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  1. parsec

    Variable Flow Pump Question...

    The required velocity in the piping to maintain the slurry is dependent on the particle size and weight. It is a balancing of drag (size) and gravitational (weight) forces. The vertical piping is where you will have the largest problem. That type of turn down (almost two to one) will be...
  2. parsec

    Check Valves Waterhammer Characteristics

    jdptx This sounds like an interesting publication. If possible, could you fax me a copy of it? Thanks Bob S. 315 349-1836 (Fax)
  3. parsec

    Locating Booster Pumps

    I agree that clearly the law of conservation of mass must be conserved. However, the premise that you have 4,000 bbh pumpped into the suction side of the exisitng system assumes that the main pump is capable of overcoming the pressure drop on the discharge side. If it is not, the pump simply...
  4. parsec

    Locating Booster Pumps

    A booster pumps discharge pressure adds directly to the main pump discharge pressure (just as the pump TDH is in addition to the pump suction pressure) . There are typically two main considerations when locating a booster pump in an existing piping system. Both consideartions are based on the...
  5. parsec

    Size of pipe to achieve required flow rate?

    Simon I reread your question and I think I now understand more clearly. You brine header is at 2 Bar which can be assumed constant. That means forget about the pump curve. I initially thought your mixing tank was at 2 Bar. Well, if there is sufficient capacity in your header, and it appears...
  6. parsec

    54" Mystery Flange

    B16.47 did not come about until after 1980. It did incorporate dimensions form some of the older codes, such as MSS-SP-44 and API 605. The reason was that back in the time when your plant was commisioned, there was little standardization in flanges of that size. It is a definite possibility...
  7. parsec

    Help: Flow in parallel pipe formulas

    Actually, it appears as though you have four unknowns. The three flows (Q1,Q2,Q3) and the common head at the junction, call it h1. Note that the lines probably do not connect at the end otherwise the elevations would be immaterial. Fortunately, you have four equations namely: Q1^2/2g*K1=h1-0...
  8. parsec

    Size of pipe to achieve required flow rate?

    Sounds like you need a good fluids reference. Probably Crane Tech Paper 410 or Cameron Hydraulics would be a good place to start. You are on the right track. Since your system is pump fed, you also need the characteristic curve of the pump. Actual data is helpful, but you need to know how...
  9. parsec

    Swing Check Valve

    A swing check in air flow is probably not the best application. It requires more flow to keep open. A nozzle check or dual plate are more appropriate for air flow (not that a swing check won't work but it must be carefully chosen). Also, dual plate designs offer less resistance than most...
  10. parsec

    Check Valves Waterhammer Characteristics

    Try "Dynamic Testing of Check Valves" William Rahmeyer www.engineering.esu.edu/Departments/cee/faculty/rahm/check.html Also, there was some fundamental research doone in this area by Delft Laboratories (Netherlands) which I am also trying to find a copy of. The best way (only way...

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