Hired-Hand Super-Savers (Forced Air Heaters) XL: SS-225-XL - Manual (Page 21)

4801-5101 Rev 6-09 Page 21 of 26 Super Saver XL CE Heater
IMPORTANT !
Tables 3 and 4 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.
4. In the appropriate table, NG (Table 3) or LP
(Table 4), select the column showing the ELOP
or the next longer length if the table does not
give the exact length. Use this column to
compare table values to the HVR values. In this
example, the Natural Gas (NG) table is selected.
From step 3, ELOP = 60 m. Locate the column
labeled 60 m in Table 3.
5. Select a pipe section and read down the ELOP
column to find the maximum gas capacity that
matches the HVR for that pipe section. If the
exact figure is not shown, choose the next larger
figure in the column. In this example, start with
pipe section c-e. For pipe section c-e, HVR = 12
kW. Since 12 kW is not listed, read the next
higher value from the table. The next higher
value is 21.
6. Follow the row leftward until you reach the
column labeled ‘Nominal Iron Pipe Size’, or
‘Internal Diameter’, and read the number of the
pipe size for the particular pipe section.
Example: For pipe section c-e, the iron pipe size
is 19.1 mm (3/4 in.) (Table 3: Locate 21 in the 60
m column, read left).
7. Repeat steps 5-6 for each pipe section in the
system. Use 60 m column for all readings.
Example: The table ‘Pipe Sizes Determined For
Arbitrary Piping System’, summarizes the pipe
sizes determined in this example.
Table 3. Maximum Capacity Of Pipe In kWh (kilowatt hour)
Nominal Internal
Natural Gas (Methane) @ Pressure Drop Of 0.20 mbar (0.08 in. w.c.)
Iron Pipe
Size
Diameter Values listed are for 0.6 sp.gr. based on Heat Of Combustion of 10.2 kWh/m
3
(IPS)
Length Of Pipe, meters
m in. mm in. 3 6 9 12 15 18 21 24 27 31 46 60 75 90
12.7 .5 15.8 .622 51 35 28 24 22 19 18 17 15 14 12 10 8 7
19.1 .75 20.9 .824 106 73 59 50 44 40 37 35 32 30 25 21 17 16
25.4 1 26.7 1.05 199 138 110 94 84 76 70 65 60 57 47 40 32 29
31.8 1.25 35.1 1.38 410 278 226 193 170 155 144 135 126 117 95 82 64 60
38.1 1.5 40.9 1.61 615 427 346 290 264 237 220 202 190 182 146 126 95 90
50.8 2 52.6 2.07 1158 806 645 556 492 445 410 380 357 337 278 234 180 175
63.5 2.5 62.7 2.47 1846 1275 1032 879 776 703 659 600 571 542 439 375 283 278
76.2 3 78.0 3.07 3223 2256 1831 1554 1392 1260 1143 1084 1011 952 776 668 544 492
102 4 102 4.03 6741 4630 3751 3195 2843 2579 2374 3198 2110 1964 1611 1348 1109 1005
Table 4. Maximum Capacity Of Pipe In kWh (kilowatt hour)
Nominal Internal
Liquid Propane (LP) @ Pressure Drop Of 0.20 mbar (0.08 in. w.c.)
Iron Pipe Diameter Values listed are for 1.6 sp.gr. based on Heat Of Combustion of 25.8 kWh/m
3
Size (IPS)
Length Of Pipe, meters
mm in. mm in. 3 6 9 12 15 18 21 24 27 31 38 46
12.7 .5 15.8 0.622 275 189 152 129 114 103 96 89 83 78 69 63
19.1 .75 20.9 0.824 567 393 315 267 237 217 196 185 173 162 146 132
25.4 1 26.6 1.049 1071 732 590 504 448 109 378 346 322 307 275 252
31.8 1.25 35.0 1.380 2205 1496 1212 1039 913 834 771 724 677 630 567 511
38.1 1.5 40.9 1.610 3307 2299 1858 1559 1417 1275 1181 1086 1023 976 866 787
50.8 2 52.5 2.067 6221 4331 3465 2992 2646 2394 2205 2047 1921 1811 1606 1496
Pipe Sizes Determined For Arbitrary Piping System
Pipe Section
HVR Value
(from step 2)
Closest value from Table
3
Pipe Size Determined
From Table 3
a-b 48 82 31.8 mm (1-1/4 in.)
b-c 24 40 25.4 mm (1 in.)
b-d 12 21 19.1 mm (3/4 in.)
b-f 12 21 19.1 mm (3/4 in.)
c-e 12 21 19.1 mm (3/4 in.)
c-g 12 21 19.1 mm (3/4 in.)