What is the cause of a white ring on the BART test inner tube?

Document ID

Document ID TE7724

Version

Version 3.0

Status

Status Published

Published Date

Published Date 07/24/2018
Question
What is the cause of a white ring on the BART test inner tube?
Summary
BART test inner tube
Answer
The inner tube in a BART tester may have a white ring near where the ball sits in the tube before sample is added.  This white ring will not affect the test. It is a product of the ball rotating around in the inner tube.

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