5.11　Painting Works for Process Steel Structure

Ⅰ　Dominant Items

5.11.1　The type and model of paint，thinner and hardener shall meet the requirements in the design documents and current national standards for products.Any product beyond validity period shall be reinspected.

Check quantity:full check.

Check method:check the quality certificate documents or re-inspection report.

5.11.2　The de-rusting grade shall meet the requirements in the design documents before painting.The steel shall have no slag，crater，ash，oil stain，water or burr on the surface.When not specified，the derusting grade on surface of steel shall meet the requirements in current national standard GB 50205 Code for Acceptance of Construction Quality of Steel Structures.

Check quantity:10% random check for elements of same type，and at least 3 pieces.

Check method:check with a shovel and check with photo comparison according to current national standard GB 8923 Rust Grades and Preparation Grades of Steel Surfaces before Application of Paints and Related Products.

5.11.3　The paint，painting passes，painting thickness shall meet the requirements in the design documents or product instructions.When the painting thickness is not specified in the design，the total dry film thickness of painting layer:150μm for indoor application and 125μm for indoor application.The allowable deviation is-25μm.The allowable deviation in dry film thickness of each painting layer is-5μm.

Check quantity:10% random check for elements of same type，and at least 3 pieces.

Check method:check with a dry film thickness gauge.5 points for each element，take the average of measured dry film thickness at 3 points that are 50mm spaced.

5.11.4　The type，specifications，performance and coating technical requirements of heat-resisting and anti-corrosive paint on hot-blast stove shall meet the requirements in the design documents and current national standards for products.Any product beyond validity period shall be re-inspected.

Check quantity:full check.

Check method:check the quality certificate document or re-inspection report of the product.

Ⅱ　General Items

5.11.5　The identification，mark and serial number on the elements shall be clear and complete after painting.

Check quantity:full check.

Check method:visual check.