Hypertherm HT4001 Plasma Arc Cutting System - Manual (Page 235)

APPENDIX B
b-2
HT4001
Instruction Manual
Aeration Manifold for Plasma Cutting Aluminum
Introduction
When plasma arc cutting aluminum, 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 b-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.
Aeration Manifold
Distribution Lines
Regulated air in
Figure b-1 Aeration Manifold