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Paint gives an early warning
Immediate, visual detection of dangerous spray-outs in critical areas in process systems such as pipe flanges, valves, weld sites and sample ports is the main benefit of On-Guard, an acid alert paint from Allison Engineering.
On-Guard is a modified alkyd acid indicating paint which has been formulated and patented for industrial use. Early warning of the potential dangers resulting from leaks ensures important protection for employees, expensive process equipment and the environment.
On-Guard is applied like any other exterior paint to 4mm dry thickness, which equates to two to three brush strokes, using a brush or roller. Spraying is also an option. A primer coat is required if applied to a raw metal, otherwise it can be applied over existing paint — surfaces need to be dry, clean and oil free. If acids or acid vapours pH3 or below escape, On-Guard will instantly change colour from its golden yellow to a vibrant red alerting operatives to the potential dangers.
Once the leak is contained and repaired the painted surface is flushed with water and a neutralising solution applied. After a minute or so, the red disappears leaving the On-Guard paint in its original yellow colour, with no requirement for a new coating of On-Guard until at least five exposures to acid.
On-Guard is designed to be effective for at least two years when used outside.