Vertical horizontal pipeline pump manufacturers wholesale

Vertical horizontal pipeline pump manufacturers wholesale Where? Vertical horizontal pipeline pump manufacturers wholesale where cheap? Such a problem, whether it is pipeline pump pump or pipeline pump on behalf of the user, are very concerned about this issue, are looking for quality and cheap history of horizontal pipeline pump wholesale manufacturers.

Shanghai Weihu Pump Co., Ltd., is a professional pipeline pump production enterprises, the production pipeline pump products are: single-stage pipeline pump, light multi-stage pipeline pump, high-rise building water supply pipeline pump, stainless steel pipeline pump, horizontal pipeline pump etc The company's vertical horizontal pipeline pump sales cover the entire Shanghai urban area and sell well in Zhejiang, Jiangsu, Jiangxi, Guizhou, Hunan, Chongqing, Sichuan, Xi'an, Shanghai, Anhui, Henan, Gansu, Xinjiang and other provinces and autonomous regions.

The following is Shanghai Wei Shanghai pump according to the user consultation out of the pipeline pump manufacturers wholesale-related issues:

1. How about your pipeline pump products?

A: Hello, thank you for consulting our factory pipeline pump products, Shanghai Weihu Pump has decades of pipeline pump production experience, pipeline pump production experience, the production pipeline pump products tested by the national authority of qualified departments, you can rest assured buy.

2. What are the specific models of your pipeline pump products?

A: Hello, thank you for consulting our factory pipeline pump products, our company has vertical, horizontal pipeline pump products, with dozens of signal parameters pipeline pump products, you can step on the Shanghai Wei Shanghai pipeline pump product area specific understanding .

3. You are a pipeline pump manufacturers or brokers?

Our company is a professional pipeline pump manufacturer, our company in Shanghai, Henan, Jiangsu, Xinjiang, have a production base, you are welcome to visit the study tour.

4. Pipeline pump how many pieces from the grant?

A: I produced the Shanghai Wei Shanghai pipeline pump, one from the grant to support the blank area to join sales.

Pump water, pump self-priming pump, suction pump suction

【Diversion】

    In the pump industry, the water guide specifically refers to the water. Because some of the pumps before work, you must manually add water to make the pump interior to form a closed environment, pump parts and then movement to create a partial vacuum in order to allow external water pressure in the internal and external pressure by the atmospheric pressure into the pump inlet to complete the suction action . For example, the previous rural water tank, it must first increase the water, in order to suck up the water wells.

【Self-priming】 mainly used in pumps, pumps, is a more important parameter.

    1. The meaning of self-absorption

    As the name suggests, self-absorption refers to the ability to automatically absorb water, that is, before the pump work, even if all the water pipes in the case of the air, without pre-added water, the pump will automatically pump the water pumped down below Go.

    2. Self-priming principle

    When the pump is in the air, the negative pressure (vacuum) formed by the pump work will be lower than the water pressure of the pumping port under the action of the atmospheric pressure and then discharged from the water discharge end of the pump. This process does not need to add water (guide water). With this ability to pump called self-priming pump.

    Some centrifugal or rotary vane pump before the suction, must be added in the pump chamber to form a closed environment, and then pump the formation of negative pressure in order to achieve the purpose of water. Such as in rural areas before the manual pump. No self-priming pump, every time before adding water is very troublesome.

【Suction】 suction height is called suction. Units are generally meters;

    Also known as the maximum self-priming height. Ie the maximum height (the vertical distance of the pump outlet from the surface to be pumped) that is automatically pumped up without water. Our pumps are self-priming pumps, the standard suction process refers to this situation. Some centrifugal pumps do not have self-priming capacity, the first use must be added water for the job. Some diaphragm pumps, although there are self-priming capacity, but the suction process is often associated with the inlet pipe is all the air can draw the vertical height of the water gap, which please note.

    Suction of the level, with the pump power, flow, structure and so on, but limited by the size, power, general micro-pump self-absorption process is not easy to do higher, because a maximum pressure of water pressure The height of 10.3 meters (because of an atmospheric pressure ≈ 10.3 m water column pressure), so the maximum self-suction process is about 10.3 meters. However, in actual operation, due to sealing performance reasons, the suction is generally not more than 6.5 meters.

Precautions for Vacuum Pump Selection

Vacuum pump prices, rotary vane vacuum pump, vacuum pump selection

1, the ultimate pressure of the vacuum pump should meet the working pressure of the process. It is usually chosen that the pump's ultimate pressure is less than about one order of magnitude of the process requirement.

