<html><head></head><body><div style="color:#000; background-color:#fff; font-family:lucida console, sans-serif;font-size:13px">> I really want to fire this reality and hire a metric one.<div id="yui_3_16_0_1_1490547775918_119326"><span></span></div><div id="yui_3_16_0_1_1490547775918_119364" class="qtdSeparateBR">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.<br><div id="yui_3_16_0_1_1490547775918_119495"><br></div><div id="yui_3_16_0_1_1490547775918_119492">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.<br></div></div><div style="display: block;" id="yui_3_16_0_1_1490547775918_119390" class="yahoo_quoted"> <div id="yui_3_16_0_1_1490547775918_119389" style="font-family: lucida console, sans-serif; font-size: 13px;"> <div id="yui_3_16_0_1_1490547775918_119388" style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div id="yui_3_16_0_1_1490547775918_119387" dir="ltr"> <font id="yui_3_16_0_1_1490547775918_119386" face="Arial" size="2"> <hr id="yui_3_16_0_1_1490547775918_119385" size="1"> <b><span style="font-weight:bold;">From:</span></b> Tony Godshall <togo@of.net><br> <b><span style="font-weight: bold;">To:</span></b> Paul Zander <paulz@ieee.org> <br><b><span style="font-weight: bold;">Cc:</span></b> "conspire@linuxmafia.com" <conspire@linuxmafia.com><br> <b><span style="font-weight: bold;">Sent:</span></b> Monday, March 27, 2017 4:34 PM<br> <b><span style="font-weight: bold;">Subject:</span></b> pipes, imperials, and metrics [was Re: [conspire] Watering automation: an edge case cautionary tale]<br> </font> </div> <div class="y_msg_container"><br><div dir="ltr">...<br></div><div dir="ltr">> 'Outer Diameter (OD)': Means what one thinks it means. (Except you end up<br></div><div dir="ltr">> having to deal with weird-ass decimal fractions of inches.)<br></div><div dir="ltr">><br></div><div dir="ltr">> In order to find out what all this actually amounts to, you need to<br></div><div dir="ltr">> consult a table, like<br></div><div dir="ltr">> <a href="https://en.wikipedia.org/wiki/Nominal_Pipe_Size#NPS_tables_for_selected_sizes" target="_blank">https://en.wikipedia.org/wiki/Nominal_Pipe_Size#NPS_tables_for_selected_sizes</a><br></div><div dir="ltr">> .<br></div><div dir="ltr">><br></div><div dir="ltr">> 'For a given NPS, the OD stays fixed and the wall thickness increases<br></div><div dir="ltr">> with schedule.' Ah, that clarifies it a bit.<br></div><div dir="ltr"><br></div><div dir="ltr">That way one you can use one fitting to connect pipes of two different<br></div><div dir="ltr">schedules, no "schedule" converter needed.<br></div><div dir="ltr"><br></div><div dir="ltr">> I really want to fire this reality and hire a metric one.<br></div><div dir="ltr"><br></div><div dir="ltr">decimal inches are second best. but then you get .06125 instead of 1/16.<br></div><div dir="ltr"><br></div><div dir="ltr">i.e. "weird-ass decimal fractions."<br></div><div dir="ltr"><br></div><div dir="ltr">Good discussion.<br></div><br><br></div> </div> </div> </div></div></body></html>