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  • Users: DGStavlas
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  1. DGStavlas

    Flotation reagents preparation

    We are currently upgrading a flotation reagents preparation system which involves SIPX,Copper sulphate,sodium cyanide & lime. As I have read a typical system would include a mixing tank & a holding tank. Currently our client doesn't have a holding tank and uses two tanks that operate as mixing...
  2. DGStavlas

    Check valve type for VFD controlled pumps

    Dear all, We are looking for the suitable type of a check valve to be installed at the discharge line of a VFD controlled pump. Our first thought was to use typical swing check valves but as I have read in some posts herein a lot of colleagues suggest the use of non slam check valves (e.g noreva...
  3. DGStavlas

    B16.5 Flanged fittings

    Hi all, My customer requests to design its pumping station connections with rubber lined flanged fittings. Though the flanged fittings in accordance with B16.5 are tabulated and dimensions are given I don't know whether there are suppliers that fabricate them. The other solution I was thinking...
  4. DGStavlas

    Swing Check Valve transient modelling

    Dear all for rough modelling purposes I'm looking the following info regarding a 12" class 300 swing check valve: -Cv value or Cv % vs time chart. I can only find from datasheets a single Cv value but the software needs a chart Cv vs Time something like that: Time(sec) Cv 0...
  5. DGStavlas

    Rubber lined piping

    Dear all, This is the first time I'm involved with rubber lined piping so probably I'm looking for the fundamentals.I have the following questions. -Rubber lined flanged fittings can be made of B16.9 fittings and B16.5 slip-on raised flanges ? -Flanged joints need gaskets ? -Regarding lining...
  6. DGStavlas

    FluidFlow3 or AFT

    Dear all, I am in the process of selecting a pipe flow analysis software for the firm I work for and have narrowed down to FluidFlow3 or AFT. I was wondering if anyone has personal experience in both that could offer an opinion on the drawbacks of either software. Any help is appreciated, even...
  7. DGStavlas

    Steel for pressure vessel

    I would like some help regarding metal sheet specs for the design of a pressure vessel. The specs are the following : Steel EN10028-3 Tolerances acc. to EN 10029 class B Surface condition EN10163-2 class B - subclass 3 Ultrasonic test EN10160 cat. S1,E1. The steel plates will be used for the...
  8. DGStavlas

    Mine shaft piping stress analysis

    The consulting firm I work for acquired a contract for the reconstruction of an underground mine pumping station. Because we are a small company we asked for the help of a piping stress analysis specialist. Although I don't know the subject so well so as to judge his work, I have some questions...
  9. DGStavlas

    Expansion Joint or pump connector

    I am a young engineer who's recently been assigned with the design of an underground mine dewatering pumping station. The pumping station consists of three horizontal multistage centrifugal pumps operating at Q=650m³/h & H=30 bar. The surge analyst calculated the maximum static pressure at the...

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