Flexible duct having no appreciable variation in length under th

Details Flexible duct having no appreciable variation in length under th Flexible duct having no appreciable variation in length under th

1988-11-22

1993-01-05

Recla, Henry J.

Pipes and tubular conduits

Flexible

Spirally wound material

F16L 1124

Patent

active

051761793

ABSTRACT:
A reinforced flexible duct, particularly for transporting pressurized fluid having an internal pressure reinforcement and a traction resisting reinforcement. The internal pressure reinforcement is wound at a high angle with respect to an axis of the duct and the traction resistant reinforcement comprises at least a pair of crossed layers wound at an angle of at most equal to 55.degree.. A ratio of stiffness traction resisting reinforcement to a stiffness of internal pressure resisting reinforcement is between 2.5 and 8 with a winding angle of the pair of cross layers of the traction resisting reinforcement having a value of between 20.degree. and 50.degree.. A ratio K.sub.t /K.sub.p of stiffness and the winding angle .alpha. satisfy the relationship: ##EQU1##

REFERENCES:
patent: 4343333 (1982-08-01), Keister
patent: 4344462 (1982-08-01), Aubert et al.
patent: 4402346 (1983-09-01), Cheetham et al.
patent: 4403631 (1983-09-01), Abdullaev et al.
patent: 4431034 (1984-02-01), Abdullaev et al.
patent: 4522235 (1985-06-01), Kluss et al.

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