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Why Flush Old Lubricating Oil Quiz

Posted on April 20, 2026 by

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Question 1 of 5
1. Question
What is the primary goal of a lubrication system flush?
Reduce reservoir size to lower residence time
Remove contaminants and degradation products to restore cleanliness
Change the pump speed at startup
Increase the oil viscosity for better sealing
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Question 2 of 5
2. Question
A typical target line velocity for effective turbulent flushing in main headers is:
1.0 to 1.5 meters per second
0.2 to 0.5 meters per second
5 to 7 meters per second
2 to 3 meters per second
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Question 3 of 5
3. Question
Which standard provides a method for coding particle contamination levels in oil?
ASTM D4057
API 614
AGMA 9005
ISO 4406
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Question 4 of 5
4. Question
Which statement best describes staged filtration during a flush?
Start with fine filters to capture the smallest particles first
Use coarse, then medium, then fine filters as differential pressure stabilizes
Use only magnetic filtration for all debris types
Increase filter micron size as the flush progresses
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Question 5 of 5
5. Question
The best practice for sampling during a flush is to:
Sample from a live turbulent line using clean bottles and proper port flushing
Sample from a stagnant low point drain
Sample from the reservoir surface with an open container
Wait until the end of the flush to take any samples
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