All installations and services must be performed by qualified service personnel.
EXAMPLE: A line must supply a furnace of 110,000 BTU/hr input, a hot water heater of 40,000 BTU/hr input and gas range with a 30,000 BTU/hr input capacity. The total BTU/hr input loading on the line is 180,000 BTU/hr. The 200,000 BTU/hr column on the chart must be used in sizing the pipe.
- BLACK PIPE SIZE FOR NATURAL GAS -
┌─────────────┬────────────────────────────────────────────────┐
│BURNER FIRING│ | FEET OF PIPE FROM METER TO BURNER | │ | |||
│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
├─────────────┼─────────┼─────────┼─────────┼─────────┼────────┤
│200,000 │1 │1
├─────────────┼─────────┼─────────┼─────────┼─────────┼────────┤
│250,000 │1 │1
├─────────────┼─────────┼─────────┼─────────┼─────────┼────────┤
│300,000 │1 │1
└─────────────┴─────────┴─────────┴─────────┴─────────┴────────┘
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 only. 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" wc and minimum supply for purpose of input adjustment is
J. INSTALLATION OF LIQUIFIED PETROLEUM GAS (LP) PIPING
1.Experience has proved 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 lbs.) down to 11" wc. Varying pressures will occur at the appliances as outside temperatures and usage demands vary. Two stage regulations are the only effective method of controlling these variables.
TYPICAL PIPING FOR TWO STAGE REGULATION
NOTE: Two stage regulation must be installed for liquified petroleum gas when used with any Thermo Pride LP furnace. See illustration above of a typical two stage piping system.
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