The minimum submerged depth of pump
The minimum submerged depth of pump is to ensure the normal operation of the pump necessary conditions, the manufacturer’s samples are marked with clear data, forever pump pointed out that the data is calculated based on:
1. According to the calculation of the pump NPSH to ensure that the pump does not cavitation.
2. For the submersible pump in the upper part of the motor, if the motor cooling circulation system is not installed, the whole motor is immersed in the water to cool the motor stator.
3. The minimum submergence depth is to ensure that the pump is running, the suction pool water does not occur whirlpool, the air is not involved in the pump inlet, and to ensure uniform distribution of the liquid into the pump speed.
Moreover, the permanent pump plant found that some pumping stations due to flow and suction pool conditions, the pump running after the water level changes greatly, the suction pool water level drops, resulting in the actual submerged depth below the minimum submergence depth, resulting in the pump can not run properly, Cavitation occurred. Such as a pump station, suction pool minimum water level elevation of 1m, up to 4.5m, water depth difference of 3.5m. If the pumping station is designed according to 1m elevation, the whole pumping station will be dug deeply. Raising the elevation design will cause the submerged depth to be less than the minimum submerged depth.
- Published in Blogs
Increase of the water make the head reduce which is provided by water pump
The pump operates in a high efficiency zone, minimizing the shaft power, which can be difficult for different models. Panda pump in the analysis of centrifugal pump characteristics, based on the relationship between pump efficiency and flow indirectly obtained speed ratio M, for solving such problems provide a method. The use of frequency control system, real-time regulation of the pump speed, and meet the different needs of water supply, is a new scientific method of energy saving, in theory, can basically avoid the unnecessary loss of valve regulation.
First of all, the performance curve of the pump is on the flow and head of the quadratic curve, with the increase in water, water pump to provide the head is constantly reduced. Pump performance curve Centrifugal pump in the rated speed characteristic equation is: where the virtual total head for the zero flow is a constant associated with the pump, when access to frequency conversion equipment, with the pump speed continues to decline, parallel to the pump curve shift. The characteristic becomes: which is the speed ratio of water pump in addition there is a very important parameter curve, the curve increases monotonically by the monotonous increase in the peak monotonically reduce the peak should correspond to the design curve on the characteristic point, and the corresponding point The flow rate for the rated flow, the pump operating point in the operating point, the minimum loss. The farther away from the design conditions, the lower the efficiency.
Moreover, the industrial pump to pump the efficiency of the restrictions, the operating point can not deviate from the operating point too far the general efficiency of the pump must be above the peak. This will not be a low efficiency of the pump range, taking into account the pump frequency control ratio is limited, can not let the pump speed is too low.
Based on the above conditions, and then use the similar conditions of parabolic, you can get on the curve of a variable frequency pump operating point of the feasible area, when the pump operating point out of this area efficiency will be due to low and not meet the requirements. Forever pump factory that there is a need for a similar situation to do a little parabolic interpretation of similar parabolic equation in this equation on the various working conditions in the head of the square of water into a fixed proportion and has a very important nature – run time The efficiency is almost the same.
- Published in Blogs
What industries will high-lift submersible pumps be used for
High-lift submersible pumps can be widely used in sewage sampling, large flow of liquid transfer, low noise continuous workplace; large, large aquarium, small swimming pool, fish pond water, reservoir replenishment, fountain, fish pond feeding and other purposes … …
And also can be used in these industry:
Fresh water, seawater quality analysis, sewage treatment, sewage sampling, water purification, ship bilge sewage discharge, aquaculture ornamental, water cycle transfer, agricultural spraying, irrigation, ground, carpet cleaning, etc .; environmental protection, medicine, shipbuilding, fishing, industry, agriculture , Home economics and other industries.
- Published in Blogs
Balance measures of Single-stage centrifugal pump impeller
1.Use double-suction impeller to make the axial force offset each other.
2.Open the balance hole or install the balance tube.
In the impeller on the rear cover of the impeller population to open a few counterbalancing holes, so that the front and rear cover space, while in the back cover of the axial side of the additional seal ring, the diameter and impeller inlet ring diameter the same. This structure is simple, but an increase of internal leakage, but also make imports more turbulent flow, lower single-stage centrifugal pump efficiency. Open balance hole is still 10% -25% of the axial force from the bearing to bear. You can also install the balance tube, from the rear cover near the pump casing openings, the balance pipe connected to the single stage centrifugal pump suction chamber.
3.Use balanced blades, leaves the back of a few additional radial blades, rotating, the impeller back pressure will be reduced to reduce the axial force.
- Published in Blogs
It is not easy to observe and maintain pump when submersible pump in water
It is not easy to observe and maintain pump when submersible pump in water.The whole machine soaked with the water is easy to corrosion, so we recommend the suction pump to allow a high degree of suction on the selection of self-priming pump better. Because many people do not understand the pump products, in the face of trying to lower the water or other liquids pumped to the height of the first thought is the submersible pump products, because many users only know that there are submersible pump products, and do not know can Installed in the ground then a suction pipe into a variety of liquid inside and pump suction connection can also be pumped up to a variety of self-priming pump products.
1.If the mobile pumping with self-priming height within 5-9 meters flow 100m3 / h or less you can use small gasoline engine pumps, small diesel pumps.
2.If you need more flow can choose large flow of self-priming pump products.
3.Since the suction height of 5 meters within the flow 30m3 / h head 30 meters below the recommended selection of small stainless steel self-priming pump.
4.If the suction is a corrosive liquid can also be used high-suction suction pump products.
