STANDARD. ISO. First edition. Petroleum and natural gas industries —. Cathodic protection of pipeline transportation systems —. Part 1. Purchase your copy of BS EN ISO as a PDF download or hard copy directly from the official BSI Shop. All BSI British Standards. STANDARD. ܚ. ISO. First edition. an Petroleum and natural gas industries -. Cathodic protection of pipeline transportation systems
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Annex B shall apply with respect to the detection and control of interference currents.
For 115589-1 welding on live pipelines, a safety procedure shall first be developed, addressing the following: Such measures should take into account the need for potential equalization between the pipeline, anodes, power supplies, reference electrodes, etc.
In this case Equations D. As the voice of the U. For concrete casings, the CP current can pass through the concrete if it is sufficiently conductive and if there is no metallic 1589-1 between the reinforcement and the pipeline.
If the use of monobloc isolating joints is not practical, electrical isolation should be provided using isolating flange kits.
This method should be applied if the required reduction of induced voltage 51589-1 be achieved by simple earthing. Devices other than the spark-gap type may be used if reliable and properly documented.
Monobloc isolating joints should be used wherever possible.
Distribution boxes and monitoring stations used for bonding of current-carrying cables should be located outside hazardous areas or, if this is not possible, shall be approved for the relevant electrical area classification.
Automatic current control alone shall not be used for setting current flow where soil moisture or other variations near the pipeline can cause potential variations. Because a large amount of data is produced, 155891 field computer or data logger is normally used and the information later downloaded to produce plots of pipeline potential versus distance from the fixed reference point.
The specific composition of the anode backfill shall be determined by the need to minimize resistivity and maximize moisture retention. If pipelines are running in parallel, but not in the same trench, each pipeline shall be provided with separate potential-monitoring facilities.
ISO – Standards Australia
The criterion for CP is therefore E u Ep The protection potential of a metal depends on the corrosive environment electrolyte and on the type of metal used. EN Valves for natural gas transportation in pipelines – Performance requirements and tests. Any such effects shall be investigated and their likely impact upon the integrity of the pipeline and the safety of personnel shall be determined see Annex B.
If the potential on the other side of the isolating device does not change, or changes in value in the opposite direction due to an interference effectthe isolating device may be considered to be effective. Further guidance on methods for mitigating d. If the pipeline is transporting any fluids that are electrically conductive, the isolating joints shall be internally coated on the cathodic most expected negative potential side, for a length sufficient to avoid interference-current corrosion.
Such conditions can include shielding e.
BS EN ISO 15589-1:2017
Reference electrodes shall be regularly calibrated. Alternatively, the space between the casing and the pipeline should be filled with a material with adequate long-term corrosion protection properties.
For undated references, the latest edition of the referenced document including any amendments applies. The pipeline inside the casing shall have a high-quality coating for protection against corrosion. Please first log in with a verified email before subscribing to alerts.
Routine functional checks, e. Any significant change in the current attenuation rate could indicate a coating defect or contact with another pipeline. There are complementary techniques which can be used to give a more accurate assessment of the effectiveness of the CP. Information obtained during previous site surveys relevant to the proposed pipeline route may be used provided that the date and source of such surveys are documented. Drainage stations Measure drain-point potential and the current at least monthly Connections to foreign pipelines Measure current flow at least annually Bonding devices and grounding systems Measure electrical continuity at least annually Safety and protection devices Measure settings and function at least annually At monitoring stations Measure instant-off potentials annually a Less frequent measurements may be considered based on results of specialized surveys see Other alloys may be used provided the performance in similar soils is reliable and documented.
This section of the The work of preparing International Standards is normally carried out through ISO technical committees.