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Interpretation Response #PI-74-021 ([Middle Tennessee Natural Gas] [Stephen C. Stinson])

Below is the interpretation response detail and a list of regulations sections applicable to this response.

Interpretation Response Details

Response Publish Date:

Company Name: Middle Tennessee Natural Gas

Individual Name: Stephen C. Stinson

Location State: TN Country: US

View the Interpretation Document

Response text:

Mr. Stephen C. Stinson
Middle Tennessee Natural Gas
Utility District
P. O. Box 231
Smithville, TN 37166

Dear Mr. Stinson:

Than you for your letter to Mr. Frank Fulton of February 12, 1974. In response to the questions
you ask, we offer the following:

Question: In section 192.63 you say each piece of pipe must be marked. What happens when this is covered by coating?

Answer: The intent of the regulation is that the product, pipe, fitting, etc., be clearly identified from point of manufacture to installation. Where pipe is coated before installation, covering the marking, the coated pipe must be remarked unless some other means of identification permitted
by section 192.63 is used.

Question: If the specifications of the pipe are listed on the bill of lading and the original purchase
order, is a blanket identification sufficient?

Answer: A blanket identification where permitted under section 192.63 is sufficient only if the
items involved are clearly identified from point of manufacture to installation, as when all items so
identified are used at a single installation. Where individual items covered by a blanket
identification are used separately, each item must be marked exclusive of the blanket

Question: How have people maintained marking that was put on the coating? As you know,
ultra violet light attacks PVC and ink on it. Do you require identification to be maintained on
coal tar? If so, how do you identify field coated pipe?

Answer: For coated pipe in short term storage or protected storage , a marking on the coating or
coating wrapper will normally remain legible until installation. For coated pipe in long term
storage, marking is usually maintained by painting the pipe inside each end. Also, some operators
paint a color code on pipe. It is an operator's responsibility to use markings that will identify
material until it is installed. Section 192.63 does not require that markings be maintained after
installation, but materials used in any segment of pipeline must be identifiable for the life of the facility to ensure proper operation and maintenance. This is accomplished by maintaining
appropriate records.

We hope that his sufficiently answers your questions. If we may assist further, please let us know.



Joseph C. Caldwell
Office of Pipeline Safety

Regulation Sections

Section Subject
192.603 General provisions
192.63 Marking of materials