WEL Pump Industry congratulates the success of Belt and Road Forum

Translated by Joyce from WEL Pump Industry

At the beginning of summer in May, green grasses are growing and flowers are blooming. All creatures are living vigorously meanwhile to the real sense of prosperity.

The world has cast its eyes to China again.

This time it is extraordinary.

From 14 to 15 in May 2017, our national president Xi Jinping attended “Belt and road” Forum for International Cooperation. He hosted the round table summit meeting of leaders. With observation and deliberation on the status of world affairs and the fate of human beings, President Xi discussed the construction and cooperation about “Belt and Road” with each sides participating the meeting, drawing the favorite picture of the common fate of all human beings.

Leading the development of the world, China’s proposal inspired responses from all over the globe.

More than 2000 years ago, our ancestors started from scratch, got through prairies and deserts, finally developed the silk road on land that connects Asia, Europe and Africa. They sailed through horrifying waves in their long voltage, creating the silk road on sea that connects the east and the west.

On the morning of May 14, at the National Conference Center,

Belt and Road Forum for International Cooperation Opened up.

President Xi delivered a keynote speech that took human beings at heart, having the whole world in view, grandly including the present and the ancient times.

The conference hall capable of holding more than 1600 people is full with people.

The 40 minutes lecture received 27 times of warm applause on the site.

President Xi is highly praised by guests from each line of industry attending the meeting for his sophisticated deliberation, grand proposal and practical promotion that lead the construction of “Belt and Road” to develop broadly and bear worthwhile fruits.

The spirit of Belt and Road greatly inspires WEL Pump Industry. This largely boosts the morale of our staff members. We will make efforts to offer even better service to our clients all over the world.

How does Belt and Road Forum for International Cooperation influence WEL Pump Industry?

Translator: Joyce from WEL Pump Industry

Chinese source: Report by Xinhua News Agency on May 15 in Beijing.

Chinese National President Xi Jinping proposed in 2013 to build Belt Road Economic Zone and Silk Road on Sea in the 21st Century together.

Over the past three years, the construction of “Belt and Road” has progressed fluently and made plentiful achievements, widely welcomed and highly commented by international society.

From May 14 to May 15 in 2017, China hosted the Belt and Road Forum for International Cooperation in Beijing.

This is a grand international meeting where all parties get together to discuss and build the “Belt and Road”, to share the fruits of mutual beneficial cooperation. This is also an important platform for furthering international cooperation and connecting each other’s development strategy.

During the Forum and on its eve, governments of each country, regions and enterprises reached a series of agreement on cooperation, took crucial measurement and made practical achievements. The Chinese side has summarized some of the representative achievements and put them in order, forming a Forum Achievement List.

This list mainly covers policy communication, facility connection, fluent trade, funds circulation and interlinked popular feelings, which falls into 5 categories, 76 general types and more than 270 specific achievements.

1. Promote strategic connection, further policy communication

1) Chinese government has signed mutual“Belt and Road” cooperation and forgiveness memorandum with relative governments including Mongolia, Pakistan, Nepal, Croatia, Republic of Montenegro, Bosnia and Herzegovina, Albania, east timor, Malaysia, Singapore, Burma.

2) Chinese government has signed cooperation files with relevant international organizations including United Nations Development Program, United Nations Industrial Development Organization, United Nations Human Settlements Program, United Nations Children’s Funds, United Nations Population Fund, United Nations Conference on Trade and Development, World Health Organization, World Intellectual Property Organization, International Criminal Police Organization.

3) Chinese government signed memorandum of understanding about compiling Sino-Hungary Cooperative Schedule Outline together with Hungarian government, and signed intergovernmental bilateral cooperative plan about constructing “Belt and Road” with governments of Laos and Cambodia. (to be continued)

As a development private company, WEL Pump Industry will take this golden opportunity to develop our submersible pump and sewage pump markets overseas, to supply more high quality water pumps to people all over the world.

Assemble the coupling of water well pumps submersible

1. When dismantling the coupling of water well pumps submersible, it is not allowed to knock it directly with a hammer. You should put a cooper bar under the coupling firstly. And you should knock the wheel hub of the coupling instead of its external rim, as the rim is easy to break. 

