7
GAS PRESSURE
The adjacent diagrams show minimum pressure losses
along the gas supply line depending on the maximum
burner output operation with natural gas.
Column 1
Gas manifold pressure measured at test point 1)(B),
with:
• Combustion chamber at 0 “WC
• Burner operating at maximum output
• Gas ring 2)(B)p.9 adjusted as indicated in diagram
(C)p.9.
Calculate the approximate maximum output of the
burner thus:
- subtract the combustion chamber pressure from the
gas pressure measured at test point 1)(B).
- Find the nearest pressure value to your result in dia-
gram for the burner in question.
- Read off the corresponding output on the left.
Example - RS 120/M LN:
• Maximum output operation
• Natural gas
• Gas ring 2)(B)p.9 adjust as indicated in diagram
(C)p.9
• Gas pressure at test point 1)(B)
= 5.11 “WC
• Pressure in combustion chamber
= 1.18 “WC
5.11 - 1.18
= 3.93 “WC
A maximum output of 3030 MBtu/hr shown diagrams RS
120/M LN corresponds to 3.93 “WC pressure.
This value serves as a rough guide, the effective deliv-
ery must be measured at the gas meter.
(A)
D2390
(B)
D3182
RS 68/M LN
RS 120/M LN
p
[
“WC
]
p
[
“WC
]
