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Table 2 -- Maximum Gas Flow Capacity*
NOMINAL
INTERNAL
LENGTH OF PIPE, FTI"
IRON PIPE,
DIAMETER
SIZE
(in.)
(in.)
10
20
30
40
50
60
70
80
90
100
125
150
175
200
I/2
.622
175
120
97
82
73
66
61
57
53
50
44
40
--
--
3/4
.824
360
250
200
170
15!
138
125
118
!10
103
93
84
77
72
1
1.049
680
465
375
320
285
260
240
220
205
195
175
160
145
!35
11/4
1.380
1400
950
770
600
580
530
490
460
430
400
360
325
300
280
11/2
1.610
2100
!460
1180
990
900
8!0
750
690
650
620
550
500
460
430
*Capacity of pipe in cu ft of gas per hr for gas pressure of 0.5 psig or less. Pressure drop of 0.5-in. wg (based on
a 0.60 specific gravity gas). Refer to Table C-4, National Fire Protection Association
NFPA 54.
1-This length includes an ordinary number of fittings.
SUPPLY
DUCT
OPENING
RETURN
DUCT
OPENING
Fig.
12 -- Supply
and
Return
Duct
Openings
Fig. 14 -- Vertical Duct Cover Removed
Fig. 13 -- Lance Location for Vertical Duct
Opening Cover
Fig. 15-
Removal of Vertical Discharge
Opening
Cover
--12--
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