of heavy calcium carbonate precipitation area, try to take various measures to reduce the hydraulic jump value for water Wells, reduce feed speed, increase the filter size, increase the water area, when water demand determine the little smoke, fill gravel diameter of the upper limit.

What factors need to consider in choosing mine submersible pump

Form the structure of the mine pump of pump room, structure form and the size of the pump room interior layout, etc have influence, thus has much to do with the cost of pumping station, if the water level is low, need to build deep pumping station, choose to use vertical pump can reduce the area of the pump room, reduce cost and ensure normal mine pump suction conditions, on the premise of guarantee the cavitation does not occur, should make full use of the mine pump allow the vacuum suction height, reduce the burial depth of the pump station, reduce cost, at the same time, to avoid the pump installation height difference is too big, lead to the foundation of the pump depth uneven or entire pump station buried depth increases.

Should choose high efficiency mine pump. According to the different requirements of water supply object to the reliability of water supply, choose a certain number of standby pump, in order to satisfy the requirement in accident cases of water, in the case of are not allowed to reduce the water supply, there should be two sets of spare units, water, to allow a short time can only set a backup pump. Urban water supply system of pump station, in general, with only one spare pump. Usually the spare pump model may be the same and the biggest job in the pumping station pumps. When selecting mine pump will try to combine the region conditions give preference to the performance of the local manufacturing better products.

In processing crude oil well pump start-stop control method

Crude oil processing in the diesel fuel tank to ensure the main generator, emergency generator and diesel fire pump need. Standing water Wells provide irrigation water and fire water, by flushing water and fire water tank level control start-stop well pump. Pressure maintenance pump to keep the fire water pipe network pressure, when pressure monitoring switch monitoring to the fire water system pressure below the set value, fire pump started automatically.

Standing there were three separate closed discharge system: crude oil processing area closed discharge system, gas processing area closed discharge system and glycol closed system. Chemical and product has: demulsifier, defoaming agent, corrosion/scale inhibitor, corrosion inhibitor, deoxidizer, fungicide, flocculant, methanol. Dosing pump has four, two head and single head head, that is to say a dosing pump can note four drugs at the same time. Some dosing point into four kinds of medicament, choose four dosing pump pump number and installation space can be saved.

Once the MEW power supply fails, the main generator automatically start, can ensure that two-thirds of all intermediate crude oil and light oil production. When M EW and main spare generator failure, emergency generator, power supply for fire control, security, users. Light crude and intermediate processing, transmission, respectively. Convenient for production management and operation, and the different properties of crude oil export respectively, can improve the economic benefit.

Gas processing adopts three-stage compression, two sets of parallel operation. Condensate molecular sieve dry, decoloring, domestic has not been perfect calculation model. Emergency relief, reliable safety drain system, adopt with cigarettes, smokeless flare, discharge liquid automatic combustion.

how to clean Centrifugal pump parts?

Cleaning is an important part of the repair work, cleaning quality has great influence on the quality of mechanical repair. Using the correct cleaning method to improve the quality and reduce cost, is one of the repair workers must consider the question. Repair job of cleaning including mechanical parts of external washing and cleaning, parts cleaning can be divided into the different aims and identified before cleaning, clean before assembly and parts before plating cover or bond up the cleaning work.

Pump parts cleaning, plating cover and binding parts of cleaning the most demanding, cleaning quality is not high. Often the cause of coating or bond failure, assembly and parts cleaning quality, had a great influence on the service life of mechanical. As cleaning is unqualified, in the important friction pair of abrasive or caused by dirt clogging oil duct machinery of early wear and accidental damage, in some formal often happens in the repair work is not enough, must be pay attention to.

The list of centrifugal pump for a cleaning. The specific clear after the basic principles in detail.

1) to the impeller and seal ring and bearing internal and external surface accumulated by the scale and rust, water or compressed air cleaning, blowing off again.

2) clean water pump shell of stored oil dirties and the jointing surface rust.

3) clean water seal tube and check whether the tube is clear.

4) clean the bearing and the bearing, remove oil dirties, and cleaning oil and oil level gauge, etc. Ball bearing application of gasoline cleaning.

5) temporarily not to the assembly of parts and components, should be greased protection after cleaning.

The basic principle of centrifugal pump cleaning for all cleaning method, must fully consider the following a few basic requirements.

1) ensure that meet the requirements of clean degree of parts, in the repair of the pump, a variety of different parts, the requirement of clean degree is not the same. In the assembly, with a clean requirements higher than that of the mating parts, with higher than static matching parts, precision is higher than the precision with parts. For surface spraying, plating, bonding, the cleaning requirements are very high. When cleaning must take according to different requirements, different cleaning agents and cleaning method, ensure the quality of the required cleaning. 

2) to prevent the corrosion of the parts, the precision parts are not allowed to have any degree of corrosion. When the water pump parts after cleaning to be parked for a period of time, should consider cleaning rust resistance or consider other rust prevention measures.

3) to ensure safe operation, to prevent fire or poison the body and cause pollution to the environment.

The safety of small submersible pump is used

Small submersible pump, small and light, peasant life in farmland irrigation and water play an important role in such aspects. To avoid accidents in use process, prolong service life, its good performance, when using, should pay attention to the following points:

To install the leakage protector. Submersible pump work underwater, easy leakage power loss or even cause accident getting an electric shock. If equipped with leakage protector, as long as the submersible pump leakage power exceeds a certain value (generally no more than 30 ma), the power of the leakage protector will cut off the submersible pump, avoid the waste electricity leakage, to ensure safety.

To aerial installation of submersible pump, cable, power cord don't be too long. Submersible pump in the water or put forward do not make the cable force, lest cause the power cord rupture. Don't sink into the mud, the submersible pump work, otherwise it may lead to motor burn out because of his poor cooling motor winding. When installation, electrical insulation resistance should not be less than 0.5 ohms.

