| abstract |
The invention relates to an unbonded, flexible pipe having a length and comprising a tubular inner sealing sheath, at least one metal armor layer and an outer sealing sheath. The unbonded, flexible pipe comprises at least one insulated length section comprising a fluid permeable thermally insulating cover surrounding the outer sealing sheath in the insulated length section. The thermally insulating cover is further surrounded by a liquid permeable jacket, and preferably the thermally insulating cover is liquid permeable. Because the liquid permeable jacket is liquid permeable, no substantial external pressure will act on the liquid permeable jacket, and accordingly the liquid permeable jacket will substantially not carry any pressure induced forces further to the thermally insulating cover. The unbonded, flexible pipe will thereby be more flexible than corresponding insulated prior art unbonded, flexible pipes with a non-liquid permeable jacket. |