| 摘要 |
A pipe has a steel tube (10) as pressure containment, and a plastic liner (12). A porous substrate (16) is interposed between the tube (10) and the liner (12). Gas permeating through the liner (12) can pass through the porous substrate (16) to vent via bleed holes (18). The exterior of the tube (10) may be protected by a porous covering (20).
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