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## Pipe Stresses Perpendicular To The Longitudinal Axis

The internal or external pressures on the pipe walls cause the stresses acting perpendicular to the longitudinal axis of a pipe. Internal pressure creates a stress commonly called hoop tension

The sum of the forces in the horizontal direction is

pD=2F

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## Water Hammer

Water hammer is a change in pressure, either above or below the normal pressure, caused by a variation of the flow rate in a pipe.

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## Orifice Discharge Into Diverging Conical Tubes

This type of tube can greatly increase the flow through an orifice by reducing the pressure at the orifice below atmospheric. The formula that follows for the pressure at the entrance to the tube is obtained by writing the Bernoulli equation for points 1 and 3 and points 1 and 2

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## Fluid Jets

Where the effect of air resistance is small, the path of projectile is followed when a fluid discharged through an orifice into the air
The initial velocity of the jet is

V0 = Cv?2gh

where h= head on center line of orifice, ft (m),
Cv =coefficient of velocity.

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