Document rBxj7qkGLDXj4bMke1GQ3o4De

American Society of Heating and Ventilating Engineers Guide, 1937 Table 4. Areas of Flanged. Fittings, Square Feet Nominal Pipe Size (Inches) -Flanged - Coupling . 90 DrqEll Long Radius .Ell Tn Cboss Standard Extra Heavy Standard Extra Heavy Standard Extra Heavy Standard Extra Heavy Standard Extra Heavy i. IX iH 2 2X 3 &x 4 _5 ' 6' 8 10 12 0.320 0.438 0.795 1.015 0.892 1.083 1.235 1.575 1.622 2.07- 0.383 0.477 0.672 0.841 0.510 0.727 0.848 1.107 0.957 1.174 1.65 2.09. 1.098 1.332 2.01 2.57 1.084 1.337 1.84 2.32 1.340 1.874 2.16 2.76 1.481 1.815 2.54 3.21 1.925 2.68 3.09 4.05 1.943 2.38.. 3.32 4.19 2.53 3.54 4.06 5.17 0.945 1.484 2.38 3.49 2.68 3.74 3.66 5.33 4.77 6.95 1.122 1.644 1.344 1.914 1.474 2.04 1.622 ,2,18; 2.98 3.53 3.95 4.44 3.96 4.64 5.02 5.47 3.28 3.96 4.43 5.00 4.28 4.99 ,5.46 6.02 4.48 5.41 6.07 6.81 6.04 7.07 7.72 8.52 5.83 7.03 7.87 8.82 7.89 9.24 10.07 10.97 182. 2.41 3.43 41 ` 2:78 5.13 ,3:77, 6.98 ,5.20< 10,18 6.71 13.08 6.99 9.76 13.58 17.73 5.99: 8.56 12.35 .16.35 1 7.76 11.09 15:60 18.76 7.84 10.55 15.41 19.67 10.64 14-74 20.41 26.65 10.08 13.44 19.58 24.87 13.75 18.97 26.26 34.11 a Including areas of accompanying, flanges bolted to the fitting. outer surface temperatures of the insulations.: This method of stating conductivities makes it possible readily to Calculate the heht loss through single or compound sections. It; should ibe emphasized that the con ductivities given ;in Table 5 for the various insulations are the average of values obtained from a number of tests made on each type of material, also that all variables due to differences in thickness, pipe sizes, and air conditions, are eliminated. Individual manufacturer's materials will, of course, vary in conductivity to some extent from these values. The heat losses through six of the types of insulation given in Table 5 for 1, 1J4 and 2-in. thick materials, arid- for temperatures commonly encountered in engineering practice can be obtained from Tables 6 to 11, Table 5. Conductivities (k) of Various Types of Insulating Materials for Medium and High Temperature Pipes* Ttpbs .op Insulating Materials i Mean Temperature - 100 F . 200 F 85 per cent Magnesia Type : Corrugated Asbestns Tyne (4 Plies per 1 in. thick) 0.425 0.465 0.530 0.650 Corrugated Asbestos Type............................ 0.480 0.555 (8 Plies per 1 in.1 thick) Laminated Asbestos Type.....____________ 0.360 0.415 (30-40 Laminations per 1 in. thick) Laminated Asbestos Type______ _____ _____ 0.545 ; 0.605 (20 Laminations per 1 in. thick) ! Kock Wool Tvoe,,.................. Hieh Temperature Type (Diatomaceous Earth and Asbestos) : 0.350 0.410 0.515 0.545 Brown Asbestos Type,_______________ ____ .0.600 0.640 ' (Felted Fibre) ; 300 F i 0.505 0.770 0.630 0.470 0.665 0.470 0.575 0.675 400 F /r50F 0.550 0.590 0.890 0.705 0.525 0.585 0.725 0.785 V A- 0.530 0.590 0.605 0.635 0.715 0.750 R. H. Heilman. Mechanical Engineering, Vol. 46 (1924), p. 593. 