Are such tags available for purchase?
By “OTCG,” I presume you mean oil pipes (I looked up the acronym and found that it stands for “oil country tubular goods,” a term I had not heard before). There are a variety of tags available for use on oil pipes.
InfoChip makes a high-frequency (HF) tag that can be inserted into a small, shallow hole drilled into pipe.
William Frick & Co. offers passive ultrahigh-frequency (UHF) tags in rubber rings that can be fitted around drill pipes, as well as other form factors that might work.
—Mark Roberti, Founder and Editor, RFID Journal
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