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Operations

Pipe Sizing Chart for Natural Gas

The following chart is based on gas pressure in the
range 0-0.5 psi, specific gravity of 0.6 and pressure
loss of 0.5" W.C. Numbers are for straight schedule 40
pipe; fittings further reduce capacity. For example, in 1"
size, an elbow is equivalent to about 2.6 feet of pipe
and a tee is equivalent to about 5.2 feet of pipe.

Maximum capacity of pipe in cubic feet/hr of natural
gas (Multiply values by 1000 to get nominal BTU/hr
capacity.

LP-Gas (Liquid petroleum gas or propane)

LP-gas is gas compressed into liquid form for easy
transportation and storage. It is also known as propane
or bottle gas. (Propane tanks are not supplied with this
equipment.)

LP-gas is flammable, is always contained under
pressure and the liquid can freeze skin. Therefore, in
the interest of safety, it is important to understand the
basic facts about LP-gas and LP-gas containers.

Federal DOT (Department of Transportation) regula-
tions require periodic inspections and re-qualifications
of cylinders. DO NOT USE damaged or rusted
containers.

DO NOT store LP-gas containers indoors or in
enclosed areas. Do not expose LP-gas container to
heat. Always store with service valve closed and
plugged as required.

CAUTION: Use LP-gas containers in proper
position.

Most LP-gas pressure washer heaters are designed to
operate on LP-gas vapor only. Therefore, all LP-gas
containers designed for vapor service must be trans-

ported, installed and used in the proper position. Do not
transport, install or use a vertical cylinder in a horizontal
or upside down position. Proper care must be taken to
position a horizontal container in the correct position for
vapor withdrawal. Liquid LP-gas could enter the
system designed for vapor only, possibly creating a
hazardous condition.

Always use a POL plug installed on a POL valve or a
dust cap on an ACME/Type 1 valve when transporting
or storing disconnected containers (full or empty).
Check for leaks after connecting. Apply approved leak
detector solution to connection, turn off all burners and
pilots and open service valve. Leaks will be detected by
the growth of bubbles. If bubbles grow, tighten or repair
the connection as needed. Repeat leak test until
problem is corrected.

Check all tank and the line connections periodically to
be sure they are tight. When testing for leaks, use
approved leak detector solution — not matches.

Improved Regulation:

The second stage regulator

receives a relatively uniform pressure from the first
stage regulator. This helps the second stage regulator
to maintain appliance pressure at a nearly constant 11"
W.C.

Filling the LP-Gas Container

Only qualified persons should fill your LP-gas
containers.

CAUTION: Overfilling is hazardous!

DO NOT allow your LP-gas container to be overfilled.
Stop filling when liquid appears at the fixed level gauge.
Bleed off excess propane in a safe area. Most LP-gas
containers are equipped with a fixed liquid level gauge
which contacts the liquid level at 80% of container
capacity, allowing 20% for expansion. LP-gas
containers not equipped with a fixed liquid level gauge
can only be filled by weight.

In cold climates, in order to keep vaporization of LP-gas
at the highest level, keep the fuel levels above 50%.

Propane Tank Disposal:

Propane tanks present a real danger in the waste
stream, so it is essential to properly dispose of old
tanks so they do not injure you or sanitation workers.
The best way to dispose of unused propane tanks is by
calling a propane company to pick it up. Propane tanks
are not picked up by garbage collectors, and improper
disposal is illegal in some areas. If a propane tank is
unfit for service, one should contact a propane
company.

Landa VNG Operator’s Manual 8.913-939.0 - AB

Length of

Pipe (ft.)

Iron Pipe Size

3/4"

1 -1/4" 1- 1/2"

360

680

1400

2100

3950

250