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  1. simplemath2

    ASTM/AWWA Type pipe material used in AWWA water tank

    Pretty good size of pipe inside AWWA water tank serve to diffuse and minimize mixing. Size is 30" to 40". tank is 40ft and atm pressure. So max pressure pipe will see is hydraulic head by assuming no water hammer load. Water will diffuse at close to working level so pipe will be riser close to...
  2. simplemath2

    Drain pipe design

    I am assigned to design a spill way for LNG tank. It is to drain LNG in case flange failure. While sizing the vertical drain piping, I was told to use self-venting design which limites froude # <0.3. My questions are: 1. If design for full flow(froude # =0.8), is it acceptable? what bad will...
  3. simplemath2

    centrifugal fan manufacturers

    Does someone has a few names of top centrifugal fan manufacturers in the united states? We need fan could deliver 70,000CFM at 0.6PSI back pressure to be more specific. Thanks in advance.
  4. simplemath2

    Mathcad X-y ploy

    Two difficulties I encountered when using mathcad in x-y plot : 1. I found no way to draw a vertical line say x=4. 2. I found no way to place two set of data in same graph (ie, two dataset with same x range, but different intervals) Any ideas? Thanks.
  5. simplemath2

    Solar radiation heat transfer on building

    I would like your support for the following problem: My task is to evaluate heat gain from environment to a cooling storage tank in the summertime. Two questions I have are: 1. Unit area solar radiation. Is there a map or similar to find the max unit area solar radiation at a location? I...
  6. simplemath2

    Steam Distribution Piping

    I would like your support for the following problem: My two questions are regarding aboveground outdoor steam distribution piping approximately 2km in length. Pressure is 17.5bar. 1. Between B31.3 and B31.1, which one will be the best design code? 2. In pressure loss calculation, crane fluid...
  7. simplemath2

    PVC or PE pipe for water distribution inside a container

    I would like your support for the following problem: I tried to decide the plastic piping material for inside container water distribution. Pipe size : 18in to 30in Medium: water for Cooling /Firefighting Temperature: 40 -55 F Pipe with radial slots (every 5in) to evenly distribute water to...
  8. simplemath2

    B31.3 and Cross weld

    To me it seemed that B31.3 has no control on cross weld, nor recommends seam stagger spacing, while such requirements are in ASME VIII , PIP and AWS code. Is there some space that B31.3 refer to other codes so that no need specifically say that? Regards SiMa
  9. simplemath2

    Passive cooling of foundation

    The design employs hollow duct in the foundation. They are supposed to take away heat by natural convection to keep foundation cool if pressure vessel on top of is hot(350F). The ducts are placed horizontally through the foundation. In this way , I am doubting how natural convection can develop...
  10. simplemath2

    why flanged gate valve?

    In one of refinery revamp , both hot air and steam service, the piping spec calls out valves 3" and above with no exception flanged gate valve. The service is 500F - 800 F and 40 psi. Class 150. I wondered. I am thinking of butt-weld would be superior to flange considering from weight, leak...

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