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Re: filling pressure

Posted By: SVP Neon Equipment
Date: Tuesday, 30 April 2013, at 10:59 a.m.

In Response To: Re: filling pressure (john anderson)

Don't get your underwear all bunched up, John. I didn't say it was your researched data. I was merely responding to what George said, quoting what you said.

I would imagine your method will screw up transformer loading though.

Mark
.

> Never claimed the data in this chart was
> "mine", and certainly not that
> anyone else's method was inferior. I didn't
> come up with the research behind it, the
> European Sign Association did almost 20
> years ago.

> The main factor affecting the best fill
> pressure is total tube volume. Volume
> changes with diameter, but it changes even
> more with length in the typical neon tube.
> I'm not sure why the old US charts stuck
> with only measuring one of the parameters
> and not the other. I guess they didn't want
> to make it any more complicated. Same with
> Neon vs. Argon/Hg. the tubes operate
> differently and have different
> characteristics. Again, not my research.

> The original ESA chart lists all the lengths
> in CM. For example if the tube was from
> X-to-XX CM, fill it to this for the specific
> gas and diameter.

> All I did was categorize the various CM
> lengths into 4 categories: 1ft, 2ft, 3ft,
> 4ft. You pick the length that is closest to
> your particular tube. Sure, you could be
> more precise if you want to take out the map
> wheel for each tube. The formula for tube
> volume is simple. But applying these
> categories puts you much closer into the
> range that syncs with total tube volume.

> If you are curious how both diameter AND
> length affect tube volume, I'm attaching a
> link to a calculator you can scale in mm,
> ft, yards, etc. If you play around with it
> using typical neon unit lengths and
> diameters, you'll find length affects tube
> volume even more than diameter for most
> units.

> The goal in the chart I made (which again
> just converts units and summarizes the ESA
> chart and research)was to make something
> easier to use for US-based units (feet).
> Almost any pumper can look at a unit on the
> table and intuitively estimate whether the
> total footage is closest to 1ft, 2ft, 3ft,
> or 4+ ft... then quickly match it up with a
> fill pressure. With practice, I've even
> found I automatically extrapolate values for
> say a 1-1/2ft tube. Either way you are
> hitting the mark based on total volume
> better than something only based on
> diameter.

> This was my solution to making it easier to
> use in my own neon shop. If someone else has
> a better idea then by all means use that or
> whatever works best for you.
> John

Messages In This Thread

• filling pressure -- Bill's neon -- Friday, 26 April 2013, at 5:23 p.m.
  • Re: filling pressure -- Phantom Neon -- Friday, 26 April 2013, at 9:09 p.m.
    • Re: filling pressure -- SVP Neon Equipment -- Friday, 26 April 2013, at 10:38 p.m.
  • Re: filling pressure -- George Vidas -- Saturday, 27 April 2013, at 12:25 a.m.
    • Re: filling pressure -- SVP Neon Equipment -- Sunday, 28 April 2013, at 1:19 p.m.
      • Re: filling pressure -- john anderson -- Monday, 29 April 2013, at 3:27 p.m.
        • Re: filling pressure -- roger daniells C.R.Glow neon -- Monday, 29 April 2013, at 9:15 p.m.
        • Re: filling pressure -- SVP Neon Equipment -- Tuesday, 30 April 2013, at 10:59 a.m.
  • Re: filling pressure -- Bill's neon -- Wednesday, 1 May 2013, at 6:36 p.m.

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