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  1. chogben

    Drop Box Design

    Hello Backfill, The service is a tailings line from a molybdenum flotation circuit. P80=275 micron 37% solids by weight SGmixture = 1.37 SGsolids=2.6 2300 cu.m/h approximately 33% fines Carrier - water The slurry is pumped from a pump box over a haul road to run along a flat pipe bed. Once...
  2. chogben

    Drop Box Design

    Hello, I am looking for references on the design of drop boxes. Guide lines for diameter depth of pool and erosion issues. Does anybody have any experience with drop boxes?
  3. chogben

    Slurry Pipeline Design Using Slysel

    Stanier, I have used Slysel once, but I wouldn't say I'm familiar with it. I've been collecting information on the theory behind the software to better understand it's output. I would support a forum as you have proposed.
  4. chogben

    Pressure drop for Slurries

    bulkhandling, do you have a link or contact for the Enviro-tech Slurry Manual? I have some of the GIW information that uses the D'Arcy friction factor and would be interested in seeing a presentation of slurry piping using the Hazen-Willams formula. Regards
  5. chogben

    Pressure drop for Slurries

    Stainer, thanks for the recommendations, and the caution about the math! I have a good starting point with all of the recommendations. All I need to do now is convice others in the office that there is more out there than Hazen-Willams for slurry flow. Regards,
  6. chogben

    Pressure drop for Slurries

    Thanks for the advice! I have read through some of "Slurry Transport Using Centrifugal Pumps" and concluded myself that H-W wasn't the best fit, but there are those who are wiser with a few more grey hairs that have experience with H-W in the office and prefer it to other techniques. Cheers
  7. chogben

    Pressure drop for Slurries

    Greetings, I'm interested in some feedback on methods people have used to determine friction loss in slurry piping. The applications have ore from -28 mm to +1.5 mm with a specific gravity of 2.5 and a dense medium for separation with a d50 of approximately 30 microns and a specific gravity of...
  8. chogben

    Caesar II with Tie-rod Ex-joint

    T5580, You may need to relocate your expansion joint, or modify the piping layout. If you use a rigid Y then there will be no pressure thrust from the expansion joint since the rods take the loads, but the expansion joint will not compress. If you allow the joint to compress then the pressure...
  9. chogben

    Expansion loop for Steam Line

    StoneCold, Use the Guided Cantilever beam equations to determine the length of straight pipe required to absorb the thermal growth for a given allowable stress. Then set the width of the loop to 1/5 of the length and the height equal to twice the width. The Piping Handbook, Anvil's Pipe...
  10. chogben

    Grinnell's book

    The book can be ordered from Anvil for $100 or maybe you can talk a sales rep into a freebie. http://www.anvilint.com/literature/Design.html
  11. chogben

    Safety Valve vent stack sizing

    SooCS I have not read API RP 521. My employer doesn't deal with API specifications often so they are not kept up to date. davefitz Do you know why the B31.1 App II did not include the min. back pressure correlation that Liao has? Perhaps it was covered in the B31.1 equation for the chocking...
  12. chogben

    Safety Valve vent stack sizing

    Greetings, Does anybody have recommendations on techniques for sizing vent stacks on PSV discharge stacks; open or closed. I am familiar with the techniques of Benjamin, Liao, B31.1, and Miller of the BHRA. Has anybody experience blowback on vents sized with any of the above techniques? Chris

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