A U-tube manometer containing a liquid of specific gravity S measures gauge pressure of water flowing in a pipe.
h2 = difference in level of manometric liquid in the two limbs
h1 = height of water between point of connection of pressure tap and level of manometric liquid in the limb to which it is connected by a tube bending down.
The measured gauge pressure is:
1
h2 m of manometric liquid
2
h2.S m water
3
(h2.S – h1) m of water
4
h1 m water
5
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