The most ideal method is to use a specialized tool called Luzi.
Small or medium size water well pumps submersible have small magnitude of interference. Therefore, their couplings are easy to take down.
While the coupling and shaft of larger water well pumps submersible match with larger magnitude of interference. Hence, we must heat the coupling before dismantling it.

 2. When assembling the coupling, you should pay attention to the serial no. of the keys (in case of coupling with more than two keys).
If you hit the coupling with a cooper bar, you must pay attention to the position.
For example, hitting on the end surface of the shaft hole is easy to make it contract. That will make the shaft unable to get through. Hitting on the rim of coupling is easy to break the straightness of the end face. That will influence the accuracy when measuring the shaft with a feeler gauge in future.
For coupling with large magnitude of interference, you should heat it before assembly.

3. We must ensure the pins, screws, washers and rubber mats of the coupling are of uniform specifications and sizes, for fear of influencing the dynamic balance of the coupling.
We should mark the bolts of the coupling and the correspondent pin holes on the coupling to avoid mistake in assembly.

4. The coupling and the shaft usually adopt transition fit, which is both possible for a bit of interference fit and a bit of clearance. Loose transition fit are suitable for couplings with longer wheel hub. These couplings have longer shaft holes, and their surface are coarse from processing. Therefore, they will naturally produce a small amount of interference fit after assembly.
If the fit between couping and shaft is so loose as to influence the concentricity of shaft and hole, you should make up by welding it.
To punch dots on the shaft or add a cooper shell to it is nothing but a makeshift only. It is not an ideal solution.

Measuring the bend degree of the shaft of deep well submersible pumps

Shaft is a crucial part of deep well submersible pumps.

If the shaft bends, it will cause imbalance of the rotor and friction between the dynamic parts and the static parts. Therefore, the bend degree of the pump shaft should always be measured during overhaul.

1. Put the two ends of the shaft on the V shaped iron. The V shaped iron should stand stable and firmly.
2. Set up the dial indicator. Let the measuring rod point to the head of the shaft.

Then, turn the shaft of the deep well submersible pumps slowly. If the shaft is bent, the dial indicator will have a max reading and a minimum reading in every circle the shaft turns. The difference between the two readings show the bending degree of the shaft.

In conclusion, the process is actually measuring the radial run-out of the shaft, or flutter.

3. Half of the flutter is the bending value of the shaft.

The common request on radial run-out is that the middle part shall not run out more than 0.05 mm, while the two ends shall not run out more than 0.02 mm.

Another crucial part of the deep well submersible pumps is impeller.  Therefore, we will talk about the maintenance of impellers as follows:

1. Clean and check the surface of each stage of impeller. The impeller surface should not have such defects as cracks, wear, etc. The surface of the flow channel of the impeller should be smooth, with no lime scale or burr. The vanes shall not have such defects like cracks, being thin as a result of flushing.
2. Check the seal ring at the suction inlet and discharge outlet of each stage of impellers. The ring shall not be loose and its surface shall be smooth, with no burrs. The coarseness value of the surface shall not surpass 0.8μm. The assembly clearance between the ring and the impeller shall be 0.05~0.10 mm.

Check the radial run-out of the impellers basing on its internal diameter. The checked value shall not be larger than 0.05 mm

End surface run-out no larger than 0.04 mm.

3. The impellers and the shaft adopt interference fit, usually H 7/h 6.

The interference value between key and key slot is 0.09~0.12 mm. After assembly, the clearance at the top of the deep well submersible pumps key will be 0.04~0.07 mm.

4. The impeller should be statically balanced.

The 10 hp well submersible pumps always stop working after running for a while

1) Suction head too high

Troubleshooting method: Check the present net head. Pipeline at inlet too small or too long will cause great friction loss.

2) 10 hp well submersible pumps impeller or pipeline is clogged.

Troubleshooting method: check for obstacles.

3) The seal pad of the pump case is broken

Troubleshooting method: check the conditions of the seal pad and replace it as required.

3. The 10 hp well submersible pumps consume too much power

1) The pump rotates in a wrong direction.

Troubleshooting method: check the rotary direction.

2) The rotary parts get deadly stuck.

Troubleshooting method: check if the clearances of quick-wear parts inside the pump are normal.

3) Bend shaft

Troubleshooting method: correct the pump shaft or replace it as required.

