- Paul Bowers <pbowers@pipingdesign.com> wrote:
> Does anyone have additions and/or corrections to
> this quick list?
>
>
>
> -Some thick-walled, large bore piping buttwelds can
> take multiple
> shifts of welders to complete
>
> -Connecting a raised-face carbon steel flange to a
> cast iron pump
> connection can crack the nozzle due to bolt
> tourquing
>
> -Many cast valves have pre-determined tap points for
> drainage
>
> -Pipe nipples are typically 4" long
>
> -Many CAD people have no clue as to what DDIM and
> DDUNITS means in
> AutoCAD
>
> -Piping through a heat exchanger should encourage
> natural
> convection. The process flow to be heated should
> always be piped
> "up"
>
> -"Top of Concrete" and "Underside of Baseplate" are
> not
> necessarily the same thing
>
> -Drilled holes in checkvalve discs are commonplace
>
> -Steam traps collect condensate, not steam
>
> -A trycock lets you know when a vessel is full
>
> -Purging is not the same thing as draining
>
> -Sewer-based alligators won't bite you on the butt,
> even if you
> use the toilets in New York City
>
> -Pneumatic testing of a piping system is more
> dangerous than
> hydrostatic testing
>
> -H2S can kill you if inhaled in large volumes.
> Dihydrogen monoxide
> is also dangerous
>
> -Typical field fit weld allowance is 3"
>
> -The proper angle of the bevel for a buttweld is 37
> 1/2 degrees
>
> -Piping is to be designed to the nearest 1/16th of
> an inch,
> constructed to the nearest 1/8"
>
> -Weep holes are there to let rainwater drain out
>
>
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>
ddim is the line command for dimension. ddunits is the
line command to set up your annotation in
dimensioning(ex. 1/2" .5)
as far as the gas thing goes, you breathe in too much
of anything that is not natural air and it will kill you.
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Received on Mon Jun 25 18:05:00 2001