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首页> 外文会议>4th International Pipeline Conference, Sep 30-Oct 3, 2002, Calgary >DOUBLE BLOCK AND BLEED AND THE EFFECTS OF ITS DEFINITIONS ON PIPELINE SAFETY
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DOUBLE BLOCK AND BLEED AND THE EFFECTS OF ITS DEFINITIONS ON PIPELINE SAFETY

机译：双嵌段和双排及其定义对管道安全的影响

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Double Block and Bleed (DBB) is the term commonly used to describe the systems or valving arrangements that provide double barrier pressure isolation of those performing work on a pipeline system downstream of the barrier. The consequences of releasing pipeline pressure downstream to an unsuspecting maintenance crew go without stating. If the risks are so high as to demand not single, but double barrier isolation between the fury of pipeline pressure and the safety of personnel and equipment, why then has it been so difficult to develop a consensus for the definition or description of DBB systems? This paper will explore in detail the internationally published definitions for DBB and analyze their merits with respect to pipeline safety. Definitions from organizations such as the American Petroleum Institute (API), Occupational Health and Safety (OHSA), the International Standards Organization (ISO) will be reviewed to determine what they contribute or fail to contribute to the intent of worker protection. Some Provincial Governments have written specific requirements for pipeline isolation into law, while others do not address the matter. These issues will also be explored and compared to the practices of companies operating oil and gas pipelines. Some insight on the division of definitions is offered through an understanding of the purposes or needs of the definer. For example, a valve manufacturer with a need to demonstrate that his valve will indeed block flow from both directions and thereby permit maintenance of the valve without removal from the pipeline may not fully appreciate the pipeline maintenance employee's need to isolate himself from pipeline pressure by two independent barriers. It will be shown that standards and specifications are available to support both perspectives and that there are compelling reasons for deriving commonality between these perspectives. With the development of International Standards for oil and gas pipelines and increasing emphasis on the harmonization of various national standards, matters such as operator safety must not be compromised. Interesting opportunities exist to revisit topics such as definitions for DBB and perhaps derive a set of words that allows consensus and encompasses the true intent of the concept.
机译：双堵漏（DBB）是一个术语，通常用于描述系统或阀门装置，该系统或阀装置为在屏障下游的管道系统上进行工作的人员提供双重屏障压力隔离。毫无疑问地向下游的维护人员释放了下游的管道压力的后果。如果风险如此之高，以至于在管道压力的愤怒与人员和设备的安全性之间不仅仅要求隔离，而且要求双重屏障隔离，那么为什么很难对DBB系统的定义或描述达成共识？本文将详细探讨国际上发布的DBB定义，并分析它们在管道安全方面的优点。美国石油协会（API），职业健康与安全（OHSA），国际标准组织（ISO）等组织的定义将受到审查，以确定它们对保护工人意图的贡献或不贡献。一些省政府已对将管道隔离化成法律制定了具体要求，而另一些省政府则未解决此问题。这些问题也将进行探讨，并与经营石油和天然气管道的公司的做法进行比较。通过理解定义者的目的或需求，可以对定义的划分提供一些见识。例如，某个阀门制造商需要证明他的阀门确实会阻止双向流动，从而允许在不从管道上拆下的情况下进行阀门维护，可能无法完全理解管道维护人员将自己与管道压力隔离2倍的需要。独立壁垒。将显示标准和规范可用于支持这两种观点，并且存在令人信服的理由来推导这些观点之间的共性。随着石油和天然气管道国际标准的发展以及对各种国家标准的统一化的重视，诸如操作员安全之类的问题一定不能妥协。存在有趣的机会来重新讨论诸如DBB的定义之类的主题，并可能衍生出一组可以达成共识并包含该概念真正含义的词语。

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