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BRITTLE FRACTURE OF THIN WALL PRESSURE EQUIPMENT

机译:薄壁压力设备的脆性断裂

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摘要

Even for ferritic materials, it has been assumed that no consideration for the brittle fracture at low temperature is necessary on condition that the wall thickness of pressure equipment is less than roughly half an inch (12.7mm) from industrial experience. Nevertheless, brittle fracture incident occurred at a welded joint of a carbon steel pipeline used for transportation of crude oil at low temperature of -6℃ in one of our refineries recently. The pipeline was 12.0 mm in thickness and it was found that significant crack-like flaw existed along inside of the welded joint. In this study, the assessment of the brittle fracture of thin wall welded joint with crack-like flaw was performed in accordance with Section 9 in API RP 579 (2000). Then it was concluded that brittle fracture assessment is necessary regardless of the wall thickness when significant crack-like-flaw is detected in pressure equipment, especially at low temperature condition.
机译:即使对于铁素体材料,也假设在压力设备的壁厚小于工业经验约半英寸(12.7mm)的情况下,也无需考虑低温下的脆性断裂。然而,最近在我们的一家炼油厂中,在-6℃低温下用于运输原油的碳钢管道的焊接接头处发生了脆性断裂事件。管道的厚度为12.0mm,并且发现在焊接接头的内部存在明显的裂纹状缺陷。在这项研究中,根据API RP 579(2000)中的第9节对具有裂纹状缺陷的薄壁焊接接头的脆性断裂进行了评估。然后得出结论,在压力设备中,尤其是在低温条件下,当检测到明显的裂纹状缺陷时,无论壁厚如何,都必须进行脆性断裂评估。

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