Find out the problems of 3 inch deep well submersible pump by hearing

Some primary simple methods usually used in monitoring the conditions of 3 inch deep well submersible pump are listening, touching and observing.

In this article, we will introduce the listening method only. The rest two methods will be introduced later. When the equipment is running normally, it will send out a rhythmic sound.  As long as you have become familiar with and mastered these normal rhythms and beats, you can compare it with the abnormal noise that is heavier, mussy or weird by listening to the pump, and find out the hidden dangers inside it, for example if anywhere is loose, clicking or unbalanced. Beat the accessories with a hammer and listen for a cracking sound to judge if it has any cracks. Electronic echo meter is a kind of vibration acceleration sensor. It changes the vibration conditions of the equipment to electrical signal and magnifies the signal. The workers wear an earphone to monitor the vibration sounds of the running equipment so as to realize observation measurement of the sounds. We can judge if there is anything wrong with the 3 inch deep well submersible pump by measuring the signals of one point, in different period, at same rotation speed and working conditions and comparing them. When you hear a clear and sharp noise from the earphone, it indicates higher frequency of vibration. This is generally because smaller and stronger accessories have local defects or tiny cracks. When you hear a turbid and deep noise from your earphone, it indicates lower vibration frequency. This is generally because larger and less strong accessories have big cracks or defects. If the noise you hear from your earphone is stronger than usual, it indicates the problem is worsening. Louder noise indicates more severe problems. If the noise you hear is mussy, intermittent and has no rhythm, it indicates some accessories or parts are loose.

Why does 3 inch diameter submersible deep well pump rotate so slowly?

Analysis on the causes for 3 inch diameter submersible deep well pump not sending out water

Air exists in the inlet pipe and the pump body

1) The self-priming deep well pump is not filled with enough water before it starts. Sometimes it may seems like the pump is full enough with water as you see water spilling out from the air discharge hole. But you didn’t turn the pump shaft to exhaust all the air, leaving a small amount of air remaining in the inlet pipe or pump body. 
2) The horizontal section of the inlet pipe connecting with the pump should run downward on a 0.5% slope in the direction contrary to the flow of water. The inlet of the pipe connecting with the deep well pump should be at the highest point, not completely horizontal. If the inlet pipe cocks, there will be air remaining in it, which will bring down the vacuum degree in water pipe and deep well pump, impacting suction. 
3) The packing of single stage 3 inch diameter submersible deep well pump is worn out as a result of long term operation, or is too loose, leading to a large amount of water ejected out from the clearance between the packing and the pump shaft sheath. That will allow air to enter the pump through this clearance, impacting the lifting of water. 
4) As the inlet pipe is always submerged under water, its wall will be corroded and hole. After the 3 inch diameter submersible deep well pump has started working, the water surface will keep dropping. When the holes are above water surface, air will enter the inlet pipe through them. 
5) The bends of inlet pipe crack. Even tiny clearance at the connection between inlet pipe and water pump will be possible for air to enter the inlet pipe.

The 3 inch diameter pump rotates at low speed

1) Human causes Some clients will drive the pump with another motor when the original motor breaks down. That will cause such consequences as small flow quantity, low head and even failure of lifting water. 
2) Mechanical failures of the submersible pump itself The fasten screws on impellers and pump shaft become loose or the pump shaft is distorted and bent, causing displacement of the impellers or damage to shaft bearing. As a result, the impellers will rub against the pump body directly. All these are possible causes for the decrease of the rotation speed of the pump. 
3) The motor is not well repaired. The motor is demagnetized because its windings are born out. If the number of coils of windings, the diameter of the wire or the way of wire connection is changed during maintenance, or the problems are not totally solved, the rotation speed of the water pump will also change.

Analysis on centrifugal pump leakage

What should we do if our centrifugal pump leaks

1. Leakage during installation and static test 

If the leak is not serious, it is most probably caused by seal ring problems of dynamic ring or static ring, while serious leaks indicate problems between the friction pairs of the two rings. After primary observation on the amount of leakage and judgment on the point of leakage, you can turn the pump with hand and observe the change of leakage amount. If the leakage doesn’t change obviously, then the problem must be in static and dynamic ring, friction pairs and the seal ring of the dynamic ring. Maybe the seal ring of static ring has become ineffective. Besides, it is also possible for the existence of leakage channels.

