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  • Users: jerfy
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  1. jerfy

    4" Hose Support System

    tbulena: We are not specifically limited but I had considered the longer hose, the more bend. My initial design was something 12-15 feet based on no hose stiffness data. We can extend the hose, but we are offloading biodiesel, and the biodiesel compatible Teflon hoses get expensive fast. Also...
  2. jerfy

    4" Hose Support System

    https://res.cloudinary.com/engineering-com/image/upload/v1438357735/tips/FaunaOffloadSketch_m9ms9d.pdf I have uploaded 2 more sketches both from top down viewpoint. They are out of order but the 2nd sketch shows our current system with offloading arm. It is hard to connect to the truck unless...
  3. jerfy

    4" Hose Support System

    Several distributors have also commented on the stiffness of the hose. As stated, we're replacing a pipe and need the flexibility for exactly the reason tbuelna mentions, for easily aligning the two fittings. Would there even be a noticeable difference in flexibility between the pipe and the 4"...
  4. jerfy

    4" Hose Support System

    https://res.cloudinary.com/engineering-com/image/upload/v1438268897/tips/HoseDrawing_byaxly.pdf Thanks again, Here is the sketch. The issue lies in the 12' support system we want to bury in the ground. The only part moved by the driver is the hose-truck connection, which is where we place the...
  5. jerfy

    4" Hose Support System

    Thanks a bunch, I researched "festoons" and made a few calls to distributors who confirmed my initial suspicion that festoons won't support the size hose we need (4 inch diameter). As stated, it seems these are for more flexible hoses. So, I am back to the drawing board. If a 4 inch hose is...
  6. jerfy

    4" Hose Support System

    Hello, I am trying to replace a stiff arm we use to offload fuel from a truck with a hose system for flexibility reasons. The arm currently supports itself, meaning the drivers don't do much lifting of the arm, just swiveling. I expect this hose to be rather heavy at any given time and don't...
  7. jerfy

    Understanding pump curves

    Thanks, I have been reviewing this resource all morning to begin piecing together my equation. Our butane tanks are pressurized to maintain liquid state. I'm wondering if this pressure is contributing to the suction head? I would imagine so, and that this is the "gauged head" but want to...
  8. jerfy

    Optimal butane pressure-flow diagram help

    Thanks for the continued help, Let me back up a couple of steps. I have been doing some research on pumps and head due to this issue but I am no expert. We have a manufacturer provided pump curve for our pump (corrected for butane) but I think I should create one for our pump from empirical...
  9. jerfy

    Understanding pump curves

    Thank you all very much, Sorry if I am confusing, I am fairly new to the workforce and pump engineering is not what I studied. I think I see where my misunderstanding lied, between understanding static and dynamic head. Now I am wondering how exactly I can put together a pump curve for our...
  10. jerfy

    Understanding pump curves

    Thanks bmir, perhaps I was not clear in my question. Our butane tanks are uphill and our pump is downhill pumping into an even further downhill line. If you view the attached pump curve, let's say we want 150 GPM from a 5 stage 40 HP pump. The curve says we can overcome 600 ft of butane fluid...
  11. jerfy

    Understanding pump curves

    https://res.cloudinary.com/engineering-com/image/upload/v1434655147/tips/VFD_Pump_curve_xoyddk.pdf Goodafternoon, I am hoping to get a better understanding on pumps and what exactly the manufacturer curves tell me. I don't understand why the attached butane pump curve seems to imply that...
  12. jerfy

    Optimal butane pressure-flow diagram help

    Thanks TD2K and MortenA, I have discovered that the problem doesn't lie exactly where I thought it did so let me restate my problem and hopefully you can help. We have a system which injects butane into a gasoline stream. We have a VFD that maintains our pump pressure as our supply tanks drain...
  13. jerfy

    Optimal butane pressure-flow diagram help

    Specifically, I am trying to maximize flow rate. However, our system has been flashing butane as it is injected from our smaller butane pipe into a larger gasoline pipe. I want to maximize the rate but need the pressure drop minimized to prevent this flashing. Additionally, I've realized a...
  14. jerfy

    Optimal butane pressure-flow diagram help

    Goodafternoon, I am a young engineer new to this community so please tell me if I should post this in another forum topic. This seemed most applicable to pipe flow. I am working on a butane pipeline that is blending into gasoline. To tighten the blend, I theorize that there is some optimal...

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