For the cultural value:
I tell , the newbies,for pipe, think in a 2" ( x") flow of liquid, then
cover it with the pipe material.
>
> On Sep 5, 2004, at 5:05 PM, Pete's Mail wrote:
>
> > you will find the bores are also not exactly 1/2" or 1" but have an
> > odd exact dimesion
> For cultural value, the reason the actual pipe ID is larger than the
> nominal is to provide an allowance for fouling and scale. The reason
> that 2x4 lumber is called 2x4 is that the finished lengths are made
> from sections that actually are 2 inches by 4 inches. And the US sheet
> steel gage numbers denominate unit weight rather than thickness. 3 gage
> plate weighs 10.00 lb/ft2, with the nominal thickness based on a
> density of 0.2904 lb/in^3, which in turn derives from taking the weight
> of a steel plate 1 inch thick as exactly 41.82 lb. This isn't strictly
> correct, but the nominal thicknesses got into common use before anyone
> knew better. The best advice these days is to order by thickness and
> don't bother about gage numbers.
>
> Christopher Wright P.E. |"They couldn't hit an elephant at
> chrisw@skypoint.com | this distance" (last words of Gen.
> ...................................| John Sedgwick, Spotsylvania 1864)
> <a href="http://www.skypoint.com/~chrisw">http://www.skypoint.com/~chrisw</a>
>
>
>
>
> =========================================
> PipingOffice - Excel Spreadsheets for Piping Calculations
> <a href="http://www.pipingoffice.us/">http://www.pipingoffice.us/</a>
> =========================================
> Main site: <a href="http://www.pipingdesign.com">http://www.pipingdesign.com</a>
>
> Yahoo! Groups Links
>
>
>
>
>
>
Received on Mon Sep 06 11:23:00 2004
This archive was generated by hypermail 2.1.8 : Tue Mar 04 2008 - 11:40:09 EST