2, each pump has a certain working pressure range, therefore, the pump operating point should be selected within this range, and not allow it to work outside the long hours of work pressure.

3, the vacuum pump at its working pressure, should be able to drain away the vacuum equipment in the process of generating all the gas volume.

4, select the vacuum unit:

   (1) When using a pump can not meet the pumping and vacuum requirements, the need for several pumps together, complement each other to meet the process requirements.

   (2) Some vacuum pumps can not work at atmospheric pressure, the need for pre-vacuum; some vacuum pump outlet pressure is lower than atmospheric pressure, the need for the former pump, it is necessary to combine the use of the pump. The combination of the vacuum pump, we call the vacuum pump unit, which can make the vacuum system to get a better vacuum and displacement. We should choose the correct combination of vacuum pump, because different vacuum pump on the gas extraction requirements are different requirements, for example: in general, Roots - rotary unit is not suitable for containing more condensable gas system.

5. When you choose the oil seal pump, you should first understand whether your vacuum system is oil pollution requirements. If the rigorous requirements of oil-free equipment, should choose a variety of oil-free pumps, such as: water ring pump, cryogenic pumps. If the requirements are not strict, you can choose a pump, coupled with a number of anti-pollution measures, such as cold trap, block oil trap, baffle, but also to achieve clean vacuum requirements.

6, to understand the gas composition was pumped, the gas contains no condensable steam, with or without particulate dust, corrosive and so on. When selecting a vacuum pump, it is necessary to know the gas composition and to select the pump for the pumped gas. If the gas contains steam, particles, and corrosive gases, should be considered in the pump inlet pipe on the installation of auxiliary equipment, such as condensers, dust and so on.

7, when the choice of oil seal vacuum pump, to consider the vacuum pump discharged from the oil vapor (soot) on the impact of the environment. If the environment does not allow pollution, should choose oil-free vacuum pump, or the oil vapor to the outside.

8, the vibration of the vacuum pump work on the process and whether the impact of the environment, if the process does not allow, should choose no vibration of the pump or take anti-vibration measures.

9, the price of vacuum pumps, operation and maintenance costs.

   Once we have taken into account the various circumstances before we can finalize a solution for your adaptation:

   (1) the minimum investment costs.

   (2) the minimum production operating costs.

   (3) the first two cases a reasonable and even distribution of feasible option

Maintenance of Vertical Centrifugal Pump

Vertical Centrifugal Pump Maintenance  

In-service maintenance and repair

      1, the inlet pipe must be highly sealed, can not leak, leak;

      2, prohibit GDL vertical centrifugal pump in the cavitation state long-term operation;

      3, prohibits GDL-type vertical centrifugal pump running in high-flow conditions, the motor over-current long-term operation;

      4, regular inspection GDL vertical centrifugal pump running the motor current value, as far as possible within the scope of the pump design to run;

      5, GDL-type vertical centrifugal pump should be in the operation of care, in order to avoid accidents;

      6, GDL-type vertical centrifugal pump should run every 500 hours to refuel the bearing;

      7, GDL-type vertical centrifugal pump for long-term operation, due to mechanical wear and tear, so that the unit noise and vibration increases, should stop inspection, the need to replace the vulnerable parts and bearings, unit overhaul period is generally one year.

      Mechanical seal maintenance and repair

      1, mechanical seal lubricating fluid should be clean without solid particles;

      2, is strictly prohibited mechanical seal dry grinding in the case of work;

      3, start before the plate pump (motor) a few laps, so as to avoid a sudden start mechanical seal fracture damage.

Checking Method of No - load Operation of Motor for Deep Well Pump

When using the vertical deep well submersible pump, how to carry on the idling operation examination to the deep well pump electric motor. The following by our deep well pump manufacturers in Shanghai weihu and we simply talk about the inspection method.

    First, check the oil, the correct amount of oil should be in the middle of the oil marked the middle position. Oil shortage should be appropriate to add 10 mechanical oil, oil should be appropriate to put too much oil.

    Second, check the wiring is completed, you can electrify for no-load operation. If the motor does not turn should immediately stop, and the power cord of any two for another then start; if the motor has not yet started, you should carefully check the power supply system is not good, whether there is two-phase power supply or power is not connected.

    Third, the motor starts to complete the speed to stabilize, the motor should be parking for mechanical inspection. The mechanical connection parts such as the emergence of loose, falling or collision and other phenomena, should be adjusted and repaired.

