JPS6148693A - Hose - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to hoses, and in particular, but not exclusively, to flexible hoses suitable for transporting corrosive fluids such as crude oil under high pressure. Regarding.

According to the invention, the hose consists of a polymeric composition containing red iron oxide (ferric oxide).

+bl Structure and operation of the invention The polymeric composition is 1 usually rubber-based;
The polymer composition is preferably mixed with particulate ferric oxide by a conventional processing method 1, for example, using a Banbury mixer.
00 parts of iron oxide, more preferably 20 to 50 parts of iron oxide.

Ferric oxide is a readily available and inexpensive material with relatively low toxicity, and its presence has two advantages:

It is possible to absorb an amount of hydrosulfite (resulting from the presence of hydrogen sulfide) and carbonic acid (resulting from the presence of carbon dioxide). This is particularly advantageous when materials such as ears or cables and/or filter fabric layering which would otherwise be adversely affected by acid attack are also included.

(2) It can act as a visual indicator by changing color from red to black upon contact with hydrosulfite or carbonic acid.

An important feature of the present invention is that the polymeric composition containing iron oxide is capable of forming a barrier between something that is subject to chemical attack and something that needs to be protected from such attack. The most common attack is acid attack from the working fluid within the hose, and hose components such as metal or fabric are particularly susceptible to this attack. ## As a metal reinforcement layer.

Although material or glass is usually used for hoses.

In a preferred embodiment of the invention, the hose components to be protected are each radially inwardly and outwardly at least one
They are embedded in a matrix of a polymeric composition containing iron oxide reaching a thickness of u, preferably in each case reaching a thickness of 2 to 10 MJl.

Typically, the iron oxide-containing polymeric composition is in a circumferential continuous layer of substantially uniform thickness.

In another aspect of the invention, the component to be protected is not embedded in the matrix, but is adjacent to or in close proximity to the iron oxide-containing polymeric composition, e.g., sandwiched between two such compositions. (See above for preferred composition thicknesses.)

Often referred to herein as a polymer composition containing iron oxide? However, there are several such compositions in the hose structure, such as a hose with a metal wire or cable embedded in one iron oxide layer and a fabric layer in another iron oxide layer. It should be understood that this may include:

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the invention will now be described by way of embodiments shown in the drawings.

Flexible hoses for transporting crude oil under high pressure are
The outer support layer 16 includes a layer of oil-resistant elastomer disposed between the inner metal support layer 12 and the outer support 1d16. It consists of a high tensile strength metal cable embedded in a matrix of chloroprene rubber composition. Layer 19 is another support layer made of rayon fabric embedded in the same iron oxide containing rubber composition. The hose also comprises a two-part outer covering 1-20 consisting of an inner layer 20B of polychloroprene rubber and an outer layer 2OA of the rubber composition comprising said iron oxide.

A length of flexible pipe of this construction was equipped with an internal heater and its ends were sealed with suitable fittings before filling with crude oil Y75tI). The remaining volume is filled with gaseous hydrocarbons (
1000 psi' (6894 k
N/m2). Immerse the pipe in a 5°G water bath,
By raising the temperature of the pipe contents to 100°C by an internal heater, the internal pressure Y 30DOpsi (2
0,682kN/yn2). The pipe was allowed to cool and then reheated. This heating/cooling cycle was repeated every 12 hours and the oil fill was changed every two weeks. 1 test
After one month, the system was shut down and the pipes were examined for deterioration or leakage, but no abnormalities were found. Pipes of the same construction, except without the presence of Red Garla, failed in a much shorter period of time, usually after 7 to 14 days.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a flexible hose according to the invention. 11: Oil-resistant elastomer 1- 12: Inner metal support layer 16: Outer support layer 18 Bimetallic cable 19: Rayon cloth support layer 20: Outer coating 1- 2OA = Outer layer of rubber composition containing iron oxide 20B: Rubber composition Inside the object j Patent applicant: Dunlop Limited (5 others)

Claims (10)

[Claims] (1) A hose characterized by being made of a polymer composition containing ferric oxide. (2) A hose according to claim 1, characterized in that the polymer composition contains 5 to 100 parts of diiron oxide based on 100 parts of the polymer. (3) A hose according to claim 1, characterized in that the polymer composition contains 20 to 50 parts of ferric oxide based on 100 parts of polymer. (4) A hose according to any one of claims 1 to 3, characterized in that the polymer composition containing iron oxide is a continuous layer in the circumferential direction. (5) A hose according to any one of claims 1 to 4, characterized in that the polymer composition containing iron oxide extends in the radial direction to a thickness of at least 1 mm of the hose. . (6) A hose according to any one of claims 1 to 4, wherein the iron oxide-containing polymer composition extends in the radial direction to a thickness of at least 2 mm to approximately 10 mm of the hose. A hose characterized by: (7) A hose according to any one of claims 1 to 6, characterized in that it includes a reinforcing layer. (8) The hose according to claim 7, wherein the reinforcing layer is made of metal. (9) A hose according to claim 7 or 8, characterized in that the reinforcing layer is embedded in a matrix of a polymer composition containing iron oxide. (10) A hose according to any one of claims 1 to 9, characterized in that the hose has a component embedded in a matrix of a polymer composition containing iron oxide.