What are the factors affecting the sewage treatment of industrial corrosion resistant self priming p

Some people say that I installed a foot valve at the inlet of the sewage lifting pump, and when it stops, the bottom valve will be closed, and the water in the pump will not run away. How is it possible for a sewage lift pump to be pumped without water?

In fact, it is a good idea to install a foot valve at the inlet, but it is overlooked. Because there are a lot of unspeakable and unclear debris in the wastewater tank, such as plastic bags, if they are wrapped in the bottom valve, the pump will not be able to pump water, which is not serious, if it runs for a long time, the water temperature in the pump will rise due to the friction of the mechanical shaft seal, so that it will vaporize. There are two consequences:

1.If the pipe is made of PVC, the high temperature will cause the pipe to deform. 2.

After the water in the pump is vaporized, the mechanical shaft seal wears out due to the lack of water cooling, which leads to leakage and causes accidents.

In another case, when the machine is stopped, if there is debris stuck in the ball of the bottom valve, the water in the sewage lift pump will leak quickly, but the worker who operates the pump does not know that when the machine is turned on, he will think that there is water in the pump, and when it is invented, basically the sewage lift pump has been hung up.

Therefore, we should not pin our hopes on the operator, but should consider how to simplify the operation error of the worker. That's what we're working towards! Because, people are the most difficult factor to control.

Plastic self-priming pumps are corrosion-resistant due to plastic materials, so they need to use engineering plastic self-priming pumps in industrial production processes for the transportation and dosing of acids such as hydrochloric acid, sulfuric acid, nitric acid, and lifting and transportation of acid-containing wastewater. So how should the self-priming pump be selected?

First of all, it is necessary to confirm several important factors that affect the selection of self-priming pumps: conveying medium, conveying temperature, self-priming height, flow, head, caliber, power, etc.

By conveying what medium and medium temperature, determine what pump to choose and what material to use. For example, 98% concentrated sulfuric acid behaves differently depending on the temperature. Below 30, it can be transported by an acid-alkali resistant self-priming pump made of PVDF material, and a fluorine-lined pump is required for more than 30 years.

Hypochlorous acid and hypochlorite ions have strong oxidation, so a pump made of PVDF is required (a magnetic pump is recommended for hypochlorite ion solution).

According to the requirements of the self-priming height to adopt different configurations, it is generally recommended that customers install a bottom valve filter screen at the water inlet to prevent sucking debris, prevent the backflow of liquid, and start again without adding water, etc., the self-priming height is about 5 meters, and the self-priming barrel needs to be installed. (Principle: The self-priming pump continuously pumps the liquid in the self-priming barrel, so that the pressure in the self-priming barrel continues to decrease, and the atmospheric pressure will press the liquid into the self-priming barrel through the inlet pipeline, so as to improve the self-priming capacity).

The flow head is the basic requirement of a pump, and the flow head required by the pump can be quickly selected according to the flow head performance curve chart. For example, the self-priming pump that needs a head of 20m and a flow rate of 20m h is needed to find the horizontal line of the corresponding 20m head on the flow head curve, and the point X of the vertical line corresponding to 20m h (334L min) is selected, and a line H next to it above is selected, and the corresponding pump model MA-50052 is selected (the principle of choosing large and not small is adopted).

If the diameter requirement is 40mm and there is no self-priming requirement, you can also choose the magnetic pump MNX-452 (50*40 caliber) or the chemical pump MC-40032 (40*40 caliber) according to the above method.

Acid and alkali resistant self-priming sewage pumps are used for sewage transportation, lifting, fiber leasing and dosing, etc., so they are widely used in medicine, chemical industry, bleaching and dyeing, electroplating, painting, vertical etching, circuit boards, electronics, leather, fine chemicals, sewage treatment, waste gas treatment and other fields.

Among them, the main application fields are: fine chemical wastewater treatment, photovoltaic wastewater treatment, printing and dyeing wastewater treatment, metal surface wastewater treatment, mechanical processing wastewater treatment, chemical wastewater treatment, pickling wastewater treatment and spraying wastewater treatment.

Long-term pressure holding, cavitation or evacuation in the pump body will cause damage to the tightness of the self-priming pump;

The actual output of the corrosion-resistant sewage self-priming pump is small, which leads to the accumulation of air in the pump body, which causes the vaporization phenomenon in the pump body and causes seal damage;

The conveyed liquid has the property of early pure corrosion, and the cluster annihilation causes corrosion, seepage and damage to the sealing ring;

The ambient temperature of the use changes too much will cause damage to the mechanical tightness of the self-priming pump.

Plastic self-priming pump is a commonly used chemical pump in industrial production, plastic self-priming pump has acid resistance, alkali resistance and anti-corrosion centrifugal pump, made of engineering plastic material, has a strong corrosion resistance function, has been widely used in the chemical industry.

Precautions for starting plastic self-priming pumps.

1) Before piping, make sure to peel off the diameter sticker.

