Hired-Hand Super-Savers (Forced Air Heaters) XL: Maywick SS-225-XL Rev 6-09 - Manual (Page 17)

Part No. 4801-5800 Rev. 6-09 Page 17 of 21 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
1 1 5 2
90
° Elbow
2 2 10 3
Tee 4 4 20 6
Gate Valve 1 1 3 1
Angle Valve 9 9 60 18
Swing Valve 5 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
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 70 80 90 100 125 150
1/2 .622 275 189 152 129 114 103 96 89 83 78 69 63
3/4 .824 567 393 315 267 237 217 196 185 173 162 146 132
1 1.049 1071 732 590 504 448 109 378 346 322 307 275 252
1-1/4 1.380 2205 1496 1212 1039 913 834 771 724 677 630 567 511
1-1/2 1.610 3307 2299 1858 1559 1417 1275 1181 1086 1023 976 866 787
2 2.067 6221 4331 3465 2992 2646 2394 2205 2047 1921 1811 1606 1496
Table values given in BTUH/1000. To convert to kW, multiply table values by 0.3.
* 1 inch = 25.4 mm
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.