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Recent content by Butchsc

  1. Butchsc

    Air Pressure in vertical pipe when water enters pipe and traps air inside of it

    There are two ways to solve this problem in my opinion. First if we treat air as an ideal gas, then PV=nRT and if we assume that the temperature does not vary significantly (air is in pipe so it should remain close to the same temperature), then P1V1 = P2V2. The pipe, as shown is 58 ft long and...
  2. Butchsc

    Air Pressure in vertical pipe when water enters pipe and traps air inside of it

    here is a sketch of the pipe...thanks for all your input..for some reason is is sideways sorry for that...more later thankshttp://files.engineering.com/getfile.aspx?folder=9b2d6bf4-e4d1-4989-99e0-f4646c63da07&file=pipe_sketch.pdf
  3. Butchsc

    Air Pressure in vertical pipe when water enters pipe and traps air inside of it

    A sketch would help but I do not have one I can post at this time...perhaps tonight In my mind D is the height of the water inside the pipe, the pipe has 58 ft of water over it and the top of the pipe is 58-41 = 17 ft below the surface. Another way to look at this is that the pressure in the...
  4. Butchsc

    Air Pressure in vertical pipe when water enters pipe and traps air inside of it

    I think you guys are close BIG INCH I am not sure your equation is completely correct if D in your equation is the Depth of the water in the pipe, then the air deptch would be 41-D, Vw = D*1639/41 and Va = (41-D)* 1639/41 LITTLE INCH I am not sure this is a valid equation If P1 = 1bara and SG...
  5. Butchsc

    Air Pressure in vertical pipe when water enters pipe and traps air inside of it

    I have a 6 ft diameter pipe that is sealed at the top (effectively air tight) that drains into a empty pond. The elevation change is 41 ft. The pipe is at a 45 degree angle and is about 58 ft long, the volume is 1639 cubic ft. When the pond fills with water, to a height of 58 ft (~25 psig)...
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