A. No. The main valve should then be closed.
51. Q. Should the firing valve be depended upon to shut off the fire at any time? Why?
A. No. From constant use they are frequently leaking and the trouble is not detected while in use, and again there is always danger of the handle being moved by workmen or others about the cab.
52. Q. What is a heater box?
A. It is an apparatus having two passages, one for steam passing from boiler to heater pipes in tank and another passage for oil from tank before it is delivered to burner. In this manner the oil before reaching the burner is heated much higher than the temperature of that contained in tank.
53. Q. In the event of the heater pipes or connections becoming defective, how could the oil be heated in tank?
A. By closing the firing valve, closing the valve on heater pipe, and opening valve on heater box, the steam from heater throttle can be passed directly through the oil feed pipe to the fuel supply.
54. Q. In the event of an objectionable quantity of water in oil, how can it be removed?
A. In some instances the tanks are provided with drain pipes for this purpose, but in the absence of same, the feed hose or pipe between engine and tank can be disconnected and used as a drain to fuel oil tank.
55. Q. What effect has leaks between fuel tank and firing valve?