2. Leakage during test run

After static test on the mechanical seal of a centrifugal pump, the centrifugal force generated when the pump runs at high speed will hinder the leakage of fluid. Therefore, despite of ineffective seal in shaft and end cap, most leakage are caused by the damages to the friction pairs of dynamic ring and static ring. In most cases, you need to dismantle the friction pairs, change for a new one and reassemble it. 

3. Sudden leakage in normal operation 

If a centrifugal pump leaks suddenly during operation, it is most probably caused by tremendous change of working conditions or inappropriate operation or maintenance.  If the pump is exhausted, or holds pressure for rather a long time, or suffers from cavitation, the seal will be broken. If the practical output of the pump decreases, it will leave a large amount of fluids circulating inside the pump with heat accumulated simultaneously. That will vaporize the fluids and lead the seal to lose efficiency. If the pump has been idle for a long time, and you didn’t turn it with hand before starting it, the friction pair will be adhesive and tear the the surface of seal. If the medium begins to contain more corrosive, polymerism and gummy materials, or the environmental temperature changes sharply, the seal will also break. 

Faced with all the above kinds of leakage, we should find out a solution respectively, either change the seal or repair it. We should not mend it casually so as to make the centrifugal pump barely work for a longer time, and overhaul it until a more serious problem occurs.

Leak again?

Still leaking?

Come on,

Change for a shield pump, a magnetic pump for good.

Nine steps to select a sewage lift pump

We may often wonder how do people deal with and drain wastewater, such as rain water, dirty water generated in construction site and water having been used in bathing? WEL Pump Industry tells you that the treatment and drainage of sewage water needs a professional equipment, i.e. Sewage lift pump.

How could we find out which sewage lift pump is better, and how should choose from the brands of sewage lift pumps?

Now the WEL Pump industry will show you how to judge the quality of sewage lift pumps though nine of its performances.

Number 1, flow quantity

This refers to the amount of water discharged by a sewage lift pump in an hour. You can choose according to your own practical conditions.

Number 2, pump head

This refers to the maximum height the pump can lift the sewage water to. If you live on the first floor, you house may be 3m to 5m high. Considering about pipe loss, you need only 5m~8m head. But you should also make sure the flow quantity is enough too. Therefore, when selecting an integrated sewage lift pump, you should note the changing curve of flow quantity and head.

Number 3, diameter of flow-passing part

This indicates the maximum diameter of particles that can pass through the discharge pipes.

Number 4, protection level

The protection level for some parts of small sewage lift pump is IP44. Higher level stands for safer pump.

Number 5, case material

The case for sewage lift pump is generally PP/PE/ABS.

Number 6, heat dissipation

When the sewage lift pump is running, especially at high speed, its temperature will also be very high. In this case, heat dissipation will become an important index for measuring its performance.

Number 7, start control

That is to say under what condition is the sewage lift pump started, how is it controlled.

Small sewage pumps had better be pneumatic. Pneumatically controlled sewage pump will not get its floating ball winded and will not fail to start up. This is a fairly exact way of control.

Number 8, service life

Of course longer service life is better, since it can avoid the troubles of changing and maintaining. In order to save money, some clients will buy a cheap sewage pump produced in a small scale factory. At last, a few years later, the cost for maintenance and changing will surpass the cost for purchasing a more stable and safer sewage pump.

Number 9, the difficulty level in maintenance

Sewage pumps would go wrong. It will be a difficult task to dismantle and maintain the pump. The internal surface of the pump case will be dirty after some time of operation.

How to select 12 hp deep well submersible pumps?

12 hp deep well submersible pumps are a kind of vertical multistage centrifugal pump. It gets water out of deep wells.

With the underground water level dropping, deep well pumps are more widely used than common centrifugal pumps.

However, some clients didn’t choose a correct model of pump. As a result, either the pump doesn’t fit in with the well, or it can not send out water or send out enough water. Even the well may be damaged.

So how should a client select a deep well pump correctly?

1. We should choose submersible multistage pump according to the allowed maximum yield of the well of water source.

The practical flow quantity must be in line with the actual yield of the water well. It must be equal to or a little smaller than the actual yield. Otherwise, forced pumping will be inevitable, which will not only shorten the service life of the deep well submersible pump, but also, in worse condition, damage the filter screen, causing unstoppable flowing of sands, or even ruin the water well.

