A. One on the suction side, the other on the discharge.
Q. How do you find the proper size of safety valves for boilers?
A. Three square feet of grate surface is allowed for one inch area of spring loaded valves; or two square feet of grate surface to one inch area of common lever valves.
Q. Give the reasons why pumps do not work sometimes?
A. Leak in suction, leak around the plunger, leaky check valve, or valves out of order, or lift too long.
Q. How often ought boilers to be thoroughly examined and tested?
A. Twice a year.
Q. How would you test them?
A. With hammer and with hydrostatic test, using warm water.
Q. Describe the single acting plunger pump; how it gets and discharges its water?