Bisbee daily review., 1922-07-30

district was taken over by battery of Diesel engines in the power plant located near the site of the new con- centrator.- This battery consists of two 4-cylinder 200 horsepower Diesels directly connected to 1500 XIV gener- ators and two 5-cylinder 1250 horse 1 power engines directly connected to | S59 XIV generators The change was made unostentatiousiy and a great many people of the district are not as yet aware of the source of large part of Bisbee's power.
 | Diesel engines are comparatively | new in this country and while they may not be regarded as past the ex- 1 perimental stage entirely, still large plants are being successfully operated [ and one of the largest single users of 1 this method of power development is the Phelps Dodge Corporation through ! its various branches. Therefore, the article which follows, written by C.. Legrand. consulting engineer of the Phelps Dodge Corporation. will prove of much interest:
 Tn 1905 Dr. Douglas and the writer saw in operation at an exhibition in Liege, Belgium. cylinder, cycle, 525 H. P. Diesel engine which had the greatest power per cylinder up to that time. This size cylinder made it a practical unit for moderate size min ing power plants. and Dr. Douglas de cided to purchase an engine to give it test under operating conditions such as would obtain in Arizona mining camps. Unfortunately. the patent sit nation did not permit the importation of this engine to the United States at a reasonable cost, and the matter was | dropped. thereby retarding the use of large Diesel engines in this country 1 seven 'or eight years as the American makers were not ready to supply | large engines at that time.
 In 1907 the Copper Queen Consoli- dated Mining Company put in service | at a lime rock quarry near Douglas l. 2 single cylinder, 4 cycle Diesel en- zines of 75 H. P. each, and these gave satisfactory service for the two or three years during which this quarry was in operation.
 In 1912, when the patent situation had cleared up, the question Of trying a large Diesel engine was again taken up At that time the cycle engine | had not progressed to cylinder sizes much larger than in 1905, but the 2 | cycle engines were being made with cylinders of 250 H. P. each and larger | cylinders had been tested, but few, if any. of the larger cylinders were in daily. operation.
 The cycle engine having no eX- haust valves-as the exhaust takes place through ports in the side of the | cylinder-permits the use of fuel oils with high sulphur content which are objectionable in the cycle engine. It is, however, less efficient and more complicated as it requires the addition of a scavenging pump to blow out the burned gases and supply fresh air to | the cylinders. The higher average | temperature in the cylinder of the cycle engine was also an objection, but as this type gave the promise of being more suitable for larger units, and gave more freedom in the fuel used, it was decided to give it a test at the plant of the Burro Mountain Branch, at Tyronne, New Mexico. The F2 cycle engine also made it possible to partially compensate for the loss of power due to the altitude at which the engine operated by increasing the pressure in the cylinder at the begin ming of the stroke. This compensa- tion increases the work of the scav- enging pump and also the fuel con- sumption, but reduces the investment per horse power, and was considered economically advisable.
 First Large Engines ..
 At first one 1000 H. P. engine was considered, but before the negotia- tions for it's purchase were completed the power requirements had increas- ed, and an order was finally placed in 1913 with Carels Freres of Ghent, Bel gium, for two 1000 H. P. engines. These engines were supposed to have cylinders and deliver 1000 H. P. peak load at 6,000-ft. elevation. After accepting the order the manufacturer asked permission to furnish cylinder engines to be absolutely sure of full II filling his guarantee as regarded peak load and fuel consumption. This we found. later on, was unnecessary. It explains, however, why the cylinder engine became standard for the Phelps Dodge Corporation.
 The first engine was put in service in December, 1914, and the second in February, 1915. In the meantime the Nordberg Mfg Go. had made arrange ments with Carels Freres to manufac- ture their type of Diesel engines in this country. and subsequent engines were obtained from the Nordberg Mfg. Go.
 Total of 13,oOo H. P.
 The operating results obtained at Tyrone led the other branches of'the Phelps Dodge Corporation and allied companies to take care of their in creased power requirements by the in stallation of Diesel engines, and to try engines with 800 H. P. per cylin- der. At the present time the various installations are as follows:
 i TYRONE-4 5-cyl., 1250 H. P. en- zines, direct connected to 60 cycle, Y 3 phase. $50 Xiv. generators. 3-cyl., II 750 IT. P. engines. direct connected to | 3700 C. F., 95-1bs. air compressors. | MORENCI-3 5-cyl., 1250 H. P. en- ! zines, direct connected to 60 cycle, 2 phase. $50 Xiv. generators. 1 5-cyl., | 1250 H. P. engine, direct connected to 6400 c. F., 100-1bs. air compressor. | NAHOZART-o A-avI O0O0 IT D on