Safety Engineering Volume 33 (1917)
This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1917 edition. Excerpt: ...of such a water glass are provided with means by which the glass can be blown out, yet it is a fact that this appliance is seldom used in a large number of stationary boiler plants. Almost invariably one will find that the boiler has three try cocks alongside the gage glass, which are placed there for the purpose of checking the accuracy of the water glass..Since necessity has shown that these try cocks should be put on the boiler, does it not naturally follow that they ought to be tried frequently, not only to prove the level of the water in the glass, but also to prove that the cocks themselves are in proper working order? In all probability there is no more neglected appliance on any boiler than these same poor, unoffending try cocks, and yet if the gage glass breaks and another cannot be readily obtained, they are the boiler attendant's sole guide as to the true level of the water in the boiler, on which his safety, and possibly the safety of many others, depends. The safety valve is another appliance with which every boiler must be equipped. As the name implies, this valve is put on to prevent over-pressure on the boiler, and when the boiler is first installed, a safety valve, set to blow at the safe working pressure of the boiler, is always provided, and yet, strange to say, very few engineers or boiler attendants seem to think it necessary to test the safety valve, either by running up the steam pressure or by lifting the valve from its seat by the lever that is provided. One can only liken such men to those who would sit on a barrel of gunpowder smoking a cigarette. The bottom blow-off pipe of a boiler is provided, not only for the purpose of draining the boiler, but also, and probably of more importance, for the purpose of...
- 189 x 246 x 13mm | 458g
- 13 Sep 2013
- United States
- black & white illustrations