Flow in Pipes Q

[TyronP]

Hi lads, I'm a Mech eng student and I was wondering if you could help me out with the question in the attached picture:
-First of all I'm wondering why P2=0 because the question gives no indication that P1=150kPa is a gauge pressure
-I can understand why there is no head loss due to exit because point 2 is on the rim of the pipe just before exit but how come there is no head loss due to entry from the tank?
Thanks in advance for the help.

 

[Dougt115]

First off this post will soon be deleted as they do not allow homework here.

 

[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.

 

[bimr]

head loss due to entry from the tank = KL V2/2g

You are pumping from a pressurized tank to atmosphere

Atmosphere = 0 gauge pressure = 0 psig = 14.7 psia

The tank pressure is 150kPa psig

P1=150kPa is a gauge pressure