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  1. capliard

    Optimisation of ash stockpile height to minimise haul truck diesel costs

    For a small stockpile, I would start by determining bench height. Then determine reasonable area for machinery on top bench. Then work my way down bench by bench until I have volume I need. Then make sure a ramp at 10% grade can go around it. For a large stockpile, say a mining wastepile for...
  2. capliard

    Blasting of pillars to cause ground subsidence and stabilization

    Hi Hammer, We are a active mine operation with a surface subsidence problem. The operation is under national highway infrastructure, gas line, railway, etc. For the past 8 years, we have had to intervene at regular intervals with filling and pressure grouting. We know we haven't solved the...
  3. capliard

    Expected 'flatness' tolerance for blasting bedrock level pad

    We've had an occurence in the Abitibi where a pad was blasted for a large mill and a big garage. The average achieved grade was about -1.2m with 4'' blastholes. The job was done buy mining D&B contractors without specifications from the construction group. As mining guys, we wanted to make sure...
  4. capliard

    Existing Ventilation Fan Issues -- Looking for industry standards re: installation and configuration

    Any idea on the level of vibration the fans are experiencing when in operation ? I use this on Iphone to monitor Vibrations : Link A stalled condition produces vibration and will damage equipment at some point. Are the fans identical apart from rated HP? If so, why are they different? If not...
  5. capliard

    Parallel work of fans vs. pumps

    The rule of thumb : a single fan will produce about 66% of flow VS twin same 2 fans in parallel. Rule ot thumb no2 : A loss of a fan in a 3 fan parallel arrangement will leave you with about 90% of full flow. To have real answer, look at fan curves vs system curve. CAPL Ingenieur Minier...
  6. capliard

    Force Required to Open Door

    What I see missing is the pressure difference between side. It's a pressure vessel, there has to be a pressure differential. In mining, we often use a small length but large diameter strong cylinder in conjuction with a longer but leaner weak cylinder. The small one is there to help ''break...
  7. capliard

    Heat gain from vehicle exhaust?

    Jams, your assumption of energy consumption is not correct. Power input at motor is not rated HP. Power input is rate of fuel consumption. At iddle, little fuel is consummed. 1- Make your people understand that motors need to be shut in the workshop. Except for moving vehicules in and out. 2-...
  8. capliard

    How to size a bell mouth intake/supply?

    A bellmouth is used to reduce shock losses at entry. It's not so much about size, it's more about geometry. Say your fan is 54'' inches diameter, then contact supplier asking for assorted inlet. Check-out McPherson Mine Ventilation Chapter 5 in the appendix(free download on the net) for Shock...
  9. capliard

    AHU heat gain due to supply fan motor

    In a Mining Environnement, All work (excluding work done against gravity) translates to Heat Gain. And for fans, yes, the mesured electric power at fan input will ALL be translated to heat. Ingenieur Minier. QuTbec, Canada.
  10. capliard

    Fan Heat Gain

    @ Lilliput1. No. The Energy goes into Potential Energy of Rock. Or Heat. Explanation : The energy balance is the same, whatever the counterweigh. Ore is still hoisted to surface. The energy required to do that is not reduced by the counterweigh. Counterweigh is there to reduce required...
  11. capliard

    Fan Heat Gain

    In a Mining Environnement, All work (excluding work done against gravity) translates to Heat Gain. And for fans, yes, the mesured electric power at fan input will ALL be translated to heat. Ingenieur Minier. QuTbec, Canada.
  12. capliard

    Field Manutention of Concrete Slabs

    Thank you all for the great input. SlideRule, finaly I do not need the upper rebar Mat. But i had not realized i might need it. Ingenieur Minier. QuTbec, Canada.
  13. capliard

    Field Manutention of Concrete Slabs

    Hi everyone, I designed a slab for a mine closure application. To prevent workers from working above an open raise, Slabs are to be poured on the ground, then lifted and placed on a fill raise. The operations proposed a modification. The idea is to install styrofoam prior to pour. Upon cure...
  14. capliard

    Room Pressurization

    Pressure difference can be seen as resistance to flow. Your air flow will need to ''lose'' 5Pa of head to exit room. Not very much pressure needed at 5Pa. Have fresh air ducted to the room, put exhaust behind wall (Corridor, other room, wherever you want) Put adjustable vent traps in upper part...
  15. capliard

    VENTILATION SYSTEM FOR FOOD PROCESSING UNIT

    Ponctual source of emission is to be controlled by having exhaust very close to it. That's a Mantra! As Compositepro said, have a hood over it that will suck the hot air out. Ingenieur Minier. QuTbec, Canada.
  16. capliard

    Slurry Density with Cyclones

    Hey Daine, One way to overcome problem is to use sedimentation process to separate material size. It will work better in base metal mine where the grind is coarser. Gold mines tend to grind very fine and little sedimentation will occur early, so not much beach deposition. Dykes will probably...
  17. capliard

    Calculating impact load on bridge railing of a Cat 797 mining truck

    Main risk is driver falling asleep. Have it really wide. And with really good lighting. I would agree on 4 to 5 truck width for a two way, 3 truck width for a one way bridge. You cannot stop such a truck at full speed. I strongly advise to have them slow down to manageable speeds. Rapidly...
  18. capliard

    Cooling an Electrical Room via Ventilation

    In mining, we bring the RH up to bring temperature down, check your air psychrometric charts. Link Air at 94F an 0% RH can be brought down down about 55F just by vaporizing water. If your air is saturated in water, you'll have to climatize to bring temperature down. Vaporizing water is the...
  19. capliard

    Heat rejected by fan gain

    If you do not want the air to be heated by the fan, set it up in a Pull configuration. Your building will then be in negative pressure, but *most of* the heat from the fan will be dissipated outside instead of inside your building. Otherwise, the fan will heat the builidng. *Most of* because...
  20. capliard

    Explaination of Same size Fan RPM with different Air Flow and Static Pressure

    The customer needs to know those fans at their above-stated point of operation do not deliver the same air power. For B delivers about 30% less air at same pressure. Those fans cannot be exactly the same. They can look the same but aren't. Ingenieur Minier. QuTbec, Canada.

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