JP-7857074-B2 - Marine Horse

JP7857074B2JP 7857074 B2JP7857074 B2JP 7857074B2JP-7857074-B2

Inventors

玉田義典

Assignees

横浜ゴム株式会社

Dates

Publication Date: 20260512
Application Date: 20200318

Claims (2)

Between the inner rubber layer and the cover layer, there are a group of main reinforcing layers and a buoyancy layer laminated sequentially from the inner circumference, and connecting ends are provided at both ends in the longitudinal direction of the hose. Each of the aforementioned connecting ends has a nipple extending in the longitudinal direction of the hose and a flange joined to the longitudinal end of this nipple. In a floating-type marine hose, one end of the main reinforcing layer group is fixed to one nipple using a nipple wire at that end and a fixing ring protruding from the outer surface of one nipple, and the other end of the main reinforcing layer group is fixed to the other nipple using a nipple wire at that other end and a fixing ring protruding from the outer surface of the other nipple, A marine hose characterized in that the thickness of the buoyancy layer is 60 mm to 300 mm in portions other than the longitudinal ends of the hose, an auxiliary reinforcing layer group is laminated between the buoyancy layer and the cover layer to support the main reinforcing layer group, one end of the auxiliary reinforcing layer group is fixed to one nipple using a nipple wire at that end and a fixing ring protruding from the outer surface of one nipple, the other end of the auxiliary reinforcing layer group is fixed to the other nipple using a nipple wire at that other end and a fixing ring protruding from the outer surface of the other nipple, and another auxiliary reinforcing layer group is arranged inside the buoyancy layer, and its arrangement is at a position half the thickness of the buoyancy layer or further outward .
The marine hose according to claim 1, wherein each of the auxiliary reinforcing layer groups is a multi-layer structure of auxiliary reinforcing layers formed by aligning a large number of rubber-coated reinforcing cords in parallel, the longitudinal strength of the cords of the auxiliary reinforcing layer group is 250 kg/ply·cm or more and 900 kg/ply·cm or less, and the auxiliary reinforcing layer group laminated between the buoyancy layer and the cover layer has a lower reinforcing strength than the auxiliary reinforcing layer group arranged inside the buoyancy layer.

Description

This invention relates to a marine hose, and more specifically, to a marine hose that can ensure sufficient shock absorption performance while reducing the burden on the reinforcing layers that absorb impact when the main reinforcing layer group is damaged. The so-called double-carcass type is a well-known structure for marine hoses used to transport fluids such as crude oil between tankers at sea and land-based facilities. In a double-carcass type marine hose, a main reinforcing layer group (inner carcass layer group) and an outer carcass layer group are sequentially laminated between the inner rubber layer and the cover layer. Even if the main reinforcing layer group is damaged, if the outer carcass layer group remains intact, the outer carcass layer group can prevent the fluid leaking from the main reinforcing layer group from leaking outside the hose. If the main reinforcing layers are damaged, the internal pressure acting on the outer carcass layers can rise sharply. Therefore, the outer carcass layers must be designed to withstand such an impact. For this reason, the outer carcass layers are composed of a considerable number of stacked carcass layers, and reducing the number of layers is difficult. This also makes it difficult to reduce the weight of the marine hose. Therefore, a double-carcass type marine hose has been proposed to improve the shock absorption performance of the outer carcass layers while reducing the weight and cost of the marine hose (see Patent Document 1). The marine hose proposed in Patent Document 1 solves the above-mentioned problems by devising the specifications of the carcass cords used in the outer carcass layers. However, since a high level of shock absorption performance is required for the outer carcass layers in a double-carcass type marine hose, there are limitations to ensuring sufficient shock absorption performance simply by devising the specifications of the carcass cords. Therefore, it is necessary to increase the number of carcass layers in the outer carcass layers to a certain extent. Japanese Patent Publication No. 2013-249932 This is an explanatory diagram illustrating the marine hose of the present invention.This is an explanatory diagram illustrating a magnified, longitudinal cross-sectional view of a portion of the marine hose shown in Figure 1.Figure 2 is an explanatory diagram illustrating the cross-sectional structure of a marine hose, viewed from section A-A.This is an explanatory diagram illustrating an auxiliary reinforcement layer by cutting out a portion of the marine hose shown in Figure 1.This is an explanatory diagram showing a modified example of the auxiliary reinforcement layer in Figure 4.This is an explanatory diagram illustrating another embodiment of a marine hose, shown in a partially enlarged cross-sectional view.This is an explanatory diagram illustrating yet another embodiment of the marine hose, shown in a partially enlarged cross-sectional view. The marine hose of the present invention will be described below based on the embodiment shown in the figure. The embodiment of the marine hose 1 illustrated in Figures 1 to 3 is provided with connecting ends 2 at both longitudinal ends for connecting another marine hose 1. Each connecting end 2 has a nipple 2b extending in the longitudinal direction of the marine hose 1 and a flange 2a joined to one longitudinal end of the nipple 2b. Generally, about 8 to 10 marine hoses 1 are connected and used. The dashed line CL in the figures represents the centerline that passes through the center of the cross-section of the marine hose 1 and extends in the longitudinal direction of the hose. Note that while Figures 3, 6, and 7 show a 1/4 range of the marine hose 1's cross-section, the other ranges not shown (3/4 range) have the same structure. Between the nipples 2b at both ends of the marine hose 1, the inner rubber layer 3, main reinforcing layer group 4, main wire layer 5, buoyancy layer 6, auxiliary reinforcing layer group 7, and cover layer 8 are coaxially stacked on the outer circumference of the cylindrical flow path 1a (i.e., around the center line CL). The main reinforcing layer group 4, main wire layer 5, and auxiliary reinforcing layer group 7 are fixed to the nipples 2b by nipple wires 4w, 5w, and 7w at one end of each, and by fixing rings 2c protruding from the outer circumference of the nipples 2b. The inner circumferential surface of the inner rubber layer 3 becomes the fluid flow path 1a for the fluid L. Examples of fluid L include crude oil, gasoline, and LPG. The inner rubber layer 3 is made of a material appropriate to the type of fluid L. If the fluid L is crude oil, the inner rubber layer 3 is formed of nitrile rubber or a similar material with excellent oil resistance. The main reinforcement layer group 4 is composed of multiple main reinforcement layers 4A to 4H stacked together. The number of main reinforcement layers 4A to 4H is not limited to eight layers; the number of layers