4) Speed too high

Troubleshooting method: check the voltage of the motor windings or the turbine steam pressure.

5) Pump head is lower than the rated value.

Too much fluid is being pumped.

Troubleshooting method: consult the manufacturer.

Install a throttle, cut the impellers.

6) The fluid is heavier than the estimated weight.

Troubleshooting method: check the weight ratio and viscosity.

7) The stuffing box is not stuffed correctly, with insufficient stuff or stuff too tight, not put into the box in a correct way.

Troubleshooting method: check the stuff, refill the stuffing box.

8) The shaft bearing is not lubricated correctly or worn out.

Troubleshooting method: check and replace as required.

9) The clearance between the wear-resistant rings in operation is not correct.

Troubleshooting method: check if the clearance is correct.

Replace the pump case or wear-resistant ring as required.

10) The pump case bears too much pressure from the pipeline.

Troubleshooting method:

Eliminate the pressure and consult the manufacturer.

After eliminating the pressure, check the centering of the 10 hp well submersible pumps.

Discussion about trouble shooting of mechanical sealing in submersible well pumps

Mechanical seal is also called end face seal. With the force from spring and sealing medium, it adds an appropriate amount of pressure on the contact surface between the rotating dynamic ring and the static ring the make their end faces touch each other closely.

A very thin layer of oil film is kept between the end faces. The medium will confront large resistance force when it passes through, which prevent leakage of fluids, achieving the effects of sealing. Meanwhile, this thin film also lubricates the dynamic ring and static ring.

If adjusted well, leakage can be prevented completely.

1. Features of submersible well pumps’ mechanical seal

The main advantage of the mechanical seal of submersible well pumps is reliable sealing. It rarely leaks in a very long period of operation. Its service life is long, generally 5 years on average, which also suggests a long maintenance period.

But mechanical seal has complex structure. It is manufactured and installed with high precision. It needs the maintenance personnel to be highly skillful. As the mechanical seal on oil delivery pipe is built-in type, we often need to dismantle the oil pump when maintaining the mechanical seal, which takes a large amount of work.

Therefore, it is of great importance to ensure reliable operation of the mechanical seal, and prolong the service life of mechanical seal.

2. Common problems of mechanical seal of the submersible well pumps

During operation, the main possible problems of mechanical seal are excessive amount of leakage and excess temperature.

Touch the gland of the mechanical seal with hand. If you cannot keep your hand on it for a moment, it indicates excess temperature.

The amount of leakage should not be more than 60 drops per minute. If the drops are in a line, it signifies excessive amount of leakage. If the seal ejects oil outward, you should stop the submersible well pumps at once for inspection.

For more information, please contact info@welpump.com 

Check out the problems of deep water well pumps by observation

We can find out if the parts on the deep water well pumps are loose, if there is any crack on it, and if it is injured, etc. though observation. We can find out if the lubrication is normal, if there is dry friction, if it leaks air or oil, etc. We can judge the wearing conditions of relative accessories by observing the amount, size and features of metal granules in the deposit at the oil box. We can monitor the deep water well pumps to see if it runs normally, if any abnormal phenomenon happens. We can watch the various meters installed on the equipment reflecting the working conditions of the deep water well pumps to know about the change of data. We can check the product quality and make a judgment about the working conditions of the equipment through measurement tools or by directly observing its surface.

By making a comprehensive analysis on every piece of information, we can judge whether the well pumps have any problem, where are the problems, how serious they are and their causes.

Through instrument, we can observe the worn particles collected from the lubricating oil of the equipment. An easy way of monitoring the wearing conditions of the pump is magnetic plug method.

The principle of this method is to insert a magnetic plug into the lubricating oil to collect iron particles as a result of wearing. By observing their size, amount and shape features through a reading microscope or with naked eyes directly, we can judge the wearing conditions on the surface of the mechanical parts.

By the way of magnetic plug, we can detect large particles caused by wearing of the machinery parts in later period.

If you see a small amount of tiny worn particles during observation, it means the equipment is running normally. If you see large particles, you should begin to pay much attention to the operation conditions of the pump. If you see large particles many times successively, it is a sign of failure in near future. At this time, you should stop the deep water well pumps at once, find out the problem and solve it.

The above explanation is detailed enough. It needs a long term of accumulated experience to judge exactly using these detection methods.