Piping Trivia

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
Received on Mon Jun 25 09:44:00 2001