The pipes are used for carrying sewage, water, oil or gas. Therefore, the weld seams produced during the manufacture of the pipe must be absolutely leak tight.
用于传输城市污水，水，油或者天然气的管道在焊接时必须保证严格的密封以防止泄露。
The pipes are used for carrying sewage, water, oil or gas. Therefore, the weld seams produced during the manufacture of the pipe must be absolutely leak tight.
用于传输城市污水，水，油或者天然气的管道在焊接时必须保证严格的密封以防止泄露。
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