FAQ

We need to understand the operating condition in the consideration for pump selecting in previously introduced. After understanding the basic concepts, it is necessary to explain how to read the "pump performance curve (H-Q curve)". The performance of each pump model is different, and the most suitable pump must be selected according to the pump performance specifications and the operating conditions provided by the customer.

In the performance curve diagram, the horizontal axis is the CAPACITY (Q), the left side of the vertical axis is the HEAD (H), and the right side of the vertical axis is the EFFICIENCY (%) and shaft power.

The first gray straight dotted line is the shaft power curve under the maximum diameter of the impeller, the second gray straight dotted line is the shaft power curve under the minimum diameter of the impeller, and the red straight line(POWER) is the pump shaft power performance curve that meets the operating requirements provided by the customer.

The first gray dotted curve in the figure is the performance curve under the maximum diameter of the impeller, the second gray dotted curve is the performance curve under the minimum diameter of the impeller, and the red curve(TDH) is the performance curve that meets the customer's operating requirements of the pump, we call duty point, which is what we get by adjusting the size of the impeller, showing the relationship between capacity and head. The green curve(EFF) is the operating efficiency of the pump.

According to the flow demand of the horizontal axis, you can find the duty point by comparing the red curve upwards. By comparing the duty point to the left and right vertical axis, we can know the head and efficiency; then comparing the red line upwards, from the intersection (shaft power) to the right vertical axis, we can know how much the power is under this operating condition.

The efficiency of the pump depends on the duty point, and the change of the duty point will also have a great impact on the field process, so the correct selection of the pump is very important.

If basic preventive maintenance measures are taken, the sealless magnetic drive pump does not often fail. However, in order to have better pump quality and operating efficiency, there are several basic concepts which we need to know. The following describes the main problems that may be encountered when using a pump.

When the flow rate is insufficient or the liquid is not filled with the pump, dry running will occur. If the pump run dry, its internal components (such as impellers, bearings, etc.) will be rubbed, resulting in a lot of frictional mechanical heating and pressure, which will cause the magnet to demagnetize and then damage the pump.

2. Motor Overload

Motor overload occurs when a motor is under excessive load. The primary symptoms that accompany a motor overload are excessive current draw. The main reasons for the excess current are the increased load at the outlet of the pipeline, high lift, poor heat dissipation, blockage of the pipeline, wrong selection of the motor or pump, etc. At this time, the operating power will increase. During a long-time operation insufficient torque and overheating, the motor may cause burn out. 

3.Cavitation 
During the operation of the pump, if the pressure of the pumped liquid drops to the vaporization pressure of the liquid at the current temperature due to the large resistance of the inlet pipeline and the large gas phase of the conveying medium in the local area of ​​ the overcurrent part (commonly found in the impeller), the liquid begins to vaporize to form bubbles. After the bubbles enter the impeller with the liquid, the surrounding high pressure causes the bubbles to shrink sharply and even burst.

At the same time when the bubbles are condensed and broken, the liquid particles fill the cavities at a high speed, which produces a strong water hammer at this moment, and hits the metal surface with a very high impact frequency.
Cavitation is the most harmful to the pump. When cavitation occurs, the pump vibrates violently and makes noise, which will cause damage to the pump bearing, rotor or impeller.

4. Decoupling
As the temperature increases, the strength of the magnetic is weakened or the viscosity of the fluid is too high, the transmittable torque is less than the required torque, and if it continues to operate without cooling or sufficient torque, there will be demagnetization problems, which will cause the magnet to demagnetize and then damage the pump, resulting in failure.

In order to avoid these problems, the dry run protector is used to monitor the current or power of the pump motor when it is running. When the current is too high or too low, an immediate warning or automatic shutdown will be issued, which greatly reduces the probability of pump failure and maintenance costs.


Best Solution For Chemical Transfer – PTCXPUMP Sealless Magnetic Drive Pump

In the selection process of the pumps, the following factors should be considered to select the appropriate pump.

