KR-102964220-B1 - JACKETED COMPOSITE HOSE FOR LESS-ICING

KR102964220B1KR 102964220 B1KR102964220 B1KR 102964220B1KR-102964220-B1

Abstract

The present disclosure relates to a composite hose for reducing freezing with a jacket. A composite hose according to one embodiment of the present disclosure may include an inner coil, a reinforcing layer, an outer coil, and a jacket tube configured to block the penetration of external moisture when the outer coil is wrapped around the outer coil in an outer direction and contracted. The jacket tube is configured to allow dynamic displacement of the outer coil during the extension and restoration process of the hose, and the hose may be configured to withstand repeated pressure restoration cycles without collapse even under conditions of an internal temperature of 163 °C and an outer wall temperature of 100 °C.

Inventors

김경일

Assignees

주식회사 상봉코포레이션

Dates

Publication Date: 20260513
Application Date: 20250828

Claims (20)

As a composite hose, Inner coil; Reinforcement layer; outer coil; and It includes a jacket tube configured to block the penetration of external moisture when the outer coil is wrapped around the outer circumference and contracted. The jacket tube above is, A composite hose characterized by being configured to allow dynamic displacement of the outer coil during the elongation and restoration process of the composite hose by adhering closely to the surface of the outer coil to suppress the formation of an ice layer, and by inducing the composite hose to be restored in synchronization with the inner coil and the outer coil maintaining the same pitch by the jacket tube, thereby enabling it to withstand repeated pressure restoration cycles without collapse even under conditions of an internal temperature of minus 163°C and an outer wall temperature of minus 100°C.
In paragraph 1, A composite hose characterized in that the jacket tube is a heat shrink tube.
In paragraph 2, A composite hose characterized in that the material of the heat-shrink tube is composed of at least one of PFA, FEP, Polyolefin, PTFE, PVDF, ETFE, and Viton.
In paragraph 2, A composite hose characterized by the heat shrink tube having a shrinkage rate of 1.3 to 2.0 times.
In paragraph 2, A composite hose characterized by the thickness of the heat shrink tube being 0.3 mm or more and 1.5 mm or less.
In paragraph 1, A composite hose characterized in that the outer coil is composed of SUS316 steel wire with a tensile strength of 1200 MPa or more.
In paragraph 1, A composite hose characterized by being designed so that the pitch of the inner coil and the outer coil is maintained identically, and configured to allow an elongation rate of within 7% at operating pressure.
In paragraph 1, A composite hose characterized by the above reinforcing layer being configured to cross-laminated a polyester film and a polyamide fabric.
In paragraph 1, A composite hose characterized by the total thickness of the reinforcing layer being 1.5 mm or less.
In paragraph 1, A composite hose characterized by being configured to meet the ISO 28017 pressure resistance standards.
In paragraph 1, A composite hose characterized in that the jacket tube is configured to include an adhesive liner to maintain the interfacial thermal resistance with the outer coil at 0.05 K·m²/W or less.
In paragraph 1, A composite hose characterized by having an outer diameter of 1 inch or more and 12 inches or less.
In paragraph 1, The above composite hose is characterized by being configured to allow a strain of 30% or less at a burst pressure of 105 bar.
In paragraph 1, A composite hose characterized in that the couplings at both ends of the composite hose include a floating sleeve structure for absorbing axial shear pressure.
In paragraph 1, A composite hose characterized by the outer surface of the jacket tube being configured to suppress condensation by adjusting the surface energy to 20 mN/m or less.
As a method for manufacturing a composite hose, A step of forming an inner coil by helically winding a stainless steel wire; A step of forming a reinforcing layer by cross-laminating a cryogenic durable film and a fabric in 10 to 70 layers; A step of winding an outer coil on the outer surface of the reinforcing layer to have the same pitch as the inner coil; A method for manufacturing a composite hose comprising the step of inserting a jacket tube onto the outer coil in a sleeve manner and then heating and shrinking it to make it adhere closely to the outer coil.
In Paragraph 16, The step of being in close contact with the outer coil above is, A method for manufacturing a composite hose characterized by being performed with hot air at a temperature of 90 °C or higher and 230 °C or lower.
In Paragraph 16, A method for manufacturing a composite hose, further comprising a coil stress relief step in which a mandrel is configured to relieve stress in the inner coil.
In Paragraph 16, A method for manufacturing a composite hose characterized by the fact that the inner and outer coils are configured to be selectively determined between winding in the same direction or in opposite directions.
As a cryogenic fluid transfer system including a composite hose, Even if a water spray is applied during the drain and purging stages after transferring LNG through the composite hose, the jacket tube is in close contact with the outer coil to suppress the formation of an ice layer, thereby allowing dynamic displacement of the outer coil and preventing pitch mismatch between the inner coil and the outer coil, so as to maintain the simultaneous restoration of the inner and outer coils. A system characterized in that the jacket tube is configured to prevent hose collapse through the induction of simultaneous restoration.

