8
After the piping and meter have been checked completely, purge the system of air. Do not bleed the air inside the furnace.
Be sure to relight all the gas pilots on other appliances.
PURGING
After the piping has been checked, all piping and appliances receiving gas through the meter shall be fully purged. A
suggested method for purging the gas line to the burner is to disconnect the pilot line at the outlet of the pilot valve. Under no
circumstances shall the line be purged into the combustion chamber.
After the gas line to the conversion burner has been fully purged and the pilot line reconnected, the gas supply at other pilot
burners located on other gas appliances which were extinguished as the result of interrupted service shall be reignited.
LENGTH OF STANDARD PIPE THREADS inches (mm)
EFFECTIVE
OVERALL
PIPE SIZE
LENGTH
LENGTH
OF THREAD
OF THREAD
3/8 (9.525)
3/8 (9.525)
9/16 (14.29)
1/2 (12.7)
1/2 (12.7)
3/4 (19.05)
3/4 (19.05)
1/2 - 9/16 (14.29)
13/16 (20.64)
1 (25.4)
9/16 (14.29)
1 (25.4)
PIPE CAPACITY TABLE
Nominal Diameter of Pipe in Inches (mm)
3/4 (19.05)
1(25.4)
1-1/4 (31.75) 1-1/2 (38.1)
2 (50.8)
Length
of Pipe
Capacity - Cu, Ft. (m3)Per Hr. with a 0.6
in Feet (Meter) Sp. Gr. Gas and Press. Drop of 0.3 In. (74.72 Pa) Water Col.
15 (4.572)
172
345
750
30 (9.144)
120
241
535
850
45 (13.72)
99
199
435
700
60 (18.29)
86
173
380
610
75 (22.86)
77
155
345
545
105 (32)
65
131
285
450
920
120 (36.58)
120
270
420
860
180 (54.86)
100
225
350
720
FIGURE 8
To convert the figures given above to capacities for another
gas of different specific gravity, multiply the tabular values by
the multiplier shown below.
MULTIPLIER FOR VARIOUS
SPECIFIC GRAVITIES
SPECIFIC
SPECIFIC
GRAVITY
MULTIPLIER
GRAVITY
MULTIPLIER
.35
1.31
1.00
.775
.40
1.23
1.10
.740
.45
1.16
1.20
.707
.50
1.10
1.30
.680
.55
1.04
1.40
.655
.60
1.00
1.50
.633
.65
.962
1.60
.612
.70
.926
1.70
.594
.75
.895
1.80
.577
.80
.867
1.90
.565
.90
.817
2.10
.535
1/8” (3.175mm) N.P.T. PLUGGED TAPPING
PRESSURE GAUGE PORT
3” MINIMUM
(76.2MM)
