3.5　Examination of Silicon-core Pipe and Accessories

3.5.1　Outer diameter，thickness and designated single-drum cablelength of the silicon-core pipe shall meet requirements in Table 3.5.1.

Table 3.5.1　Specifications for silicon-core pipe

3.5.2　Silicon-core pipes shall be evenly shaped and colored，without any damage，defect，scar，crack，obvious dent/bump or bubble.

3.5.3　Single-drum silicon-core pipe is pressurized to 0.1MPa，and 24hours later，the pressure drop shall be not greater than 0.01MPa.

3.5.4　Connecting piece shall be matched with the corresponding silicon-core pipe，and its inner/outer surface shall be smooth，defect-free，and seamlessly screw-connected.

3.5.5　Rubber plug shall not fall off or break and shall match corresponding silicon-core pipes；plugs shall be firmly installed，without any invasion of water or sundries.