NADCAP AC7108 - Tank Ambient Room Temperature Requirements

[robanbieber]

I have several solution and rinse tanks in one room for our chemical conversion process. If my documentation states that my solution and rinse tanks are at "ambient temperature" do I need to measure each tanks temperature, or can I measure just one tank and that would apply to all others in the same room... or would just measuring the ambient air temperature suffice... and the room is temperature controlled 24 hours a day 7 days a week...

 

[Ron Rompen]

Measuring the ambient air temperature (or better still, a data logger of the room air temperature) would seem to me to be the optimum solution. Unless the tanks are exactly the same size, with exactly the same contents (including being topped up with exactly the same amount of liquid, etc etc) then there WILL be differences from tank to tank. Monitoring and controlling the environmental conditions that the tanks are maintained in would (IMHO) be the most appropriate action.

 

[robanbieber]

The tanks are all the same size and shape and contain the exact same amount of fluid of 45 gallons each.. some of them are obviously different chemicals but half of the tanks are rinse tanks , so I would think there would not be much difference with the tank temperatures due to different fluids especially when we are targeting ambient temperature range of 60-80 degrees. The tanks are topped off with water that is pulled from a two tank deionizer system that holds ten gallons that is also situated in the same room so any fluid that is added to replace evaporated fluid is already at or close to the room temperature already. Now there is a cleaning tank that is controlled heated to a temp of 130 in the room so there is a heated tank which could affect some of the other closer tanks... So my question is what would the auditor expect or allow in this situation?