pneumatic Offload questions Sand/salt

Discussion in 'Tanker, Bulk and Dump Trucking Forum' started by All-American82, Jun 28, 2020.

  1. All-American82

    All-American82 Light Load Member

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    Spanish Fort, AL.
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    HELP!!! I need some advice from EXPERIENCED drivers who have delivered sand and salt.
    I started a new position with a pneumatic dry bulk company back in February. I have BEEN doing cement and fly ash with no MAJOR issues.
    However, I was offered a position in the company for more money and a new truck doing sand and salt.
    The "trainer" I went with was pretty good at explaining and teaching the in's and out's. But, my question has to do with offloading. We went to a place that had an APPROXIMATE 400 ft run. There were 5 90' turns that I could see. and the pipe went straight up the side of the silo for AT LEAST 300 FT. He had the RPMs at 1250, full air and aeration and was maintaining a pressure of 12-13 lbs. But it took over 3 HOURS to offload. :(:(:( Now when we got there, the operators comment to me was, "blow at 8lbs or you'll be here all day". Now, being in "training" I have to do what my "trainer" says. But, 3 + HOURS seems really excessive to me to offload. But, with my trainer, I really couldn't experiment to much. We had NO issues and did NOT plug up, so all-in-all, everything went smoothly. It just took forever(?) to offload. Would you experienced guys, given the scenario, consider this "normal"?

    Now, at this point I should let you know that I have 6+ years experience on the Liquid Bulk side (HAZMAT) so I am VERY familiar with maintaining pressures and long/short runs and adjusting as necessary. And I have NEVER spent anywhere near that amount of time to offload UNLESS there was some issue.

    Now, the SECOND day we went to deliver sand. Now these were small tanks and the runs were MAYBE 50 ft. Literally out the trailer, our 20ft hose and into the tank which were MAYBE twice as high as the trailer. But, he's running the RPM's at 1250, full line air and aeration, and again 12-13 lbs pressure. And it's blowing dust out the tank vent everywhere. Now the operator DID NOT seem concerned, but that RPMs seemed excessive to me considering the short run. And blowing the dust everywhere???? AND one of the tanks had the spout above the tank, so you could actually SEE the product going into the tank. and it looked like to ME that it was about 90% air. It looked like we were moving more air than product.
    ANYHOW, considering the WEIGHT of both these products and the "runs", does this seem "normal" to you experienced guys???
    I go on my own on Monday, So I will be playing around with things, BUT???
    Please let me know what you think or any usefull suggestions?

    Thanks!
     
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  3. REO6205

    REO6205 Trucker Forum STAFF Staff Member

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    We haul most cement, ammonium nitrate and lime but we occasionally haul salt and sand.
    The time for your salt unload, given the twists and turns in the plumbing, doesn't seem unreasonable. By your own words, the offload went well with no plugging.
    Being a new driver, why not just follow your trainer's example and see how things work out?
    After you've been there awhile and hauled more of those loads and talked to other drivers you'll have a better idea of how or if you can shorten your unload times,
    Same thing with the sand.

    PS...on the salt. If you ever plug up a load of salt, especially rock salt, you'll remember the experience for a long time. I know that for a fact.
     
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  4. Roberts450

    Roberts450 Road Train Member

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    Ive done a couple loads of sand a few years ago but I don’t remember using the aerators for it. The top air and mainline’s where wide open and then maintained the pressure with adjusting product valve.
     
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  5. andre

    andre Medium Load Member

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    Jacksonville, FL
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    i would not consider either of these unreasonable.

    the second delivery, well, i will say that when unloading sand, you will be blowing mostly air. i had an occasional bottom ash delivery up into the three boilers at a power plant. it is basically sand. the piping "runs" are as you described. 90 degree turns, hundreds of feet straight up into the belly of the beast. on boiler B, i could not run past 5 or 6 psi without drastically increasing the chance of getting stopped up. one boiler took 2.5 hours to unload into. one boiler took 4 hours to unload into. one boiler took 6 to 8 hours to unload into, and you had to elevate sections of your piping so that it was in kind of a wave pattern.

    the thing to do is.. when you get out on your own, try it your way. see what happens, how fast the tank empties. mark it down. if you are somewhat of an expert in pumping and can always reverse pump and unstop your line, whats the harm in experimenting? you lose some time and gain some knowledge.
     
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  6. All-American82

    All-American82 Light Load Member

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    Spanish Fort, AL.
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    Thanks Guys!!!
    That's what I was trying to find out. If the "times" are Normal, then I'll just play a little and make sure everything stays flowing and go about my day

    Thanks!!!
     
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  7. wis bang

    wis bang Road Train Member

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    8lbs or you will be here all day....under 8 you will plug and over 8 you may be fighting storage tank vents clogged with corrosion from the salt -or- crystallization of the salt built up inside the vent so over 8 lbs you are pushing against back pressure...
     
  8. Long FLD

    Long FLD Road Train Member

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    I’ve never hauled sand, but we had many salt places that were in the 2-3 hour range because of how they were set up.
     
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  9. wis bang

    wis bang Road Train Member

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    think about it, with liquids every 90 degree turn cuts the speed in half.....flowables are solids acting like liquids
     
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  10. Long FLD

    Long FLD Road Train Member

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    And salt wants to lay on the bottom of the pipe on any flat sections.
     
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  11. REO6205

    REO6205 Trucker Forum STAFF Staff Member

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    We haul rock salt. Depending on the moisture content it can plug up in a heart beat. The worst we had was a load that sat in the trailer over a humid weekend and it turned into basically a 50000 lb lump. We ran the vibrators and beat the crap out of the trailer with rubber mallets for the whole unload. We also shut down every half hour or so, depressurized, and poked lengths of rebar into the load to break it up. Took about five hours on a load that usually took two and wore three men right down to a nub. Luckily it had a short hose run with only one 45 degree bend.
    Now, if we can't unload it the same day we pick it up we don't mess with it.
    Does granular salt do the same thing? Does it plug easy?
     
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