Hydrogen economy considers hydrogen as a substantial fraction of a nation's energy and services. This could happen in the future if hydrogen can be produced from domestic energy sources economically and in an environmental-friendly manner.

Hydrogen can also be used as fuel in stationary fuel cell systems for buildings, emergency power or distributed generation. Hydrogen transport is generally made by pipelines. This solution is preferable than transport on road by truck for security reasons.

The addition of hydrogen in natural gas could have an impact on the materials degradation over time especially those used for the storage, transport and distribution of natural gas. The compatibility of these materials with natural gas including of hydrogen is dependent on the proportion of hydrogen added into the gas and is assessed with regard to several criteria:

- permeation of hydrogen through metallic materials;

- loss of integrity of these materials and adaptation of follow-up actions in service, surveillance and maintenance of equipment.

This paper is devoted to the effect of hydrogen embrittlement (HE) caused by adding hydrogen into natural gas network on its design, maintenance, supervision and maximum allowable service pressure (MAOP) for smooth and damaged pipes.

氢经济认为氢是一个国家能源和服务的重要组成部分。如果将来可以经济和环保的方式从家庭能源中生产氢气，则可能会发生这种情况。

氢气也可以在建筑物，应急电源或分布式发电的固定式燃料电池系统中用作燃料。氢运输通常通过管道进行。出于安全原因，此解决方案比在卡车上公路运输更可取。

天然气中添加氢气可能会对材料随时间的推移产生影响，特别是那些用于存储，运输和分配天然气的材料。这些材料与天然气（包括氢气）的相容性取决于添加到气体中的氢气的比例，并根据以下几个标准进行评估：

-氢气透过金属材料渗透；

-这些材料的完整性丧失，并且无法适应设备的维修，监视和维护中的后续行动。

本文致力于通过在天然气网络中添加氢气对氢气的脆化（HE）的影响，对其设计，维护，监督和平滑和损坏的管道的最大允许使用压力（MAOP）产生影响。