The effects of tempering weld-pass treatment on toughness of HAZ of X80 pipeline steel were studied by the technique of welding thermal simulation and the method of microscope analysis.
采用焊接热模拟技术和显微分析方法，研究了回火焊道热处理对X80级管线钢焊接热影响区韧性的影响规律。
Combine a body the pump and the valve, and through pump's by-pass governing, causes the return route pressure to drop to lowly, thus reduces the pipeline and divulging.
将泵和阀组合成一体，并通过泵的旁通控制，使回路压力降至最低，从而减少管路及其泄漏。
The protection against the water hammer is introduced in this paper as follows: changing the character of the pipeline network, protection of by-pass pipe and the air bottle.
介绍了几种常见的水击防护措施，如改变管网系统的特性、旁通管防护、空气罐防护等。
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