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PPENDIX
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Service Manual
AERATION MANIFOLD FOR PLASMA CUTTING ALUMINUM
Introduction
When plasma arc cutting aluminum at the water table surface or below water, free hydrogen
gas may be generated by the cutting process. The high temperature of the plasma process
causes disassociation of oxygen and hydrogen from the water in the water table. The hot
aluminum, which has a high affinity for oxygen, then combines with the oxygen leaving free
hydrogen.
An effective means of avoiding free hydrogen buildup is to install an aeration manifold on the
floor of the water table to replenish the oxygen content of the water.
Making an Aeration Manifold - Figure c-1
Make an
Aeration Manifold
with two-inch (50 mm) PVC tubing with one-inch (25 mm)
Distribution Lines
connected to it. Drill 1/8 inch (3 mm) holes every six inches (150 mm) in
the distribution lines. Cap the ends of the distribution lines and install the lines so that
oxygen
is delivered to all parts of the cutting area.
Connect the manifold to a shop air line. Set a pressure regulator to obtain a steady stream of
bubbles.
Figure a-1 Aeration Manifold
Regulated air in
Distribution Lines
Aeration Manifold