Installation Guide

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• For natural gas with a specic gravity of 0.60, one cubic foot per hour (1

CFH) is approximately 1,000 BTUH.

• For LP gas with a specic gravity of 1.52, one cubic foot per hour (1 CFH)

is approximately 2,500 BTUH.

For any given system and its load requirements, there are several piping system designs

available to the installer using HOME-FLEX® tubing. The sections below will outline several

demand scenarios and the dierent system options open to the installer. It would be impos-

sible to outline all the possible installation methods. It is the installer’s responsibility to use

the information supplied here to determine the best routing solution, using these examples

as a guide.

Low Pressure Systems

In low pressure systems, there are two installation options: series layouts where a main run

from the gas source splits to each appliance, and parallel layouts where the main run from the

gas source leads to a central distribution manifold from

which individual runs service the appliances.

Low Pressure Series Systems

Series systems are the most commonly used layout for

black steel pipe installations with low pressure supplies. In

series layouts, a main run from the gas source is branched

with tees to each appliance. The service pressure down-

stream of the meter is typically less than ½ PSI.

It is important to consider

the minimum pressure

supplied to any given

appliance in a series layout.

Most natural gas appli-

ances require a minimum

of 4" w.c. pressure, while LP

appliances require a mini-

mum of 10" w.c. pressure.

Local code restrictions may

dictate allowable pressure

drop along any particular

run.

Low Pressure Parallel

Systems

Parallel systems have a

central distribution mani-

fold with branch runs to

the appliances. Typically, a

main supply line is run

from the gas supply to a

manifold and "home runs"

are routed to each appli-

ance location. Manifold

stations are located as

close as possible to the

appliance(s) with the

greatest load. Parallel lay-

outs are most commonly

used in ¼ to ½ PSI systems.

Appliance Shut-off Valve

Shut-off Valve

Pressure Regulator

Manifold

Figure 3.1 Routing Diagram Key

Gas

Meter

Water

Heater

25,000 BTUH

Range Oven

40,000 BTUH

Low Pressure

(5 - 7" w.c.)

Figure 3.2 A low pressure series layout

Gas