Part
No.
4801-5801
Rev.
4-2010
Page
19
of
24
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
-
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
