Table 36.-PROPORTIONS OF VERTICAL TUBULAR BOILERS WITH VERTICAL TUBES. Chimneys for Vertical Steam Boilers.-The height of chimney from the ground, for a vertical steam boiler, should not be less than 50 times the internal diameter of the chimney, in order to obtain sufficient draught for the proper and steady combustion of fuel, as well as to discharge the noxious products of combustion at such a height that they will not cause a nuisance. Table 38.-PROPORTIONS OF RETURN-TUBE BOILERS, FOR SMALL STEAM BOATS, TUGS, &c. Nominal Horse Power. Thickness of ends Thickness of tube-plate of combustion-chamber Thickness of tube-plate, back of combustion 6 O 46 2 6 4 3 23 49 3 I 2 I 5 I 5 I 5 I 5 I 6 6 I 6 26 Diameter of funnel 9 ΙΟ ΙΟ ΙΟ ΙΟ I 2 I 2 I 2 Height of funnel 6 6 8 0 8 0 IO O IO O IO O IO O ΙΟ Ο Approximate weight of boiler when of wrought iron in cwts. 30 in cwts. 31 Approximate weight of boiler when of mild-steel: The Weights of the Boilers given in this and the preceding Tables do not include the weight of their Mountings or Fittings. Table 39.-WEIGHT OF ONE FOOT IN LENGTH OF WROUGHT-Iron Weight of Boilers.-The weights of boilers of different kinds, are given in tables 34 to 38; the weight of other sizes may be calculated from the weight of boiler-shells, table 40, and a rough approximation of the weight may be obtained by the following rules. Approximate Weight of Boilers in Cwts. Vertical Cross-tube Boilers = Diameter in feet Length in feet. = These rules are useful for finding a rough approximation of the weight of old steam-boilers if not exceeding the largest proportions given in Tables 34 to 38, pages 169 to 173. They do not apply in other cases. Table 40. —APPROXIMATE WEIGHT OF ONE FOOT IN LENGTH OF WROUGHT-IRON CYLINDRICAL LAP-JOINTED BoilerSHELLS, LAP AND RIVETS INCLUDED. FOR STEEL BOILER-SHELLS, MULTIPLY THE GIVEN WEIGHTS BY 1'0209. Internal Diameter. THICKNESS INCH. THICKNESS INCH. THICKNESS INCH. THICKNESS INCH. THICKNESS INCH. THICKNESS INCH. THICKNESS INCH. Single Double Single Double Single Double Single Double Single Double Single Double Single Rivered. Riveted. Riveted. Riveted. Riveted. Riveted. Riveted. Riveted. Riveted. Rive ed. Riveted. Rivet d. Riveted Double Riveted. feet. inches. lbs. lbs. lbs. lbs. lbs. lbs. lbs. lbs. lbs. lbs. lbs. lbs. lbs. lbs. o mo ao mo ao mo ao mo ao mo ao mo ao60 683 74 76 85 87 94 97 831 100 103 III 114 127 130 141 145 117 120 129 133 148 152 164 169 134 138 148 152 170 174 188 194 85 103 105 126 129 150 155 166 171 191 195 211 218 95 115 117 140 144 167 172 185 190 212 2172 235 242 104 126 129 154 158 1844 189 203 209 2334 239 258 266 114 138 141 168 172 201 206 222 228 255 261 282 291 120 123 149 133 161 152 182 186 217 224 240 247 276 282 305 3154 164 196 201 234 240 259. 266 297 3042 329 339 1384 142 172 176 210 215 251 258 277 285 318 326 352 303 148 152 184 188 224 230 268 275 296 304 340 348 376 388 157 161 195 1994 238 244 284 292 314 323 361 369 399 412 342 382 391 423 436 1754 180 218 223 266 272 318 326 351 361 403 413 446 460 185 190 230 235 280 287 335 3434 370 380 425 435 470 485 1944 199 241 246 294 301 351 361 388 399 446 456 493 5094 203 209 253 258 308 315 368 378 407 418 467 478/ 517 5333 212 218 264 270 222 228 276 282 322 330 385 395 425 437 488 500 540 557 336 345 402 412/20 444 456 510 522 564 582 231 237 287 293 350 359 418 429 462 475 531 543 587 606 6 240 247 299 305 304 373 435 447 481 494 552 565 565 611 630/ 9 249 256 310 317 378 37 452 404 499 513 5734 587 634 654 259 266 322 329 392 402 469 481 518 532 595 609 658 679 2771⁄2 285 345 35211 420 296 304 368 376 448 460 431 |