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

[Tony Godshall]

...
> '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.