. The Locomotive . ne in ordinary operation can drop low enough toexpose portions of the shell unprotected by water to the gases. Ifthis is possible the setting should be changed immediately so thatthis contact will become impossible. 230 THE LOCOMOTIVE. [ October, Some Mathematics of Boiler Construction H. J. Vander Eb. In checking over the design of an ordinary horizontal tubularboiler, to see whether it conforms to the requirements of theA. S. M. E, boiler code, most of the details of construction involvecalculations of a comparatively simple nature. With the helpof the calculation rules of
. The Locomotive . ne in ordinary operation can drop low enough toexpose portions of the shell unprotected by water to the gases. Ifthis is possible the setting should be changed immediately so thatthis contact will become impossible. 230 THE LOCOMOTIVE. [ October, Some Mathematics of Boiler Construction H. J. Vander Eb. In checking over the design of an ordinary horizontal tubularboiler, to see whether it conforms to the requirements of theA. S. M. E, boiler code, most of the details of construction involvecalculations of a comparatively simple nature. With the helpof the calculation rules of this excellent Code the experiencedinspector can usually decide in quick order whether such a boilerconforms. One of the details of horizontal tubular boiler design, however,that requires calculations of a somewhat involved nature is whereuse is made of angle irons or other members securely riveted tothe rear head below the tubes for attaching the through stays asshown in fig i. oooooooooooo,000000 S3^Z£x£ANCL£. %PtN ^^R/\/€rs Fig. I. A worked out example of the necessary calculations to checkthis construction will best serve to illustrate. The area to be stayed below the tubes in fig. i is 350 squareinches and the working pressure is 150 total load P = 350 X 150 = 52,500 lbs. The through stays have a least diameter of 2^ so thataccording to paragraph 220c, on page 58 of the Code*) we mayallow 9,000 lbs. fibre stress per square inch in these stays. The least area required in each through stay is then: 52300 sq in., which requires a least diameter of stay 9,000 X 2of inch. The two 2^ stays are therefore within requirements. The least required rivet area for attaching braces to head(according to par. 223-8 on page 60) equals: y. 2 y. = square inches. *1918 Edition. A. S M. E. Boiler Code. 1919.] THE LOCOMOTIVE, 231 In the design shown are used fourteen 15/16 inch rivets havinga combined area of square inches so that this rivet detail is
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