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On-line Repair Method of Corrugated Compensator in Gas Pipeline

A corrugated compensator and repair method technology, applied in the direction of pipe components, pipes/pipe joints/pipe fittings, mechanical equipment, etc., can solve problems such as corrosion and compensator damage, and achieve the effect of ensuring safety

Inactive Publication Date: 2011-11-30
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the medium in the pipeline changes with the environment, it will cause the expansion and contraction of the pipeline. After a long period of use, the compensator wil

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0014] Embodiment: This embodiment repairs the pre-valve compensator of the No. 5 blast furnace DN2800 in the transmission and distribution operation area of ​​Shanxi Taigang Stainless Steel Co., Ltd. Energy and Power Plant.

[0015] 1. When the compensator is found to have corrosion leakage, first plug the leak point with wooden nails, or smear yellow mud to plug the leak.

[0016] 2. According to the shape and wave number of the compensator to be repaired (the wave number of the compensator before the DN2800 plate valve of the fifth blast furnace is 2 waves), select a new compensator with a diameter of 3000mm, and cut the new compensator into eight pieces of supplementary materials on average. A release pipe is welded on the outer side of a piece of filling material close to the wave crest of the cut, 2m higher than the wave crest.

[0017] 3. Go to the site to splice eight pieces of supplementary material and set them on the periphery of the old compensator, and set one pie...

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Abstract

An online repair method of a gas pipe corrugation compensator is mainly applied for the repair of a corrugation compensator on a gas overhead pipeline. The method mainly comprises the following steps of: (1) firstly stopping leaking of a leak source of the compensator; (2) selecting a new compensator which is the same as the old compensator in shape and wave number but 200 mm greater than the oldcompensator in diameter, and then averagely cutting the new compensator into eight pieces of repair materials, wherein a bleeder is welded in a wave peak in the vicinity of a cut outside one piece ofrepair material, which is 2 m higher than the wave peak; and (3) jointing the eight pieces of repair materials in field and nesting the repair materials to the periphery of the old compensator, wherein the repair material with the bleeder is sleeved to the topmost side of the preceding compensator (ensuring the bleeder to be in a vertical state). A continuous weld is employed for welding; during the welding, nitrogen is introduced into the cavity of the new compensator and the pressure of the nitrogen is 0.6 MPa; a flow rate is decided by the calibre of a pipe in which nitrogen is introduced and then coke oven gas is evicted. The online repair method disclosed by the invention cannot cause stopping of a pipeline to affect production.

Description

technical field [0001] The invention is mainly used for repairing corrugated compensators on gas overhead pipelines, and in particular relates to an online repair method for pipeline corrugated compensators. Background technique [0002] Ripple compensator belongs to a kind of compensating element. Utilize the effective expansion and contraction deformation of the bellows of its working body to absorb the dimensional changes of the pipeline caused by thermal expansion and contraction, creep and other reasons. [0003] At present, the gas pipelines and compressed air pipelines used by iron and steel enterprises are equipped with compensators. Because the medium in the pipeline changes with the environment, it will cause the expansion and contraction of the pipeline. After a long period of use, the compensator will be damaged or corroded and trachoma will appear. If the gas leaks, it will be very harmful. Therefore, it is meaningful to repair or replace the compensator in ti...

Claims

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Application Information

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IPC IPC(8): F16L55/168
Inventor 刘学慧辜庆九李月明王瑞红
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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