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電熱管設計負荷方法

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對設計規程的限制
Restrictions on design specification
3.2.1 許用應力僅基于屈服強度和斷裂強度的考慮;彈性或蠕變應變不予考慮。使用這
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
些許用應力可能導致某些應用中的小永久應變;然而,這些小應變不會影響加熱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 未包括對不利環境影響的考慮,例如石墨化作用,滲碳作用,或者氫蝕作用。由氫
3.2.2 does not include the impact of unfavorable environmental considerations, such as graphitization, carburization, or hydrogen inhibition. By hydrogen
蝕強加的限制可從API RP941[15]中的納爾遜曲線推導出來。
Inhibition imposed restrictions can be deduced from API RP941[15] in the Nelson curve.
3.2.3 這些設計規程是為無縫鋼管的設計制定的。當將其用于具有縱向焊縫的管子時,
3.2.3 these design rules are formulated for the design of seamless steel pipe. When applied with longitudinal weld tube,
許用應力值應乘以適當的接縫效率系數。接縫效率系數不適用于環形焊縫管。 3.2.4 這些設計規程是為薄壁管(厚度與外徑之比,?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).
對于較厚管子的設計附加一些考慮事項。 3.2.5 未包括對周期壓力或周期熱負荷效應的考慮。
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 設計負荷包括的只是內部壓力。熱應力的極限在附錄C中提供。對于由質量,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,端部連接等引起的應力的極限,在該國際標準中未予討論。
At the end of the connecting frame, stress caused by the limit, in this international standard are not.
3.2.7 第5.6條中的拉爾遜 – 米勒(Larson-Miller)參數曲線不是傳統意義上的拉爾遜 –
3.2.7 in article 5.6 Lalson – Miller (Larson-Miller) parameter curve is not the traditional sense of the Lalson –
米勒曲線,而是像在H.3中闡述的那樣,是從100 000 h斷裂強度導出的。因此,該曲線不能對少于20 000 h或多于200 000 h的設計壽命的斷裂強度提供可靠的估計。
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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