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  1. Chairs

    Pipe Flow Rate

    To make it clearer we can use an outlet of 0 psig. The only specifics to the question are there is an inlet pressure and a pipe full of water. Solve for the flow rate. I choose the outlet pressure and length arbitrarily.
  2. Chairs

    Pipe Flow Rate

    wouldn't it be 110 times the cross sectional area of the pipe? And it's really that simple? And 77JQX can you explain that a little more?
  3. Chairs

    Pipe Flow Rate

    Ok, thanks for the help but I ran into another problem. I used Darcy-Weisbach's equation, guessed a velocity, solved for Reynold's number, got the friction factor and then solved for the pressure drop. My plan was to do multiple iterations until my deltaP equaled 95.3 psi. (110psi - 14.7psi, My...
  4. Chairs

    Pipe Flow Rate

    I feel like this should be easy but I'm having a good amount of trouble figuring it out. I'm given the inlet pressure, the length and the inner diameter of the hose and I'm asked to find out the flow rate coming out. I'm also assuming the outlet pressure is atmospheric. Without being given a...
  5. Chairs

    Cryogenic Swivel Joint

    Compositepro can you elaborate on what you mean by using a spiral of tubing? And why is it better than a V-ring Style seal? Media: Liquid Natural Gas Pressure: I'm assuming less than 150 psi This is not a rotary, it is not made for constant rotation. Acceptable Leakage: This is one of my...
  6. Chairs

    Cryogenic Swivel Joint

    I'm looking into designing a swivel joint for cryogenic applications (33 K >). I'm assuming I'll use 316 SS for the body, PCTFE or something similar for the seals, and a low temp grease. Does anyone have any recommendation on what materials work best? Are there any special requirements for...
  7. Chairs

    Flow Rate through Smooth Bore Hose

    You're right I did do that. How do you calculate the Darcy's Friction factor if you don't have the velocity?
  8. Chairs

    Flow Rate through Smooth Bore Hose

    Ok this is the calculation I used but I'm getting a different answer. Is this approach correct? Darcy - Weisbach deltaP = Df * (Length/Diameter) * ((Density * Velocity^2)/2) deltaP = 250 - 14.7 psi = 33,883.2 psf Df=.0018 (Darcy Friction Factor for smooth bore rubber) Length = 100 ft Diameter...
  9. Chairs

    Flow Rate through Smooth Bore Hose

    Thanks I appreciate the help. I'm a new engineer (and the only one in my division); that being said your solution makes a lot of sense and I dont know why it never occurred to me. I started reading Crane 410 but it looks like it'll take me a while to get through it so this method will definitely...
  10. Chairs

    Flow Rate through Smooth Bore Hose

    I looked at the Darcy–Weisbach, I figured if I could solve for the velocity then from there the flow rate would be easy. The problem was finding the head loss. And I'm just trying to figure out the basic formula without fittings right now
  11. Chairs

    Flow Rate through Smooth Bore Hose

    Its water under normal conditions (70F). And to make it simple we can assume its straight.
  12. Chairs

    Flow Rate through Smooth Bore Hose

    I assumed this was easy but I'm having difficulty finding the right equation. I need to calculate the flow rate in GPM of a smooth bore hose. The diameter is 3/8", length is 100 ft, inlet pressure is 250 psi and outlet is atmospheric (14.7 psi). The rest is unknown
  13. Chairs

    Calculating Tensile Strength

    Yeah we already have a load cell in mind. I just wanted to calculate the tensile strength with the gauge pressure first to see how close it is to what its rated for before we go ahead and spend the money. Is there a fairly accurate way to calculate it?
  14. Chairs

    Calculating Tensile Strength

    We are using a 100 ton Ram to break steel cables. How would you calculate the tensile strength of the Cable using only the gauge pressure? I'm also having a problem because it seems that the pressure required to simply move the Ram is adding to the pressure required to break the cable. Does that...
  15. Chairs

    Help on Punch Press Ergonomics

    They have to be about eye level in order to feed the cable in correctly meaning if I raised the operator so his knees weren't bent as far I'd have to raise the machine too. I thought about building a stand for it and using something like that or just have the operator stand but I wanted to see...
  16. Chairs

    Help on Punch Press Ergonomics

    Here is a picture of the problem. The two metal plates are shown by the right facing red arrowshttp://files.engineering.com/getfile.aspx?folder=eb8cf641-06a2-4e6f-a8cd-6ff7af69f5ea&file=Untitled.png
  17. Chairs

    Help on Punch Press Ergonomics

    We are using a punch press and there have been complaints about the comfort for the operator. The operator sits at a chair and actuates the machine with a foot pedal. The problem is there are two solid steel plates attached to the machine that limits the operators leg space. Its uncomfortable...
  18. Chairs

    Flow Rate through Convoluted vs Smooth Bore Hose

    Can someone explain the difference in flow rates and pressure differences between convoluted and smooth bore hoses? Smooth bore is pretty straight forward but I'm having trouble finding information about convoluted hoses. I assume there would be a pressure drop and a non uniform flow but I can't...

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