Description

Jacketed Composite Hose for Less Icing The present disclosure relates to a composite hose for reducing freezing with a jacket, and more specifically, to an anti-freezing hose that blocks external moisture penetration and suppresses freezing and ice layer formation by utilizing a hydrophobic synthetic plastic material and a hydrophobic heat-shrink jacket, and ensures durability through a combination of a high-tension coil and a cross-reinforcement layer. Currently, composite hoses for LNG transfer adopt a triple-layer structure consisting of an inner stainless steel coil, a film/fabric reinforcement layer, and an outer coil to ensure stability and durability in cryogenic environments. This structure is designed to withstand operating pressures of up to 21 bar and burst pressures of 105 bar, allowing for pressure-elongations of 7% and 30%, respectively. However, during the LNG transfer process, the internal temperature of the hose is maintained at approximately -163°C and the outer wall temperature at approximately -100°C, causing atmospheric water vapor to condense and form frost. The initial frost layer consists of loose ice crystals with a density of approximately 0.1–0.2 g/cm³; while this partially blocks transfer, it does not significantly affect structural stability. However, when a water spray is applied during the LNG draining and purging process, the frost layer transforms into a high-density ice layer (density approximately 0.9 g/cm³). This restricts the displacement of the outer coil and the fabric cover, increasing the likelihood of structural collapse of the hose. In particular, the high-density ice layer inhibits the displacement of the outer coil, causing a pitch mismatch between the inner and outer coils, which can lead to a domino effect of structural collapse. This problem can occur repeatedly during the draining and purging stages of LNG transfer, thereby reducing the reliability and safety of the hose. In addition, a large temperature difference between the fluid inside the hose and the outer wall in a cryogenic environment ( T) causes continuous condensation and freezing, resulting in thermal instability. This thermal instability accelerates structural damage to hoses and acts as a major cause of increased maintenance costs. The breakdown and wear of hoses shorten the replacement cycle, leading to increased operating costs. Existing technologies have attempted to prevent the ingress of external moisture by applying simple surface coatings or insulating tapes, but these methods have not been able to fundamentally block moisture penetration and freezing, thus failing to completely solve the problem. Figure 1 is a drawing showing the cross-sectional structure of an enlarged perspective view of a composite hose. Figure 2 is a drawing showing the composite hose in more detail. Figure 3 is a diagram showing the expansion and restoration state of the composite hose. Figure 4 is a diagram showing the expansion and restoration state of the composite hose. Figure 5 is a flowchart showing the transport of LNG. Figure 6 is a system diagram showing the operation of LNG transfer. Specific structural or functional descriptions of the embodiments are disclosed for illustrative purposes only and may be modified and implemented in various forms. Accordingly, actual implementations are not limited to the specific embodiments disclosed, and the scope of this specification includes modifications, equivalents, or substitutions included in the technical concept described by the embodiments. Terms such as "first" or "second" may be used to describe various components, but these terms should be interpreted solely for the purpose of distinguishing one component from another. For example, the first component may be named the second component, and similarly, the second component may be named the first component. In the following examples, singular expressions include plural expressions unless the context clearly indicates otherwise. In the following embodiments, terms such as "comprising" or "having" mean that the features or components described in the specification are present, and do not preclude the possibility that one or more other features or components may be added. In the following embodiments, when a part such as a layer, region, or component is described as being on or above another part, it includes not only cases where it is directly on top of another part, but also cases where another region, component, etc. is interposed in between. In the drawings, the size of components may be exaggerated or reduced for convenience of explanation. For example, the size and thickness of each component shown in the drawings are depicted arbitrarily for convenience of explanation, and therefore the present disclosure is not necessarily limited to what is depicted. Where an embodiment can be implemented differently, a specific sequence of operations may be performed differently from the order described. For example, two