What are the selection principles of stainless steel centrifugal pumps?

It is necessary to know the flow rate, head, specific gravity of the medium (to determine the motor power), whether it contains solid particles (to determine the form of the machine seal).

Stainless steel centrifugal pump is a general fluid machine widely used in chemical industry systems. It has many advantages such as wide performance adaptability (including flow, pressure head and adaptability to the properties of the conveying medium), small size, simple structure, easy operation and low operating cost.

The flow regulation methods of centrifugal pumps mainly include control valve control, variable speed control, and parallel and series adjustment of pumps. Due to the different principles of various adjustment methods, in addition to having their own advantages and disadvantages, the energy loss caused by them is not the same, in order to seek the best, the least energy consumption, the most energy-saving flow regulation mode, we must fully understand the relationship between the flow regulation mode and energy consumption of the centrifugal pump.

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Generally, the flow rate and pressure head of the selected centrifugal pump may be inconsistent with the requirements in the pipeline, or due to changes in production tasks and process requirements, the flow rate of the pump is required to be adjusted, which is essentially to change the working point of the centrifugal pump. The working point of the stainless steel centrifugal pump is determined by the characteristic curve of the pump and the characteristic curve of the pipeline system, so changing the characteristic curve of either one can achieve the purpose of flow regulation.

Flow rate used, head requirements.

The acidity and salinity of the medium, whether there are any grains.

Regarding the selection of centrifugal pumps, () is correct.

a.The applied head is calculated according to the maximum possible flow rate.

b.The shaft power is recalculated based on the density of the liquid to be conveyed.

c.The head and flow rate of the centrifugal pump should be greater than the maximum flow rate required by the conveying task and the corresponding external pressure head.

d.The type of centrifugal pump should be determined according to the nature of the liquid to be conveyed and the task to be conveyed.

Correct answer: ABCD

When using stainless steel centrifugal pumps, you need to pay attention to the following issues:

Installation location: The stainless steel centrifugal pump should be installed on a stable ground or base to avoid vibration and noise caused by an unstable foundation.

Operating environment: The stainless steel Zen centrifugal pump should be placed in a dry and ventilated place to prevent the pump body, motor and other components from moisture, rust, corrosion, etc.

Operating parameters: The stainless steel centrifugal pump should be operated in accordance with the specified working parameters, including flow, head, voltage, current, etc., to avoid overload, overcurrent, overpressure and other problems.

Liquid properties: Stainless steel centrifugal pumps should choose the appropriate material and model according to the properties of the liquid to be conveyed to avoid corrosion, wear and other problems.

Maintenance: Stainless steel centrifugal pumps need regular maintenance and maintenance, including cleaning, lubrication, replacement of wearing parts, etc., to avoid failure or damage.

Safe operation of the sliding shed: When using stainless steel centrifugal pumps, it is necessary to pay attention to safe operation to avoid electric shock, fire, ** and other safety accidents.

In short, the correct use of stainless steel centrifugal pump needs to pay attention to the installation of Kairang dust location, operating environment, operating parameters, liquid properties, maintenance and safe operation and other issues to ensure its normal, safe and efficient operation.

Attention needs to be paid to the use of stainless steel centrifugal pumps:

1.The stainless steel centrifugal pump should be filled with liquid before starting, and it is forbidden to start the pump without liquid in the pump chamber.

2.Before using the stainless steel centrifugal pump, it should be confirmed whether the rotation direction of the motor is correct, and the correct rotation direction of the semi-open impeller is from the tail tremor of the motor, and the motor blades should run in the clockwise direction. The correct direction of rotation of the enclosed impeller is seen from the tail of the motor, which runs in a counterclockwise direction with fan blades.

3.If the leakage is found to be serious, it should be stopped for inspection and troubleshooting to prevent liquid from seeping into the motor and affecting the performance of the motor.

4.Lubricating oil should be added to the bearing bracket before use, and the oil level should be kept below the center line of the oil mirror, so as to prohibit the bearing damage caused by lack of oil.

5.Ambient temperature: Stainless steel centrifugal pumps generally work in an environment of 5 40 °C.

6.Time requirements: The inlet pressure shortage macro failure can not work continuously for more than 3 minutes when it is higher than 6500pa, so as to prevent damage to the stainless steel centrifugal pump.

7.When pumping pipelines of stainless steel centrifugal pumps, especially the connections of pipeline pumping, reliable sealing performance is required.

8.When installing a stainless steel centrifugal pump at the suction inlet, a foot valve needs to be installed at the suction inlet of the suction pipe.

