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  1. Docseven

    Driving fluid from tank to piping system

    Thanks very much latexman. I was able to come up with similar results when I switched to Darcy Q=19.64 d^2 sqrt(hl/K) and used approx 20 ft (10 psig+10 ft head in tank initial condition) as hl, along with an entrance loss (k=.5) and straight pipe run (2.8 or .88 for 3/4" and 2" respectively) and...
  2. Docseven

    Driving fluid from tank to piping system

    I am going to post a third and correct drawing this time! It is an 8 ft length of 2" pipe (and 2nd scenario is going to be 3/4" pipe) and I have finally properly labeled p1 and p2.http://files.engineering.com/getfile.aspx?folder=294956ce-641f-478c-a6fe-204557e5b1b8&file=expn_fill.jpg
  3. Docseven

    Driving fluid from tank to piping system

    The 100 feet static head will not change appreciably during this evolution due to the volumes of the two systems (few thousand vs 100K gallons). I did have a mislabel on the original drawing but it isn't the way you marked it up. For the sake of this initial go at the problem (calculate time...
  4. Docseven

    Driving fluid from tank to piping system

    I have tried a number of equations and keep getting drastically different results. With liquid water (say 15C) in a tank connected to a system open to atmosphere with 100 feet of head via an 8 foot section of 2" pipe, if the tank is pressurized with air in order to drive the tank water into the...
  5. Docseven

    Combining Water Streams

    The current flow of 190 gpm @ 20 psig before going to the standpipe is measured with a gauge and flow meter for the treatment plant. The flow through the additional filtration system is coming into that system at 75 PSIG off a header maintained at that pressure. There is a flow meter on the...
  6. Docseven

    Combining Water Streams

    Hello, I am getting tripped up on this application. An outlet of a water filtration system is currently flowing with a pressure gauge on the outlet reading 20 PSIG, at 190 GPM, through additional piping (I have geometry and can work out friction factor impact as applicable) and empties at the...
  7. Docseven

    Hydrogen Generator (Proton Exchange Membrane) Cooling

    Hello all, I am wondering why the plant's hydrogen generator requires cooling on both the anode and cathode side of the reaction. Are both sides, where Water molecules split and O2 and H+ ions are formed, and the other side where H+ ions combine to form H2, net exothermic? Data I can find on...
  8. Docseven

    NFPA 54, 56 ... Purging and Inerting

    Hello all, NFPA 54 section 8.3.2 has a table showing which pipes need to be purged into and out of service, ie if it is a 3" pipe that is greater than 30 feet in length. NFPA 56 does not have a similar table. I am at a new facility under construction. May this facility once operational by the...
  9. Docseven

    ASME B31, natural gas piping repairs

    Hello all, I am in an engineering position at a power plant at which I am very new. I have not been involved with codes, etc in prior positions (more performance engineering work in prior work history). Right now I am working with a group developing a corporate procedure for natural gas...

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