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All installations and services must be performed by qualified service personnel.
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TABLE 4: Steel Pipe Size for Natural Gas (IPS)
Feet of Pipe From Meter to Burner Burner
Firing Rate,
BTU/Hr
10 20 30 40 50
50,000 1/2 1/2 3/4 3/4 3/4
100,000 3/4 3/4 3/4 3/4 1
150,000 3/4 1 1 1 1-1/4
200,000 1 1 1-1/4 1-1/4 1-1/4
250,000 1 1 1-1/4 1-1/4 1-1/4
300,000 1 1 1-1/4 1-1/4 1-1/4
All black pipe sizes shown are nominal iron pipe sizes.
Use black iron steel pipe and malleable iron fittings for natural gas service lines.
Provide rigid supports for the pipe. If the pipe size must be reduced, use
reducing couplings when possible. Avoid the use of reducing bushings. Remove
all burrs and inspect the pipe for dirt or other foreign material prior to connecting.
Maximum supply pressure for natural gas is 14.0 in. W.C. and minimum supply
for purpose of input adjustment is 4.5 in. W.C.
2. INSTALLATION OF PROPANE GAS PIPING
:
• Copper and brass tubing and fittings (except tin lined) shall not
be used if the gas contains more than a trace (0.3 grains per 100
cubic ft.) of hydrogen sulfide gas. Check with your gas supplier.
Maximum supply pressure for propane gas is 14.0 in. W.C. and the minimum
supply for purpose of input adjustment is 11.0 in. W.C.
Experience has proven that the pressure drop in the gas line running from the
outside propane gas tank to the gas appliances in a home is the most frequent
cause of equipment malfunctions. A single pressure regulator, located at the
tank, will not reliably regulate the high tank pressures (up to 200 PSIG.) down to
11.0 in. W.C. Varying pressures will occur at the appliances as outside
temperatures and usage demands vary. Two-stage regulation is the only
effective method of controlling gas pressure (refer Figure 7).