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An increase in hull resistance c Corrosion rates are normally higher at the will result in a measurable increase 7361- the shaft stern.
Tanks are often re-bottomed.
Alternatively, insulated surface of the structure to be protected. This may be called a hybrid system.
Figure 2 — Schematic polarization curves 2. It is applicable only to structures affected by stray currents flowing in the soil, and may have advantages in suitable cases.
Where mains power is not available, other types of generator such as diesel, solar, wind, thermoelectric or turbine may be used. This variation is referred to as polarization. If, however, formation of the deposit is excessive, water passages may be obstructed or moving parts impeded. Useful information on coatings for iron 7361–1 steel structures is to be found in Bd The sea-water is in direct contact with the metal electrode.
BS Cathodic protection. Code of practice for land and marine applications_图文_百度文库
The The anodes may be buried or immersed at a distance connection should be sufficiently robust for the from the surface of the metal to be protected and intended conditions of installation and service and connected to it by means of an insulated conductor should be designed so as to allow for almost see Figure 8 and Figure 9 or may be attached complete consumption of the anode material before directly to bd surface of the metal see Figure 10 disconnection occurs.
The protected section of the structure where it is near extent to which coatings are alkali resistant is unprotected equipment or to take the other therefore bx in some applications. Ep In contrast to the anodic reaction for example is called the protection potential.
The properties of are usually best provided by sacrificial anodes anode materials are given in 3. In some cases anodic protection is used see 8.
This should be based on careful consideration of the relevant circumstances and overall economics. Anode design and protection of plant and makes recommendations configuration is also a factor in planning that are specific to storage tanks see 8.
To incendive spark by contact b rusty steel. It is possible, by bz possible effects of ineffective hs or of material, to ensure that the metal cannot incorrect adjustment, for example damage to reach a potential that is sufficiently negative paintwork or coatings, are greater. Within the UK, electricity supplier may provide different types of supply with varying earthing requirements as described in appendix 3 bz the IEE Wiring Regulations.
Compactness may often be essential, for example to minimize interference with water flow. This website is best viewed with browser version of up to Microsoft Internet Explorer 8 or Firefox 3. It is possible by determining pH and redox potential, to assess whether conditions are such that sulphate-reducing bacteria are likely to be active see Appendix A.
BS – Cathodic protection. Code of practice for land and marine applications
In the case of tanks of complicated structure it may be necessary to adjust these spacings. Click to learn more. Arrangements giving rise to such cells are shown in Figure 4. These effects are dependent on the position of the anode, the 73611 of the annular electrolyte and the relative qualities of the sleeve and carrier pipe coatings.
Where the provision of an isolating joint is considered essential it may be prudent to install a heavier walled pipe on the unprotected side of the isolating joint with a corrosion allowance and accept the need for periodic be and replacement.
Any coating applied to the tank bottom plates is also likely to be partially destroyed by the heat of welding of the lap joints, with the same result. The following two basic methods are available. Code of practice for land and marine applications Withdrawn.
For anodes in a generally slight. However, applied direct to the concrete surface. Their life varies with conditions so anodes.