Single and Double Air Kits - New York Blower

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AIR KIT ENGINEERING AND SELECTIONBEARING EXPANSIONSteel shafts expand .0000067 [316 stainless steel =.000009] inches per inch of shaft length per degreeFahrenheit. This is 1 ⁄2” for a 10-foot-long shaft heated600°F. Therefore, whenever an Air Kit handles high temperatureair, allowances must be made to avoid bindingthe bearings and causing premature bearing failure.Standard pillow-block bearings do not provide for expansionand can only be used in low-temperature applicationsor in unusual applications where the bearingsupports have the same expansion characteristics as theshaft.Expansion bearings with limited expansion capability areavailable but most do not offer the degree of expansionrequired for these applications.nyb offers expansion bearings specifically designed foruse with Air Kits. Bearing pairs include one expansionand one fixed bearing [drive end]. The expansion bearingincludes a special high-heat key to allow for thermalexpansion.SHAFTINGAny rotating body will exhibit severe vibration when operatedat a particular speed called the critical speed. Safespeeds as shown in this bulletin are based on 80% of thiscritical speed which is dependent on:Bearing centersLocation and weight ofShaft material [SAE 1040] drive sheaveShaft diameter[s]Location and weight ofTemperature of operation wheelsThe pre-calculated safe speeds given in Chart VII arebased on standard dimensions as shown. It is usuallypossible to design oven construction so that bearing supportsand cabinet dimensions meet standard Air Kit dimensions.Any variation from standard dimensions will requirea change in safe speeds as indicated on pages 11-14.Air Kit shafting must be high quality, hot rolled, turned,ground and polished of the appropriate alloy. Expansionand contraction in oven and dryer work aggravates anylooseness in the wheel-shaft fit. Cold rolled shafting isnot acceptable. Air Kit shafting is straightened after allmachining to a maximum runout of .002 inches.PROCEDURES STEPS EXAMPLE:HOW TO SELECT AN AIR KITSelect an Air Kit for an oven requiring 8000 CFM at 3”WG at 70°F. withoperating temperature of 700°F., 4” walls approximately 4 1 ⁄2 feet apartin a closed-plenum design.Determine Air Kit size and if oneor two fans are to be used.Determine plenum design andbearing-center distance.Correct wheel safe speed for maximumtemperature.Check wheel safe speed for maximumtemperature.Select shaft size and check shaftspeed at operating temperature.Determine if coolers are required.Final selection and operating BHP.There are three possible selections: 1. Double Size 12 Air Kit at 2564 OV,1483 RPM at 7.24 BHP. 2. Double Size 15 Air Kit at 2000 OV, 1174 RPMat 6.06 BHP. 3. Single Size 18 Air Kit at 2492 OV, 948 RPM at 5.93 BHP.Selection 1 has a high BHP and OV. Selection 3 is more efficient but OV isfairly high. The Double combination of selection 2 gives the best air distributionacross oven and is efficient. Use a Double Size 15 Air Kit.Using a predesigned Air Kit package from page 10, the standard wall-to-walldimension for a Double Size 15 Air Kit is 54” [62” – 8”].From Chart