750-91 (revised 2009)
Model CB-LE Packaged Boiler Manual
6-13
6.16 — Gas Pressure and Flow Information
The pressure required at the entrance to the burner gas train for rated boiler output is termed “net regulated pres-
sure.” The gas pressure regulator must be adjusted to achieve the pressure to assure full input.
FIGURE 6-6. Minimum Net Regulated Gas Pressure for Rated Boiler Output
The pressure requirement varies with boiler size, altitude, and type of gas train. The pressures listed are based on
1000 Btu/cu. ft. natural gas at elevations up to 700 feet above sea level. For installation at higher altitudes, multiply
the selected pressure by the proper factor from Figure 6-7.
FIGURE 6-7. Pressure/Altitude Correction Factors
Pressure Required at Gas Train Entrance with Two Valves and 3” Pipe
Boiler HP Standard HTB LE
250 17.5” WC 22.0” WC 23.0” WC
300 23.0” WC 31.0” WC 32.5” WC
350 32.5” WC 42.5” WC 45.0” WC
Altitude
Feet Above Sea Level Correction Factor
1000 1.04
2000 1.07
2500 1.09
3000 1.11
4000 1.16
5000 1.21
6000 1.25
7000 1.30
8000 1.35
9000 1.40
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