【正文】 nuclear power industries. The application of anticorrosion liners and anticorrosion coatings must be proceeded according to design documents. The consent by the design institute must be obtained when it is necessary to change the design, substitute a material or use a new material. The raw materials used for anticorrosion works must conform to the provisions in state professional standards or in this code, and have exworks certificates and inspection data. When necessary, raw materials shall be reinspected on a sampled basis. The construction formulation for various anticorrosion works can be used only after test qualification certificate has been issued by a testing institute with Grade II certificate qualification. The determined construction formulation must not be changed without authorization. The construction safety technology and labor protection for anticorrosion works shall also conform to the provisions in relevant current standards and codes of the state, in addition to the provisions herein. 2. Basic Provisions General Provisions The application of anticorrosion works can be started only with the following conditions have been satisfied: Design and other technical documents are plete, and construction drawings have been jointly reviewed。 Construction scheme and technical instructions have been pleted, and safety technical education and necessary technical training have been performed。 Equipment, pipes and fittings have the exworks certificates or process handover certificates。 Materials, machinery and equipment, testing instruments and construction facilities and ground are ready。 Protection facilities are safe and reliable, and the water, power, gas and steam — 5 — supplies can meet the needs of continuous works. The fabrication of equipment, pipes and fittings must meet the requirements on construction drawings and design documents. An overall inspection and acceptance must be performed before starting the anticorrosion works. During the application of anticorrosion works, intermediate inspections must be performed. Acceptance shall be performed immediately after pletion of anticorrosion works. The welding of equipment, pipes and fitting external wall accessories must be pleted before the anticorrosion works, and be verified to be correct。 during the proceeding of anticorrosion works, operations such as welding, gas cutting and direct knocking shall be strictly forbidden. Before implementing anticorrosion works on rotary equipment, test reports on static balance or dynamic balance shall be provided. After pletion of anticorrosion works, verification inspection on static balance or dynamic balance shall be performed. Before implementing anticorrosion works on pressurized equipment, pipes and fittings, strength or air tightness tests must be performed according to relevant provisions, and the anticorrosion works can be started only when the tests are qualified. To ensure safety or convenience in the application of anticorrosion works, manholes must be provided for enclosing equipment that cannot be dismantled. The sizes and quantities of manholes shall be determined according to the equipment volume and diameter. There shall be at least 2 manholes. Upon pletion of anticorrosion works, the equipment, pipes and fittings must not be hit or damaged during lifting and handling, and they shall be properly cared for before use. Requirements on Base There must be no trace of damage, blowhole, inclusive slag, overlapping skin or serious corrosion spot on the steel surface of steel equipment, pipes and fittings。 the machined surface must be flat, with local concave and convex points on the surface not exceeding 2mm. Equipment, pipes and fittings made of cast iron or cast steel shall have no void or porous base. Any sharp angle or edge, rough edge or casting residual on the surface of equipment, pipes and fittings must be thoroughly ground and cleaned, and the surface shall be flat and smooth, with curved transitions. Equipment nozzles must not go beyond the internal surface, and covers, column sections and insertion pipes for equipment shall be connected with flanges. Riveting seams in equipment with riveting connection shall be flat, and blind rivets shall be used, so that there is no protruding rivet head inside the equipment. — 6 — Leakage testing holes shall be provided when necessary for equipment, pipes and fittings with anticorrosion liners, and vent holes shall be provided at proper locations. After surface pretreatment, the base shall be pletely inspected, and process takeover formalities shall be handled. The anticorrosion works can be started only after signatures have been made. Requirements on Welding For equipment housing, doubleside butt welding should be used. The welding seams shall be flat and free of blowhole, overlapping or inclusive slag. The weld seam height must not be greater than 2mm. Welding spillages shall be thoroughly removed. Weld seams should be ground level or to a curved transition [Fig. – (1)]. Continuous welding must be adopted for weld seams on equipment housing, and there must be no crack or continuous undercut in the weld seam, and the nipping depth shall not exceed . The welding requirements shall be ensured for the equipment corners and nozzles, and the seams shall be saturated, and be ground to an obtuse angle, to form a curved transition. There must be no burr or sharp angle. For the round corner of fillet weld seams, the welding height shall be H≥ 5mm, for ordinary outer corners, R≥ 3mm, and for internal corners, R≥ 10mm [Fig. – (2), (3) and (4)]. In cleaning pairing clamps, it is strictly forbidden to damage the base metal. It is strictly forbidden to initialize the arc on the base me