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  1. arun17

    Performance testing of shell and tube type heat exchanger

    Dear friends , What are the guidelines for performance of shell and tube type heat exchanger. Thanks "Knowledge is power"
  2. arun17

    Isolation Transformer test

    Dear friends, It is a 100 KV, single phase isolation transformer with 20 amp. rating. This is not a step up or step down transformer. It is a 1:1 transformer. The isolation between primary to seconday is 100 kv and secondary to ground also 100 kv. Thanks Arun "Knowledge is power"
  3. arun17

    Isolation Transformer test

    Soryy friend , I am testing insulation resistance with a 1000 V megger. This resistance tells us something about the health of insulation. If there is a degradation of insulation this resistance goes down and more leakage occurs through the insulation which ultimately results in loss of voltage...
  4. arun17

    Isolation Transformer test

    Hi! Thanks for your advice. I have already done maintainance test with 1000 v megger. I heard about lightning impulse test. Can that be used for Isolation transformer. I would like to know if ISO or any othe code gives guideline for it? Arun "Knowledge is power"
  5. arun17

    Isolation Transformer test

    Hi friends! I am a mechanical engineer, but I need to know the isolation between primary and secondary and secondary to ground for a 150 KV type isolation transformer. Can anybody suggest where I can find the procerure for this. Is there any ISO guideline for this? Thanks Arun "Knowledge...
  6. arun17

    Illumination Level for industrial building

    Hi, I would like to know what is the general level illumination(in LUX) for an industrial building. Is there any website for this info? Thanks "Knowledge is power"
  7. arun17

    ePTFE Gasket Tape

    HI , We are having a pressure vessel( operating pr. 100 psi) whcih has an end cover which is abot 8 feet in dia. There are two grooves on this flange for gasket. Previously we were having rubber gaskets in this grooves. Depth of these grooves is 5 mm. Can one use ePTFE gasket tape for this...
  8. arun17

    Crown radius for torispherical head

    Thanks for the reply. But if you see the formula given in the code, the thickness of a torispherical head is : t=P*L*M/(2*S*E-0.2*P) + CA where L is crown radius M=.25*(3+sqrt(L/r)) ris knucke radius. From this I can conclude that thickness is proportional to crown radius, so I should keep...
  9. arun17

    Crown radius for torispherical head

    Hello, I would like to know how to select or decide about the crown radius for a torispherical head for a vessel. Is there any relation of this radis to the shell radius for optimum design. In code it is said the knuckle radius dhould be 6 % od the crown radius, but nothing is stated about how...
  10. arun17

    Code Stamping of ASME vessel

    What does it mean by words SR and PXR on the name plate of a U coded vessel , just below U stamp Thanks "Knowledge is power"
  11. arun17

    Titanium -Ceramic Joint

    What kind of strengths could be achieved with brazed joints? "Knowledge is power"
  12. arun17

    Titanium -Ceramic Joint

    No it is not brazing. I am talking about diffusion bonding. This kind of joint is particularly useful for making Ultra High Vacuum components. Brazed joints can not be used for UHV applications. "Knowledge is power"
  13. arun17

    Titanium -Ceramic Joint

    How Titanium -Alumina ceramic joints(by diffusion bonding process) are made. We do not want to use adhesives.Is there any site or any practical data available for this. What should be the temperature, pressure and intermediate material required for this making this joint. "Knowledge is...
  14. arun17

    Vacuum System

    What is your pumping rate and the type of vacuum needed. Normally making a vacuum vessel is not very difficult. Largly it depends on the order of vacuum needed and the operating temperature.If Ultra High Vacuum is needed then special skills are required. Contact Peiffer Vacuum Germany...
  15. arun17

    Centrigugal Blower

    Thanks tonyh and smckennz. But a little more clarification. I have mentioned the flow rate of 55 cfm and 18" pr. drop in pipeline( water column) or 12 m of process gas. If I select an air blower which can give 55 cfm and 18" water column, I should be able to use the blower without changing the...
  16. arun17

    Centrifugal blower for high pressure air

    Hi friends, I want to select a centrifugal blower for air at 36 atm. pr. The voulmatric flow rate for this application is about 55 cfm and pr. drop in pipe line for this flow rate is about 18". The problem is I don't know how the volumatic flow rate of a particular centrifugal blower changes...
  17. arun17

    Centrigugal Blower

    Hi friends, I am posting this question about centrifugal blower because there is good similarity between a centrifugal pump and a centrifugal blower. I want to select a blower for a gas which is about 36 times heavier than air at 1 atm. pr. The voulmatric flow rate for this gas is about 55 cfm...
  18. arun17

    Colour codes for piping

    I would not be able to tell what is asked for here, but I would like to ask in addition to what Buck29 asked, that could anyone suggest where can I get a colour code for SF6 gas piping. Thanks "Knowledge is power"
  19. arun17

    Serial port handling in linux

    Hello, (1)I am trying to write a program for serial port communication in Linux. I have created a class in which I initiallize the port parameters using a termios structure and open the port. The class also has a function which can return a FILE pointer(using fdopen) attached with the port. This...
  20. arun17

    SPLINE SOURCE CODE IN VISUAL BASIC

    I have developed a small module in VBA which reads the data from file and draws the spline in Autocad. There are some bugs also. If you want........ "Knowledge is power"

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