气动调节阀保位系统在原油管道上的应用

为了确保原油管道在设定的压力下安全运行,采用MOKVELD气动调节输油站场阀来自动调节输油站场管道进出站压力和管道压力波。原油管道输送工艺的特殊性要求调节阀出现故障时应处于保位状态。分析了现有调节阀控制原理和故障保位方案。由于调节阀配套的FISHER DVC6010电气定位器本身不具备故障保位功能,通过对调节阀进行增加电磁阀和信号保护模块的改造,实现了调节阀的故障保位功能。改造后的调节阀已成功应用于原油管道,确保了管道安全平稳运行。

Percutaneous placement of an IABP in the left axillary/subclavian position provides safe,ambulatory long-term support as bridge to heart transplantation

Objectives We evaluated the feasibility, tolerability, and efficacy of a strategy for percutaneous pump （IABP） placement through the left axillary-subelavian artery to provide mechanical in patients with end-stage heart failure as a bridge to heart transplantation. intra-aortic balloon circulatory support