Document y42g5pex9q4Mw17GKeneK804

American Society of Heating and Ventilating Engineers Guide, 1936 Table 4. Areas oe Flanged Fittings, Square Feet Nominal Pipe Sob (Inches) 1 ix . m 2 m 3 3X 4- iX 5 6 8 10 12 Flanged Coupling . 90 Deg Ell. Long Radius Fix Tbs Cross standard Extra Heavy Standard Extra Heavy Standard Extra Heavy Standard Extra Heavy Standard Extra Heavy 0.320 0.383 0.477 0.672 0.841 0.945 1.122 1.344 1.474 1.622 1.82 2.41 3.43 4.41 0.438 0.795 0.510 0.957 0.727 1.174 0.848 1.65 1.107 2.09 1.484 2.38 1.644 2.98 1.914 3.53 2.04 : 3.95 2.18 4.44 2.78 5.13 3.77 6.98 5.20 10.18 6.71 13.08 1.015 1.098 1.332 2.01 2.57 3.49 3.96 4.64 5.02 5.47 6.99 9.76 13.58 17.73 0.892 1.084 1.337 1.84 2.32 2.68 3.28 3.96 4.43 5.00 5.99 8.56 12.35 16.35 1.083 1.340 I.874 2.16 2.76 3.74 4.28 4.99 5.46 6.02 7.76 II.09 15.60 18.76 1.235 1.481 1.815 2.54 3.21 3.66 4.48 5.41 6.07 6.81 7.84 10.55 15.41 19.67 1.575 1.925 2.68 3.09 4.05. 5.33 6.04 7.07 7.72 8.52 10.64 14.74 20.41 26.65 1.622 1.943 2.38 3.32 4.19 4.77 5.83 7.03 7.87 8.82 10.08 13.44 19.58 24.87 2.07 2.53 3.54 4.06 5.17 6.95 7.89 9.24 10.07 10.97 13.75 18.97 26.26 34.11 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 heat loss through single or compound sections. It'should be emphasized that-the conductivities 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, \y2 and 2-in.-thick materials, and 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 Pipes3 Ttpes op Insulating Materials 100 F 85 per cent Magnesia Type.............................. 0.425 Corrugated Asbestos Type.-..................... -...... 0.530 (4 Plies per 1 in. thick) Corrugated Asbestos Type............................... 0,480 (8 Plies per 1 in. thick) Laminated Asbestos Type............-- ----........... 0.360 (30-40 Laminations per 1 in. thick) Laminated Asbestos Type.......--.--............... 0.545 (20 Laminations per 1 in: thick) Rock Wool Type...................................--r ----- 0.350 High Temperature Type.--......------......... 0.515 (Diatomaceous Earth,and Asbestos) Brown Asbestos Type......... .......... -............ --- 0.600 (Felted Fibre) Mean Temperature 200 F 0.465 0.650 300 F . 400 F 0.505 0.550 0.770 0.890 0.555 0.630. 0.705 0.415 0.470 0.525 0.605 0.665 .0.725 0.410 0.470 0.530 0.545 0.575 0.605 0.640 0:675 0.715 500 F 0.590 0.585 0.785 0.590 0.635 0.750 R. H. Heilman. Mechanical Engineering, Vol. 46 (1924), p. 593. 656 a . Chapter 36--Insulation of Piping Table 6. Coefficients of Transmission (U) for Pipes Insulated with 85 Per Cent Magnesia Type Insulation These coefficients are expressed in Blu per hour per square foot of pipe surface per degree Fahrenheit difference in temperature between pipe and surrounding still air at 70 F Thickness ^or Insulation (Inches) i Nominal Pipe Size (Inches) HX l IX \X 2 m 3 3X 4 m 5 6 8 10 12 120 F Hot Water 150 F | 180 F 210 F; 1 227.1 F I (5 Lb) 50 F 80 F Temperature Difference 110 FJ \ 140 F: 1 157-1 F 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 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 Steam 297.7 F (50 Lb) 227.7 F 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 F 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 0.625 0.633 0.642 0.646 0.665 0.676 X 0.550 0.558 0.566 0.573 0.577 0.596 0.606 1 0.496 ix ix ;' - 0.453 0.424 0.503 0.459 0.430 0.511 0,465 0.436 0.518 0.472 0.442 0.522 0.475 0.445 0.540 0.490 0.459 0.549 0.498 0.467 2 0.394 0.400 0.405 0.410 0.413 0.427 0.434 2-X 0.371 0.376 0.382 0.386 0.389 0.401 0.408 3: 0.352 0.357 0.362 0.367 0.370 0.380 0.387 m 3X 0.339 0.343 0.347 0.351 0.354 0.364 0.370 4 0.328 0.333 0.337 0.341 0.343 0.353 0.359 iX 0.320 0.324 0.328 0.332 0.334 0.343 0.350 5 0.312 0.316 0.320 0.324 0.326 0.336 0.342 6 0.303 0.307 . 0.311 0.315 0.318 0.328 0.333 8 0.287 0.291 0.295 0.299 0.301 0.311 0.316 . 10 0.276 0.280 0.284 0.288 0.290 0.299 0.304 12 0.272 . .0.275 0.279 0.283 0.285 0.294 0.299 2 : .. 1 - X. :x .l iX ix 2 2X 3 ; 3x 4, ix .5- 6 8 .' 1 10 : 1 12. 0.543 0.484 0.433 0.393 0.365 0.338 0.316 0.297 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 0.565 0.497 0.503 0.445 0.451 0.403 0.409 0.376 0.381 0.347 0.351 0.324 0.328 0.305 0.309 0.292 0.295 0.282 0.285 0.273 0.276 0.265 0.268 0.257 0.260 0,242 0.245 0.230 0.233 Q.225 .0.228 0.569 0.507 0.454 0.412 0.384 0.354 0.331 0.312 0.297 0.287 0.278 0.270 0.262 0.247 0.235 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 0.301 0.290 0.283 0.274 0.258 0.246 0.240 657