Continue to Site

Eng-Tips is the largest engineering community on the Internet

Intelligent Work Forums for Engineering Professionals

  • Congratulations waross on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Recent content by mduplessis

  1. mduplessis

    Conveyor design

    Most of the suppliers of conveyor belting and chains have booklets and text books on design of conveyors. They are always eager to provide these books. One such book is from Goodyear on belt conveyor and belt elevator design. I can not remember the correct name of the textbook but its something...
  2. mduplessis

    FATIGUE CHARACTERIZATION

    Fatique calculations is highly statisticaly. The objects geometry plays just as large a role as the material itself. As far as I can remember in one formula half of the tensile strength is used, multiplied by up to six emperical and statistical factors. These are for surface ruffness, object...
  3. mduplessis

    pipe material for instrument air

    The use of galvanized pipes for pneumatic or compressed air is quite common in my experience. If you are worried of flaking and rust problems just make sure that there is adequate drying, draining and trapping of moist in the air, which is good practice in any case. Personally I do not know of...
  4. mduplessis

    Design of 30 tonne split water tank

    engoz I have no experience on such tanks but just a thought; why not use concentric cylinders? I guess you will have less problems with stresses since both tanks will be cylindric. The effect will be the same as simply splitting the tank through the middle.
  5. mduplessis

    Conduction and pressure question

    ecampos Contact resistance between two solids is caused because surfaces are not perfectly smooth. The materials are in contact at relatively few places. The gaps are filled with air, sometimes liquid or vacuum. Applying pressure improves conductivity by reducing the contact resistance because...
  6. mduplessis

    Soldering Iron tip temperature

    mryan Using Q=M x Cp x dT will not help you. It would require that Q is Energy (i.e in Joule) and not Power (Watt). (in SI system). I think that is where your calculation went wrong. Rather uses a energy balance: Power in=Heat loss from tip under steady state. Radiation heat loss will play a...
  7. mduplessis

    Conduction and pressure question

    Answering the first question, Pressure does have an effect on the thermal contact resistance of two nonsimilar solids. If the thermal resistance is given by 1/((hi)A), hi is around 3000-4500 W/m2K for Fe-Al interfaces and a marked decrease will be noted at the yield point of the Aluminum. How...

Part and Inventory Search