. The railroad and engineering journal . of weights. The question of durability in service is one which natur-ally suggests itself when light steel or iron pipes are dis-cussed. J^xperience on the Pacific Coast seems to hav? Vol. LXIII. No. 3] ENGINEERING JOURNAL. 119 settled this question, as the cheap expedients adopted forwater-conveyance during the days when hydraulic miningwas most extensively conducted, have been followed eversince in permanent exgineering works. The best attain-able data on this subject which I have found are presentedin a paper read by Hamilton Smith, Jr., before the B
. The railroad and engineering journal . of weights. The question of durability in service is one which natur-ally suggests itself when light steel or iron pipes are dis-cussed. J^xperience on the Pacific Coast seems to hav? Vol. LXIII. No. 3] ENGINEERING JOURNAL. 119 settled this question, as the cheap expedients adopted forwater-conveyance during the days when hydraulic miningwas most extensively conducted, have been followed eversince in permanent exgineering works. The best attain-able data on this subject which I have found are presentedin a paper read by Hamilton Smith, Jr., before the BritishIron & Steel Institute. Much of the information contained pulled off by the adobe clay in which most of them arelaid ; but they have a record of useful life since 1853, andmany towns are supplied with water under considerableheads from pipes of this kind which have been more than20 years in service. A welded pipe carefully coated withasphalt should, with fair treatment, have a record at leastas good, and probably much MACHINE FOR MAKING SPIRAL-WELD TUBES. in this paper is quite surprising, especially in the case ofthe two mains across Humbug Cafion. These pipes werelaid in 1868. They are of 26 in. diameter, 1,194 ft. long, of commoniron -f,; in. in thickness, single-riveted. During all this timethey have been delivering water under 120 ft. head, andMr. Smith gives the maximum tensile strain in pounds onthe metal per square inch as 11,500. Large as these fig-ures look, they are simply the result of applying to the con-ditions given in Rankines well-known formula for theircylindrical shells. Riveted pipe in its best estate labors under the disad-vantage of inherent structural weakness, and liability torust between the overlapping edges and around the of this character on the Pacific Coast are very roughs\y tarred in position, and the coating is quite Jiable tp t3§ The coupling of light-pressure pipes involves no diffi-culties, but it entails new metho
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectrailroa, bookyear1887
