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Showing posts from June, 2020

Cavitation Kya hota h?

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Formation of the bubble in the suction line of the pump is called cavitation . Suction line k andr bubble form hokr pump k impeller pr strike krte h Effect of the cavitation on the pump - Cavitation ki vjh se hi pump sound krta h Cavitation ki vjh se pump ka impeller jldi khrab ho skta h or damage bhi ho skta h. Pump ka impeller khrab hone pr pump ka outlet pressure down ho jayega. Cavitation aik bhut hi important phenomena hoti h jisko aik engineer ko smjhna bhut jruri h ,is problem ko smjhe bina vh pump ki problem ko nhi smjh skta
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Air compressor kya hota h ?

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Air compressor aik device hota h jisme air ko compress(संपिडीत) Kiya jata h ,or compressed air ko aik tank m store krk compressed air ka use Kiya jata h.Storage tank k andr aik filter lga hota h Jo air k andr se moisture ko remove krta. Apne bhut bar dekha hoga पंचर निकालने wale ki dukan pr aik tank dekha hoga .उस tank k andr air ko compressed krk rkha jata h or uska use Kiya jata. Air compressor two type ka hota .....(1)Dynamic compressor (2) Positive displacement compressor.     Generally long running operation k liye dynamic compressor ka use chemical,petrochemical, pharma  and various industry m Kiya jata h. Short time k liye positive displacement compressor ka use Kiya jata h 
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What is a pump?

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Pump is a device which moves fluid from one place to another place. There are two types of pump- Centrifugal pump & Positive displacement pump Centrifugal pump k discharge valve ko km ya jyada Kiya ja skta  Positive displacement pump k discharge valve ko km nhi KR skte Centrifugal pump ko start krte time discharge valve ko bnd bhi Kiya ja skta h  PDP ko start Krne se phle yh dhyan rkhna jruri h ki discharge valve closed nhi hona chahiye ,closed hone pr discharge line leakage ho skti h
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Air compressors function based on a very simple principle. When the air is compressed, its volume decreases whereas the pressure increases. The most common way to achieve this is with the help of a reciprocating piston. There are compressors which employ rotating impellers for the purpose of creating air pressure, but I will discuss the different types in a separate article. Those which are built around a reciprocating piston are more common, and if you’re familiar with how internal combustion engines work, you will know piston compressors function in a similar manner. Each reciprocating piston compressor has a crankshaft, connecting rod, a piston, cylinder, and a valve head. In order for the entire mechanism to work, you need power. Air compressors are usually powered by electricity or gas depending on the model. Most compressors also have a tank which is there to store compressed air for the purpose of keeping the air pressure within a set range while powering various air tools. But, let’s get back to the mechanics of it (I used an image of a liquid reciprocating piston pump to explain this (source: NVC), but with air this works basically the same) reciprocating piston At the top of every compressor cylinder there is a valve head that contains both the inlet and discharge valve which are basically metal flaps. These open and close and are located on top of the valve plate. When the piston moves down inside the cylinder in the space above the piston a vacuum is created. Now, here’s the clever bit. The difference in pressure on the inside of the cylinder to the outside allows the atmospheric pressure to open the inlet valve. The air then enters the area where the vacuum used to be, and is compressed by the piston which is now going up. The inlet valve closes and the discharge valve is opened. The compressed air is stored inside the tank thereby increasing the pressure

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What is the reason behind cooling water pump outlet pressure down?

May be air locking in the pump May be cavitation in the pump May be dust particle in suction line of the water  May be air inter from outside into pump May be temperature of the water is high 
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Hello my dear friend ,if you want to know industrial knowledge please like my page.i will give all information on industry ,whom should join Pvt industry or not .

How can you join?  What will interviewer ask?  How can you prepare? Where you can join?         
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