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topic 11924

Salt Spray Fog Collection

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The collection of salt spray fog in our chamber is consistently at the minimum. We have tried different air pressure settings, cleaned all orifices, adjusted the tower positions, and all other variables. Nothing seems to help to increase the pick-up collection. Any suggestions would be appreciated.

Steve Peters
All Metals Processing - Stanton, California, USA


Replace the muslin cloth on the end of the aspirator pick up tube. Adjust the float valve for the liquid level to a little higher level. I had a similar problem once and found that I had a tiny flap of plastic in the aspirator that acted like a flapper or reverse flow valve. You could not see it in the "retracted position" but it really shut off the flow when it was under pressure. Found it by blind dumb luck.

James Watts
- Navarre, Florida


Steve -

If the collection rates are even, but low, James is probably correct in his reply that the flow of solution is obstructed. Depending upon the manufacturer of the chamber, there should be a salt solution filter between the solution reservoir and nozzle. It may need replaced or simply cleaned. Check all the fittings to be certain you are not losing air pressure or solution flow. If you raise the bubble tower air pressure, make sure you raise the temperature too. (Refer to ASTM B117 [link by ed. to spec at TechStreet] for the actual operating conditions.)

Good luck.

Cynthia L. Meade
- Sylvania, Ohio, USA

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