Conoco-CS 880304EXPLORER PIPELINE comp;:ln,i,,
March 4, 1988
Mr. Steven M. Morton
Chief of Land Development
City of Coppell
P. O. Box 478
Coppell, Texas 75019
RE: CATHODIC PROTECTION TESTING FACILITIES, LETTER OF
MARCH 1, 1988
Dear Mr. Morton:
As stated in my letter to you March 1, 1988, "The cathodic
protection applied to Explorer's 12-inch pipeline should not cause
corrosion interference to existing City of coppell buried fuel
tank, nor should the tank cause the Explorer 12-inch pipeline any
problem".
To confirm that there is no problem, testing facilities are
required. These are referred to as cathodic protection or corro-
sion control testing facilities. They are physical attachments,
normally wires, to each structure, extending above grade to an
easy accessible permanent location.
The installation of testing facilities does not suggest there
will be a problem. Testing facilities on both structures will
allow for the required tests to be taken to confirm the status of
each structure. Confirming there definitely will not be a problem
cannot be done until construction is complete.
Immediately following construction, Explorer will conduct the
required tests to confirm the status of each structure. Explorer
will repeat these tests on an annual basis and at any other time
as may be necessary, should changes be made to either structure.
Mr. Steven M. Morton -2- March 4, 1988
Should you have additional questions or concerns, please do
not hesitate to call.
Yours truly,
S~uel--~L. irwin~-~~
Chief Corrosion Engineer
SLI/tf
copy to: J. B. Benear
C. A. Hilgendorf
File 25.212.0
March 4,
1988
COPPELL PUBLIC WORKS
I~E~ORAI~IIM
TO:
FROM:
RE:
Steve Goram, Director of Public Works
Steven Morton, Public Works Inspector
Explorer Pipeline
Steve, here is the information I requested on the corrosion
control (cathadic protection). Also you will find the
construction area location map. I -have forwarded a copy
to Richard Diano.
SMM/sm
c'XPLORe'R PIPL:LInE comPlqn¥
March 1, 1988
Mr. Steven M. Morton
Chief of Land Development
City of Coppell
P. O. Box 478
Coppell, Texas 75019
RE: CORROSION CONTROL DATA, 12-INCH EXPLORER PIPELINE
Dear Mr. Morton:
Explorer's 12-inch pipeline in the area of the re-route of the
pipeline for the U. S. Post Office and Royal Lane has cathodic
protection applied from an impressed current cathodic protection
rectifier. The rectifier is located approximately 5.3 pipeline
miles east of the re-route location.
The specified rectifier is located at Explorer's Carrollton,
Texas junction and is applying 2.1 amps of cathodic protection
current to the 12-inch pipeline within which the re-route is
located. For cathodic protection application and isolation, this
specific 12-inch pipeline is 11.6 miles in length (5.3 pipeline
miles east; 6.3 pipeline miles west of the re-route). The cath-
odic protection potential at the re-route area is maintained at an
approximate cathodic protection pipe-to-soil potential of -1.30
volts. There is 0.32 amps of cathodic protection current passing
this location from the 6.3 miles of 12-inch pipeline to the west,
returning to the source of cathodic protection, the impressed cur-
rent rectifier at Explorer's Carrollton, Texas Junction.
Cathodic protection being applied to Explorer's pipelines meets
or exceeds the requirements of the Federal Department of Transpor-
tation, Office of Pipeline Safety Part 195.
The cathodic pro~ection applied to Explorer's 12-inch pipeline
should not cause corrosion interference to existing City of
coppell buried fuel tank, nor should the tank cause the Explorer
12-inch pipeline any problems. Explorer has or will install suf-
ficient cathodic protection testing facilities to confirm the sta-
tus of its pipeline. The city of Coppell needs testing facilities
installed on their fuel tank for corrosion control testing.
Mr. Steven M. Morton -2- March 1, 1988
Testing facilities on both structures will allow monitoring and
testing following completion of construction; on an annual basis
during routine testing by Explorer; and at any other time as may
be necessary, should changes be made to either structure.
Should you have additional questions or concerns, please do
not hesitate to call.
Yours truly,
Samuel L. Irwin
Chief Corrosion Engineer
SLI/tf
copy to: J. B. Benear
C. A. Hilgendorf
File 25.212.0
'"XPLORe"R PlPe'l. comennY
March 1, 1988
Mr. Steven M. Morton
Chief of Land Development
City of Coppell
P. O. Box 478
Coppell, TX 75019
RE:
Coppell Maintenance Facility - Area Affected by
Construction
Dear Mr. Morton;
Per your request in your letter dated February 18,
1988, the attached drawing shows the area inside the
City's Maintenance facility that will be affected by
construction. This drawing shows a 75 foot work area
along the pipeline route that will be used for
fabrication of the pipe and for backfill placement.
Explorer will require use of this 75 foot work
area for approximately four days during construction.
I will notify you 48 hours in advance when construction
in that area is to begin.
Construction is scheduled to begin on March 7,
1988. Construction will begin at the Minyard spur
tracks and will continue westward until completion.
will be on-site for the duration of this project.
If you have any further questions, please call me
at (918) 493-5153.
Sincerely,
o
Project Engineer
CAH/lk &~
cc: J. B. Benear
File 25.212.0