초록 ▼

Outer wrap for pipelines is made of essentially flat thermoplastic fibers preferably woven in a basket weave pattern with from about 15 to 20 per cent of the fabric area being open. On wrapping a pipe freshly coated with coal tar or equivalent material, the wrap does not tend to sink into the coatin

Outer wrap for pipelines is made of essentially flat thermoplastic fibers preferably woven in a basket weave pattern with from about 15 to 20 per cent of the fabric area being open. On wrapping a pipe freshly coated with coal tar or equivalent material, the wrap does not tend to sink into the coating as is found to be the case with other outer wraps, such as those made from round glass fibers. Because of the ability of the mesh wrap of this invention to eliminate air entrapment during the wrapping operation, an essentially holiday-free coating results. This system also lends itself to uniform distribution of cathodic current over the entire surface. The tough, smooth wrapping does not allow cold flow of coating material through the fabric due to the weight of backfill and tension of the wrap.

대표청구항 ▼

The combination comprising a section of metal conduit coated with a layer of a cold flowable, adherent, waterproofing material over which is wound a continuous strip of a porous fabric woven of essentially flat thermoplastic fibers, said fabric having substantially uniform openings that provide appr

The combination comprising a section of metal conduit coated with a layer of a cold flowable, adherent, waterproofing material over which is wound a continuous strip of a porous fabric woven of essentially flat thermoplastic fibers, said fabric having substantially uniform openings that provide approximately 15 to 20 percent of the total area of said fabric.