Coolant Tank Concentration Audit
Track coolant concentration, top-up quality, biocide treatment, and skimming in one repeatable audit. Keep machines within spec, reduce contamination risk, and document corrective actions fast.
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What's inside this template
Audit Details
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Machine or coolant system identified
Enter the machine name, asset ID, or coolant system identifier.
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Audit date and time recorded
Document when the coolant concentration audit was performed.
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Coolant type confirmed
Select the coolant type in use for this system.
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Reference procedure available
Confirm the applicable SOP or maintenance procedure is available to the inspector.
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Inspector signature completed
Inspector must sign to confirm the audit was completed accurately.
Refractometer Reading
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Refractometer calibrated and clean
Confirm the refractometer is clean, functional, and calibrated before use.
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Sample taken from representative location
Confirm the sample was taken from a well-mixed, representative point in the tank.
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Measured coolant concentration
Record the measured concentration from the refractometer reading.
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Concentration within target range
Confirm the measured concentration is within the approved operating range.
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Reading recorded in logbook or CMMS
Verify the refractometer result has been documented in the maintenance record.
Top-up and Makeup Condition
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Coolant level adequate
Confirm the tank level is sufficient for normal operation.
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Top-up fluid mixed to correct ratio
Confirm any top-up or makeup coolant was prepared at the correct concentration before addition.
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Signs of excessive dilution or overconcentration
Check for evidence of water imbalance, poor mixing, or concentration drift.
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Top-up volume recorded
Enter the amount of coolant or water added during this audit, if applicable.
Biocide Treatment
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Biocide treatment required by schedule
Confirm whether the coolant system is due for biocide treatment according to the maintenance schedule.
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Biocide added as scheduled
Verify the required biocide treatment was applied when due.
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Biocide product and dosage documented
Record the product name, dosage, and application details.
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Evidence of microbial growth or odor
Check for visible contamination, slime, foul odor, or other indicators of microbial activity.
Skimming and Cleanliness
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Skimmer operating effectively
Confirm the skimming system is functioning and removing tramp oil as intended.
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Surface free of excessive tramp oil
Check the coolant surface for visible oil buildup or contamination.
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Tank and surrounding area clean
Verify the tank, covers, and surrounding work area are clean and free of spills.
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Corrective action notes
Document any cleaning, skimming, treatment, or adjustment actions taken during the audit.
Common use cases
Frequently asked questions
Who should use this coolant tank concentration audit template?
It is designed for maintenance, production, and quality teams that manage machine coolant systems. Use it when you need a consistent way to verify concentration, cleanliness, and treatment status.
What does this template help prevent?
It helps catch dilution, overconcentration, microbial growth, and tramp oil buildup before they affect machining performance. Regular audits also make it easier to spot trends and schedule corrective action.
Can this template be used with a CMMS or logbook?
Yes. The template includes fields for recording readings, dosages, and corrective notes so results can be entered into a CMMS or paper logbook. That makes it easier to track history across shifts and machines.
Do I need a refractometer to use this audit?
A refractometer is part of the workflow because it provides the concentration reading needed for the audit. The template also supports the surrounding checks, such as sample location, calibration, and target range verification.
Is this template suitable for multiple coolant systems?
Yes. Each audit starts with the machine or coolant system identification, so the same format can be reused across different tanks. That makes it practical for shops with several machines or lines.
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