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  • Users: johnp
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  1. johnp

    Base to Equipment weight ratio

    In designing bases for equipment - where does the base to equipment weight ratio come from? Some recommend a factor of 2, 2.5 or 3. When designing screen support girders the mass of the screen does not come into the picture. It only appears in the primary mode of vibration where the screen is...
  2. johnp

    Design of Tailings Dams

    We are looking at the design of a Tailings Dam - also called a slimes dam, residue dam, or mine dump. It is proposed as 500 m diameter x 50 m high. I have been told that Tailings Dams collapse at heights in excess of 30 m. The difference betwen an earth-fill dam, and a tailings dam is that...
  3. johnp

    Reinforcing heavy equipment foundations

    I am designing foundations for FAG Mills and Ball Mills. I need guidance on use of nominal reinforcing steel. Most of the guidelines relate to beams for building construction, or columns up to 1 m square, and to concrete slabs. If I apply those to raft foundations 2 to 3 m thick the numbers are...
  4. johnp

    Discharge through Weirs & Orifices

    Why is flow from a weir referenced from the Invert Level while horizontal flow from an orifice referenced to the nozzle centreline? I have developped a formual which covers both for any head. It has been useful for calculating flow from hoppers, gutters, launders, and even handling slurry...
  5. johnp

    Long piping - expansion

    Long lengths of piping resist expansion movement. Local movement takes place within 40 - 60 diameters of a bend. Calculations show extent of "possible" movement, but "probable" movement actually witnessed on site over time is far less.<br> This is particularly true with PE piping. Simple...

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