1. Rigid waterproof casing is suitable for non-metallic pipes and cast iron pipes, but should be adjusted according to the thickness of the pipe wall.
2. After wing ring and steel casing processing, the outer wall is painted once with primer (primer containing lead or cold primer oil).
3. The material weight listed in the casing size table is the weight of steel casing.
4. If there is no concrete wall, the casing through the wall should be changed to concrete wall. The diameter of Class II casing should be 200mm larger than the machine wing ring. casing is poured into the wall and the material in the casing should be pressed tightly.
5. the thickness of the concrete wall at the waterproof casing shall not be less than 200mm, otherwise the side or sides of the wall shall be thickened, the diameter of the thickened part shall be less than the diameter of the machine wing ring greater than 200mm. rigid waterproof casing shall be filled with oil hemp and asbestos cement.
