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How to Know if Your Blast Nozzle Needs Replacing
Here are some things to look for to understand if you need to replace your blast nozzle.
Has the blasting performance deteriorated?
The nozzle should be checked on a regular basis to make sure that the nozzle gasket is in good condition and that there is no foreign debris caught in the nozzle cone. Debris may redirect the path of the abrasive and possibly cause nozzle damage.
During inspection of the nozzle, use the shank of a drill-bit with a flashlight shining from the opposite end of the nozzle, to determine a loose fit - which indicates that the nozzle is worn past its service life. Perform test using a 7/16" bit for the #7 nozzle, a 1/2" bit for the #8 nozzle, and a 5/8" bit for the #10 nozzle.
Has the maximum blast pressure gone down?
A worn nozzle will cause the blast pressure to drop (due to reduced back pressure.) Perform a wear test using a 7/16" bit for the #7 nozzle, a 1/2" bit for the #8 nozzle, and a 5/8" bit for the #10 nozzle. Use a flashlight shining from the opposite end to determine wear.
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