Liquefied natural gas power driving vessel gas supply system double-wall pipe construction process

A technology for liquefied natural gas and construction technology, applied in the field of construction technology, can solve problems such as rework, long gas supply pipelines, and failure to meet inspection requirements, and achieve the effects of improving efficiency, reducing construction costs, and reducing rework phenomena.

Active Publication Date: 2017-01-11
NO 711 RES INST CHINA SHIPPING HEAVY IND GRP
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Problems solved by technology

[0004] The gas supply pipelines of natural gas fueled ships are generally relatively long, and many places need to pass through complex areas such as the engine room, and must meet the requirements of 100% weld radiographic inspection of the inne...

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  • Liquefied natural gas power driving vessel gas supply system double-wall pipe construction process

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[0036] The application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain related inventions, rather than to limit the invention. It should also be noted that, for ease of description, only parts related to the invention are shown in the drawings.

[0037] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and embodiments.

[0038] A construction technique for a double-wall pipe of a liquefied natural gas-powered ship gas supply system, including an infield construction technique and an outfield construction technique:

[0039] Described infield construction technique comprises the following steps:

[0040] 1) Comple...

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Abstract

The invention discloses a liquefied natural gas power driving vessel gas supply system double-wall pipe construction process. An internal field construction process includes the steps: 1) completing a construction design scheme and drawing according to a liquefied natural gas supply system drawing; 2) purchasing right-angled bends and manufacturing inner pipes, outer pipes and supporting devices according to the construction design drawing; 3) manufacturing double-wall pipe right-angled bend prefabricated parts. An external field construction process includes the steps: 1) manufacturing double-wall pipe straight sections by a pre-nesting process; 2) welding and closing the double-wall pipe right-angled bend prefabricated parts and the inner pipes of the double-wall pipe straight sections, and performing 100% radiographic inspection for welds; 3) performing air pressure test under design pressure; 4) actually measuring inner pipe closure welds and the length of a shooting position, manufacturing outer pipes at the shooting position, mounting the outer pipes, welding joints and performing routine inspection for the welds. Reworking is decreased, vessel construction efficiency is greatly improved, and construction cost is reduced.

Description

technical field [0001] The disclosure relates to a construction technology, in particular to a construction technology of a double-walled pipe for a gas supply system of a liquefied natural gas-powered ship. Background technique [0002] LNG (liquefied natural gas, Liquefied Natural Gas) gas supply pipeline, as an important system of natural gas fueled ships, is a pipeline system that supplies normal temperature natural gas generated by LNG vaporizers to natural gas engines. Due to the flammable and explosive properties of natural gas, once the gas supply pipeline leaks, it will cause heavy losses to the entire LNG-powered ship. Double-wall pipes should be used, that is, the air supply pipeline is installed in the ventilation pipe, and an independent mechanical exhaust fan is installed in the space between the air supply pipeline and the ventilation duct to realize forced ventilation, so as to ensure the safety of the air supply system. [0003] Combined with the current ac...

Claims

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Application Information

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IPC IPC(8): F16L9/18
CPCF16L9/18
Inventor 张霞云马宁姚巍周军龚礼东
Owner NO 711 RES INST CHINA SHIPPING HEAVY IND GRP
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