METHOD FOR INSPECTING SAFETY VALVE OPERATION AND SAFETY VALVE OPERATION INSPECTION DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a method for inspecting safety valve operation and a safety valve operation inspection device with which it is possible to detect start-to-discharge, blowout and flow-stop with high accuracy.SOLUTION: A safety valve 2 to be inspected is immersed in a transparent water tank 1 filled with a liquid 13. A camera 3 is installed right above the safety valve 2. An illumination 4, with its illumination range limited to the vicinity of an opening of the safety valve 2, is installed on a side of the safety valve 2. The pressure of air supplied to the safety value 2 is gradually raised. An image processing unit 5 analyzes the captured image of the camera 3, detects generation and extinction of air bubbles near the opening of the safety valve 2, and detects a time when air bubbles are detected first as start-to-discharge, a time when air bubbles are generated in succession in a given duration of time as blowout, and a time when air bubbles are no longer generated for a given duration of time after gas supply is stopped, as flow-stop. A pressure monitoring unit 10 detects supplied pressure with a pressure gauge 11, and recognizes the pressure at the time of start-to-discharge as start-to-discharge pressure, the pressure when blowout is detected as blowout pressure, and the pressure at the time of flow-stop as flow-stop pressure.SELECTED DRAWING: Figure 1