# Dome Pipeline Corporation — Pipeline Safety Interpretation

- **operation:** document
- **citation:** PI-80-002
- **title:** Dome Pipeline Corporation — Pipeline Safety Interpretation
- **source type:** guidance
- **agency:** Pipeline and Hazardous Materials Safety Administration
- **status:** guidance
- **official:** true
- **published on:** 1980-01-17
- **effective on:** Not available
- **summary:** PI-80-002 response to Dome Pipeline Corporation concerning 195.426.
- **machine formats:** - **json:** https://regulus.evalyn.ai/document/phmsa-interpretation-pi-80-002.json
- **markdown:** https://regulus.evalyn.ai/document/phmsa-interpretation-pi-80-002.md
- **app url:** https://regulus.evalyn.ai/document/phmsa-interpretation-pi-80-002
- **source url:** https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretation%20Files/Pipeline/1980/PI80002.pdf
**body:**

<<<PAGE 1>>>

January 17, 1980
Mr. E. Hobson
Dome Pipeline Corporation
District Office
P.O. Box 1430
Plaza Centre One
Iowa City, Iowa 52240
Dear Mr. Hobson:
This is in reply to your letter dated June 14, 1979. We regret the
delay in responding to your letter which we inadvertently mislaid
for a period of time. You requested a finding concerning section
195.416(c); specifically, whether equipping rectifiers with
transmitters to indicate current flow above a certain level and
detecting this operation by a receiver in a patrol aircraft
constitutes compliance with this subsection. Please be advised
that the intent of section 195.416(c) is to ensure that the
rectifiers are functioning and that your proposal meets this
intent.
We commend you on your resourcefulness in developing methods to
monitor cathodic protections.
Sincerely,
/signed/
Cesar De Leon
Associate Director for
Pipeline Safety Regulation
Materials Transportation Bureau
DB
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<<<PAGE 2>>>

June 14, 1979
Office of Pipeline Safety
911 Walnut Street
Room 1802
Kansas City, MO 64106
Gentlemen:
This letter is in reference to DOT Regulations for the
Transportation on Liquids by Pipeline - Part 195, Section 195,
Section 195.416(c) concerning inspection of cathodic protection
rectifiers.
We are currently studying the feasibility of monitoring the status
of our mainline rectifiers by installing a receiver in our weekly
patrol plane in conjunction with a transmitter in each rectifier.
The transmitter would be preset to turn off if the current output
to the groundbed fell below a predetermined acceptable value. The
receiver would emit an audible tone if the transmitter were
operating. Should a rectifier transmitter be off, its number would
be logged on the line flyer report and a man would be dispatched to
investigate the problem.
We would like to know whether this type of surveillance could be
used to satisfy the two month inspection criteria outlined in
Section 195.416(c). This type of inspection would greatly reduce
the manhours spent in rectifier monitoring.
Your prompt response to this inquiry would be appreciated since we
would like to implement this program as soon as possible.
Your very truly,
E. Hobson
Electrical Engineer
DB
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