2) Remove the outer fan of the motor and use your hand to check whether the outer fan will rotate gently.

3) During the piping work, the residual debris in the suction pipe will cause a fatal failure before the ruler flows into the pump, so please clean the suction tank or suction pipe.

4) Confirm the direction of rotation of the motor.

5) In the valve of the suction piping, please open it by all means.

6) The pump should be completely filled with water, and the irrigation is to use the spit side piping to force out the air, and when the air is not easy to overflow, the outer fan blades of the motor are rotated 3-4 times by hand.

7) When the plastic acid and alkali resistant self-priming pump is fully filled, after the discharge pressure rises instantaneously, the discharge valve is slowly opened, and the discharge pressure or amount is set.

Precautions in the operation of plastic acid-alkali resistant self-priming pumps.

1) Sound inspection: When air or solids are sucked in from the suction tube, abnormal sounds are emitted, and vibration increases, and when the pointer of the suction side pressure gauge changes, air is often mixed in.

2) Vibration check: Please pay attention in advance to whether it will cause idling phenomenon or vibration with poor installation, please adjust the discharge amount with the valve on the discharge side, and do not close the valve on the suction side (3) Others: Pay attention to the discharge pressure, suction pressure, flow rate, and current value, if these abnormal changes or falls, it may be that there is a solid object blocking on the suction side or inhaling air, etc.

Precautions when the plastic acid and alkali resistant self-priming pump is stopped.

1) Usually, after the pump discharge valve is fully closed, when it is stopped, the suction side is closed first, and it becomes cavitation corrosion, and there will be an accident of burnout.

2) When the intake state is running, close the suction valve after stopping.

3) When the power is stopped due to power failure during operation, cut the power switch first, and close the discharge valve by hand at the same time.

Precautions for long-term shutdown of plastic acid and alkali resistant self-priming pumps.

When stopping for a long time, the liquid in the pump should be cleaned, but if the liquid pumped in winter freezes, it will crack or destroy due to volume expansion, so please be careful.

Other precautions for plastic acid and alkali resistant self-priming pumps.

1) For the borrowed pump installed in the piping, please operate it from time to time and confirm that it can be used at any time.

2) When the pump is idling, the bearing of the pump may burn out and cause a fatal accident, and it must not be run dry at will.

4) Please use it in the specified discharge amount and head, and do not use it in very little or too large discharge volume.

Plastic acid-alkali resistant self-priming pumps convey liquids containing impurities.

1) In principle, it is not recommended to tell the pump to convey the liquid containing particles, because the service life of the pump will be reduced according to the number, size and hardness of the impurity particles.

2) It can be used for liquids with impurities, as long as it does not produce compounds.

Pellets are available at 500 mcron, with a 4% content.

Pellets can be used at 100 mcrons for 8% content.

Wastewater treatment self-priming Youxiang pump is mainly used in the lifting, conveying and circulation of industrial sewage, and the reason why it has a wide range of applications is mainly because of the following 4 points of early limb grinding:

The pump head and accessories are made of FRPP material, which has strong acid and alkali resistance and corrosion resistance;

The pump head is integrated injection molding, not easy to deform, not easy to leak, integrated self-priming cylinder design, strong self-suction;

The machine seal is made of silicon carbide Lushi material, with good sealing, and all sealing rings are made of fluorine rubber, which has good resistance to strong acids and alkalis;

Low energy consumption, high efficiency, more power saving; TECO Motor is adopted, which has low vibration, low noise, energy saving and environmental protection. The scroll runner design listens to the efficiency of the water pump, so that the supporting motor is smaller and more power-saving.

The self-priming height and cavitation allowance of the self-priming corrosion-resistant pump are two numerical parameters that reflect the self-priming ability of the self-priming pump from different angles.

The self-priming corrosion-resistant pump self-priming height refers to the self-priming corrosion-resistant pump at the standard atmospheric pressure when the water temperature is at room temperature, the self-priming corrosion-resistant pump can suck the self-priming height, the self-priming corrosion-resistant pump self-priming height is expressed in m, the current self-priming height is relatively high The product has a strong self-priming pump that can be idled without irrigation, and the pump self-priming height can reach 8-10 meters.

The NPSH of the self-priming corrosion-resistant pump refers to the surplus energy head of the liquid per unit mass that exceeds the saturated vapor pressure at the suction port of the self-priming pump, and the NPSH unit of the self-priming corrosion-resistant pump is also represented by m. (Plastic treasure 4000506393).

The relationship between the self-priming height of the self-priming corrosion-resistant pump and the NPSH is usually represented by the performance curve of the self-priming corrosion-resistant pump manufacturer. In the self-priming sample, in addition to the structure and size of the self-priming corrosion-resistant pump, the performance curve of the relationship between the flow, head, self-priming height and self-priming time of the self-priming corrosion-resistant pump is also provided, so that users can understand the parameter values of each series of self-priming corrosion-resistant pumps in detail when purchasing and selecting.