2. The diameter of 12 hp deep well submersible pumps must be in line with the diameter of the well.

To make it easy to hoist up and put down the deep well pump, to make the underground water accumulate quickly if any space is available with no resistance, and to reduce of the pump in operation, the well diameter from lifting pipe to pump body should be larger than the maximum diameter of the pump by 20~40mm. That is, the part of the pump with the largest diameter should have a 10~20mm annular clearance to the wall of the well. In this way, the service life of both the well and the deep well pump can be prolonged.

3. When you put the pump down into the well, never put the pump head at the position of the filter pipe, but at the position of the well wall pipe. Otherwise, when the pump works, it will cause unstoppable flowing of sands or damage the well.

We should decide the shaft forming structure of the well (well diameter, pipes positions), the depth of the well and the model of water pump according to the well logging curves of the manhole and the hydro-geological conditions of the well in question and adjacent water wells (including the depth, thickness and litho logy of the water source) and the operation conditions of the water pump, so as to avoid any possible problems in future when putting down the 12 hp deep well submersible pumps or the pump is running.

Contact: info@welpump.com

NPC and CPPCC sessions 2017 influence the development of WEL Pump

As one of the private enterprises in China, WEL Pump is positively influenced by the two sessions.

NPC and CPPCC Sessions 2017 refer to the 5th session of the 12th National Committee of Chinese People’s Political Consultative Conference and the 5th sessions of the 12th National People’s Congress of the People’s Republic of China. They opened respectively at 15 o’clock on March 3, 2017 and 9 o’clock on March 5, 2017 in Beijing.

The 5th session of the 12th National Committee of Chinese People’s Political Consultative Conference closed at 9:30 on March 13, 2017.

This session has passed personnel matters, passed resolutions from the 5th session of the 12th national committee of the Chinese People’s Political Consultative Conference about the standing committee’s working report, passed the report from the proposals committee of the 12th national committee of CPPCC about motions examination conditions in the 5th session, and passed political resolutions of this session.

The 5th session of the 12th National Committee of Chinese People’s Political Consultative Conference closed at 9:30 on March 15, 2017 in the Great Hall of the People.

Six draft resolutions about the government work report, about the executive conditions of national economy and social development plans in 2016, about the executive conditions of central and local budget in 2016 and the central and local budget in 2017, about the work report of standing committee of the national people’s congress, about the work report of the supreme people’s court, about the work report of the supreme people’s procuratorate, have been voted through. The draft of general provisions of civil law of the People’s Republic of China is voted on.

People’s Congress

1.  Listen to and deliberate on the state council premier Li Keqiang’s report about government work.

2. Examine and approve the state council’s report about the executive conditions of national economy and social development plans in 2016 and the draft plan for national economy and social development in 2017.

The rising of private economies promotes the development of Chinese economy. WEL Pump will make its contribution to the development of private economies.

WEL Pump congratulates China aircraft carrier on its first step into water

WEL Pump hereby congratulates our national aircraft carrier on its first step into water.

It is reported that on April 26, the diving ceremony of the second aircraft carrier manufactured in China is held in the morning at Dalian Shipyard belonging to China Shipbuilding Industry Group. Fan Changlong, the member of the political bureau of China Communist Party’s Central Committee as well as the vice president of Central Military Committee attended the ceremony and made a speech.

At about 9 am, the ceremony began with the magnificent national anthem. Following international conventions, bottle-throwing rite is carried out after ribbon-cutting. On the smash of a bottle of champagne at the head of the aircraft carrier, gorgeous strips of colors are ejected from the two sides of the carrier, along with the ringing sirens sent out from all ships around. Attendees on site applauded warmly. The aircraft carrier is slowly pulled out of the dock and wharfed.

The second aircraft carrier is developed and manufactured by our country independently.The building of this carrier is started in November, 2013. In March 2015, it started to be built inside the dock.   By far, the main ship body of the aircraft carrier has been completely built up. The equipment of main systems such as power system and electric system have been installed properly. Getting out of dock and entering water is an important point of the construction of aircraft carrier, marking the staged achievement of aircraft carriers designed and built independently by our country. Next, as planned, this aircraft carrier will take system equipment debugging and fitting-out construction, followed by a full range of mooring test.

Leaders from the navy and China Shipbuilding Industry Group, Shen Jinlong, Miao Hua and Hu Wenming as well as leaders, researchers, staffs from relevant navy and local departments and representatives of officials and soliders who have took part in the construction all attended this ceremony.

WEL Pump would like to express our sincere congratulations to the success of the second aircraft.