Gas Pressure - Riello RLS 28 Installation, Use And Maintenance Manual

∆p (" WC)
RLS 28
MBtu/hr Natural gas
616 2.56
700 2.68
796 2.87
890 3.15
985 3.43
1079 3.78
1174 4.09
1232 4.33
∆p (" WC)
RLS 38
MBtu/hr Natural gas
882 3.46
985 3.58
1098 3.70
1212 3.86
1325 4.09
1440 4.37
1553 4.65
1666 5.11
∆p (" WC)
RLS 50
MBtu/hr Natural gas
1092 3.94
1250 4.02
1401 4.13
1553 4.25
1704 4.45
1856 4.61
2007 5.00
2198 5.51
(A)
(B)

GAS PRESSURE

The adjacent tables show minimum pressure losses at
combustion head depending on the burner output at
high fire.
Gas pressure measured at test point 1)(B), with:
• Combustion chamber at 0" WC
• Burner operating at high fire
• Natural gas
Calculate the approximate high fire output of the burner
as follows:
- subtract the combustion chamber pressure from the
- Find the nearest pressure value to your result in the
- Read off the corresponding output on the left.
Example - RLS 28
• High fire operation
• Natural gas
• Gas pressure at test point 1)(B)
• Pressure in combustion chamber = 0.79" WC
A high fire ouput of 796 MBtu/hr shown in table RLS 28
corresponds to 2.87" WC pressure, natural gas.
This value serves as a rough guide, the effective delivery
must be measured at the gas meter.
To calculate the required gas pressure at test point
1)(B), set the output required from the burner in high fire
operation:
- find the nearest output value in the table for the burner
- Read off the pressure at test point 1)(B).
- Add this value to the estimated pressure in the com-
Example - RLS 28
• Required burner output in high fire operation:
• Natural gas
• Gas pressure at burner output of 796 MBtu/hr, taken
• Pressure in combustion chamber
D2545
11
gas pressure measured at test point 1)(B).
table for the burner in question.
3.66 - 0.79 = 2.87" WC
in question.
bustion chamber.
796 MBtu/hr
from table RLS 28, natural gas
2.87 + 0.79
pressure required at test point 1)(B).
= 3.66" WC
= 2.87" WC
= 0.79" WC
= 3.66" WC