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  1. Josh2008

    ANSI B17.1 Key Design

    Reference - Machinery's Handbook 28 Ed ANSI B17.1-1967 Why are rectangular keys preferred above 6 1/2" shaft diameters? (and square keys below) Is the key size versus shaft diameter table found in the Machinery's Handbook a recommendation only? I assume you just size the key based on common...
  2. Josh2008

    Shaft Design

    Good Afternoon, I'm designing a shaft for an oscillating steel gate on a inclined plane (40 deg). The gate is 6 ft wide by 12 ft in length and weights approximately 6500 lbs. The gate oscillates 46 degrees every 115 seconds at a rotational speed less than 5 rpm. It is actuated by two...
  3. Josh2008

    Combined Bearing Loading

    I have been told that you can use an axial and radial bearing side by side in place of a bearing that is designed for combined loading. Is this good engineering practice? Every time I think about the loading with bearings side by side, each meant for a particular load (radial or axial), I feel...
  4. Josh2008

    AFT Fathom Question

    Good Afternoon, I was wondering if anyone would be able to explain how I would model a simple circuit (attached picture) to calculate split flow in AFT. I don't know which icon is used to drain water to atmosphere. Can I simplify this in AFT or do I have to include a pump and reservoir, etc...
  5. Josh2008

    Low Speed Bearings

    I have an application that requires a maximum radial load of 44,000 lbf and a maximum axial load of 3,200 lbf (both factored). This is a low speed application (less than 5 rpm). The bearing only makes a 45 degree (1/8) rotation every 45 seconds. I thought roller and ball bearings are...
  6. Josh2008

    Heat Transfer Energy Balance

    If I have a container with hot water coming in and mixed water exiting at the same flow rate, what is the energy balance for the system. Tank 200 gal (0.76 m3) k = 235 W/mk surface area conducting heat = 4.98 m2 ambient air temp at 60F because the water temperature varies coming into the tank...
  7. Josh2008

    NPSHA

    Hi all, I have a couple pumping questions below. Is it necessary to check the available net positive suction head for a submerible pump that is designed to run dry? Is vapour pressure only a function of temperature? What about elevation? I have been working on pumps for underground...
  8. Josh2008

    Equivalent Length of Socket Welded Fittings

    I'm looking for equivalent lengths of socket welded fittings. Below I have found a pdf that is very useful, although it only contains butt welded fittings. http://www.westerndynamics.com/Download/friclossfittings.pdf Any sources or recommendations on what to use for straight pipe socket...
  9. Josh2008

    Dust Suppression Component Catalogues

    I'm looking for dust suppression ducting catalogues, as well as other dust suppression catalogues for various components (hoods, fans, etc). Please list common suppliers. Thanks, J
  10. Josh2008

    Heat Exchanger Basics

    Hi, Can anyone please provide a basic rundown on what information is typically provided to vendors when spec'ing a heat exchanger? -Type: Tube or Plate -Fluid Mediums: Fluid or Gas and what type -Heat Transfer Load -Temperatures incoming and outgoing for both mediums -Mass Flow Rates...
  11. Josh2008

    Soil Temperatures

    Not sure if I'm in the correct forum, but I'm looking for references, formulas, or documentation for soil temperatures with respect to geographical location, type of soil, depth, ambient temperature, etc. I have searched ASHRAE but no luck so far.
  12. Josh2008

    Wire Rope Ratings

    Hello all, I'm new to lifting and rigging, and I'm checking equipment spec'd out by a designer. A wire rope sling with an end looped and crimped by a swaging sleeve that passes through a shackle creates a very tight bend radius. Bend radius' reduce the strength of the wire rope. I have found...
  13. Josh2008

    Heat Trace

    I'm running some heat loss calculations for the selection of a heat tracing solution for water supply pipes. What is a safe minimum design temperature to maintain the water at? Last time I spoke with a manufacturer we discussed 3 deg C. Any comments? Obviously it has to be above 0C...
  14. Josh2008

    Conveyor System

    I'm looking to plot a system curve for a conveyor system (Torque vs RPM), similar to that of a pumping system (pressure vs. flowrate), so that I can send it off to verify that an electric motor can accelerate my system within my alotted time. I have been using Belt Analyst software, as well as...
  15. Josh2008

    ASHRAE 51.5

    Hi, I'm working on calculating the net cfm into an electrical room to prevent the ingress of dust and contaminents. I have used an equation that has been referenced in a number of threads (that is said to come from ASHRAE 51.5 1999). Threads http://www.eng-tips.com/viewthread.cfm?qid=62681...
  16. Josh2008

    Ontario Building Code Pipe Freeze Protection

    Appendix A-7.3.5.4.(1) of the 1997 Ontario Building Code (can't seem to find the same section in the new edition) covers calculations on freeze protection for burried water and sewage pipes. It notes FOAM INSULATION but does not state what material or R value it is supposed to be. Does anyone...
  17. Josh2008

    Dehumidifier

    If the outside maximum temperature is 104F / 84.5% rh and I want to reduce the relative humidity to 50% via a dehumidifier, what indoor temperature would I use? This is for an electrical room that produces about 100 kW (hrly avg) heat load. Is there a requirement for ACH? Once I know that I...
  18. Josh2008

    Suitable Dehumidifier

    I'm looking at sizing a industrial dehumidifier. First air from outside has to be conditioned (water vapour removed from the air) Other sources of Moisture = Infiltration, Permeation, Ventilaton and makeup air, door and window opensings, people, processes and products. Once the total lb/hr...
  19. Josh2008

    Shaft Design (Machinery Handbook)

    I heard somebody mention there is a "rule of thumb" for shaft turndown ratios mentioned in the machinery handbook. I cannot find the reference. Would somebody know of such a thing? Ex. Should not turndown a shaft more than 25% of its diameter, meaning a 4" diameter shaft should not reduce...
  20. Josh2008

    Cantilever Mount

    I don't know what or if any forums suit a product question, but I'll give it a shot. I'm looking to mount an obstruction light on a tall building. The light needs to be cantilevered out about 6 feet from the walkway (that runs around the building) on a swivel. The swivel is so that the arm...

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