    Fourth, the motor no-load operation should be continued for 2-3 hours, running in time to check for irregularities or sound appears. After the end of the operation check whether the bearing overheating situation. If there are abnormal circumstances, should be adjusted and repaired immediately.

Shanghai pump manufacturers to talk about when the pump overhaul need to pay attention to what

Pump overhaul cycle is based on the operation and technical conditions to determine the unit, "Pump Station Technical Management" provides that the pump overhaul cycle: the main pump for 3-5 years or 2500-15000 hours of operation, the main motor 3-8 years or 3000-20000 hours of operation. And may advance or postpone overhaul according to the situation.

    In determining the pump overhaul cycle and workload, we should pay attention to several aspects, the following by the Chinese pump manufacturers say as follows:

     First, if there is no special requirements, try to avoid disassembly technology can be good parts and bodies.

     Second, should try to extend the maintenance cycle. According to the wear and tear parts, similar equipment running tests, equipment performance indicators to determine the pump overhaul cycle, regardless of the wear of certain parts. Therefore, the overhaul should be planned in order to ensure the normal operation of the unit.

     Third, as far as possible to avoid the demolition of all components of the unit body, especially the precision, finish, with the requirements of high components, institutions.

Shanghai pump manufacturers to talk about the structure and cooling form of centrifugal pump

In the use of centrifugal pumps, we will reduce the centrifugal pump sealing temperature to improve the efficiency and service life of centrifugal pumps, the following by our Shanghai pump manufacturers to say,

    First of all, we say that the centrifugal pump seal structure

    1, single-ended centrifugal pump seal: the use of injection-type washing, washing liquid is about 100 ℃ by the second line of wax oil, the pressure than the sealed cavity high 0.05-0.15Mpa. Gland outside the use of hot water (soft water) for rapid cooling. One cycle (ten months) can be used in general.

    2, centrifugal pump metal bellows seal: compact, easy to install, in the case of the same auxiliary system, the life of 2-3 times the normal seal.

    3, centrifugal pump double-end mechanical seal: the cycle of washing, plus external cooling, life is single-sided 1.5-2 times.

    4, centrifugal pump friction pair selection hard to hard (YG6 / YG8, SiC / SiC, etc.), high viscosity, with a small amount of solid particles of the medium or crystallization of the media, have a good effect.

    Then we talk about the centrifugal pump cooling form.

    1, domestic centrifugal pump in the sealed chamber around the cooling water jacket set to cool the water, can seal the chamber temperature is reduced to 200-250 ℃.

    2, on the single-ended seal, the use of injection-type cleaning, from the outside lead clean, the temperature of about 100 ℃ wax oil (usually without diesel, because diesel is finished), both reduce the temperature and improve the working environment is effective Approach.

    3, gland outside the use of quench water; in addition to lower temperatures, but also to prevent clogging sewer.

Submersible pump repair and maintenance

Submersible pumps on a regular basis on the submersible pump and its control system for comprehensive maintenance, at least l times a year to do a comprehensive preventive maintenance, including:

    (1) when the vibration of the sound and voltage and current with or without abnormalities; stainless steel multi-level deep well submersible pump

    (2) start the device is working properly;

    (3) whether over-temperature water leakage alarm;

    (4) whether the multi-protection established by the measurement and control is frequent;

    (5) the main cable and control cables are aging and cracking;

    (6) whether the main contactor sticky oxidation or burr;

    (7) thermal relay settings are correct;

    (8) whether the winding insulation signs of aging;

    (9) Insulation resistance to ground is too low;

    (10) three-phase winding resistance is balanced;

    (11) the stator rotor to ask whether there are sweeping or scratches;

    (12) control system level gauge is accurate;

    (13) whether the upper and lower limit output is normal and reliable;

    (14) whether the float action is reliable;

    (15) whether the temperature detection components aging malfunction;

    (16) whether the oil emulsification;

    (17) mechanical seals are intact;

    (18) bearing with or without wear;

    (19) impeller wear or cavitation;

    (20) whether the shaft rust deformation or wear;

    (21) whether the motor inside and outside fastening screw loose;

    (22) cooling jacket and circulating water pipes in the presence of debris;

    (23) whether the pump and the surrounding sediment deposition or blockage.

    In the preventive maintenance and submersible pump operation process, should be correctly distinguish between over-temperature alarm, the alarm is really over-temperature or aging components of the malfunction. In the case of component aging, the signal will only access the alarm signal, not to directly participate in control, to reduce the frequent start of the submersible pump.

