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Dust Collectors for Thermal/Flame Spray

Sizing Recommendations

With Thermal Spray applications, proper information gathering of the specific application is crucial since there are many different types of processes and material coatings, most all of which will react differently inside the dust collector. Although there are different powders used in plasma spray for example, the process results in generally spherical shaped particulate and consistent in size at around three microns making it fairly easy to capture.

Over the years, we tried several types of dust collection equipment on EAW spraying. However, all previous attempts at extended filter life (more than six months) failed until we installed a high efficiency "Gold Series®" cartridge collection system manufactured by Farr, Arkansas. At the time of this writing, the Gold Series collector is still performing exceptionally well without a filter change after about a year and a half.
-David Drozd, Pamarco

With the Camfil Farr APC Gold Series vertical cartridge collector, plasma spray and powder applications are generally sized at a conservative air-to-cloth (A/C) ratio with HemiPleat® fire retardant cartridges. Electric Arc Wire (EAW) Spray on the other hand has proven to be a real challenge. This dust is very fine (mostly sub-micron) and is inconsistent in shape. This seems to be true of the process itself no matter what type of wire is being used.

Two GS40 models on a thermal spray application

Two GS40 models on a thermal spray application.

It is also important to note that certain hazardous powders and metals (such as nickle and chromium) will require safety after-filters when discharging to atmosphere. Please work with Camfil Farr APC application engineers to insure the correct information is understood and proper sizing is accomplished.

GS32 on a Thermal Spray application

GS32 on a HVOF and plasma spraying