The most important thing for stainless steel centrifugal pumps is that they cannot run idle, and another thing to pay attention to is the reliability of machine seal flushing. The following is an introduction to the general maintenance knowledge:

The maintenance of stainless steel multistage centrifugal pump is a more reasonable and effective means to monitor the best maintenance, and the regular preventive maintenance of stainless steel multistage centrifugal pump can greatly ensure the most important operating conditions of the equipment, so it is also very necessary to carry out regular maintenance. Stainless steel multi-stage centrifugal pump is divided into a level of maintenance and two levels of maintenance, the general level of maintenance according to the cycle of one week, the second level of maintenance cycle can be quarterly or according to the actual frequency of use, the implementation rules are as follows:

1. First-level maintenance rules.

1) Complete the daily maintenance inspection: check whether the pump flow rate and head parameters are abnormal; Whether there is any abnormality in the vibration of the water pump and the temperature of the bearing; whether the shaft seal is leaking, etc.;

2) Tighten the loose wire of each part, and the damaged ones are fully prepared for concealment;

3) Clean and inspect the motor bearing, and fill with grease;

4) The oil level in the oil bottle is lower than the scale line, and lubricating oil is added;

5) Check whether the balance pipe is blocked, and if there is any blockage, it should be cleaned up in time.

2. Secondary maintenance rules.

1) Complete the content of the first level of maintenance;

2) Whether the outlet pressure of the pump meets the requirements;

3) Check whether the bearings and oil slingers in the bearing box are in good condition, and should be replaced if they do not meet the requirements;

4) Check whether the shaft seal leakage at both ends of the bearing box meets the requirements, and repair or replace it if it does not meet the requirements;

5) Check whether the gap of the impeller wear-resistant ring meets the requirements, and repair or replace it if it does not meet the requirements;

6) Check whether the mechanical seal is damaged and replace the O-ring;

7) Replace the lubricating oil in the bearing box;

8) Check the motor bearing and replace it if necessary;

9) Check whether the insulation of each top winding of the motor is pure rock and whether it meets the requirements.

10) Check the alignment of the coupling;

11) Check the bearing and overall vibration of the pump.

Centrifugal pumps can be classified according to different classification standards, and the following are the common classification methods:

Classified according to the structural form: single-stage centrifugal pump and multi-stage centrifugal pump. Single-stage centrifugal pumps usually have only one impeller and are suitable for low pressure and high flow rates; Multistage centrifugal pumps consist of multiple impellers and are suitable for high pressures and low flow rates.

Classified according to the shape of the impeller: open centrifugal pump and semi-open centrifugal pump. The impeller of the open centrifugal pump is open, which is suitable for conveying liquids with more particles or fibers; The impeller of the semi-open centrifugal pump is open only in the front disc and is suitable for conveying liquids with less solid particles.

Classified according to use: water supply pumps, drainage pumps, chemical pumps, feed pumps, etc.

Classified according to the driving mode: electric centrifugal pump, diesel centrifugal pump, manual centrifugal pump, etc.

Different types of centrifugal pumps are suitable for different occasions and needs, and choosing the right centrifugal pump can improve the efficiency and service life of the pump.

Centrifugal pumps can be divided into the following types according to their use and structural characteristics:

1.Single-stage centrifugal pump: with only one impeller, it is suitable for conveying low-viscosity and clean liquids, and has the characteristics of simple structure and convenient maintenance.

2.Multistage centrifugal pump: with multiple impellers, it is suitable for conveying liquids with high head and high pressure, and has the characteristics of strong conveying capacity and high efficiency.

3.Submersible centrifugal pump: It is immersed in liquid as a whole and is suitable for conveying deep wells, underwater and other occasions, and has the characteristics of compact structure and small footprint.

4.Magnetic centrifugal pump: It adopts magnetic drive impeller rotation, no mechanical seal is required, and is suitable for transporting flammable, explosive, toxic, harmful and other special liquids, with the characteristics of safety and reliability, no leakage, etc.

5.Self-priming centrifugal pump: It has the function of self-priming, suitable for conveying low-viscosity and gas-containing liquids, and has the characteristics of easy start-up and simple operation.

6.Sewage centrifugal pump: suitable for transporting sewage containing solid particles, fibers and other impurities, with corrosion resistance, wear resistance and other characteristics.

7.Vertical centrifugal pump: the pump body and motor axis are vertical, suitable for small footprint, easy installation and other occasions, with compact structure, stable operation and other characteristics.

Different kinds of centrifugal pumps have different characteristics and scope of application, and users should choose according to the specific situation when choosing.

