港马输气管道因线路截断阀的放散管阀门漏气,需要更换阀门,为将经济损失降至最低采取了封堵技术。文中简介了封堵工艺的原理,并结合港马输气管道带压封堵更换阀门垫片施工,阐明了高压不停输封堵工艺的优点,为今后类似的管道工程施工提供借鉴。 Due to the leakage of the discharge pipe valve of the line cut-off valve, the Hong Kong-Macau Gas Pipeline needs to be replaced with a valve, and the plugging technology has been adopted to minimize the economic loss. In this paper, the principle of plugging process is briefly introduced. Combined with the construction of valve gasket replacement by pressure sealing in Hong Kong - Macau Gas Pipeline, the advantages of high pressure non - stop plugging technology are expounded, which can provide reference for similar pipeline construction in the future.