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  1. chicopee

    Friction error in MSC Adams

    In your original post, it is written ".....static friction coefficient must be greater than or equal to 0 and that the dynamic one must be greater than or equal to the static one..." It is odd to have a dynamic coefficient of friction greater than a static coefficient of friction, normally it...
  2. chicopee

    Retube process key steps

    Slightly outside the scope of the OP-- When pulling out the tubes through the tube sheet holes be careful that the corroded surfaces of the tubes could damage the holes.
  3. chicopee

    5" Slab Max Capacity for a Warehouse

    Dunnage or spread footings under the legs of the racks could be a viable solution. Check out loading from hydraulic and lattice boom cranes which operate on all types of soil found in construction sites. If skeptical do a test load.
  4. chicopee

    Weld repairs by belzona

    If I remember correctly, pits depth of more than 50% of wall thickness should not be repaired per NBIC.
  5. chicopee

    Superheated steam question

    More equipment to desuperheat steam the more it cost. So it has to be evaluated.
  6. chicopee

    Fine Thread vs Course Thread

    It all depend what the sheet metal is used for. I have seen seen and also used successfully screws of sheet metal for panel doors and air ducts, although, I always had a preference for rivets. It all depend on the application of the sheet metal.
  7. chicopee

    Inquiry of Practical Design Formula for Fire-tube Boiler.....

    You have to consider more than design consideration to fabricate boilers in America and Western Europe. Quality control based on the NB/ASME specs is one aspect if you intend to fabricate boilers in the parts of the world that I mentioned. In China you probably could get away with it .
  8. chicopee

    Thermal oil boiler cracked tube

    Flame impingemnt seems to have caused this nightmare. Tube replacement is one way but you have to determine the cause before any repair is done. Also before you undertake tube replacement make sure that there is no other tubes that may have been distorted otherwise you could have interference...
  9. chicopee

    CO2 Pipe Sizing

    Your success will depend on your knowledge of thermodynamics. For references Perry Chemical Engineering and Kent "Power" handbooks have an abundance of information on CO2 however to understand the information, knowledge of thermodynamics is essential. Even if you can procure handouts from CO2...
  10. chicopee

    Redesign for Latent Load

    To minimize condensation, reduce the air flow from the AC so that it runs for a longer period of time. Frequent cycling the AC "on" and "off" does not allow enough time to reduce condensation. Obviously there are other factors such as having too much outside air and too much water vapor from...
  11. chicopee

    Integrity of Horizontal Atmospheric Tank

    If your company is strap for money, instead of purchasing a new tank, look a second hand tank but beware of past experiences and of deleterious details on inpection reports on that tank. For second hand tanks, I would research second hand Propane pressure vessels which are abundant for purchase.
  12. chicopee

    Fire proof insulation ?

    TugboatEng- Your idea is viable but for convection to be effective I would leave gaps on the bottom and top of the sheet metal and the spacer holding the sheet metal to the bulkhead should be fire rated. A similar idea is adopted in the National Fire code, NFPA 96 for commercial cooking...
  13. chicopee

    ASME - oval manhole

    I do not want to nitpick but I could not help it when I noticed that when using to top drawing as a reference, the front drawing is upside down while the right side drawing is correct.
  14. chicopee

    Submerged cooling coil system

    Assuming you had courses in thermodynamics, and transfer and physics, you will first assume no heat transfer to the surrounding of the tank and no gain in the heat absorb by the tank wall. The equations to consider include the mass flow rate of the fluid entering and exiting the coil, the first...
  15. chicopee

    How to Change Convective Heat Transfer Coefficient of Coolant

    Have thought of an alternative method to keep the chip cool such as by the chip by mounting an external fan just as it is being done with PC's.
  16. chicopee

    equation to size the room de-humidifier

    LI, the 24.3kg/hr would be a valid number if the OP intended to have re circulation of room air maintained at a relative humidity of 70% by dehumidifing to a relative humidity of 50%. For lack of exit temperature from the dehumidifier, the 24.3kg /hr was based on the dry bulb temperature of...
  17. chicopee

    equation to size the room de-humidifier

    Ll, there is no re circulation of room air in the calculations. If re circulation was to be accounted then there are several factors such as occupant load, moisture generating equipment, time element to reach the 50% relative humidity, weather conditions affecting ambient air leakage into the...
  18. chicopee

    equation to size the room de-humidifier

    Doing your problem long hand while using English units and then reverting back to metric for an answer I got 53.6 Lbm/Hr (=24.3Kg/hr) of water vapor to be removed as condensate by assuming that the exit temperature from the dehumidifier to be the same as the inlet temperature of 86dF (=30dC)...
  19. chicopee

    equation to size the room de-humidifier

    Forget the equations that you requested instead make a copy of a blank psychrometric graph to determine the amount of water vapor to be removed by the dehumidifier. If you took thermodynamics in the past your text book will have such chart. The only thing that I see from your data is the exit...
  20. chicopee

    HOTEL KITCHEN PROPER VENTILATION

    Is the exhaust hood fan connected directly by shaft to the 7.5 hp motor or is there a set of belts with pulleys to the 7.5 hp motor? What I am driving at is to increase the RPM of the exhaust fan which can be relatively easy to change with a belt and pulley system as long as the maintenance...

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