An inclined manometer is used to measure the pressure drop between two taps on a pipe carrying water, as shown in Figure P4.13. The manometer fluid is an oil with $\mathrm{SG}=0.92$, and the manometer reading $(L)$ is 8 in. The manometer reservoir is $4 \mathrm{in}$. in diameter, the tubing is $1 / 4 \mathrm{in}$. in diameter, and the manometer tube is inclined at an angle of $30^{\circ}$ to the horizontal. The pipe is inclined at $20^{\circ}$ to the horizontal, and the pressure taps are $40 \mathrm{in}$. apart.

(a) What is the pressure difference between the two pipe taps that would be indicated by the difference in readings of two pressure gages attached to the taps, in (1) psi, (2) $\mathrm{Pa}$, and (3) in. $\mathrm{H}_{2} \mathrm{O}$ ?

(b) Which way is the water flowing?

(c) What would the manometer reading be if the valve were closed?

FIGURE P4.13 Manometer on inclined tube

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L