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电热管设计负荷方法

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对设计规程的限制
Restrictions on design specification
3.2.1 许用应力仅基于屈服强度和断裂强度的考虑;弹性或蠕变应变不予考虑。使用这
3.2.1 allowable stress only yield strength and fracture strength based on the consideration of the elastic and creep strain disregarded. The use of this
些许用应力可能导致某些应用中的小永久应变;然而,这些小应变不会影响加热器管的安全性或操作性。
Some stress may lead to some applications of small permanent strain; however, affect safety or operation of heater tube these small strain will not.
3.2.2 未包括对不利环境影响的考虑,例如石墨化作用,渗碳作用,或者氢蚀作用。由氢
3.2.2 does not include the impact of unfavorable environmental considerations, such as graphitization, carburization, or hydrogen inhibition. By hydrogen
蚀强加的限制可从API RP941[15]中的纳尔逊曲线推导出来。
Inhibition imposed restrictions can be deduced from API RP941[15] in the Nelson curve.
3.2.3 这些设计规程是为无缝钢管的设计制定的。当将其用于具有纵向焊缝的管子时,
3.2.3 these design rules are formulated for the design of seamless steel pipe. When applied with longitudinal weld tube,
许用应力值应乘以适当的接缝效率系数。接缝效率系数不适用于环形焊缝管。 3.2.4 这些设计规程是为薄壁管(厚度与外径之比,min/Do,小于0.15的管子)制定的。
The allowable stress values should be joint efficiency coefficient is multiplied by the appropriate. Joint efficiency coefficient is not suitable for circular weld pipe. 3.2.4 these design rules for the thin-walled tube (thickness and diameter ratio, min/Do, less than 0.15 of the pipe).
对于较厚管子的设计附加一些考虑事项。 3.2.5 未包括对周期压力或周期热负荷效应的考虑。
For the design of thicker pipe additional considerations. 3.2.5 not included on periodic pressure or periodic heat load effect considered.
3.2.6 设计负荷包括的只是内部压力。热应力的极限在附录C中提供。对于由质量,支
Only the internal pressure 3.2.6 design loads include. The limit of the thermal stress is provided in Appendix C. For the quality, support
架,端部连接等引起的应力的极限,在该国际标准中未予讨论。
At the end of the connecting frame, stress caused by the limit, in this international standard are not.
3.2.7 第5.6条中的拉尔逊 – 米勒(Larson-Miller)参数曲线不是传统意义上的拉尔逊 –
3.2.7 in article 5.6 Lalson – Miller (Larson-Miller) parameter curve is not the traditional sense of the Lalson –
米勒曲线,而是像在H.3中阐述的那样,是从100 000 h断裂强度导出的。因此,该曲线不能对少于20 000 h或多于200 000 h的设计寿命的断裂强度提供可靠的估计。
Miller curve, but as described in H.3, from 100 000 derived h fracture strength. Therefore, the curve cannot strength of less than 20 h 000 or more than 200 design life of 000 h provides reliable estimates of fracture.

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