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首页> 外文会议>ASME(American Society of Mechanical Engineers) Pressure Vessels and Piping Conference 2006 vol.7: Operations, Applications, and Components >ESTABLISHING MINIMUM PRESSURIZATION TEMPERATURE (MPT) FOR HEAVY WALL REACTORS IN HYDROPROCESSING UNITS
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ESTABLISHING MINIMUM PRESSURIZATION TEMPERATURE (MPT) FOR HEAVY WALL REACTORS IN HYDROPROCESSING UNITS

机译：建立加氢装置中重型壁式反应器的最低压力温度（MPT）

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摘要

A procedure was developed to establish the minimum pressurization temperature (MPT) for Cr-Mo reactor vessels greater than 2-inches thick in high temperature hydrogen service. The procedure is consistent with a Level 2 assessment as defined in Part 3 of API RP-579 and accommodates the potential effects of temper embrittlement and hydrogen assisted fracture. Temper embrittlement effects can be accounted for by use of typical fracture data for Cr-Mo steels of similar vintage as used in the construction of the reactor vessel in question or by using data from actual reactor heat samples exposed in the reactor over time. The potential for hydrogen assisted fracture can be evaluated for specific vessel situations by estimating residual hydrogen levels in the vessel steel after shutdown. At very low levels of hydrogen (2 ppm and lower) hydrogen assisted fracture should not be a concern. An envelope for the reactor operating temperature and hydrogen partial pressure conditions is defined below which hydrogen assisted cracking should not be a concern. It should be noted that a more detailed Level 3 assessment as defined in Part 3 of API RP-579 can be performed to further refine the assessment if more material toughness data, flaw size information and/or stress information is available on the vessel. This procedure has been used within our company to safely start-up and shutdown heavy wall Cr-Mo vessels.
机译：开发了一种程序来确定在高温氢气服务下大于2英寸厚的Cr-Mo反应堆容器的最低加压温度（MPT）。该程序与API RP-579第3部分中定义的2级评估相一致，并且适应了回火脆化和氢辅助断裂的潜在影响。可以通过使用与所讨论的反应堆容器的构造中使用的相似寿命的Cr-Mo钢的典型断裂数据，或通过使用随时间推移暴露在反应堆中的实际反应堆热量样本的数据来考虑回火脆化的影响。可以通过估计停工后容器钢中的残留氢含量来评估特定容器情况下氢辅助断裂的可能性。在氢气含量极低（2 ppm和更低）的情况下，不需要考虑氢气辅助断裂。定义了反应器工作温度和氢分压条件的包络线，在该包络线以下不应考虑氢辅助裂化。应当注意，如果在容器上有更多的材料韧性数据，缺陷尺寸信息和/或应力信息可用，可以执行API RP-579第3部分中定义的更详细的3级评估，以进一步完善评估。我们公司已使用此程序安全地启动和关闭厚壁Cr-Mo容器。

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