1. First of all, it is necessary to confirm the source of the fluid:

Such as the underground storage tank or the above-ground storage tank, how far the tank is located, the pipeline configuration and other conditions. It is recommended to install the pump as close as possible to the source of the fluid, and the suction pipe should be as short as possible, and also reduce bending or other fittings to reduce the pipe friction loss, which is the resistance of the fluid passing through the pipe.

2. Capacity(Q):

This is an important indicator, which refers to the amount of liquid passing through the pump per unit time, in m³/h, L/min, L/sec. The amount of flow will affect the size of the pump and the thickness of the piping. If the pipe diameter is too small, it will cause extra friction loss and noise problems.

3. Total head(H):

It refers to how high the pump can move the liquid, that is, the vertical height from the source surface of the fluid to the final outlet.

H = Total Head (in meters)= Discharge Head + Suction Head

The height of the head depends on the density of the conveyed liquid, the diameter of the impeller and what type of stage of the impeller.

4. Properties of fluid:

Chemical corrosive, temperature, viscosity, concentration(%), specific gravity and impurities are also the key point of choosing a pump.

◆ Chemical corrosive: According to the difference of the pH value of the fluid and its corrosive, the applicable pump material is also different.

◆ Temperature: When treating water, the temperature has a great influence on the suction capability; other liquids will vaporize at a certain temperature; oil and fats will significantly change their viscosity due to the temperature; The expansion of the material must be taken into account when the heat medium is in a high temperature state; and the chemical fluid will also change its corrosive with the difference of the temperature.

◆ Viscosity, Concentration, Specific Gravity: When the viscosity and concentration of the liquid change, it will affect the corrosive to metals and other materials, and the specific gravity will change accordingly. Therefore, the pump performance will also change.

◆ Impurities: The sand contained in the muddy water and the crystals in the chemical liquid. According to their hardness and content to select the structure of pump, and wear-resistant materials must be used at the same time.



Best Solution For Chemical Transfer – PTCXPUMP Sealless Magnetic Drive Pump

A sealless magnetic drive pump is a conventional centrifugal pumps and sealless magnetic drive pump working principle, the inner magnet and outer magnet are attracted to each other, the outer magnet is connected with motor shaft, and inner magnet is assembly with impeller, as the motor shaft rotates the magnetic attraction forces inner magnet to rotate, thus rotating the impeller and causing chemical liquid to be pumped.
A sealless magnetic drive pump is a conventional centrifugal pump of which design concept is to not use of any mechanical shaft seal. Compared with traditional mechanical shaft seal type of pump, sealless design does not have any leak problem and it is commonly used to transfer hazardous, flammable, explosive, strong acid, strong alkali, or toxic chemical liquid.

Sealless Magnetic Drive Pumps
The sealless design structure is to use rear casing to completely seal the inner magnet, impeller and other wetted parts in the fluid chamber. Outer magnet transmits by motor shaft and inner magnet is connected to the impeller which rotates by magnetic traction and transfer fluid through the pump. Due to the isolation of the fluid by a rear casing, it creates a sealless containment. The sealless design brings leak feature.

Mechanical Seal Pump
A mechanical seal pump uses a driven motor to directly rotate the impeller and transfer fluid. The difference of a mechanical seal pump is that a motor shaft goes through rear casing and requires a mechanical seal to prevent any leak. Mechanical seals are consumables and maintenance or replacement is required for long-term use. Fluids often leak through the seal position and cause danger in a mechanical seal pump.

When the pump is running, mechanical heat will be generated due to the rotating parts. A sealless pump uses its own operating fluid to dissipate heat and lubricate the rotating parts. When no fluid enters the pump chamber, the internal temperature will rise and the pump dry runs for a long time, it might cause magnet demagnetization to damage parts.

