Mae anod rhwyll yn anod ategol ar gyfer amddiffyniad cathodig cyfredol a ffurfiwyd trwy groes-weldio anod rhuban metel bonheddig a darn cysylltu metel. Mae'r rhwyd anod wedi'i gladdu yn sylfaen y tanc i ddarparu cerrynt amddiffyn cathodig ar gyfer plât gwaelod y tanc.
Yn gyffredinol, mae pibell fetel yn elfen biblinell hyblyg, sy'n cael ei gwneud o ddur di-staen. Mae'r corff pibell a'r llawes rhwyll yn cael eu gwneud yn gyffredinol o ddur carbon. Mae gan bibell fetel briodweddau ymwrthedd tymheredd uchel, ymwrthedd tymheredd isel a gwrthiant cyrydiad, ac mae ganddo fanteision pwysau ysgafn, hyblygrwydd da a gosodiad cyfleus. Ar yr un pryd, gall y bibell fetel hefyd liniaru dylanwad ehangiad thermol a chrebachiad oer.
The problems in use are: ① serious distortion of metal hose; ② The strength of the bellows is not enough, resulting in "bulge" on the surface of the pipe body; ③ The lateral displacement is too small, and the oil tank is easy to crack when sinking.
Attention should be paid when purchasing: ① select the products of manufacturers with good reputation and excellent product quality; ② If the metal hose works at high temperature, the influence of temperature on pressure should be fully considered. The pressure shall be corrected with reference to the pressure correction coefficient table, and the manufacturer must provide the pressure correction coefficient table; ③ If flange connection is adopted, loose flange shall be adopted at one end to reduce the degree of hose deformation and prolong the service life; ④ Under the same conditions, a longer metal hose shall be selected to increase the lateral displacement and axial displacement.
Attention during installation: ① check the quality of metal cathodic protection hose before installation, and solve problems in time; ② Prevent welding slag splashing on the hose and mechanical wear; ③ The installed metal hose shall not be twisted; ④ The metal hose is not allowed to bear tensile stress, and a certain degree of freedom shall be maintained; ⑤ Before the new tank farm is put into operation, the pipes and metal hoses connected to the tank must be installed after the water test is qualified.
Attention during use: ① the bellows is made of stainless steel, and the pitting corrosion of chloride ion shall be prevented during use; ② Avoid water hammer on the pipeline equipped with metal hose, especially the heavy oil pipeline. When sweeping, slowly open and close the sweeping valve. If necessary, drain the condensate in the steam before sweeping; ③ For the sake of safety, do not artificially cause pressure holding at the metal hose to avoid danger; ④ The distortion and deformation of hose caused by uneven settlement of oil tank shall be handled properly in time; ⑤ Check the metal hose regularly; ⑥ Find problems and deal with them in time.
