Hired-Hand Super-Savers (Forced Air Heaters) XL: Maywick SS-225-XL Rev 6-09A - Manual (Page 18)

Part No. 4801-5801 Rev. 6-09 Page 18 of 23 Super Saver XL Heater Maywick
Table 1
Minor Loss Equivalents
Fitting 2" (5.08 cm) IPS Or Smaller 2” (5.08 cm) IPS To 4” (10.16 cm) IPS
Feet per fitting Meters per fitting Feet per fitting Meters per fitting
45
° Elbow
3 1 5 2
90
° Elbow
6 2 10 3
Tee 11 4 20 6
Gate Valve 2 1 3 1
Angle Valve 29 9 60 18
Swing Valve 15 5 30 9
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Table 2. Maximum Capacity Of Pipe In Thousands Of BTU per Hour
Nominal Internal Natural Gas (Methane) @ Pressure Drop Of 0.5 in w.c. (0.2 mbar)
Iron Pipe Diameter, Values listed are for 0.6 sp.gr. based on Heat Of Combustion of 1000 BTU/cu .ft
Size, (IPS)
Length Of Pipe, Feet (multiply ft by 0.3 to convert to meter)
Inch* Inch* 10 20 30 40 50 60 70 80 90 100 150 200 250 300
1/2 .622 175 120 97 82 73 66 61 57 53 50 40 35 29 25
3/4 .824 360 250 200 170 151 138 125 118 110 103 84 72 59 53
1 1.049 680 465 375 320 285 260 240 220 205 195 160 135 109 100
1-1/4 1.380 1400 950 770 660 580 530 490 460 430 400 325 280 219 206
1-1/2 1.610 2100 1460 1180 990 900 810 750 690 650 620 500 430 325 309
2 2.067 3950 2750 2200 1900 1680 1520 1400 1300 1220 1150 950 800 614 596
2-1/2 2.469 6300 4350 3520 3000 2650 2400 2250 2050 1950 1850 1500 1280 966 950
3 3.068 11000 7700 6250 5300 4750 4300 3900 3700 3450 3250 2650 2280 1855 1680
4 4.026 23000 15800 12800 10900 9700 8800 8100 7500 7200 6700 5500 4600 3783 3432
Table values given in BTUH/1000. To convert to kW, multiply table values by 0.3
* 1 inch = 25.4 mm
Pipe Sizes Determined For Diagram
Pipe Section Max Gas Capacity Value Determined From Table 2 Pipe Size Determined From Table 2
BTUH kWh inches mm
a-b 280,000 82 1-1/4 in 31.8
b-c 135,000 40 1 in 25.4
b-d 72,000 21 ¾ in 19.1
b-f 72,000 21 ¾ in. 19.1
c-e 72,000 21 ¾ in. 19.1
c-g 72,000 21 ¾ in . 19.1
IMPORTANT
Tables 2 and 3 are based on values given in the Gas Engineers Handbook and are intended as a guide only.
Consult your gas supplier for gas capacity and pipe size information for your particular piping system.
Table 3. Maximum Capacity Of Pipe In Thousands Of BTU per Hour
Nominal Internal Liquid Propane (LP) @ Pressure Drop Of 0.5 in w.c.
Iron Pipe Diameter, Values listed are for 1.6 sp.gr. based on Heat Of Combustion of 2500 BTU/cu .ft
Size, (IPS)
Length Of Pipe, Feet (multiply ft by 0.3 to convert to meter)
Inch* Inch* 10 20 30 40 50 60 80 100 125 150 200 250 300 350 400
1/2 .622 291 200 161 137 122 110 94 84 74 67 58 51 46 43 40
3/4 .824 608 418 336 287 255 231 198 175 155 141 120 107 97 89 83
1 1.049 1146 788 632 541 480 435 372 330 292 265 227 201 182 167 156
1-1/4 1.380 2353 1617 1299 1111 985 892 764 677 600 544 465 412 374 344 320
1-1/2 1.610 3525 2423 1946 1665 1476 1337 1144 1014 899 815 697 618 560 515 479
2 2.067 6789 4666 3747 3207 2842 2575 2204 1954 1731 1569 1343 1190 1078 992 923
Table values given in BTUH/1000. To convert to kW, multiply table values by 0.3.
* 1 inch = 25.4 mm