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Почему设备在启动过程中需要进行热紧?

2018-07-27View Original

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Почему设备在启动过程中需要进行热紧?
Reply #22018-07-27
При запуса установки,冷换设备的主题与附件通过法兰、螺栓连接并用垫片密封。由于它们之间的材料不同,在升温过程中,特别是在热油区域(超过220℃),各部分的膨胀不均匀导致法兰松弛、密封面压力下降。在高温下,材料的弹性模量下降、变形、机械强度降低,引起法兰局部应力过高、产生塑性变形和弹性消失。此时压力对材料的影响极大,或者使垫片沿着法兰面移动导致泄漏。热紧的目的是消除法兰的松弛,使密封面有足够的压力,保证静密封的效果。
Reply #32018-10-06
П恒温a2250度热紧非常重要。

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