Q. If oiler is not in use and in danger of freezing, what should be done?
A. Leave valves D, G and E open, and all water will be drained off.
Q. If the glass tube in oiler should get broken, what should be done?
A. Shut valves D and E, remove broken glass and replace with new.
Q. How can oil be prevented from sticking to lubricator glasses?
A. A very simple remedy is to fill the glass with glycerine and let the oil feed through it.
INJECTOR.
An Injector is an automatic machine attached to a boiler, for injecting or forcing water into it and at the same time heating the water to a very high temperature, which saves fuel and prevents the danger of sudden contraction of the plates and flues. It can be used independently and is indispensable on a farm engine.
In piping an injector to boiler, use as short and as straight pipes as possible and especially avoid short turns. Take steam directly from boiler, and have a globe valve in steam pipe close to injector; have the water suction or supply pipe independent of any other connection, and it must be supplied with a globe valve close to injector. This pipe and connections must be absolutely air tight; the slightest leak will cause trouble. The discharge pipe to boiler must be supplied with a tight and reliable check valve. If valve leaks, the injector will become hot and cause no end of annoyance. It is a good plan to put a stop valve between check and boiler in discharge pipe, so that check valve maybe taken off and repaired, or a new one put on without loss of time. A foot of straight pipe screwed into the overflow assists in starting an injector, especially at low pressure.