External protective pipe in directly buried pipeline system

A steam pipeline, Chinese and foreign technology, used in pipeline protection, protection of pipelines through thermal insulation, pipes/pipe joints/fittings, etc., can solve the problems of complex thermal insulation structure, failure of pipeline system life to meet expected requirements, and increased pipeline costs. To achieve the effect of convenient construction, simple method and lower total investment

Inactive Publication Date: 2006-11-15
于宁
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Problems solved by technology

In order to eliminate stress, the method of adding metal bellows expansion joints is usually used, but this method will increase the cost of the pipeline, complicate the insulation structure, and due to the limitation of the fatigue life of the bellows, the life of the pipeline system cannot meet the expected requirements.

Method used

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  • External protective pipe in directly buried pipeline system
  • External protective pipe in directly buried pipeline system

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Embodiment Construction

[0023] The present invention will be described in further detail below in conjunction with accompanying drawing

[0024] The composite outer protective pipe used for the directly buried thermal insulation steam pipeline in the present invention is made of figure 1 The inner steel conduit 1 shown in , the middle rigid polyurethane foam layer 2 and the outer layer 3 of fiber-wound reinforced thermosetting resin sanded glass fiber reinforced plastics are composed, and the said middle rigid polyurethane foam layer is realized by spraying . The outer surface of the steel conduit is completely isolated from the soil by the protective layer composed of fiber-wound reinforced thermosetting resin sand-filled FRP shell and sprayed rigid polyurethane foam, preventing corrosion of the outer surface of the steel conduit by various types of soil. The rigid catheter 1 is discontinuous and the width of the discontinuity is ≥ Δ1. In order to ensure the concentricity of the rigid catheter at t...

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Abstract

A middle and outer protective pipe of a directly buried steam pipeline system, characterized in that: the middle and outer protective pipe of the direct buried steam pipeline system is composed of a fiber-wound reinforced thermosetting resin sand-filled glass fiber reinforced plastic outer layer, a middle rigid polyurethane foam layer and an inner steel conduit. In the said system, the inner steel conduit in the composite outer protective pipe is discontinuous. Since the composite outer protective pipe in the direct buried steam pipeline system is discontinuous, the discontinuity is enough to release the temperature difference stress of the steel conduit. , which makes the direct-buried thermal insulation steam pipeline system with composite outer protection pipe more suitable for complex urban underground direct burial, and the construction is also convenient.

Description

Technical field: [0001] The invention relates to a composite outer protective pipe for directly buried thermal insulation steam pipelines. Background technique: [0002] With the adjustment of the national energy policy and the improvement of environmental protection requirements for urban construction, the demand for directly buried thermal insulation steam pipes is increasing. The outer protective pipe of the directly buried thermal insulation steam pipeline is the key to the long-term reliable operation of the direct buried thermal insulation steam pipeline. The so-called outer protection pipe is just like the trench of the traditional underground pipeline, but the geometric size of this "trench (outer protection pipe)" is so compact that it can only accommodate the insulated steam pipe. The outer protective pipe of the early direct-buried thermal insulation steam pipeline continued to use the high-density polyethylene shell of the direct-buried hot water pipeline. Due t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16L59/15
Inventor 于宁任景鑫
Owner 于宁
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