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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The detailed design shall include a procedure for drilling the deep-well, establishing the resistivity of the soil at various depths, completing the borehole and method of installing the anodes and conductive backfill.
This part of ISO is applicable to buried carbon steel and stainless steel pipelines on land. NOTE 2 Possible effects associated with a. Proceed to Checkout Continue Shopping.
In case of low soil resistivity, high a. This can be a dedicated layer in addition to a corrosion-protection layer or it can be a layer such as polyurethane or rubber which provides both corrosion protection and thermal insulation.
Such conditions can include shielding e. Reference electrodes should be periodically calibrated by checking them against laboratory-type reference is.
ISO – Standards Australia
Cables shall be sized such that no excessive voltage drops occur which reduce the capacity of the system. The basic design shall include a calculation of the groundbed resistance based upon the most accurate soil resistivity data available. Where an alternative is offered, any variations from this part of ISO should be identified.
Current density requirements also depend upon the oxygen content and resistivity of the soil. Below-ground electrical connections shall be encapsulated or coated using a material which is compatible with the pipeline coating.
The continuity of non-welded pipelines shall be checked by carrying out resistance and potential measurements, see Annex A.
When corrosion potential measurements are carried out, all temporary CP systems shall be disconnected and the pipeline shall be fully depolarized see Figure A. Already Subscribed to this document. A typical composition of magnesium anodes is given in Table 3. Reference electrodes shall be constructed in such a manner that their potential is not affected during voltage measurement.
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BS EN ISO 15589-1:2017
EN Valves for natural gas transportation in pipelines – Performance requirements and tests. The probes are normally held parallel to and directly above the pipeline, enabling the direction of current flow to the defect to be determined. If this is impossible, then the likely consequences with regard to safety shall izo assessed. Coupon instant-off potentials are more accurate if measured against a permanent reference electrode buried alongside the coupon or permanently built in as a facility polarization probe.
The details of the pipeline isolation e. Standards Subsctiption may be the perfect solution. NOTE Metallic casings only provide temporary borehole stabilization, as the metal will be consumed by the d. Please first verify your email before subscribing to alerts.
The coating breakdown factor, Fc, includes the effects of factory coating and a compatible field-joint coating. 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 ixo 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 The calculation shall be carried out for the unused anode bed.
This part of ISO is not intended to inhibit alternative equipment or engineering solutions to be used for the individual application.
Other alloys may be used provided the performance in similar soils is reliable and documented. This equipment also requires routine calibration and periodic safety checks.
After installation of the cable-to-pipe connection, the coating shall be repaired using a suitable coating material. This part of ISO specifies requirements and recommendations for investigations prior to installation and construction, materials, equipment, installation, commissioning, operation, inspection and maintenance of cathode protection systems for Piping systems on land, as defined in ISO or EN for 15598-1 oil and gas industry, and in EN isl EN for the gas supply industry in Europe.
Remedial actions shall be taken if periodic tests and inspections indicate that protection is no longer adequate.