Questions? Please Contact Your Local Manufacturer’s Representative
SECTION 2 EDR-SOLA-IOM-2022-0216 INSTALLATION
2-13
TABLE 3 SCH 40 PIPE NATURAL GAS CAPACITY
Nominal
Pipe Size
ID Equivalent Pipe Length Max Capacity in ft3 of natural gas per hour. 14”wc pressure.
Pressure drop of 0.5”wc. Equivalent length of pipe (feet)
Inch (mm) Inch (mm) 90 Elb
Feet
(meter)
Tee
Feet
(meter)
20 40 60 80 100 150 200
1-1/4 (31.75) 1.380 (35.05) 3.45 (1.05) 6.9 (2.10) 950 ----- ----- ----- ----- ----- -----
1-1/2 (38.1) 1.610 (40.89) 4.02 (1.22) 8.04 (2.45) 1460 990 810 ----- ----- ----- -----
2 (50.8) 2.067 (52.50) 5.17 (1.57) 10.3 (3.13) 2750 1900 1520 1300 1150 950 800
2-1/2 (63.5) 2.469 (62.71) 6.16 (1.87) 12.3 (3.74) 4350 3000 2400 2050 1850 1500 1280
3 (76.2) 3.068 (77.92) 7.67 (2.33) 15.3 (4.66) 7700 5300 4300 3700 3250 2650 2280
4 (101.6) 4.026 (102.26) 10.10 (3.07) 20.2 (6.15) 15800 10900 8800 7500 6700 5500 4600
6 (152.4) 6.07 (154.17) 10.10 (3.07) 23.60 (7.19) ----- ----- ----- ----- 20200 16503 12766
8 (203.2) 7.98 (202.69) 13.30 (4.05) 29.10 (8.86) ----- ----- ----- ----- 41200 33660 29128
Inlet Gas Pressure
Adhere to the following:
Static inlet gas pressure: Measure while boiler is idle.
Verify pressure is within allowable range.
Dynamic inlet gas pressure: Measure while boiler is in
operation at maximum ring rate. Verify pressure is
within allowable range.
The gas delivery system must provide a stable and
consistent pressure across the entire turndown range,
including light o and idle conditions.
Maximum inlet gas pressure drop from static to
dynamic must not exceed 15%, or the maximum
allowable by local code (CSA B149 clause 6.3.2 for
Canada). The stricter of the two shall apply.
Gas Pressure Requirements
The minimum gas pressure required is 4” W.C. For gas pressures
exceeding 28”W.C. (14”W.C. Canada), a step down regulator
(not supplied) must be installed in the gas supply piping.
Line Gas Pressure Regulation
When inlet gas pressure exceeds 28”W.C. (14”W.C. Canada),
a line gas pressure regulator is required to step the gas
pressure down below maximum pressure.
Proper selection and installation of a gas pressure regulator
is essential in providing conditions for ecient and reliable
combustion. Adhere to the following guidelines when
selecting and installing a gas pressure regulator:
A line pressure regulator listed and labeled to ANSI
Z21.80/CSA 6.22 is recommended. Lock-up is dened
as an outlet pressure not more than 150% or 5”
W.C., whichever is greater, above the setpoint after
a downstream safety shuto valve closes within 2
seconds. Appliance regulators are not a substitution for
line gas pressure regulators and must not be used.
A gas pressure relief valve may be required for
overpressure protection, refer to the local code(s)
adopted by the AHJ.
A sediment trap is recommended prior to the inlet of
the regulator.
If the level of pipe system cleanliness is unacceptable
or unknown, it is recommended that a gas lter be
installed prior to the regulator.
On the outlet of the regulator: Install a straight and
uninterrupted section of pipe matching regulator
connection size with a minimum length of 10 pipe
diameters prior to any valves or ttings.
When installed in close proximity to an appliance,
some regulators may experience oscillation (hunting)
or an outlet pressure spike when demand ends.
Provide adequate volume by locating the regulator
a recommended minimum of 10 total linear feet of
pipe from boiler fuel train inlet. Consult the regulator
manufacturer for installation requirements.
The body size should never be larger than the pipe size.
However, a properly sized regulator may be smaller
than the pipeline.
The inlet pressure used for sizing should be measured
directly at the regulator inlet. Measurements taken at
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