FULTON VSRT Series Installation, Operation And Maintenance Manual page 42

INSTALLATION
ƒ
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.
ƒ
The body size should never be larger than the pipe size.
However, a properly sized regulator may be smaller
than the pipeline.
ƒ
The inlet pressure used for sizing should be measured
directly at the regulator inlet. Measurements taken at
any other point may be subject to losses associated
with upstream piping.
ƒ
Consult the regulator manufacturer for orifice selection.
ƒ
If two or more springs are available for a particular
outlet pressure in the desired range use the spring with
the lower range for better accuracy.
–
NOTE: Regulators are not intended for use as "shut off"
devices. As per ANSI Z21.80/CSA 6.22 lock-up is defined as an
outlet pressure not more than 150% or 5" W.C., whichever is
greater, above the setpoint after a downstream safety shutoff
valve closes within 2 seconds.
ƒ
Appliance regulators must not be used as line gas
pressure regulators to step down the gas pressure. For
additional information regarding gas regulator selection
and installation consult your regulator manufacturer,
Nominal ID
Pipe Size
Inch (mm) Inch (mm)
1.25 (31.75) 1.380 (35.05)
1.5 (38.1) 1.610 (40.89)
2 (50.8) 2.067 (52.50)
2.5 (63.5) 2.469 (62.71)
3 (76.2) 3.068 (77.92)
4 (101.6) 4.026 (102.26)
6 (152.4) 6.07 (154.17)
8 (203.2) 7.98 (202.69)
2-32
TABLE 5 - SCH 40 PIPE NATURAL GAS CAPACITY
Equivalent Pipe Length
90 Elb Tee
Feet Feet
(meter) (meter)
3.45 (1.05) 6.9 (2.10)
4.02 (1.22) 8.04 (2.45)
5.17 (1.57) 10.3 (3.13)
6.16 (1.87) 12.3 (3.74)
7.67 (2.33) 15.3 (4.66)
10.10 (3.07) 20.2 (6.15)
10.10 (3.07) 23.60 (7.19) -----
13.30 (4.05) 29.10 (8.86) -----
any applicable local codes or ordinances, the standard
for line pressure regulators ANSI Z21.80/CSA 6.22, and
The National Fuel Gas Code NFPA 54/ANSI Z223.1.
ƒ Gas Piping Installation
Adhere to the following for gas piping installation:
1. See Table 5 for required natural gas pipe size, based on
overall length of pipe from the meter plus equivalent
length of all fittings. Approximate sizing may be based
on 1,020 BTU for 1 cubic foot of natural gas.
2. Install a manual gas shutoff valve (not supplied) prior to
the boiler.
3. Piping must be installed such that no piping stresses
are transmitted to the boiler. The boiler cannot be used
as a pipe anchor.
4. All gas piping connections must be pressure-tested and
checked for leaks before being placed into service. Test
with compressed air or inert gas if possible.
5. The boiler gas train must be disconnected at the boiler
manual shutoff valve from the gas supply piping system
during any pressure testing of the system at pressures
in excess of 1/2 psig (13.8 in wc) for models 9.5-125 and
5 PSIG for VSRT-250.
6. Gas Piping must be installed in accordance with
National Fuel Gas Code, ANSI Z223.1 1991 or latest
addenda and any other local codes, which may apply.
Max Capacity in ft3 of natural gas per hour at 14" WC pressure.
Pressure drop of 0.5" WC. Equivalent length of pipe (feet)
20 40 60
950 ----- -----
1460 990 810
2750 1900 1520
4350 3000 2400
7700 5300 4300
15800 10900 8800
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SECTION 2
VSRT-IOM-2022-0728
80 100 150
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1300 1150 950
2050 1850 1500
3700 3250 2650
7500 6700 5500
----- 20200 16503
----- 41200 33660
© Fulton Group N.A., Inc. 2022
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