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Converting Engineer's Metric Pipe Model to Imperial

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    Converting Engineer's Metric Pipe Model to Imperial

    Anyone had any luck making this conversion from metric pipes to imperial? Ductwork is fine as we fab sheet metal to any units but piping is a problem.

    #2
    Mostly you will need to ensure that you go through and change the Nominal Diameter settings for each pipe material that is used (Manage>MEP Settings>Pipe Segments and Sizes). The physical dimensions of the pipes should be correct since they are defined separately than the nominal sizes. In my experience converting between units only messes up connections to equipment/fixtures (Revit will create transitions and will probably give you warnings about segment sizes not matching IIRC)

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      #3
      Originally posted by evan.dodds View Post
      ...The physical dimensions of the pipes should be correct since they are defined separately than the nominal sizes...
      When I load Sysque's metric versions of their fittings it takes on the soft metric number as a hard dimension. So the fittings are actually smaller.

      Originally posted by evan.dodds View Post
      ...In my experience converting between units only messes up connections to equipment/fixtures (Revit will create transitions and will probably give you warnings about segment sizes not matching IIRC)
      Good point. I would have to create an equioment/fixture/terminal schedule showing all connection sizes and adjust them there. I hope they all show up...never done that before.

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        #4
        I've never really cared about my pipe fittings being 100% correct so I didn't notice that they are definitely affected too..... you can change the routing preferences to the imperial fittings then use the 'reapply type' function. But that happens on a system-by-system (think DCW-1, DCW-2,...) basis, which could be/is tedious.

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          #5
          Originally posted by evan.dodds View Post
          I've never really cared about my pipe fittings being 100% correct so I didn't notice that they are definitely affected too..... you can change the routing preferences to the imperial fittings then use the 'reapply type' function. But that happens on a system-by-system (think DCW-1, DCW-2,...) basis, which could be/is tedious.
          Thanks for that tip Evan. I will look at these issues a bit more closely.

          My work involves coordination and prefab so it's part of my core practice to use proper fittings for duct and pipe. The whole design-build arena involves the eventual passing of the model from consultant to contractor with minimal loss of information and time. At the top of my wishlist aside from tools and automation is for consultants to use imperial pipe so that someone like me can work in a setting that has all the necessary preconditions for detailed prefabs. I may not prefab all of it, but when I do, it should be painless. This applies to equipment. Pipe connections should be imperial with the option to report the soft metric number that merely corresponds (rather than controls) the actual imperial nominal diameter.

          A whole meeting about this came up just the other day and one of the PMs said something to the effect of, "but it's only because of the U.S.", and I replied that all manufacturers worldwide are set to imperial so we're never going to change units for pipe.

          In hindsight though, I should have added that even if the world of pipe manufacturing did change units, it's easier to switch your Revit template at that time rather than mess with this on every current job.

          In Canada, architects insist on metric units of measure for distance and diameter. But they give heating/cooling capacities a pass with MBH, tons, etc on the drawings. Air pressure is reported in Pa and kPa. Maybe I dont know enough about the reasons behind it all, but it all seems so arbitrary. I do think it's manufacturer driven because gas heaters are spec'd in MBH but electric heaters are in kW regardless of the architectural preference. I dont mind dimensioning distances in mm, but why not let the pipes be called out in inches? It's a manufacturer driven parameter that also allows the consultant/contractor handoff flow so much smoother.

          Sent from my SM-N920W8 using Tapatalk

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            #6
            Imperial complications? Ancient measures and 12 fingers are no match for a system of consistently scalable base 10 units at your side...

            You could also import your own imperial pipe types, with imperial fittings, select a pipe run and do Change Type.

            Originally posted by koolair View Post
            .. all manufacturers worldwide are set to imperial so we're never going to change units for pipe.
            Not in Europe, everything is manufactured in mm. The only exception is some pipes for specific uses like sprinklers that are quoted in inches (I think only because some clients want designs to NFPA fire regs). So we use metric template and have to tag those pipes manually with " diameters.

            I wish the US (And Myanmar or Liberia) would stop keeping our retarded victorian system going..
            "One must imagine Sisyphus happy." Albert Camus - "The innovator has for enemies all those who have done well under the old conditions, and lukewarm defenders in those who may ​do well under the new." Nicolo Machiavelli -"Things that are too complex are not useful, Things that are useful are simple." Mikhail Kalashnikov

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