1. Use screwdriver to rotate the motor’s fan to ensure it is not too tight or stuck.
2. Check the motor’s power rating including frequency, voltage and wiring.
3. Clean piping system and supply tank.
4. Recheck to make sure all the screw parts (flange, pump casing, baseplate, etc.) are securely fastened.
5. Fill the pump with liquid to remove any air within the pump and suction piping.
6. Check and make sure all the inlet calve of system is open.
7. Make sure before start up the pump, and exhaust the inlet piping system and pump internal air.

How temperature affects pump selection
Do you know that temperature is a key factor in pump selection? It includes the temperature of the process medium and the environment of installation. Understanding these will ensure that you choose the right pump structure and material, and the most important thing is to select the right pump.

Temperature
Temperature refers to the heat present in a gas, liquid or solid. In the selection of the pump, we need to consider both the atmospheric temperature and the temperature of the pumping medium.

Temperature and pressure
Temperature not only affects the stability and efficiency of operation, but also affects the pressure of the pump delivery system. When the temperature of the gas approaches zero, it becomes a liquid, and as the temperature continues to increase, the pressure of the gas also increases. Different media generate pressure in different ways, before we design a system for pumping and conveying media, must be considered the connection between temperature change and pressure, If this is not considered, and the pump selector is not aware of how gasses will respond to temperatures within the system, faults can occur costing the business time, money, and production.

Zero degree environment
When the pump is installed or moved outdoors and the temperature drops overnight, the fluid medium inside the pump may freeze or solidify. When the pump is restarted, parts may be damaged. When selecting pump, we need considered the install environment, heating jackets may be required to maintain a consistent temperature within the pump or insulation. Consistent to avoid freezing or solidification of the fluid medium.

How temperature affects your pump
The material of pump selection, corrosion can occur depending on the temperature, high temperature liquid has more corrosive action against the material than those at lower temperature liquid. Therefore, is important to check the chemical compatibility of material at the temperature be for selecting a pump.

Pump Component Selection
As the temperature of the liquid medium increases, heat will be transferred to the entire pump system, including the internal shaft, bearings or bearings on the motor. Long-term operation may lead to shortened service life; therefore, the selection of parts also needs to consider temperature resistance level.

Changes in fluid viscosity
Temperature will affect the viscosity change of the liquid medium during the pumping process, for example, honey when heated becomes runny, therefore, it is necessary to understand how temperature change's liquid medium viscosity during pumping, and ensure that the correct pump is selected.

Part expansion and contraction
Under high temperature or low temperature, the parts will expand or contract at different speeds. When selecting the pump, it is also necessary to consider the use of high temperature or low temperature resistant parts to ensure the stability of the pump during operation.

Keep the heat ot maintaining low temperature
Under certain operating application conditions, the medium needs to maintain a certain temperature to keep the medium flowing. The system design can consider using a jacket type pump to achieve this, or use proper insulation to maintain a low temperature.

NPSH net positive suction head (NPSH)
When designing the pumping system, the temperature and vapor pressure of the fluid need to be considered to ensure that the pump has the correct NPSHa.

In order to meet the needs of different conditions of the human body, there are countless types of medicines now. Since the outbreak of Covid-19 in recent years, the pharmaceutical industry has developed rapidly. However, since medicines are used on the human body, safety and non-pollution are the primary conditions in the manufacturing process.
In order to ensure that the medicines can meet the legal and hygienic standards during and after the production, the types and materials of the pumps used in the production process are very important.

Application of the Cosmetics Industry and Pharmaceutical Industry

In a society where both women and men pursue beauty, cosmetics have apparently become one of the necessities for grooming themselves. In the production of cosmetics, to reduce the number of organics and microorganisms and minimize the concentration of bacteria, "deionized water" must be used in the cleaning process of the cosmetics process, and the sealless magnetic drive pump has leakage-free characteristics and is suitable for transportation DI water to ensure cosmetic hygiene and safety.

In pharmaceutical production, the materials of the pump must be carefully selected. If the material is cut corners or the material is not selected correctly, the product may not meet the standard, and the huge loss caused by this deficiency may also be borne.