II, VP/SP = .25/3 = .08. The A dimension for a Double Size 15Air Kit is 5” or 33 1 ⁄3% of the 15” wheel diameter. From Chart III use .1 as theclosest VP/SP to .08.1174 RPM x 1.02 = 1197 RPM6.06 BHP x 1.10 = 6.67 BHP [standard air 70°F./.075 lb./ft. 3 ]Chart VII shows that a Size 15 wheel has a maximum safe speed of 1780RPM at 70°F. Using temperature correction factor from Chart VI at 700°F.1780 RPM x .80 = 1424 RPMMaximum safe speed at 700°F....well above the required 1197 RPM.Required speed is 1197 RPM. Chart VII shows that a 15B39-2 Air Kit with4” wall has a maximum shaft speed of 1555 RPM at 70°F. Using the correctionfactor from Chart VI at 700°F.:1555 RPM x .92 = 1430 RPM at 700°F.,well above the 1197 RPM required.Because the application is above 300°F. shaft coolers are required.Standard 15B39-2 Air Kit with shaft-cooler assemblies, BHP at operatingtemperature of 700°F. is 6.67 ÷ 2.12 [Chart V] = 3.15 BHP.PAGE 6
SIZE 12Wheel diameter: 12.3"Wheel circumference: 3.21'Maximum safe speed = 2180 RPMOutlet area: 1.56 sq. ft.CFMOV1⁄4"SP 1⁄2"SP 3⁄4"SP 1"SP 1 1 ⁄2"SP 2"SP 2 1 ⁄2"SP 3"SP 4"SP 5"SP 6"SPRPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP1500 962 449 0.13 603 0.22 740 0.322000 1282 499 0.24 625 0.34 742 0.45 852 0.582500 1603 563 0.40 668 0.51 768 0.64 864 0.78 1042 1.09 1203 1.433000 1923 637 0.65 726 0.77 813 0.91 896 1.06 1056 1.39 1206 1.77 1346 2.163500 2244 717 0.99 792 1.11 866 1.26 941 1.42 1083 1.78 1221 2.18 1350 2.60 1472 3.054000 2564 800 1.44 864 1.57 932 1.73 996 1.89 1125 2.28 1252 2.70 1371 3.15 1483 3.62 1705 4.664500 2885 886 2.01 941 2.14 999 2.31 1059 2.49 1174 2.89 1290 3.34 1399 3.81 1505 4.31 1707 5.37 1904 6.555000 3205 972 2.72 1022 2.87 1074 3.04 1126 3.23 1233 3.65 1338 4.12 1438 4.60 1536 5.12 1730 6.26 1913 7.48 2083 8.735500 3526 1060 3.59 1105 3.75 1151 3.92 1199 4.12 1295 4.56 1389 5.03 1485 5.55 1578 6.10 1758 7.29 1925 8.50 2091 9.846000 3846 1149 4.63 1189 4.80 1231 4.98 1274 5.18 1362 5.63 1453 6.15 1539 6.68 1625 7.24 1791 8.45 1956 9.78 2116 11.26500 4167 1238 5.86 1276 6.04 1313 6.22 1352 6.43 1434 6.90 1515 7.42 1597 7.98 1677 8.56 1836 9.83 1987 11.2 2141 12.6SIZE 15Wheel diameter: 15.0"Wheel circumference: 3.93'Maximum safe speed = 1780 RPMOutlet area: 2.00 sq. ft.CFMOV1⁄4"SP 1⁄2"SP 3⁄4"SP 1"SP 1 1 ⁄2"SP 2"SP 2 1 ⁄2"SP 3"SP 4"SP 5"SP 6"SPRPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP2000 1000 368 0.16 484 0.27 587 0.382600 1300 410 0.28 509 0.40 597 0.53 681 0.673200 1600 458 0.45 545 0.59 623 0.74 697 0.90 832 1.24 959 1.613800 1900 511 0.68 589 0.85 661 1.02 727 1.20 849 1.58 964 1.99 1071 2.41 1173 2.854400 2200 565 0.98 638 1.18 702 1.38 762 1.58 875 2.00 981 2.44 1078 2.89 1175 3.39 1356 4.425000 2500 623 1.37 689 1.60 750 1.83 805 2.06 910 2.52 1006 2.99 1098 3.49 1189 4.02 1359 5.13 1516 6.295600 2800 683 1.86 742 2.12 799 2.38 850 2.63 950 3.14 1038 3.65 1127 4.20 1207 4.74 1369 5.94 1514 7.156200 3100 744 2.46 798 2.75 849 3.03 899 3.31 993 3.88 1079 4.45 1160 5.03 1239 5.63 1385 6.86 1528 8.18 1661 9.536800 3400 807 3.18 855 3.50 904 3.82 951 4.13 1037 4.74 1118 5.35 1197 5.98 1269 6.60 1409 7.92 1542 9.29 1675 10.87400 3700 869 4.04 914 4.38 959 4.72 1003 