Beckett CG10-24, Manual

Page: 16 / 36

Section: CONNECT GAS TRAIN PIPING
16
TP
TC TC
LGPS HGPS
SSOV1 PRSSOV MLTC U U MSC
When pressure reducing safety shutoff valves are
used, the distance from the final shutoff valve
(PRSSOV) to the burner manifold must be kept to a minimum for good light-off
reliability. R.W. Beckett recommends the following maximum lengths. When
two shut-off valves are used, the distance between valves should not exceed
the max. length specified below:
Pipe Size
3/4”
1”
1-1/4”
1-1/2”
2”
Max. Length
12”
12”
15”
18”
24”
If a Normally Open Vent Valve (not shown) is used, the distance between the
SSOVs must be kept to a minimum using the shortest practical nipples.
Key
( Figure 10 thru Figure 12 )
Abbrev. Item Description
CGV
HGPS
LGPS
MSC
MLTC
PRSSOV
PRV
SSOV1
SSOV2
TC
TP
U
Combination Gas Valve
High Gas Pressure Switch
Low Gas Pressure Switch
Main Shutoff Cock
Main Leak Test Cock
Pressure Regulating Safety Shutoff Valve
Regulator
Safety Shutoff Valve #1
Safety Shutoff Valve #2
Test Cock
Test Port
Union
TP
TC TC
HGPS
PRV SSOV1 MLTC U U MSC
TP
TC TC
LGPS HGPS
CGV
MLTC U U MSC
LGPS
SSOV2
Max. Distance
(see Notice below)
Max Distance
(see Notice below)
Figure 10 – Gas train configuration for On/Off with Low Fire Start
Figure 11 – Gas train configuration for On/Off operation
Figure 12 –
Gas train configuration for On/Off operation under 399 MBH
Max. Length
(see Notice below)
Burner Manifold
Max. Length
(see Notice below)
Burner Manifold
Max. Length
(see Notice below)
Burner Manifold