In order to avoid serious accidents, sealless magnetic drive pumps can be used in equipment such as chemical dispensers, which can effectively keep medicines sterile and pure, and also take into account safety and efficiency in the process.

The wastewater treatment in pharmaceutical factories cannot be ignored either. Since pharmaceutical wastewater has a high salt content and may contain toxic substances, it is necessary to pay attention to corrosion resistance in the selection of equipment for treating pharmaceutical wastewater.

What Is the Best Pump Material for Handling Medical Devices?

Because the process of pumping medical chemicals must be as error-free as possible, reliable medical equipment materials are key, and polypropylene (PP) is an ideal material. Polypropylene is a plastic material resistant to acid, alkali and high temperature, and has good chemical stability, so it can also provide safe use in medical devices. We recommend the PTCXPUMP sealless magnetic drive pump – polypropylene for the impeller, front casing, rear casing and baseplate, or other durable materials such as plastics for O-rings, shafts and thrust rings, fine ceramics or SiC.

PTCXPUMP Sealless Magnetic Drive Pump That Can Be Safely Applied

PTCXPUMP sealless magnetic drive pump is used in the pharmaceutical and medical industry to provide you with the best solution to transfer fluid. The design without mechanical seal, which is different from traditional mechanical seal pumps, can effectively avoid leakage, and the material is GFR-PP and CFR-ETFE, which has excellent corrosion resistance and is suitable for transporting highly corrosive liquid such as hydrochloric acid, sulfuric acid, hydrofluoric acid and acetic acid or flammable and explosive fluids.

In the PTCXPUMP sealless magnetic drive pump series, PTC-100 ~ PTC-251 is for small applications, and PTC-400 ~ PTC-675 is for medium and large applications. There are various models to meet your various operating needs. PTCXPUMP is committed to becoming your preferred choice for resting assured to use pumps.
Contact us and our professional team will work with you to select the best pump for your waste gas treatment application.  

If your industrial or home equipment contains a pump, or you have a plan to use a pump, these 10 tips to save energy are something you need to know!

The application of the pump is all-encompassing. It is a widely used mechanical device. Since it needs to be used with a motor, the energy consumed during operation cannot be underestimated. Therefore, it is necessary to protect the pump and protect nature through energy conservation. Today's factories are mostly seeking to improve industrial energy efficiency and productivity. In addition to adopting equipment that meets national energy saving standards, the following describes what other energy saving solutions can be adopted, as well as related suggestions.

For more information on energy issues: Application of Hydrogen Energy and Applicable Pumps

1. Choose the Right Pump

The operating conditions are the main basis for pump selection. On the safe side, the safety factors will be kept when selecting the pump, in case the condition exceeds the initially provided conditions when operating (such as the flow becomes larger), causing the shaft power to exceed the rated power. If the pump is oversizing, it will not be able to reach best efficiency point, resulting in unnecessary energy waste and maintenance costs. The site operating conditions must be considered and the best efficiency point of the pump performance curve must be considered to correctly select the optimal pump that meets the needs of the application.

How to read pump performance curve and duty point: Reading and understand the Pump Performance Curve

2. Implement Variable Speed Drives (VSDs)

The variable speed drives can be installed on the motor, or the pump can be controlled by a built-in variable speed drive. The variable speed drive can adjust the head and flow rate by varying the rotational speed of the motor, which can meet the changing system requirements. From the formula below, it can be known that the reduction of the speed can save the power consumption of the power of third, improve the efficiency, and also help to prolong the service life. However, the head will drop accordingly, so attention should be paid to whether there is a problem that the pump cannot pump the liquid.

3. Use high-Efficiency Pumps

Use high-efficiency pumps as much as possible, and select the correct pump model according to the fluid characteristics, application area, flow rate, and power requirements, and use it with a high-efficiency motor. This method can achieve the greatest energy-saving effect.