- Published in Blogs
The difference between multi-stage pump and single-stage pump
1.Single-stage pump means that the pumps have only one impeller, and the highest lift is 125 meters;
2.Multi-stage pump means the pumps have two or more impellers. They can absorb and pressure water in different levels and times, so that the water can be ascend to a high position. The lift can be changed by increasing or decreasing the number of stages of pump impeller.In the case of single-stage pump head needs to be equipped with two motors, multi-stage 
pump can increase the number of impellers to equipped with four motors, which can improve the life of the pump and reduce unit noise.
3.When actual lift of the pump is less than 125 meters, it can accord to the area of the pumping station, pump prices (multi-stage pump is generally higher than the price of a single-stage pump), and other factors considered in the selection of a single-stage or multi-stage pump.
- Published in Blogs
The relationship between performance requirements, flow and head of pumps
1.Pump flow and head of the curve should be no hump running stability curve, from rated flow to zero flow of the lift is rising, the value does not exceed the rated flow of 20%.
2.Pumps in the long-term continuous operation under maximum conditions. Water pump in the design conditions of the parameters to ensure that the maximum operating conditions and flow to ensure that the head.
3.Vertical centrifugal pump in a variety of operating conditions should ensure that the impeller does not occur cavitation phenomenon.
4.Critical speed of the pump For rigid rotors, the pump’s first critical speed should not be less than 125% of the maximum operating speed.
5.Horizontal centrifugal pump rotor and its main rotating parts should be static and dynamic balance test. Static balance accuracy of not less than GB9239 in the G6.3 level, dynamic balance accuracy of not less than GB9239 in the G2.5 level.
6.Abnormal vibration should not occur at any speed within the normal operating range.
7.The pump set is designed by the supplier and provides complete pump information to the purchaser.
8.Centrifugal pumps are provided with removable end caps to allow access to the internal components without moving the motor or the inlet and outlet pipes.
9.Pump inlet and outlet can withstand the stress of the pipeline may be generated without deformation. The allowable range of thrust and torque applied to the pump interface by the power plant piping is provided by the supplier.
10.All impellers shall be made of one integral casting.
11.Pump seal should be easy to disassemble, and can effectively prevent too much leakage between the pressure level to ensure high efficiency.
12.Base can withstand the weight of each component and the power of transmission.
- Published in Blogs
Energy saving method of pump
Customers often ask the energy-saving effect of our products when purchase pump products.Our manufacturers will do everything we can to design energy-saving products in the production process, but customers also need to master the skills when receive products, so as to pipeline pump Product energy-saving effect to maximize. Nanjing Forever Sewage Treatment Equipments Co,.Ltd summarizes the following methods to tell you how to use pump energy-saving:
1.Try to shorten the pipeline.
2.Do not use “anti-aircraft gun” type outlet. As the water pipe to increase energy consumption, while making the pump outlet is facing the pool.
3.Try to increase the outlet pipe diameter.
4.Promptly clean up the pipeline infarcts. Foreign matter left in the inlet pipe, impeller or diversion shell flow path, will reduce the amount of water.
5.Use direct drive coupling as far as possible , which is due to the direct drive coupling belt transmission efficiency.
6.In ensuring the premise of clean water, you can remove the filter.
7.To seal the pump parts carefully check to avoid pump intake. If the pump into the air, the water will be significantly reduced.
8.Do not use the diesel engine or gasoline engine when you can use motor engine, do not use single-phase asynchronous motor when you have conditions to use three-phase asynchronous motor.
- Published in Blogs
Anti-wear coating
The main anti-wear coating resin anti-corrosion wear-resistant coatings, rubber anti-corrosion wear-resistant coatings, quartz glass and water-resistant ceramic wear-resistant materials.
890 abrasion resistant compound is a ceramic composite used to repair and protect metal surfaces that are subject to abrasion. The compound has good abrasion resistance and adhesion to the base metal. However, 890 wear-resistant compound coating thickness must be 6mm or thicker, which some of the narrow runner or start the more stringent requirements of the rotor is not appropriate, the same, add a layer of wear-resistant liner blade to solve the fan Impeller wear also has such problems.
- Published in Blogs
Continuously improve product performance and quality, optimize the management service system, a complete after-sales service
Nanjing Forever Sewage Treatment Equipments Co,.Ltd guarantees the goods with the best quality, the use of first-class technology and made with the best materials, and in full compliance with national, industry, corporate standards or contract specifications, to ensure that the equipment is properly installed, the normal operation and maintenance, With satisfactory performance over its useful life. After the completion of equipment manufacturing, equipment quality, performance requirements in accordance with the relevant standards and the provisions of the contract for detailed and comprehensive inspection, so that the quality requirements to the demand side, and issued a product quality certificate.
Site inspection and acceptance
Upon completion of the installation of the equipment, the Company will appoint engineers to instruct the equipment to run the test and inspection according to the requirements of the purchaser. If the test results show that the equipment performance is deviated from the original technical requirements due to equipment quality problems, the Company is responsible for settlement. If necessary, repeat the test until the requirements are met.
Installation guidance services
The installation of the equipment shall be in accordance with the detailed construction drawings prepared by the Company. The company in the installation process to provide supervision and guidance, responsible for confirming the completion of equipment installation, only to be confirmed before entering the next stage of debugging equipment.
Run the debugging instructions
After the installation of the equipment, the Company will supervise the trial operation of the demand side, and jointly formulate the pilot plan with the demand side and guide the pilot project.
Site technical services
In order to successfully put the equipment into operation, the Company appointed skilled, qualified technical personnel to the site for technical services.
- Published in Blogs