f.
Solenoid shutoff valve to close when the burner shuts off.
g.
One self-contained pressure regulating valve to maintain atomizing
air pressure.
h.
Low atomization air pressure switch.
2.4.9.4
Natural Gas Trains
a.
NFPA 54.
b.
Natural gas flow control valve with characterizing adjustments to
match airflow.
c.
Manual shut-off valve (NO) at supply and discharge of vent and
d.
Manual shut-off valve (NO) at ignitor natural gas supply and
discharge of vent and drain valve.
e.
Y-type strainer supplied in ignitor natural gas and main natural
gas lines.
f.
Two (NC) solenoid safety shut-off valves, in series, in ignitor
line with one (NO) solenoid vent valve located between safety
shut-off valves, piped to atmosphere through the roof.
g.
Two shut-off valves with proof of closure, piped in series in main
gas line with one (NO) solenoid vent valve located between safety
shut-off valves, piped to atmosphere through the roof.
h.
One pressure regulating valve in ignitor natural gas line to
regulate natural gas pressure to ignitor.
i.
One pressure regulating valve to regulate main natural gas
pressure at natural gas train inlet.
j.
Natural gas meter.
k.
Natural gas flow transmitter for main natural gas to burner.
l.
Pressure gauge, with shut-off valve for main natural gas supply.
m.
Pressure gauge, with shut-off valve for main natural gas at burner.
n.
Pressure gauge, with shut-off valve for natural gas supply to
ignitor.
o.
Pressure gauge, with shut-off valve for natural gas ignitor.
p.
Low natural gas pressure switch.
p.
High natural gas pressure switch.
2.5
CONTROLS
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NOTE: This paragraph specifies several levels of
SECTION 15561A
Page 40
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