Table of Contents
Advertisement
Figure 7. Typical Gas Piping Layout
ABBREV.
ITEM
DESCRIPTION
HGPS
HIGH GAS PRESSURE
SWITCH
LGPS
LOW GAS PRESSURE
SWITCH
MSC
MAIN SHUTOFF
COCK
MLTC
MAIN LEAK TEST COCK
PG
PRESSURE
GAUGE
S
STRAINER
SSOVl
SAFETY
SHUTOFF
VALVE #1
TO
TEST COCK
U
UNION
2PRV
TWO POSITION
REGULATING
VALVE
LGPS
HGPS
DRiP LEG
S
(IF USED)
Table 1. Gas supply
piping capacity
30
5O
70
9O
125
175
152
115
96
84
72
59
285
215
180
160
130
110
590
44O
370
320
275
225
800
670
560
490
410
350
1650
1270
1050
930
780
65O
2700
2000
1700
1500
1250
1050
47O0
3600
3000
2600
2200
1850
97O0
74O0
6200
54OO
4500
3800
Install
a Drip Leg in
Gas Supply
Piping
Foreign
matter
could
lodge
in gas
valve cutoff
seals,
resulting
in gas
leak-through,
explosion
or fire.
Install a full-size drip leg or dirt pocket in the piping di-
rectly ahead of the main shutoff valve to capture foreign
matter.
Gas
Trains
Standard-An
Underwriters Laboratories (UL)listed gas
train is standard for the CGI0 gas burner. This configu-
ration also meets CSD-1 requirements.
See Figure 8 for
typical component layout.
Optional
- Gas trains for IRI and FM are available and
must be specified when ordering a burner.
Verify - Verify that the train components are not dam-
aged and all piping and fittings are clean inside and out.
The gas train is normally shipped as components
and
must be assembled and installed at the site.
Vent lines - Install vent lines to any gas valve compo-
nent that requires atmospheric
air pressure to balance
a diaphragm.
Vent lines must be run to the outdoors,
with the termination point away from fresh air intakes and
windows. The terminal opening must be fitted with a wire
mesh screen to block insects and other contaminants
from entering the vent and must be mounted in such a
position that water, ice, dirt, or any other foreign matter
cannot infiltrate and block the vent piping. Make sure the
final assembly is anchored securely.
11O
61 04 BCG10
RoB
Advertisement
Table of Contents
