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Thread: Revit Formula to take gallons to lbf

  1. #1
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    Revit Formula to take gallons to lbf

    Trying to take an Expansion tanks shipping weight and then adding the water weight. Formula looked like this:

    Shipping Weight+(Volume*8.34 lbf)

    Shipping Weight is in lbf, Volume is in Gallons. Trying to use 8.34 lbs per gallon. I've tried it a couple of different ways and Revit either inserts a CF (FT3) or in-wg./100ft units into one of the numbers.

    I've tried the "Divide by 1" trick I've read about in these forums but I'm not having much success.

    Any help would be appreciated. Thanks!

  2. #2
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    This is why I use unitless numbers where I know I won't need units. My parameters for weight, temperature and expansion tank capacity are unitless so I can avoid "inconsistent units" errors when working with them.

  3. #3
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    Thanks for the reply. I understand where your coming from. However, I've used formula's with units in the past with great success. Just can't get this one and it seems so simple.

  4. #4
    Mr. Revit OpEd
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    How does the attached image look? I used a parameter to store the Water Weight parameter variable. I used Structural Discipline Weight parameter type for the weight parameters. I used the Volume parameter type for the volume.
    Attached Thumbnails Attached Thumbnails Revit Formula to take gallons to lbf-water.jpg  

  5. #5
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    Steve,

    Thank you for taking the time to look at this. I noticed the Volume Parameter was unitless. I'm hoping to keep this as a Piping Volume parameter in gallons. I'm planning on using this parameter in system volume calculations when sizing expansion tanks.

    Is the only way to make this work to have one of the parameters unitless?

    Again, thank you for your time.

  6. #6
    Mr. Revit OpEd
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    It isn't unitless...just the suffix option in Unit settings was set to none...see image.
    Attached Thumbnails Attached Thumbnails Revit Formula to take gallons to lbf-waterb.jpg  

  7. #7
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    Thank you Steve. Can you get the same equation to work when when the volume parameter is in gallons and not cubic feet? I tried and could not get it... Inconsistent Units. See Image.

    Attached Thumbnails Attached Thumbnails Revit Formula to take gallons to lbf-water.jpg  

  8. #8
    Mr. Revit OpEd
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    Okay here's another with that in mind - see attached
    Attached Thumbnails Attached Thumbnails Revit Formula to take gallons to lbf-calcs.jpg  

  9. #9
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    Steve,

    Thank you. That worked. However, when I inserted ".../ 1 gal)", Revit turned it into ".../0.13 CF)", Which is just 1 CF/7.48 gal. Same result. Weird that it had to change it into CF and not keep just 1 gal.

    Thank you for your help. I appreciate it.

    Dan

  10. #10
    Mr. Revit OpEd
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    Here's the family I made to work on it (no geometry).
    Attached Files Attached Files

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