    Frequently Asked Questions in Maintenance Work Submersible pumps are immersed in water for long periods of use, causing the aging of the main cable skin to crack. Water penetrates the cable directly into the submersible pump. Therefore, it is necessary to inspect the cables regularly, Cracks, cleaning the surface of the cable after cleaning, waterproof tape can be used for waterproofing, but be careful to soak a few hours after the insulation check with a shake table to meet the requirements before put into operation. Replace the main cable with an insubstantial or non-repairable value. Because the main cable is a watertight connector with a dedicated cable, the replacement price is more expensive, so the process can be used to save costs of bonding.

    In the daily inspection, in addition to full operation control, test instruments, but also to display their subjective active role, as Chinese medicine practitioners to diagnose the disease "look, smell, ask, cut" as abnormal pump abnormalities. "Look" is to see, take a look at the instructions of various ministries pressure, flow, temperature, current, voltage is normal, the pump components have deformation, discoloration, change and whether the leak, with or without plugging; Smell, smell the unusual taste, liquid hydrocarbons, gasoline, benzene and other smells of leakage, equipment, paint, rubber and other insulation burnt paste paste taste; "ask" is to listen, listen to the voice of the rolling sector, with or without Abnormal sound, such as water hammer, friction sound, percussion, vortex sound, breaking sound, etc .; "cut" is to touch, touch whether overheating, vibration and so on. Only in this way the role of the operator, in a variety of test instruments, instruments of assistance, can the daily inspection well, early detection of anomalies, preventive measures.

How to reduce the energy consumption of submersible pumps?

How to reduce the energy consumption of submersible pumps?

We all know that in the summer is the peak of water, so the pump on a good maintenance of some, began to use, then in the course of how we like to reduce the energy consumption of wells with submersible pumps?

Here we will explain in detail for you some:

First, the pump surface and pressure water chamber (also known as volute) on the surface rust.

Surface corrosion bumps will reduce the pump water 7% -8%; maintenance only steel brush and iron sandpaper or grinding wheel smooth, you can make it in the work of fuel consumption or power consumption reduced by 9% -14%.

Second, the seal ring gap increases

According to the test when the impeller radius in the direction of the gap increased by 4 mm, the pump water will be reduced by 10%; maintenance only with organic adhesive plus asbestos back to the factory-defined gap, you can make the pump fuel consumption at work or electricity Consumption reduced by 10% -12%.

Third, the pressure chamber and impeller axis does not coincide

When the pressure chamber and the impeller axis deviation of 2 mm or more than 2 degrees, the pump water will be reduced by 5% -6%; maintenance only careful measurement, carefully identify the axis coincidence of the location of the installation of a solid, you can make the pump Reduced oil or power consumption by 6% to 7% during operation.

Pipeline pump manufacturers to talk about how to adjust the pipeline pump flow

When using the pipeline pump will encounter the need to adjust the flow of time, the following by our pipeline pump manufacturers in Shanghai Weihu pump for everyone to talk about what methods to adjust the pipeline pump flow.

 

    First, the speed adjustment

 

    When this method is used to regulate the flow rate, the required power can be reduced to a minimum, and an overheating in the flow regulation process can be eliminated. Steam turbines and internal combustion engines easily adapt to speed regulation at very little additional cost. A variety of mechanical, magnetic, hydraulic transmission and DC and AC variable speed motors can be used to adjust the speed. In general, variable speed motors are too expensive and can only be adjusted with adjustable blades only after economic studies have been done for special cases.

 

    Second, bypass regulation

 

    All or part of the flow may be diverted from the discharge line of the pipeline pump through the bypass line to the suction port of the pump or other appropriate point. The bypass can be equipped with one or more flow orifice plates and a suitable control valve. Metering bypass is usually used to reduce the boiler feed pump flow, mainly to prevent overheating. Substantial power savings can be achieved by bypassing the surplus flow of the propeller pump to replace the outlet throttling.

 

    Third, exports throttle

 

    This is one of the most common and inexpensive flow adjustment methods for low- and medium-specific speed pumps. Usually this method is also limited to low, medium speed than the number of pumps used. Partially closing any type of valve on the outlet line will increase the system head so that the system head curve will intersect the pipe pump head curve at a lower flow rate. The outlet throttling moves the operating point to a lower efficiency point and has a power loss at the throttle valve. This may be important for large-scale pump installations, and a higher investment adjustment method may be more economically attractive. Throttle to the dead point may cause fluid overheating in the pump, bypass can be used to maintain the necessary minimum flow, or a different adjustment means. This is very important for the pumps mentioned above for the treatment of hot or volatile liquids.

