Published on Petroleum Equipment Institute (https://testing.pei.org)

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Thread Protector [1]

A temporary plug fitted into a tank [2] opening at the time of shipment to protect the internal threads in the opening from damage during shipment and storage. The thread protector is removed prior to final testing and operation. 

Thread protectors are also installed on the ends of steel pipe for the same purpose.

Source URL (modified on 10/23/2014): https://testing.pei.org/wiki/thread-protector

Links
[1] https://testing.pei.org/wiki/thread-protector
[2] https://testing.pei.org/node/272