Locomotive boiler construction; a practical treatise for boilermakers, boiler users and inspectors .. . Figure 332Showing angles. co-tangent and from the table we could obtain the sineand cosine of different angles. In finding the weight of water in boilers, we knowthe distance from the water level or the top gage cock,to the top line of the boiler. See H, Fig. 333. We alsoknow the inside diameter of the boiler D and the lengthL for the different sheets. In obtaining the area of thesegment H, we use table five. 343 General of segment = D2 X M M~*=-^ = .2o6 D 68 The value for M corr
Locomotive boiler construction; a practical treatise for boilermakers, boiler users and inspectors .. . Figure 332Showing angles. co-tangent and from the table we could obtain the sineand cosine of different angles. In finding the weight of water in boilers, we knowthe distance from the water level or the top gage cock,to the top line of the boiler. See H, Fig. 333. We alsoknow the inside diameter of the boiler D and the lengthL for the different sheets. In obtaining the area of thesegment H, we use table five. 343 General of segment = D2 X M M~*=-^ = .2o6 D 68 The value for M corresponding to .206 is found tobe .116651 by reference to table five. Therefore segment area = D2 X .1116651 = 682 116651 = 541 The volume of the water in the boiler in gallonswould be (68 area — Segment area) X L 231(3632 — 541) XL 3091 X 116 231 231 = 1553 gallons. In a similar manner each one of the other courses can The Dtrry Collard Co. Figure 333Areas of segments. 344 Strength of materials. Table six gives the properties of saturated steamfrom one to 1,000 pounds pressure. This is useful in de-termining the expansion of a boiler. The temperature ofthe boiler plate is obtained from the table by finding thetemperature corresponding to the working pressure andthen figuring out the expansion by the use of anothertable. Strength of Materials. The tensile strength of bolts is given in table we have a bolt ij4 inches in diameter and wish to sup-port 5,000 lbs., the stress in this bolt will be about 7,000,and similarly if we decide what stress is allowable in agiven bolt, we can find what pull the bolt will resist fromthe table. The breaking strength of bolts is considerably higherthan the working strength, in fact it is four or five timeshigher as will be noticed by referring to table figures are useful as they represent the pull atwhich the bolt will be broken. All the pins, bolt
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