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Recent content by 092961

  1. 092961

    Total Deadhead Pressure of Pumps Operating in Series

    Pumps are centrifugal. Feed is tank ~8-ft head. Line is 6" pipe. In a closed space, no flow, pressure should all be equal so what you're saying is the entire line is the sum of all pump heads at zero flow plus the 3.5-psi static pressure at suction to first pump? I've (very roughly) drawn...
  2. 092961

    Total Deadhead Pressure of Pumps Operating in Series

    I have two pumps operating in series to achieve a higher overall discharge pressure. If a valve on the discharge line is closed, both pumps will deadhead. My question is whether the net pressure in the piping downstream of the pumps (upstream of valve obviously) will be the sum of the deadhead...
  3. 092961

    ASME Section X - Metal Reinforced Vessel?

    This technology is used for pipelines and undergoes rigorous cycle and burst testing per ASTM D1598, D1599 and D2143. I don't have a concern for the ability of the vessel to withstand the pressure, but I do wonder whether ASME will "recognize" the vessel as falling under the jurisdiction of...
  4. 092961

    ASME Section X - Metal Reinforced Vessel?

    I am looking at using a metal strap reinforced FRP pipe in a pressure vessel application but need to qualify the vessel to ASME Section X code. Although as an FRP vessel I feel it should fall under the "jurisdiction" of Section X, the pipe has ductile metal (steel) straps imbedded in the FRP...
  5. 092961

    Part Quantities When Using "Stacked" Balloons

    The balloons refer to the BOM item number, however the BOM lists the total quantity whereas the balloons show the quantities of each part (or set of parts for stacked balloons) AT THAT LOCATION.
  6. 092961

    Part Quantities When Using "Stacked" Balloons

    When using stacked balloons that apply to multiple locations of parts on an assembly, is it more "accepted" to place the "2X" beside the first balloon with the assumption that the fabricator will understand that the quantity applies to all balloons in the stack OR place the "2X" beside every...
  7. 092961

    Seismic Loading

    I'm not a structural engineer, but I am involved in designing frame-mounted equipment that is sometimes installed in seismic zones. We recently purchased software called STAAD.pro to perform structural analysis including seismic loading. The problem is that, at least in California, the frame...
  8. 092961

    how to determine a pump's head and flow by examining the impeller?

    Be careful, performance is affected by many variables. Different types of impellers have different performance, for example a radial vane (Barske) impeller will give different performance than a backswept vane impeller. Open impellers perform differently than closed, etc. If you need accurate...
  9. 092961

    Piping Heat Loss in Closed Loop System

    Thanks for all the feedback...here are a few responses: Sailoday28: This is important to me...yes. Was that piping material mass*material specific heat (cp)*temperature rise(dT)? If so, I believe the light might be coming on! CRG: The 90% is not the hydraulic efficiency, it's the motor...
  10. 092961

    Piping Heat Loss in Closed Loop System

    I've got a system with a 7000 gal 316SS tank in a closed loop with 120 feet of 12 inch diameter 316SS piping. The system is located inside with ambient air temperature of 60 F. The water is heated in a separate heating tank to 110 F. The process cycle involves filling the 7000 gal tank with...
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