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General principles2. Application: considerations applicable to most types of structure3. Application to buried structures4. Reinforcing steel in concrete5.
Application to ships6. Immersed structures excluding off-shore applications 7. The internal protection of plant8. Measures to safeguard neighbouring structures9. Electrical measurements Commissioning, operation and maintenance It represents a revision of CP, which is withdrawn. Cathodic protection is a means of preventing the corrosion of most metals wherever they are in contact with a mass of water or moist materials.
It should not, however, be inferred that cathodic protection, wherever applicable, is necessarily advantageous. Unless the need for cathodic protection is already established, every case should be carefully examined and an evaluation made of the economic advantage of cathodic protection, compared with other methods of avoiding or reducing corrosion, such as sheathing or coating, the use of other materials of construction etc.
Included in the assessment should be the cost and consequences of allowing the expected corrosion to proceed. This may be possible, for example, in the case of steel pilings, while entirely ruled out in the case of high pressure pipelines.
This Part of BS covers good up-to-date practice and contains both guidance on general principles and detailed information on the cathodic protection of particular types of structure or plant, excluding those involved in off-shore applications.
Even where sufficient evidence based on actual installations has not been obtained to enable detailed information to be given, it should not be assumed that cathodic protection is unsuitable if there is sufficient economic incentive.
Lack of evidence has also prevented firm guidance being given at several points in this Part of BS, notably on the test methods needed to avoid excessive error due to potential drop through the electrolyte when the effectiveness of cathodic protection is being assessed by measuring the potential of the metal relative to a reference electrode.
Attention is drawn to the importance of considering any measures necessary to prevent corrosion during the early stages of the design of structures and possible future extensions. Design to prevent corrosion, for example by selection of materials, avoidance of unsuitable shapes or combinations of metals, or by using metal spraying or protective coatings is important, but is outside the scope of this standard.
The corrosion protection of iron and steel in this context is covered by BS
BS 7361-1:1991 Cathodic protection. Code of practice for land and marine applications (Withdrawn)
Negis This is principally due to increased turbulence near the propeller s and the formation of a cell The designer will need to assess the disadvantage of between a bronze propeller and the steel hull. This can usually be carried out on 4. In any event, as a general guide, it should be an electrolyte having a suitable resistivity should not exceed the level necessary to produce and not aggressive with respect to the anode an instantaneous-off potential more negative material. Sleeve arrangements other than the above make the application of cathodic protection to the carrier pipe uncertain; their use should be avoided where possible in favour of the installation of thick wall pipe as required locally.
BS 7361-1 PDF