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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The standard covers dimensions and gaging of plastic tapered National Pipe Threads (NPT) for leak-tight joints, and it is now referenced in all ASTM Standards for plastic piping products.

这个标准涵盖塑料美国锥管螺纹(NPT)的尺寸和计量方法，用于泄漏密封连接，现在已在所有有关塑料管道产品的ASTM标准中引用。

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V47 temperature actuated valve features light weight, small volume and long life. The valve body is made of high temperature seal components for avoiding valve body Hugging tight or leak.

V47温度调节阀体积小，重量轻，安装简便，使用寿命长，阀体密封采用V型环高温密封组件，可防止阀杆过紧抱死或漏气的可能性。

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Used fuel that has been cooled in a spent fuel pool for at least five years can be put into a container called a cask and surrounded with inert gas, providing leak-tight containment, according to the U.S. Nuclear Regulatory Commission.

CNN: Nuclear disasters: Is the fear realistic?