Pipeline Test Stations Locations
Pipeline Test Stations Locations
(OP)
Hello,
Finishing a CML&C steel pipeline design for the conveyance of raw water... Looking for a good reference or design manual which explicitly discusses the quantity and location of permanent reference electrodes. Our pipeline is about 5,000 feet in length and varies from 30 to 20 inches in diameter. The best I reference I've found thus far, by the US Bureau of Reclamation (Technical Memorandum No. MERL-2012-40) recommends the following:
1. At the each end of any electrically continuous pipeline.
2. Approximately every 1,000 feet for long electrically continuous segments of pipeline.
3. At one end of all casings.
4. At all foreign pipeline crossings.
5. At all sets of bonded metallic fittings on nonmetallic pipe.
6. At all bonded structures(buried yard metalwork, tanks, ect.)
7. As close to structure as possible.
8. Located to make them readily accessible.
9. Where test stations will not interfere with operations.
Are these recommendations sufficient? Or should I continue the search?
Thank you
Finishing a CML&C steel pipeline design for the conveyance of raw water... Looking for a good reference or design manual which explicitly discusses the quantity and location of permanent reference electrodes. Our pipeline is about 5,000 feet in length and varies from 30 to 20 inches in diameter. The best I reference I've found thus far, by the US Bureau of Reclamation (Technical Memorandum No. MERL-2012-40) recommends the following:
1. At the each end of any electrically continuous pipeline.
2. Approximately every 1,000 feet for long electrically continuous segments of pipeline.
3. At one end of all casings.
4. At all foreign pipeline crossings.
5. At all sets of bonded metallic fittings on nonmetallic pipe.
6. At all bonded structures(buried yard metalwork, tanks, ect.)
7. As close to structure as possible.
8. Located to make them readily accessible.
9. Where test stations will not interfere with operations.
Are these recommendations sufficient? Or should I continue the search?
Thank you
RE: Pipeline Test Stations Locations
RE: Pipeline Test Stations Locations
RE: Pipeline Test Stations Locations
Usually dictated by location and access, i.e. you can't have it in the middle of a field.
Each CP engineer is law unto themselves in my experience so you could go from 100m between them to 1500m depending on who you choose.
But that set of criteria look's Ok to me
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Pipeline Test Stations Locations
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P.E. Metallurgy, consulting work welcomed
RE: Pipeline Test Stations Locations
RE: Pipeline Test Stations Locations
It would be of great interest to know what type Cathodic Protection suystem is being proposed for pipline. Is it going to be a sacrificial system or immpressed current system? A sacrificial system would certainly have more test posts as sacrificial anode do not protect well over long distance, thus requiring anodes at fairly short distances, each anode or anode bank should be terminated in a post that is suitable for taking pipeline potentials. However on a 5000 feet long pipe a single transformer rectifier and ground bed would be norm, situated close to pipeline center with suitable ground bed connection post and drain point test post.
The pre-construction CP survey carried out by a competant CP Senior Technician will give you the most guidance on system requirement, this survey should include soil resistivity and soil pH data. Without a survey being carried out it is quite possible the wrong type of CP system may be installed. It would also highlight and document the requirement of any additional test facilities.
I would however suggest the installation of DC coupons and permanent reference elecrodes at each test facility, this is a requiremnet of the UK's biggest pipeline operator and is documented in their design procedure.
RE: Pipeline Test Stations Locations
RE: Pipeline Test Stations Locations
RE: Pipeline Test Stations Locations
You can add coupons as a few have suggested if you want also. But if your client doesn't current use them/understand them - they are honestly a waste of money (unless they consult out their corrosion monitoring).
RE: Pipeline Test Stations Locations
RE: Pipeline Test Stations Locations
RE: Pipeline Test Stations Locations
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This course intended to provide and refresh the essential electrical knowledge and skills every corrosion personnel, including corrosion Engineers and technicians, CP technicians, and chemical laboratory personnel should have. This training course will be in parts, this course is part number 2
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RE: Pipeline Test Stations Locations
RE: Pipeline Test Stations Locations
With regards to the chemical makeup of the electrolyte low sulphate is good, but the real enemy, not only for reference electrode selection but for protection against corrosion of the pipe is chlorides. The reason for this is the pipe is going to be coated in cement motar, assuming this is a high pH cement it would make the steel passive (consult the porbaix diagram for corrosion of steel versus pH value). Chlorides have 2 major influences on this type of installation. Firstly if cholrides are absorbed into the cement motar, it will change the steel pipe from being passive to being active. This means the pipe will start to corrode and the corrosion procuct has a volume 3 time larger than the steel that has been consumed causing the cement motar to fracture and break up. Additionally cholrides attack Cu/CuSO4 reference electrodes causing them to fail. Therefore, if the pipe route is under a tidal water way or there is standing brackish water in the vicinity of the pipeline chloride is a real threat to this pipeline and the installed Cu/CuSO4 reference electrodes.
With these considerations my advice would be to recommend an impressed current system installed at the midpoint of the pipe section. As this monitoring point would also be a drain point for the Cathodic Protection system and is well within recommended distance from either end of the pipe for future surveys such as Close Interval Potential Surveys. Then you can consider other test points to fill the requirements you listed above.
RE: Pipeline Test Stations Locations
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