常见问题:什么是工程关键评估(ECA)?

How can we help you with 工程关键评估(ECA), what are the benefits for you? Our experts can help deepen your knowledge about ECA and its benefits by answering some of the most frequently asked questions.

什么是ECA?

An 工程关键评估(ECA) is part of a Fitness For Service (FFS) philosophy which considers flaws in structures. This enables the significance of flaws to be assessed in terms of structural integrity. 一个缺陷, 在这种情况下, 有缺口吗?, 无效, 或裂纹, where we can apply the principles of 断裂力学 and fatigue.

谁可以使用ECA?

ECA can be implemented by anyone involved in the design, 制造, 构建, 焊接到通用代码. Integrity is ensured by testing to demonstrate generic compliance to minimum criteria.  

以统计概率为基础, 达到最小属性, a lot of the material supplied is significantly in excess of the minimum required properties which results in layers of unrecognized conservatism that is built into the basic code-compliant design. This can then be utilized moving through construction into operation where targeted ECAs can demonstrate safety and integrity when faced with unintended challenges.

从设计到制造和操作, an ECA can be used throughout the entire project lifecycle by a range of engineering industries. 

Is an ECA performed in accordance with a recognized standard?

There are standards that detail ECA methodology and processes. These are 基于 fundamental knowledge of 断裂力学 and fatigue and are the subject of internationally recognized standards.

For flaws in structures and especially welded structures, BS 7910 is the reference standard derived from historical work and validated by full-scale testing. API 579 is a more wide-ranging standard that covers many more FFS issues.

API 1104 Annex A and DNVGL-RP-F108 are much more specific to the topic of alternative weld flaw criteria for the 制造 of pipelines. These standards enable bespoke project-specific analyses to be performed to solve clearly identified problems.

Can you give typical examples where ECA can be implemented?

ECA can justify continuing service and remnant life in the event that flaws have been found in a structure. The same principles can be used as part of a failure investigation to understand what has gone wrong, 失败的机制, more optimistically what we could do better in the future.

Frequent use of ECA is as a 焊后热处理(PWHT) Waiver. As per the ASME Boiler Codes for WTs > 1 ¼, approximately 32mm, PWHT is required. However, an ECA can be performed to understand if PWHT will actually provide any benefit e.g. is the structure acceptable without the application of PWHT.

A more in-depth discussion of this example can be found in our 焊后热处理(PWHT) 案例研究. 

除了, ECA can be used as part of a lean fitness for a service-based approach to manufacturing in particular as part of the manufacturing process to provide an alternative weld flaw acceptance criteria replacing arbitrary workmanship criteria in welds. 

做ECA的好处是什么?

Anywhere there is a flaw we can use the ECA / Fitness For Service (FFS) philosophy to demonstrate the structural integrity and provide justification of continuing service and remnant life in an aging asset. 

另外, we can use ECA as a more targeted tool to streamline manufacturing on an FFS basis to remove additional processes, 如PWHT和不必要的补焊, which will add cost and delay to a project with no overall integrity benefit to the asset.

im体育APP优势 

im体育APP提供了 工程关键评估(ECA) 基于 断裂力学 to allow engineers to demonstrate the safety of a structure or a component and reduce the probability of failure in engineering structures. 我们将先进的 材料测试 facilities in the US, UK, 欧洲, MEAP with our fully integrated ECA services.

作为其中的一部分 数字工程 服务im体育APP还包括 有限元分析(FEA), 计算流体动力学(CFD), 离散元建模(DEM), to help you define the most cost-effective inspection and repair plan for all your projects during design, 安装, 和操作.

额外的问题? 

如果你有问题没有回答, or if you require more information about 工程关键评估(ECA) 今天就联系专家.