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parsottam last won the day on October 22 2018

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About parsottam

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    be mechanical
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    BVM, V V Nagar

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  1. I am looking for major difference in 2nd and 3rd edition of API 675. Can any buddy help me..
  2. In centrifugal compressor if suction pressure remain constant, discharge pressure also constant, no change in physical parameter of compressor and accessories and temperature is reduced what happen to the compressor capacity. what about volume flow is it remain constant or reduced? what about mass flow is it increased or the constant?
  3. Obvious it is 4 cylinder engine as specified in question it self.. This different arrangement are for the load balance is the prime...the animation is for cranks shaft outline.. if above is not correct, can you elaborate the crank shaft design with load distribution in details?
  4. Sequence of power delivered in a multi cylinder engine called firing order. It gives balance to engine and load is uniformly distributed in crankshaft. Proper firing order minimise vibration, smooth running and gives high life to the engine. Firing order for 4 stage engine may be 1-3-4-2, 1-2-4-3, 1-3-2-4, 1-4-3-2 depending on design of crank shaft and cylinder by designer.
  5. Pre-heat is required for the following reasons: (1) It lowers the cooling rate in the weld metal and base metal, producing a more ductile metallurgical structure with greater resistant to cracking. (2) The slower cooling rate provides an opportunity for any hydrogen that may be present to diffuse out harmlessly without causing cracking. (3) It reduces the shrinkage stresses in the weld and adjacent base metal, which is especially important in highly restrained joints. (4) It raises some steels above the temperature at which brittle fracture would occur in fabrication. Post heating is required to remove further residual stresses present in the weld pool after heat treatment process also. If post heating is not done, then residual stresses develops as cracks and propagates throughout, resulting in the failure of the material. Also Preheat/Post weld heat treatment can be used to help ensure specific mechanical properties, such as notch and toughness.
  6. In many over head crane with manual operation, chain drive is provided. In that one wheel is provided with chain and with help of chain one can rotate that wheel to move the crane accordingly... One more example, manual operated shutter of warehouse, where chain is provided to open and close the door as required. Sizing and selection of that chain, and chain wheel is based on applicable load.
  7. In case of coal based power plant, material handling system (supply of coal to boiler and waster management) is most common problem. Maintaining quality of water , Other routine problems like stream trap failure, operation of High pressure pump, maintaining the quality of fuel to maintain pressure and temperature in boiler etc..in case of steam turbine leakage of coil /tube bundle of heat exchanger , etc. There are many other problems which can be eliminated by preventive maintenance.
  8. You need to provide complete details of your problem, so one can help you to get solution, with half details situation may be worse then present.
  9. further to the above reply from Mr. D, for wheel, it is required higher energy required to rotate square or rectangle wheel than circular wheel.
  10. Sub zero temperature is temperature below zero degree Fahrenheit temperature. Critical temperature is the temperature of specified gas, there is no phase change even though increase in pressure of gas.
  11. In most of the freezer cooling coil is provided at bottom surface, if you put bottle in horizontal position has higher contact surface with cooling coil compare to vertical position. Heat transfer by conduction is at faster rate than convection. hence horizontal bottle will cool faster
  12. cylinder volume, V(mm3)=(3.14/4)*D^2*L D= inside diameter of cylinder, mm L = length of cylinder, mm Accurate calculations: piston displacement + swept volume
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  13. if the turbine blade breaks it advisable to replace the blade with new one rather than welding. in any case you want to use the same then ask weld procedure from Original Equipment manufacturer along with recommendation for weld metallurgy, testing requirements and requirement of post weld heat treatment. After welding it further required for profile machining and balancing.
  14. the basic difference in air condition and refrigeration are: Air conditions is the controlled atmosphere in which you need to control temperature (may be lower or higher), humidity and air quality. where as in refrigeration need to maintain only lower temperature as required.
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