 

    Fourth, the intake throttling

 

    If there is sufficient NPSH available, then the suction line can be throttled by saving some power. Because the throttling of the outlet can cause the liquid to overheat or vaporize, the jet fuel pump often uses inlet throttling. At very low flow, the impeller of these pumps is only partially filled with liquid, so the input power and temperature rise is about throttle exhaust throttle full operation bit 1/30 condensate pump flow is usually used to control the depth of submergence 7, This is equivalent to the entrance throttling. Special designs can reduce the cavitation damage of these pumps to a negligible extent, but the energy levels also become quite low.

 

    Fifth, qi

 

    Air intake to the suction line of the pump is also a method of regulating the flow rate, this method can save some power compared with the output throttle. In general, it is not desirable to have air present in the delivered liquid and too much air always has the risk of the pump losing its priming head, so this method is rarely used in practice except in a few cases.

 

    If you want to buy pipeline pump can contact us  Weihu pump, our company is specialized in various types of pump manufacturing and computer control of water supply and drainage complete sets of equipment manufacturers to operate the pump-based products related to general motors, pumps and other related accessories.

Sewage pump should be how to go with the cable wires

When we use the sewage pump, sewage pump should be how to layout, also we need to pay attention to how to match the cable, the following is by Shanghai mine sewage pump manufacturer is simple to share with everyone, can be a reference for everyone.

First let's talk about sewage pump cable: when the installation of various types, will have the power and sewage pump machine distance is too long, need above the basis of the sewage pump accessory cable extension cable, so the size of all kinds of sewage pump power cable are decided according to the length of the cable.

Let's go ahead with sewage pump should be how to match the cable

First, to select the wiring sewage pump first according to the size of the cable to determine the length of the wiring, such as original pump configuration cable is 3 x10 cable with 100 square meters at this time should increase cable configuration 3 x16 square is appropriate. If use sewage pump itself power supply voltage is slightly lower than the voltage required sewage pump, and add the required length of cable configuration and longer, the operation of the sewage pump cable becomes larger, if the sewage pump working long hours for sewage pump motor is very bad, this kind of sewage pump under the condition of cable wiring should match YCW type or YC type rubber set soft cable, such as not cable advice to choose YCW dived into the water.

Second, if it is diving sewage pump have to according to the sewage pump conveying liquid medium to choose to match the line, such as transmission fluid is corrosive, so the outside of the cable rubber parts to choose stainless steel submersible pumps and corrosion submersible cable, or it will because the submersible cable corrosion and leakage of dangerous accidents.

Pipeline centrifugal pump in the use course of attention which points

When we use the pipeline centrifugal pump, how should we do it? Also need to pay attention to what the problem? The following by the weihu pump to share with you in the pipeline pump process we need to pay attention to those issues:

    First, pipeline centrifugal pump in the course of operation, the bearing temperature can not exceed the ambient temperature 3 ℃, high temperature shall not exceed 80 ℃.

    Second, unscrew the pipeline pump body of the water plug, irrigation diversion (or cited pulp).

    Third, start the pipeline centrifugal pump motor, when the normal operation of the pipeline pump, open the outlet pressure gauge and import vacuum pump, depending on the display of appropriate pressure, and gradually open the gate valve, and check the motor load.

    Fourth, to the pipeline centrifugal pump bearing body lubricating oil by adding bearings to observe the oil level should be at the center of the oil standard, the oil should be replaced or added.

    Fifth, close the centrifugal pump and pipeline centrifugal pump outlet pipe valve and outlet pressure gauge and import vacuum table. Jog the pipeline pump motor, see whether the motor steering is correct.

    Sixth, try to control the pipeline pump flow and head in the range indicated on the plate to ensure that the pipeline pump in the highest efficiency point of operation in order to obtain the greatest energy saving effect.

     Seventh, if there is abnormal sound pipe pump should immediately stop to check the cause.

    Eighth, the pipeline pump and pipeline from the main pump to stop using, first close the gate valve, pressure gauge, and then stop the motor.

    Ninth, check the pipeline pump and pipe and the junction with or without loosening. Turn the pipe pump by hand to see if the piping pump is flexible.

    Tenth, regularly check the pipeline pump sleeve wear, wear should be replaced after a large.

    Twelfth, pipeline centrifugal pump used in the winter season, after parking, the need to pump the lower part of the water plug screw open the media release the net to prevent cracking.

