[conspire] pipes, imperials, and metrics [was Re: Watering automation: an edge case cautionary tale]

[Paul Zander]

> I really want to fire this reality and hire a metric one.The thing about this reality is that plumbers and plumbing suppliers all have a stock of parts that they are familiar with.  A new reality would cost them real $ to scrap the parts they have.

Actually it isn't all that different from a lot of software.  If we were to start from scratch we could do a better job, but we are force or encouraged or ... to use the legacy software that has been written and tested and debugged to some degree.  Except maybe Microsoft which just written sold.
      From: Tony Godshall <togo at of.net>
 To: Paul Zander <paulz at ieee.org> 
Cc: "conspire at linuxmafia.com" <conspire at linuxmafia.com>
 Sent: Monday, March 27, 2017 4:34 PM
 Subject: pipes, imperials, and metrics [was Re: [conspire] Watering automation: an edge case cautionary tale]
   
...
> 'Outer Diameter (OD)':  Means what one thinks it means.  (Except you end up
> having to deal with weird-ass decimal fractions of inches.)
>
> In order to find out what all this actually amounts to, you need to
> consult a table, like
> https://en.wikipedia.org/wiki/Nominal_Pipe_Size#NPS_tables_for_selected_sizes
> .
>
> 'For a given NPS, the OD stays fixed and the wall thickness increases
> with schedule.'  Ah, that clarifies it a bit.

That way one you can use one fitting to connect pipes of two different
schedules, no "schedule" converter needed.

> I really want to fire this reality and hire a metric one.

decimal inches are second best.  but then you get .06125 instead of 1/16.

i.e. "weird-ass decimal fractions."

Good discussion.


   
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