5.07 1086 5.74 1164 6.41 1237 7.08 1307 7.75 1441 9.16 1571 10.6 1690 12.18000 4000 932 5.04 974 5.41 1015 5.78 1057 6.15 1135 6.88 1209 7.60 1278 8.31 1349 9.08 1475 10.5 1598 12.1 1711 13.6SIZE 18Wheel diameter: 18.3"Wheel circumference: 4.77'Maximum safe speed = 1470 RPMOutlet area: 3.21 sq. ft.CFMOV1⁄4"SP 1⁄2"SP 3⁄4"SP 1"SP 1 1 ⁄2"SP 2"SP 2 1 ⁄2"SP 3"SP 4"SP 5"SP 6"SPRPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP3000 935 283 0.21 388 0.364000 1246 311 0.38 396 0.55 474 0.74 546 0.955000 1558 346 0.62 419 0.83 487 1.04 550 1.27 670 1.806000 1869 385 0.96 451 1.21 511 1.46 568 1.72 675 2.29 774 2.907000 2181 427 1.42 487 1.72 540 2.00 591 2.29 688 2.90 779 3.57 866 4.28 947 5.028000 2492 471 2.02 526 2.36 575 2.69 621 3.01 710 3.69 793 4.40 874 5.16 948 5.93 1092 7.629000 2804 515 2.77 566 3.16 613 3.54 656 3.91 736 4.64 814 5.41 888 6.21 958 7.04 1095 8.83 1222 10.710000 3115 561 3.70 609 4.14 651 4.56 692 4.97 769 5.80 839 6.62 909 7.49 975 8.36 1103 10.2 1227 12.3 1344 14.511000 3427 607 4.81 652 5.31 692 5.77 730 6.24 801 7.13 869 8.05 934 8.97 996 9.91 1116 11.9 1229 13.9 1345 16.212000 3738 655 6.15 696 6.68 734 7.20 771 7.72 839 8.72 902 9.70 962 10.7 1021 11.7 1135 13.8 1245 16.0 1346 18.213000 4050 702 7.71 741 8.30 777 8.87 812 9.44 876 10.5 937 11.6 993 12.6 1051 13.7 1156 15.9 1260 18.2 1359 20.6SIZE 22Wheel diameter: 22.3"Wheel circumference: 5.82'Maximum safe speed = 1205 RPMOutlet area: 5.00 sq. ft.CFMOV1⁄4"SP 1⁄2"SP 3⁄4"SP 1"SP 1 1 ⁄2"SP 2"SP 2 1 ⁄2"SP 3"SP 4"SP 5"SP 6"SPRPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP5000 1000 246 0.42 321 0.67 387 0.966500 1300 276 0.72 339 1.02 396 1.34 449 1.70 548 2.488000 1600 309 1.15 365 1.51 415 1.89 462 2.28 552 3.16 632 4.07 710 5.109500 1900 345 1.75 397 2.19 442 2.62 484 3.06 563 3.99 638 5.02 710 6.13 775 7.2611000 2200 383 2.54 430 3.06 472 3.55 511 4.05 583 5.09 651 6.19 717 7.38 777 8.56 894 11.212500 2500 421 3.55 466 4.15 505 4.73 541 5.29 607 6.42 669 7.60 729 8.85 789 10.2 896 12.9 1003 16.014000 2800 461 4.82 502 5.50 539 6.14 574 6.80 636 8.05 693 9.32 750 10.7 802 12.0 907 15.0 1006 18.2 1097 21.515500 3100 501 6.36 540 7.13 575 7.87 607 8.57 666 9.97 721 11.4 773 12.8 825 14.3 920 17.4 1014 20.8 1101 24.217000 3400 542 8.21 578 9.07 612 9.90 642 10.70 699 12.2 751 13.8 800 15.3 848 16.9 938 20.1 1026 23.6 1110 27.318500 3700 583 10.4 617 11.3 649 12.3 678 13.10 732 14.8 782 16.5 830 18.2 874 19.8 960 23.3 1044 27.0 1123 30.820000 4000 624 13.0 657 14.0 687 15.0 715 16.00 768 17.8 816 19.7 859 21.4 903 23.2 984 26.9 1064 30.8 1139 34.7Performance shown is for Single Air Kits with outlet ducts and without inlet ducts. For Double Air Kits, multiply CFM and BHP by 2. BHP does not include belt losses.PAGE 7
Page 1 and 2: BULLETIN 631OCTOBER, 2009SINGLE AND
Page 3 and 4: ACCESSORIESMODIFICATIONS•ACCESS D
Page 5: AIR KIT ENGINEERINGGENERALAir Kits
Page 9 and 10: SIZE 36Wheel diameter: 36.5"Wheel c
Page 11 and 12: NON-STANDARD AIR KITSWhen the syste
Page 13 and 14: NON-STANDARD AIR KITS130X24B-1 SING
Page 15 and 16: DRAWINGS/DIMENSIONS [INCHES] Not to

Single and Double Air Kits - New York Blower

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