Certified Pipefitter Journeyman Exam

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On a Piping and Instrumentation Diagram (P&ID), a line is shown with the label '6"-CS150-AR-042-H'. What does the 'H' at the end of the tag most likely indicate?

The pipe is horizontally oriented. The fluid inside is hazardous. The pipe requires hot insulation. It is a high-pressure line.

Correct Answer:

The pipe requires hot insulation.

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