Discussion on "gas engines in city railway and lighting service", Charlotte, N. C., March 30, 1910. (see proceedings for April, 1910)

1910 Proceedings of the American Institute of Electrical Engineers  
H. K. English: I have been greatly interested in Mr. Latta's paper on Gas Engines. The record given of plant performance showing a total shut-down of. but two hours and forty-five minutes for the year is indeed an enviable one. Also, I consider the data given on operating costs of particular value, as it bears the stamp of " real life " instead of being an engineering estimate, which at best is often only a " wise guess ". It is to be regretted, however, that the items of interest and
more » ... erest and depreciation have been omitted. Figures on cost of generating power, with these items omitted, are very misleading, this being particularly true of a gas engine plant where installation costs vary widely and little is known regarding such costs. If Mr. Latta would give some figures on installation costs of the plant under consideration, it would add greatly to the value of the other data given. I would also like to ask Mr. Latta how often he finds it neces sary to shut down his gas generators for cleaning, and how long a generator is out of service during this cleaning process. F. D. Gatchell: Referring to the paragraph of this paper deal ing with the piston rod packing, I would like to state that while it is true that the piston rod packings are removed occasionally to be cleaned and adjusted, this is becoming more and more in frequent owing to a better knowledge of how to adjust and as semble this packing before placing it on the piston rod and also to a much better system of lubrication. When these engines were first placed in operation considerable trouble was experi enced by the blowing out and leaking of the packing, and if this condition was allowed to go on for any length of time the garter springs holding the segments in place were soon distorted owing to the high temperature of the gas blowing through. This made the packing segments warp and not fit the rod prop erly. We have overcome these troubles very effectively, however, first, by careful study of the lubricating conditions, and second, by a different method of applying the garter springs. After a series of experiments with different kinds and quantities of oil, we believe that we have hit upon a combination which effectively fits this practice. This is borne out by the fact that we have several sets of packing on these engines which have been in continuous operation for several months, one set having been in service for over ten months without cleaning. This is very desirable for these engines as there are eight sets of piston rod packing on each engine to be kept up. The method we have adopted in regard to installation of the garter springs which hold the segments of packing together, is that instead of using the continuous spring all the way around the packing as formerly, to divide the spring into short sections con-
doi:10.1109/paiee.1910.6660568 fatcat:t4ze6dzinbafvg7yjclr6crxqe