Activating The System; Purging The System; Testing The Equipment For Leaks; Selecting And Installing A Tip - Smith Little Torch Owner's Manual

7-4. Activating The System

Open the regulator valves completely by turning knobs clockwise. Notice
the arrows on top of the knobs.

7-5. Purging The System

Always purge gas from the system before lighting torch to pre-
vent a possible mixed-gas explosion. Purge gas in a well venti-
lated area and away from flame or sparks.
1. With the tip removed from the torch, open the torch oxygen valve for
3−4 seconds to purge line.
2. Close the torch oxygen valve.
3. Repeat steps 1 and 2 for the fuel gas.

7-6. Testing The Equipment For Leaks

Use an approved oil-free leak detection fluid to locate possible
leaks.
Do not stand in front of or behind the regulator when opening
the cylinder valve. Never open a cylinder valve suddenly as this
can damage a regulator or cause an oxygen regulator fire.
With the system pressurized and the torch body valves closed, check
every connection and joint from the cylinder valve to the torch tip with an
approved leak detection solution (Figure 1). If leaks are detected, elimi-
nate them before proceeding. If leaks cannot be eliminated, do not put
the equipment into service until it has been repaired or replaced.
.
If the torch is not going to be in use for more than one half hour, turn
the regulator valves to the Off position.

7-7. Selecting And Installing A Tip

1. Fully open the oxygen and fuel gas regulators (turn handles clock-
wise).
2. Select the desired tip. Tip sizes are represented by a number (2−7)
stamped on the copper section. Size 7 produces the largest flame.
.
It is recommended that the size 2 tip not be used for gas other than
acetylene or hydrogen.
3. Install tip and tighten with a wrench. (Do not overtighten.)

7-8. Lighting Procedures (When Using Disposable Cylinders)

Follow the set-up instructions explained in Sections 7-2 thru 7-7 before
lighting the torch.
When lighting torch, keep the tip pointed away from people and
combustibles.
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Figure 1. Testing Equipment For Leaks
161-013