4. Parallel Pumping Systems

For systems with different load requirements, adjusting the pump configuration is a good alternative to VFD. Multiple pumps or large and small pumps are connected in parallel to operate with proper staging as a system, mainly one (larger) main pump is responsible for most of the delivery, when there is more flow demand, or sudden damage, it can start other (smaller) pumps to support, reduce the burden on the main pump. Paralleling pumps helps to control the flow rate, adjust the flow rate, and keep the head constant, so the efficiency can be effectively improved. Basically, the energy efficiency of each pump needs to be determined to make the combination that can produce high efficiency.

5. Trim the Impeller

Cutting the impeller is also one of the ways to save energy for the pump, of course it must not be smaller than the impeller diameter range on the pump performance curve. The impeller becomes smaller, the peripheral speed of the impeller is reduced, the energy transferred to the fluid is reduced, the flow rate, pressure, and head are reduced, so as to reduce energy consumption and improve energy efficiency. However, there may be a risk of too much cutting and insufficient head. It is necessary to know the customer's operating conditions and then trim the impeller into an appropriate size.

6. Minimize System Pressure Drop

Reducing the power loss caused by pipeline pressure or accessories can reduce the power required by the pump to overcome the pipeline loss, so it is also an energy-saving way. Factors such as pipe size, length, flow rate, surface roughness, material and fluid characteristics will affect the pressure drop of the system, so the number of bends, expansions and contractions in the pipework should be minimized during design. In pump selection, it is also necessary to know the reasonableness flow rate needs to be matched with a reasonable pipe diameter.

7. Implement Control Valves Effectively

Control valves are used to control flow or pressure. Valves prevent energy loss through throttling and bypass flow, and can keep flow as its optimal level without wasting energy. Selecting the correct pump control valve according to the piping system can greatly reduce head loss and achieve energy saving.

8. Choose the Proper Pump Seals

Sealing systems including static and dynamic seals affect efficiency. Leakage of static and dynamic seals not only wastes fluid and pollutes the environment, but also reduces pump volumetric efficiency. In many applications, the energy savings from a high-efficiency seal system can be more significant than using a variable frequency drive, trimming the impeller, or resizing the pump.

9. Eliminate Unnecessary Use

Shut down unnecessary pumps at the right time, this is the simplest method, but it is also easily overlooked. Pressure switches can be used to control the number of pumps in use as the flow rate requirement changes.

10. Maintain the Pumps Regularly

Regular maintenance work and efficiency testing can ensure that the pump is kept in the best operating area during operation, and if there are problems with parts, they can be detected and replaced early, and the possibility of these problems causing failure or efficiency decline can be reduced. In addition, since a pump that has not been properly maintained for many years, its operating efficiency may be worse than it was purchased, so regular maintenance is also a necessary link.

After understanding the above top ten pump energy-saving tips, we should take appropriate measures according to the relevant standards of pump efficiency in various countries and the operating environment, and work together to save energy and electricity, and also to ensure the safety of equipment.

PTCXPUMP Sealless Magnetic Drive Pumps Can Be Safely Applied

PTCXPUMP sealless magnetic drive pump is used in lots of industries to provide you with the best solution to transfer fluid. Compared with traditional mechanical shaft seal pumps, the sealless design can effectively avoid leakage and avoid the problem of fluid waste, which is also helpful for improving efficiency. In addition, the material is GFR-PP and CFR-ETFE, which has excellent corrosion resistance and is suitable for transporting highly corrosive liquid such as hydrochloric acid, sulfuric acid, hydrofluoric acid and acetic acid or flammable and explosive fluids.

In the PTCXPUMP sealless magnetic drive pump series, PTC-100 ~ PTC-251 are for small applications, and PTC-400 ~ PTC-675 are for medium and large applications. There are various models to meet your various operating needs.
PTCXPUMP is committed to becoming your preferred choice for resting assured to use pumps.
Contact us and our professional team will work with you. According to the actual operating conditions, to select the best pump for you. By choosing the correct type of pump to achieve high efficiency and energy saving.