A test on a single$-$stage, double$-$suction radial$-$type pump operating at $1,200$

r$.$p$.$m$.$ and designed for $7,000g*p.m.$ of water gives the following data:

$($a$)$ Plot these curves and draw the efficiency curve. $($b$)$ On the same

sheet draw the three performance curves for the pump operating at

$1,000$ and $1,400$ r$.$p$.$m$.,$ checking a few points to see that the relations

between the three curves are maintained.

A plant located at an altitude of $2,500ft.($atmospheric pressure $=27,5$ in

Hg $)$ has an open feedwater heater located $10$ ft $.$ above the pump centerline.

The water in the heater has a temperature of $190F.$ If the head loss in the

line between the heater and pump is $1ft.,$ determine the available suction

head at the pump.

Determine the available suction head of a pump which is taking gas oil at a

temperature of $400F.$ from a closed tank in which the pressure is $85$ lb $.$

per

sq$.$in$.$ gage. The specific gravity of the oil is $0\mathrm{.}78$ and its vapor

pressure is $90$ lb $.$ per sq$.$ in$.$ absolute$.$ The loss in the suction pipe is $2$

ft $.$ and the punp is located at $12$ ft $.$ above the oil level in a plant at sea

level.