    Thirteenth, the pipeline pump long-term outage, need to open all the pipeline pump, dry water, the rotating parts and joints coated with grease installed, and properly preserved.

    Fourteenth, the pipeline pump in the first month of work, after 100 hours to replace the oil, after each 500 hours, oil change time.

Vertical pipeline pump use

ISG type pipeline centrifugal pump for conveying water and other physical and chemical properties similar to the use of water for industrial and urban water supply and drainage, high-rise building pressurized water, garden irrigation, fire booster and equipment, the use of temperature T: ≤80 ° C.

IRG (GRG) type hot water (high temperature) circulation pump is widely used in energy, metallurgy, chemical, textile, paper, hotel and other high-temperature hot water pressurized circulation and urban heating system circulation pump, IRG temperature T: ≤120 ° C, GRG Operating temperature T: ≤240 ° C.

IHG pipeline chemical pump for the transportation of non-solid particles, corrosive, viscosity similar to the liquid of water for petroleum, chemical, metallurgy, power, paper, food, pharmaceutical and synthetic fiber and other departments, the use of temperature T: 20 ° C to 120 ° C.

YG pipeline oil pump for the transportation of gasoline, diesel, kerosene and other petroleum products, the use of temperature T: -20 ° C-120 ° C.

Pipeline pump installation method

1, the equipment shaft radial runout should be ≤ 0.04 mm, the axial movement is not allowed to more than 0.1 mm;

2, the sealing parts of the device should be installed to keep clean, sealed parts should be cleaned, sealed face intact, to prevent impurities and dust into the sealing area;

3, in the installation process is strictly prohibited bumps, beating, so as not to pay the mechanical seal friction failure and seal failure;

4, when installed in contact with the sealing surface should be coated with a layer of clean mechanical oil, so that can be successfully installed;

5, the installation static ring gland, tighten the screws must be uniform force to ensure that the static ring face and the axis of the vertical line requirements;

6, after installation to promote moving ring by hand, can move the ring on the axis of flexible movement, and a certain flexibility;

7, after the installation of hand drive shaft, the shaft should be no light and heavy feeling;

8, the device must be filled with media before operation to prevent dry friction seal failure;

Analysis of Pipeline Pump Parts

1, the motor: the electrical energy into mechanical energy of the main components.

2, pump seat: the pump is the main body, play a role in supporting the fixed.

3, the impeller: the core part of the centrifugal pump, it is high speed, great output, the impeller blade plays a major role in the impeller assembly through static balance before the experiment. The inner and outer surfaces of the impeller are required to be smooth to reduce the friction loss of the water flow.

Classification of Impellers

Open impeller: for conveying the material containing a large number of suspended solids, the efficiency is low, the liquid pressure is not high.

Semi-closed impeller: suitable for conveying easy to precipitate or contain solid particles, fibers and other particles of suspended particles, the efficiency is low.

Closed impeller: suitable for conveying clean liquid without impurities, high efficiency.

4, the pump shaft: motor connected, it is the transmission of mechanical energy of the main components.

5, mechanical seal: to keep the slide and the formation of the relative slip to prevent leakage of the device.

Main point of use of pipeline pump

1, the test work: Check whether the loose connections; hand-drive coupling to make the rotor a few turns, to see whether the unit is flexible rotation, whether the sound and the severity of uneven feel to determine whether the pump foreign body or shaft Bending, sealing the installation is not correct, etc .; check the sealing cavity of the cleaning oil on the 20th whether the filling 1/2 cavity space; pump unit surface is clean; unit turned to no-load test.

2, manual start: Pump (first), slightly open the outlet valve, start the motor, the pressure rise and confirm the smooth operation of the pump group gradually open outlet valve to the working condition requirements.

3, operation check: pipeline pump in the normal operation of the frequency, should regularly check and record the pump group ammeter, voltmeter, import and export vacuum gauge, pressure gauges and flow meters and other instrument readings, unit vibration, noise, temperature Is normal, the shaft seal should not have obvious fuel oil leakage.

4, normal parking: Close the discharge valve, the pump light load, stop the motor.

Emergency stop status:

⑴ pump motor operating ammeter indicates abnormal (too large or become very small); pump system is not the normal sound.

⑵ vacuum pump inlet pressure gauge, outlet pressure gauge indicates abnormal pump vibration and issued a different sound, a serious decline in performance.

⑶ pump motor odor, shaft seal leakage at the aviation fuel, bearing temperature more than 75 degrees and so on.