Stainless steel pipeline centrifugal pump is a kind of centrifugal pump made of special material, and its standards usually include the following aspects:

Material standards: The main material of stainless steel pipeline centrifugal pump should meet international or industry standards, such as GB T1220-2019 "Stainless Steel Bar", etc.

Structural standards: The structural design of stainless steel pipeline centrifugal pumps should comply with international or industry standards, such as GB T5656-2019 "Technical Conditions for Centrifugal Pumps", etc.

Interface standard: The import and export of stainless steel pipeline centrifugal pump should meet international or industry standards, such as GB T9112-2010 "Steel Flange" and other air information.

Test standard: The performance test of stainless steel pipeline centrifugal pump should comply with international or industry standards, such as GB T3216-2019 "Test Method for Centrifugal Pump", etc.

Marking standard: The model, flow, head, speed and other parameters of the stainless steel pipeline centrifugal pump should be clearly marked, and should comply with international or industry standards, such as ISO9906-2012 "Centrifugal Pump Performance Test".

It should be noted that there may be differences in the standard requirements for stainless steel pipeline centrifugal pumps in different countries and regions, and the specific standards should be selected according to the actual demand and sales losses.

The standard of stainless steel pipeline centrifugal pump mainly includes the following aspects of slow start:

1.Design standards: The design of stainless steel pipeline centrifugal pumps should meet the requirements of national standards or industry standards, such as GB T 3216, GB T 5656, GB T 5657, etc.

2.Material standards: The main materials of stainless steel pipeline centrifugal pumps should meet the requirements of national standards or industry standards, such as GB T 1220, GB T 3280, GB T 4237, etc.

3.Structural standards: The structure of the stainless steel pipeline detachment remorse pump should meet the requirements of national standards or industry standards, such as GB T 5658, GB T 5660, GB T 5661, etc.

4.Performance standards: The performance of stainless steel pipeline centrifugal pumps should meet the requirements of national standards or industry standards, such as GB T 3217, GB T 5659, GB T 5662, etc.

5.Safety standards: The safety of stainless steel pipeline centrifugal pumps should meet the requirements of national standards or industry standards, such as GB T 3219, GB T 3220, GB T 3221, etc.

6.Inspection standards: The inspection of stainless steel pipeline centrifugal pumps should meet the requirements of national standards or industry standards, such as GB T 3218, GB T 5663, GB T 5664, etc.

7.Mark standard: The mark of stainless steel pipeline centrifugal pump should meet the requirements of national standards or industry standards, such as GB T 5655, GB T 5665, GB T 5666, etc.

IHG stainless steel corrosion-resistant pipeline annihilator pump is also known as (stainless steel Shishi pipeline pump, stainless steel centrifugal pump, stainless steel pipeline centrifugal pump, stainless steel pipeline centrifugal pump, pipeline booster pump, hot water circulation pump, hot water pipeline pump, etc. is the company's use of IS type centrifugal pump performance parameters and the length of the structure of the old pipeline pump, in strict accordance with the standard ISO2858 and national standards to design successful high-efficiency and energy-saving products, is a new vertical centrifugal pump instead of IS-type centrifugal pump, vertical multi-stage centrifugal pump and other conventional products.

Centrifugal pumps can be divided into several types according to different classification standards, and the following are the common types:

According to the different flow rate and head, it can be divided into single-stage centrifugal pump and multi-stage centrifugal pump;

According to the number and shape of impellers, they can be divided into single-suction centrifugal pumps, double-suction centrifugal pumps and multi-stage impeller centrifugal pumps;

According to the different axis directions, it can be divided into horizontal centrifugal pumps and vertical centrifugal pumps;

According to the different working environments, it can be divided into ordinary centrifugal pumps, corrosion-resistant centrifugal pumps, chemical centrifugal pumps, etc.;

The model of centrifugal pump is generally composed of letters and numbers, the letters usually represent the purpose of the pump, the characteristics of the cavity structure and the material, and the number represents the flow, lifting head and speed of the pump. For example, IH50-32-125 indicates a centrifugal pump with an inlet diameter of 50mm, an outlet diameter of 32mm, and an impeller diameter of 125mm for the chemical industry.

Let's give you an example: D(G m excavations f y) 6-25*8

d represents a multi-branch loose banquet class horizontal centrifugal pump; DG multistage boiler for mammoth silver water pump; DM multistage mining centrifugal pump; DF multi-stage corrosion-resistant centrifugal pump; DY multistage centrifugal oil pump; 6. The design point flow rate of the pump is: 6m h; 25. The head of the single-stage design point is 25 meters; 8 is the number of stages of the pump, which is 8 stages. Hope it helps!!