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April 25. 1984
G=n=RRL
catmqoc mo^uton M*atT
Tenneco Oil Company P. 0. Box 849 Pasadena* Texas 77501*0849
Attention: Mr. Paul R. Prokish
Reference: Cathodic Protection Survey of Pasadena Plant and Off-Sltc Pipelines - Contract number 90-2945, P. 0. #138653-0lA
Dear Mr. Prokish;
A cathodic protection survey of the above referenced facilities vas completed on March 21, 1984. This survey vas conducted to determine the effectiveness of the cathodic protection system for the plants underground metallic struc tures and off-site pipelines.
Survey Procedures
Plpe-to-soil potentials were measured at random test points throughout the plant. The test point locations can be seen on Texmeco drawings number C-TM1-200-P-112 and C-PC1-P-01-353. These potential measurements were taken using a high impedance voltmeter in conduction with a standard copperc pper sulphate reference electrode. The rectifiers were Inspected and the voltage and amperage output vas measured. Anode current output for each anode in the deep veil groundbeds vas recorded. Plpe-to-soil potentials and magnesium anode current output were taken at test stations for the off-site pipelines. Data pertaining to this survey can be seen on the attached data sheets.
Survey Results
One criteria for effective cathodic protection is a minimum of -0.85 volts DC. This measurement is taken between a standard copper-copper sulphate reference electrode and the pipeline. Potential measurements in the P.A. unit area were below acceptable levels. The current output for rectifiers "A" and "B" were Increased to there maximum output after low potentials were discovered in this area. After the rectifiers' output vas increased, potential measurements were repeated. Plpe-to-soil potentials did increase, but did not Increase above the required -0.85 volts.
R ctlfier "0" has an internal intermittent electrical short. During this survey the rectifier was operating satisfactorily. After the survey vas
TX 77041
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Mr* Paul R. Proklsh April 25, 1984 Pag# two
completed tha rectifier was takan out of aarvlea, rapalrad and raturnad to aarvlca.
Rectifier "A" vaa found to have no currant output at tha baginning of the survey. The problem was Investigated and found to be a loose connection for the positive cable In tha anode junction box. This connection was repaired and the rectifier Is operating correctly.
Rectifier "D" was found to have a damaged anode junction box* The rectifier and anodes are operating satisfactorily, but the box should be repaired or replaced.
Ov r all the plpe-to-soil potential measurements were above the -0.85 volts required for cathodic protection except In the area of the P.A. unit.
Plpe-to-soil potential measurements were taken at random test stations for th off-slte acetylene, hydrogen, AOG and VCM pipelines. All potentials recorded were above the criteria for cathodic protection.
R commendations
It is recommended that a new groundbed and rectifier be Installed In the area of the P.A. unit. The system recoxsnended would be similar to the existing systems. The groundbed would be a 8" x 200' hole with 18 Durlchlor 51 type "M" anodes. Metallurgical coke breeze would be pumped around the anodes. Th anode lead vires vould be terminated in a junction box with current measuring shunts. A Universal 45 volts, 60 amp air cooled rectifier vould be installed on a pole near the groundbed location. The AC power required for the rectifier vould be 480 volts, 3 phase.
It is also recommended that the anode junction box for rectifier "D" be repaired or replaced.
Some test points shown on drawing number C-PC1-P-01-353 are located a few feet from each other. It is recommended that if two test points are located In close proximity, that one be omitted. Test point number 12 is on the dock above the water line and therefore, should be omitted.
We recommend that you continue to check the rectifiers on a monthly basis and have a complete plant survey yearly.
Gen ral Cathodic Protection Services, Inc., vould be pleased to install the recommended groundbed and rectifier for a turnkey price of $12,351.00. The AC power to the rectifier vould be the responsibility of Tenneco. This price Is valid for a period to 90 days.
TEN 1008
Hr. Faul t. Fr klsh April 25. 1984 Fag* thr* Enclo**d la our lnvolca nuaber 01-TX-25037F In th* aaount of $1,492.00 t cov*r tha cose of this survay and rectifier repairs. Ve appreciate this opportunity to have been of service to your coapany. Very truly yours. General Cathodic Protection Services, Inc. TAK/afm
TEN 1009
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PlPE-TOAOO. POTENTIALS
tier. NO.
LOCATION
CU/CU tCj, SCFERENCS
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