| 摘要 |
<p>PURPOSE:To enable the application of a freezing,method to carbon steel piping and obtain the freezing method of high safety and reliability by executing the carbon steel piping freezing method after the confirmation of a crack being smaller than the previously computed allowed limit crack measure. CONSTITUTION:A carbon steel piping freezing method is divided into two stages: design and construction. The design stage is formed of three steps: the determination of a freezing method executed place (a), the computation of stress generated during the execution of the method (b) and the computation of allowed limit crack measure during the execution of the freezing method (c). The construction stage is formed of three steps: the measure inspection of a crack existing in the method executed place (d) which is to be performed before the execution of the freezing method, the confirmation of the existing crack measure being less than the allowed limit crack measure (e) and the execution of the freezing method (f). This enables the execution of the freezing method of high safety and reliability on carbon steel piping.</p> |
