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Hot Air & Slippery Stuff – 108

Proper Oil Sampling

OIL SAMPLING – Where and how to take an oil sample.

It is very important that oil samples taken for oil analysis are representative of the oil flowing through the system or machine. In order to achieve an accurate sample, please follow these procedures:

> Only use laboratory approved sample bottles.

> Take the oil sample while the system is running or has just been stopped.

> Take the sample from the point where the oil is moving or flowing, ensuring that it is cycling or mixing in the reservoir.


> Flush the valve by turning on and off.
> Turn it on again and allow one or two pints of fluid to flow out.
At this point need I tell you that it is good practice to let the fluid run into a bucket?.
> Allow the oil to continue to flow out, and WITHOUT touching the valve, remove the cap on the sample bottle and place it under the fluid stream and fill it to the mark on the bottle.
> Remove the bottle from the oil stream and immediately replace the cap on the bottle. Then, and only then, turn the valve off. Touching the valve while filling the bottle will most certainly contaminate the sample.


> Use only new and clean tubing for each sample.
> Assemble the hand pump, bottle and tubing ahead of time.
> The oil should be circulating in the tank or the machine has been just turned off.
> Insert tube into a reservoir or storage tank through a port at the top.
> Keep the suction end of the tube away from the inside walls of the tank and approximately halfway between the tank bottom in the oil suface level.
> Allowing the suction end of the to touch the take sides or bottom will most certainly effect the sample results.


Fill out the oil sample data form included with the oil sample bottle and transmit it to the company doing your oil sample test.Your test results sheet should not only have a particle count – but also a summary of what is in your sample. Utilizing the summary sheet, will allow you to do predictive maintenance.