To deal with corrosion at weld joint, shielded inert gas are will be used and the insulation grade raised.

采用非熔化极惰性气体保护焊，并提高焊口绝缘等级，克服焊口的晶间腐蚀。

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Avoid install the insulation joint on the vertical pipe.

绝缘接头避免安装在立管上。

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It is forbidden to lift pipe within 5 meters closed to the joint after insulation joint is connected to the pipe.

绝缘接头与管线连接后，不许在接头5米内起吊管线。

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Less successful but still profitable is Pittsburgh Corning, a joint venture with PPG Industries, that makes foam glass insulation and architectural glass blocks.

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