Flow in Pipes Another Q

[TyronP]

Hi again similar to my previous post I'm wondering why the solution uses the gauge pressure at point 3 (P3) surely the bolt has to oppose the absolute pressure at point 3 and I don't see how Patm would cancel out.
Thanks for your time.
Sorry for the bad quality of picture.

http://files.engineering.com/getfil...b96-9413-f0ad81382d5b&file=2015-01-16-346.jpg

http://files.engineering.com/getfil...898-9608-674175189ffa&file=2015-01-16-345.jpg

 

[Latexman]

You can ask your question here -

http://www.engineering.com/AskForum/aff/28.aspx

Good luck,
Latexman

Technically, the glass is always full - 1/2 air and 1/2 water.