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2. Gas Systems
Illustrated Gas Trains by Capacity and Code: The following illustrations show the Webster configuration for
UL, FM and IRI as grouped by UL capacity ratings. Refer to the legend below for component part identification.
These illustrations are not to be used for field erection and/or system design purposes.
UL Capacity Range
BTU/Hr.
To 2,500,000
2,500,001
to 5,000,000
5,000,001
to 12,500,000
12,500,001
and Up
UL-FM Modulation Gas Piping Diagram - Up To 2,500 MBH Firing Rate
722166
UL Modulation Gas Piping Diagram - 2,500 To 5,000 MBH Firing Rate
722167
SC Manual
Operation Mode
Designation
Modulating
Modulating
Modulating
Modulating
Modulating
Modulating
Modulating
Webster
Code
UL
M
X
M
X
M
X
M
M
M
X
M
Page 16
Illustration
FM
X
722166
722167
X
722168
722169
X
722170
722171
X
722172
Fuel Systems
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