Leaks in Boiler Tubes.
To the Editor:
We have two 100 horse power boilers, and used a water purifier and a feed pump. We had no lime in our boilers, although the water in this section is full of lime. As it took some time to clean our purifier we put on an injector and used it in place of our feed pump and have done so for one year. We put a sight feed lubricator on the steam pipe that supplies the injector and we use one pint of good coal oil morning and afternoon in each boiler and have no scale in them. The boilers, which are wrought iron, have been in use alternate weeks for seven years. They never bothered us until this winter when one at a time four tubes in each boiler cracked just inside the shell and we had to take them out and replace them. They were all right everywhere else and the boiler maker said they were rolled out too thin when they were put in. I am afraid coal oil caused the leaks. I have asked several people and they think the way we use the oil it would be impossible to cause trouble.
GEORO.E F. COOPF.R,
Xenia. Ohio. Supt.
In reference to above, the way in which the coal oil was used, and in so small a quantity, it could not possibly do any harm, as the oil is practically atomized when it enters the boiler. If the oil was simply injected through the front plate and immediately above the tubes, leaks might be expected from its use that way, as it would be liable to drop upon the tubes just where they pass through the plate, and might thus cause a leak.
The boiler-maker is no doubt right; they were thin and had seen seven years service, and probably got the first draft of cold air when the fires were drawn. This is more fruitful of leaky tubes than anything else. It is best to take the feed water well into the center of the boiler through a perforated tube, the perforations starting two feet away from the front plate; especially when cold feed water is used. Cold water feed immediately through the plate falls very often directly upon the tubes and causes leaks.
ERNEST W, NAYLOR,