Low temperature, high pressure rubber hose
View Patent ↗Flexible reinforced rubber hose adapted for conveying fluids under low temperatures and high pressures. The hose includes a inner tube formed of an acrylonitrile butadiene rubber (NBR) or other low temperature rubber compound having an elastic modulus of not greater than about 8.4 MPa (1200 psi), and an outer jacket formed of a chloroprene rubber (CR) or other low temperature rubber compound having a durometer of not greater than about 75 Shore A.
1. A hose for use at a service temperature range of between about −57° C. (−70° F.) and about +100° C. (+212° F.) and a service pressure range of between about 28.0 MPa (4000 psi) and up to about 56.0 MPa (8000 psi) comprising:
an inner tubular core comprising a layer of a first rubber compound comprising an acrylonitrile butadiene rubber (NBR) or a copolymer or blend thereof having an elastic modulus of not greater than about 8.4 MPa (1200 psi);
at least a first pair of spiral wound reinforcement layers surrounding the core comprising a first reinforcement layer and a second reinforcement layer surrounding the first reinforcement layer; and
an outer jacket surrounding the second reinforcement layer comprising a layer of a second rubber compound having a durometer of not greater than about 75 Shore A.
2. The hose of claim 1 wherein:
the first reinforcement layer comprises one or more filaments of a first metal or metal alloy wire; and
the second reinforcement layer lines comprise one or more filaments of a second metal or metal alloy wire fiber the same as or different than the first metal or metal alloy wire.
3. The hose of claim 1 wherein:
the first reinforcement layer is spiral wound in a first winding direction; and
the second reinforcement layer is spiral wound in a second winding direction opposite the first winding direction.
4. The hose of claim 1 wherein the hose has a central longitudinal axis and:
the first reinforcement layer is laid at positive angle relative to the longitudinal axis; and
the second reinforcement layer is laid at a negative angle relative to the longitudinal axis.
5. The hose of claim 1 wherein the second rubber compound comprises an chloroprene rubber (CR) or a copolymer or blend thereof.
6. The hose of claim 1 wherein the first rubber compound has an elastic modulus of not less than about 3.4 MPa (500 psi).
7. The hose of claim 1 wherein the first rubber compound has a durometer of not greater than about 80 Shore A and not less than about 70 Shore A.
8. The hose of claim 1 wherein the second rubber compound has a durometer of not less than about 60 Shore A.
9. A method of conveying fluid or pressure at a service temperature of between about −57° C. (−70° F.) and about +100° C. (+212° F.) and a service pressure of between about 28.0 MPa (4000 psi) and about 56.0 MPa (8000 psi) comprising the steps of:
(a) providing a length of a hose comprising:
an inner tubular core comprising a layer of a first rubber compound comprising an acrylonitrile butadiene rubber (NBR) or a copolymer or blend thereof having an elastic modulus of not greater than about 8.4 MPa (1200 psi);
at least a first pair of spiral wound first reinforcement layer surrounding the core comprising a first reinforcement layer and a second reinforcement layer surrounding the first reinforcement layer;
an outer jacket surrounding the second reinforcement layer comprising a layer of a second rubber compound having a durometer of not greater than about 75 Shore A; and
(b) conveying fluid or pressure through the hose at a service temperature of between about −57° C. (−70° F.) and about +100° C. (+212° F.).
10. The method of claim 9 wherein:
the first reinforcement layer comprises one or more filaments of a first metal or metal alloy wire; and
the second reinforcement layer lines comprise one or more filaments of a second metal or metal alloy wire fiber the same as or different than the first metal or metal alloy wire.
11. The method of claim 9 wherein:
the first reinforcement layer is spiral wound in a first winding direction; and
the second reinforcement layer is spiral wound in a second winding direction opposite the first winding direction.
12. The method of claim 9 wherein the hose has a central longitudinal axis and:
the first reinforcement layer is laid at positive angle relative to the longitudinal axis; and
the second reinforcement layer is laid at a negative angle relative to the longitudinal axis.
13. The method of claim 9 wherein the second rubber compound comprises an chloroprene rubber (CR) or a copolymer or blend thereof.
14. The method of claim 9 wherein the first rubber compound has an elastic modulus of not less than about 3.4 MPa (500 psi).
15. The method of claim 9 wherein the first rubber compound has a durometer of not greater than about 80 Shore A and not less than about 70 Shore A.
16. The method of claim 9 wherein the second rubber compound has a durometer of not less than about 60 Shore A.