672 Chapter 36--Insulation of Piping, T*ble 6. Coefficients of Transmission {U) for Pipes Insulated with 85 Per Cent Magnesia Type Insulation These coefficients are expressed in Bln per hour per square foot of pipe surface per degree Fahrenheit difference in temperature between pipe and surrounding still air at 70 F TSICXNB88 InsuOlPation (Inches) i IX 2 - ' -i - NoPmipinsal Sub (Inches) x X 1 IX IX 2 2X 3 3X 4 \X 5 6 8 10 12 X X 1 XX ix .2 2X 3 3X 4 iX 5 6 8 10 12 X X 1 ix m2 2X 3 3X 4 *x 5 6 8 10 12 120 F 50V 0.744 0.672 0.613 0.562 0.532 0.500 0.475 0.455 0.441 0.429 0.420 0.411 0.402 0.387 0.375 0.369 Hot Water . 210 F j Steam 150 F 180 F 227.1 F "297.7 (5 Lb) (50 Lb) Temperature Difference SO V 110 F 140 V 157.1 V 227.7 F 0:754 0.681 0.621 0.570 0.539 0.506 0.481 0.461 0.447 0.435 0.425 0.416 0.408 0.392 0.380 0,374 0.764. 0.689 0.629 0.577 0.546 0.512 0.487 0.467 0.452 0.441 0.431 0.422 0.413 0.397 0.385 . 0.378 0:774 0.697 0.637 0.585 0.553 0.519 0.493 0.474 0.458 0.446 0.437 0.427 0.419 0.403 0.390 0.383 0.779 0.701 0.641 0.589 0.557 0.523 0.497 0.477 0.462 0.449 0.440 0.430 0.422 0.405 0.393 0.386 0.802 0.721 0.659 0.606 0.573 0.538 0.512 0.492 0.475 0.463 0.453 0.443 0.435 0.418 0.405 0.398 337.9 F (100 Lb) 267.9 0.814 0.731 0.670 0.617 0.582 0.547 0.520 0.500 0.483 0.471 0.460 0.450 0.442 0.425 0.412 0.405 0.617 0.550 0.496 0.453 0.424 0.394 0.371 0.352 0.339 0.328 0.320 0.312 0.303 0.287 0.276 0.272 0.625 0.558 0.503 0.459 0.430 0.400 0.376 0.357 0.343 0.333 0.324 0.316 0.307 0.291 0.280 0.275 0.633 0.566 0.511 0.465 0.436 0.405 0.382 0.362 0.347 0.337 0.328 0.320 0.311 0.295 0.284 0.279 0.642 0.573 0.518 0.472 0.442 0.410 0.386 0.367 0.351 0.341 0.332 0.324 0.315 0.299 0.288 0.283 0.646 0..S77 0.522 0.475 0.445 0.413 0.389 0.370 0.354 0.343 0:334 0.326 0.318 0.301 0.290 0.285 0.665 0.596 0.540 0.490 0.459 0.427 0.401 0.380 0.364 0.353 0.343 0.336 0.328 0.311 0.299 0.294 0 676 0.606 0.549 0.498 0.467 0.434 0.408 0.387 0.370 0.359 0.350 0.342 0.333 0.316 0.304 0.299. 0.543 0.484 0,433 0.393 0.365 0.338 0.3160.297 0.284 0.275 0.266 0.258 0.250 0.236 0.224 0.219 0.551 0.490 0.439 0.398 0.370 0.343 0.320 0.301 0.288 0.278 0.270 0.262 0.254 0.239 0.227 0.222 0.558 0.497 0.445 10.403 0.376 0.347 0.324 0.305 0.292 0.282 0.273 0.265 0.257 0.242 0.230 0.225 0.565 0.569 0.503 0.507 0.451 0.454 0.409 0.412 0.381 0.384 0.351 0.354 0.328 0.331 0.309 0.312 0.295 0.297 0.285 0.287 0.276 | 0.278 0.268 0.270 0.260 0.262 0.245 0.247 0.233 0.235 0.228 | 0.230 0.587 0.523 0.467 0.424 0.397 0.364 0.341 0.321 0.306 0.296 0.286 0.278 0.270 0.255 0.242 0.237 0.597 0.532 0.476 0.432 0.402 0,370 0.347 0.326 0.311 0.30U 0.290 0.283 0.274 0.258 0.246 0.240