Try to avoid boot when the supply voltage abnormal. Power supply voltage and rated voltage is within 10%, the voltage is too high will cause motor overheating and burning of winding, the motor speed is reduced voltage is too low, such as amounted to less than 70% of rated speed, start centrifugal switch would be closed, due to start around the leader time electricity and heat and even burn winding and capacitors.

Do not frequently switch motor. Immediately halt this is because the pump will produce reflux, if boot, can make the motor load startup, cause the start current is too large and burn winding.

Do not let water pump overload for a long time, don't smoke sediment concentration of water, the operation of electric pump dehydration time shoulds not be too long, lest make the motor overheating and burning. Units in operation, the operator must observe whether its working voltage and current on the nameplate, within a prescribed value if they do not conform to should make the motor stop, find out the reasons and troubleshooting.

Direction of rotation of the motor to correct. Should make clear direction of rotation of the motor, there are many types of submersible pump forward and inversion are available out of the water, but the reverse when the water yield and large current, its reversal after a long time will damage motor windings. At ordinary times to check the motor, such as found by the crack, damage to the rubber sealing ring, or failure, etc., should be timely replacement or repair, prevent water infiltration submersible pump.

Fire pump adapter installment

The master project

One:the installation of a packaged fire pump adapter, should according to the interface, ontology, connecting tube, check valve, safety valve, vent pipe, the order of the control valve, check valve installation direction should make fire water can be from fire pump adapter into the system; Integrated fire pump adapter installed, according to the installation instructions.

Number of inspection: all inspection.

Inspection method: to observe the examination.

Two: fire pump adapter installation shall meet the following requirements:

1 should be installed in easy to close to the fire of the pavement or a non-motor vehicle road area, the appropriate distance from outdoor fire hydrant or fire pool for 15 ~ 40 m. check number: all inspection. Inspection method: to observe the examination.

2 fire pump adapter in the automatic sprinkler system should be set up and the fire hydrant system of the fire pump adapter difference between permanent fixed markers, and partition. Number of inspection: all inspection. Inspection method: to observe the examination.

3 underground fire pump adapter should be cast with "fire pump adapter" logo cast iron manhole covers, and in nearby setting permanent fixed markers indicating its location. Number of inspection: all inspection. Inspection method: to observe the examination.

4 wall fire pump adapter installation should comply with the design requirements. No request in design, its installation height should be 0.7 m from ground; With the door, window, hole on metope, the net distance between holes should not be less than 2.0 m, and should not be installed at the bottom of the glass curtain wall.

Number of inspection: all inspection.

Inspection method: to observe the inspected and feet.

Three: underground fire pump adapter installation, should make the distance from water inlet and the bottom cover no more than 0.4 m, and should not be less than the radius of the manhole cover.

Number of inspection: all inspection.

The method of examination: amount of feet.

The general project

Four: underground fire pump adapter well building waterproof and drainage measures.

Number of inspection: all inspection.

Inspection method: to observe the examination.

Maintenance method of centrifugal pump parts

First, packing method of maintenance

1, clean the centrifugal pump packing box, and check the shaft surface whether there is a scratch, burr, etc. Packing box should be clean, shaft surface should be smooth.

2, check the shaft jitter, rotor unbalance should be within the scope of the permit, in order to avoid excessive vibration, adverse to the packing.

3, in the packing box and shaft surface sealant or adapted to medium of lubricant.

4, to the roll packing packing, it sticks to take root and shaft neck size is the same, to conceal its packing, then cut with the knife, knife edge best 45 ° incline.

5, packing to loading by root, not to fill a few. Packing method is to take a root, which are coated with lubricant, hands each holding one end of the filler interface, along the axial, spiral, coat again from the incision into the journal. Not along the radial direction, in order to avoid interface.

6, in a material or the shaft with stuffing box size the lower hardness of the metal sleeve, push the packing deep into the box, a certain pressure and gland of shaft sleeve, make more pre compression of packing. Pre compression is 5% ~ 5%, the biggest to 20%. A week then axis rotation, remove the collar.

7, in the same way, loading the second and third. Note that when packing for 4 ~ 8, when loading, should make the interface 90 ° staggered; Two packing 180 ° staggered; 3 ~ 6 120 ° staggered, in case of leakage through interfaces.

Eight, after the last filler loading, application of gland pressure, but pressure force shoulds not be too big. Turn the shaft by hand at the same time, lead to the parabola distribution assembly clamping force. And then slightly relax a press cover. 9 and running test, if can't seal, compress some packing; If the fever is too big, loosen up. So the drip leakage and heat is transferred to the only a little so far (packing parts temperature higher than the environment temperature only 30 ~ 40 ℃), can be put into use.

Centrifugal pump packing seal assembly technology requirements, the packing seal, should comply with the regulations of the technical documentation. If no provisions, shall meet the following requirements:

1, check the shaft in the sealing components of the radial runout, without the permission of the shaft radial runout quantity within the scope of 0.03 to 0.08 mm;

2, liquid seal ring and the diameter of the shaft sleeve clearance is 1.00 ~ 1.50 mm, liquid seal ring and the diameter of the stuffing box clearance is 0.15 ~ 0.20 mm;

3, packing gland and the diameter of the shaft sleeve clearance is 0.75 ~ 1.00 mm, around the gap should be uniform;

4, the diameter of the packing gland and packing box clearance generally is 0.10 ~ 0.10 mm;

5, with the bottom of the packing ring, the bottom ring and the diameter of the shaft sleeve clearance is 0.70 ~ 1.00 mm;

6, packing pressure, liquid liquid seal ring into the hole should be aim and liquid seal tube, or slightly towards the lateral seal ring;