Pipelines of Complex Configuration. Calculation of the Pressure Loss in Pneumatic Transport with a Stagnated Dense Bed

Determining the pressure loss in pipelines is an important problem in using pneumatic transport. The problem is especially pressing for pneumatic transport with a stagnated dense bed (SDB) due to the high specific (per unit of length) pressure losses.     

西气东输三线0.8设计系数试验段水压试验测试

为了保证0.8设计系数油气长输管道的安全运行,对0.8设计系数试验段管道进行了高强度水压试验。结合埋地管道的应力状态,通过理论分析确定了管道试压强度为105% SMYS,在试验过程中利用压力－容积曲线监测试压过程中整个试验段管道变形情况,并利用应变电测法测得管道典型位置的应力应变情况。结果表明,0.8设计系数水压试验压力在（100%~105%）SMYS时,水压试验中管道未发生塑性变形,管道的等效应力均低于规定的最小屈服强度,且未泄漏,表明该水压试验压力分段合理,可以用于0.8设计系数管道的设计试压分段和管道现场水压施工。