A carbon steel liner is utilized to provide a leakproof vapor barrier for containment of concrete construction.
为防止混凝土结构的安全壳泄露,其内部有碳钢的衬垫。
2
Closure flanges may be mechanically seamed or welded in place. Gaskets or other sealing elements shall be used with closures, unless the closure is inherently leakproof.