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Machine Coolant Filtration Case Study Bacteria Growth

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Machine Coolant Filtration Case Study Bacteria Growth

# 3 Weak Machine Coolant and Extreme Bacteria Growth

There are many reasons to filter machine coolant other than to filter out particles that can potentially damage tools and equipment.  Filtering Machine Coolant also prevents bacteria from growing, creating a safer work environment.  Refer back to the Coolant Index for more information on Filtering Coolant and Machine Coolant Properties.

The machine coolant used is much too weak.  It is being used at the level of make –up coolant.  Machine coolant is ordinarily mixed in the range of 20:1 to 30:1.  Water evaporates faster than machine coolant so the make-up machine coolant is largely water and is usually mixed about 10% of the level of new machine coolant.   You need to add additional machine coolant since the rust prevention, lubrication and bacteria control properties in machine coolant get used up. 

 3_bacteria-11.jpg

 3_bacteria-21.jpg

 

Bacteria  Standards

Bacteria Tests

The bacteria and fungus levels are very high because the coolant concentration is much too low.  The cobalt levels are too high in some units and you need to use cobalt remover and filter system to reduce the cobalt levels. 

Standards
Coolube 220 
pH above 8
Refractometer  2.4 – 3.6
Bacteria – suggested action level   100,000 or higher
Fungus   suggested action level   1,000 or higher
Tramp oil
Particulate
Cobalt – suggested action level Boeing standard is 10   

 

Test Results
Cobalt - Grinders 2, 3 & 4 tested high for cobalt
All four grinders tested high for Bacteria
All four grinders were much too low for concentration (Refractometer)
All four grinders were very good for tramp oil and particulate matter. 

Use of Triadene

Triadene can be used safely but it needs to be used carefully.  Proper coolant concentration should eliminate or greatly reduce the need for Triadene 

Sampling Results - Done October 22, 2005

The major problem is that the coolant was much to weak.  The Refractometer readings should have been about 5.0 instead of just a fraction of that.   Instead of suing coolant concentrate and diluting it they were using makeup coolant that had already been diluted 10:1. 

# 1 Vollmer CHC 020

 

Standards

pH 

8

above 8

Refractometer ( 4 tests)

0.2, 0.1, 0.2, 0.2

2.4 – 3.6

Bacteria

10 million CFU / gram

SAL 100,000 or higher

Fungus

100,000 CFU / gram

SAL 1,000 or higher

Tramp oil %

None

 

Particulate %

None

 

Cobalt Concentration

0 mg / L

10 mg / L

 

 

 

# 2 Wright W-150 HD

 

 

pH

8

above 8

Refractometer (4 tests)

0.9, 0.9, 0.9, 0.9

2.4 – 3.6

Bacteria

10 million CFU / gram

SAL 100,000 or higher

Fungus

100,000 CFU / gram

SAL 1,000 or higher

Tramp oil %

None  

 

Particulate %

None

 

Cobalt Concentration

35 mg / L

10 mg / L

 

 

 

# 3 Wright W-150 HD

 

 

pH

7

above 8

Refractometer (4 tests)

0.5, 0.2, 0.5, 0.5

2.4 – 3.6

Bacteria 

10 million CFU / gram

SAL 100,000 or higher

Fungus

1,000 CFU / gram

SAL 1,000 or higher

Tramp oil %

None

 

Particulate %

None

 

Cobalt Concentration

150 mg / L

10 mg / L

 

 

 

# 4 Front right

 

 

pH 

9

above 8

Refractometer (3 tests)

0.5, 0.5, 0.5

2.4 – 3.6

Bacteria

100 million CFU / gram

SAL 100,000 or higher

Fungus

100,000 CFU / gram

SAL 1,000 or higher

Tramp oil %

None

 

Particulate % 

None

 

Cobalt Concentration

50 mg / L

10 mg / L

 

 

 

 

CFU is Colony Forming Units

SAL is Suggested Action Level

 


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