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34<br />
LP-<strong>Gas</strong> Regulators<br />
5. Find the line on the chart corresponding to the anticipated inlet<br />
pressure.<br />
6. Draw a vertical line upward from the point of assumed load<br />
(250,000 BTUs per hour) to intersect with the line corresponding<br />
to the lowest inlet pressure.<br />
7. Read horizontally from the intersection of these lines to the<br />
delivery pressure at the left side of the chart. In this example<br />
the delivery pressure will read 10.6” w.c.. Since the delivery<br />
pressure will be 10.6” w.c. at the maximum load condition and<br />
lowest anticipated inlet pressure, the regulator is sized properly<br />
for the demand.<br />
LV4403B Series Second Stage Regulator<br />
Delivery Pressure<br />
Inches of Water Column<br />
13<br />
12<br />
11<br />
10<br />
9<br />
8<br />
CFH/hr.<br />
BTU/hr.<br />
Initial Setting<br />
5 PSIG Inlet<br />
100<br />
250,000<br />
8 PSIG Inlet<br />
10 PSIG Inlet<br />
200<br />
300<br />
500,000 750,000<br />
Flow Rate<br />
15 PSIG Inlet<br />
400<br />
1,000,000<br />
500<br />
1,250,000<br />
Leak Testing the Installation<br />
According to NFPA 54:<br />
A leak test should be performed on new installation and on<br />
existing systems that are being placed back into service. The test<br />
should include all piping, fittings, regulators, and control valves<br />
in the system.<br />
Over the years, the pressure test and leak test have been<br />
confused with each other. A pressure test is required for<br />
new piping installation and additions to piping installation,<br />
while a leak test is required whenever the gas system is<br />
initially placed into service, or when the gas is turned back<br />
on after being turned off. In this handbook we discuss<br />
the leak test only. For further information regarding the<br />
pressure test, consult NFPA 54, 1999, 4.1.