The first step: the internal leakage of the gate valve, the energy consumption is first "know". The energy consumption calculation done by the device every day is the same as that of yesterday. If the yield is reduced, in the process of eliminating the process and instrumentation, I will initially judge that there may be leakage of the gate valve, resulting in increased energy consumption.
The second step: the thermometer detects "indispensable". The gate valve leaks, and the adjacent subsequent pipelines are detected by the thermometer to detect a significant increase or decrease in temperature.
The third step: the stethoscope "follow up". We judged the inner leakage of the gate valve through the first step and the second step method, but it is still not fully confirmed. At this time, the "stethoscope" detection is very important. You can choose the screwdriver as the "stethoscope", the end of the screwdriver head is perpendicular to the pipeline, and the other end is close to your own ear. Listen carefully to whether there is a "sting" abnormal sound in the pipeline. If so, you can judge that the gate valve is leaking.
According to these three steps, it is basically possible to accurately determine whether the gate valve is leaking!
In addition: attach a temperature in the end how to identify the endoleak.
The method for determining the internal leakage of the valve is: after the valve is closed for 4-6 hours, the infrared temperature measuring instrument is used to measure the metal temperature of the valve stem (near the valve body) or 150 mm downstream of the valve body. If it is greater than 70 ° C, it is considered as "internal leakage". ". This method of judging is applicable to most internal leakage valves, but in actual work, we have encountered the following special cases: side-by-side access to the drain or drain door of the sparse and draining water pipes, when the last valve position is When approaching the main pipe, as long as any branch valve in the pipeline leaks inside, the temperature of other valves will rise to over 70 °C, such as boiler drain valve, superheated steam and so on. Therefore, the internal leakage of these valves must be determined in other ways. The front wall temperature or the front valve stem temperature is measured to determine the internal leakage.
Valve internal leakage judgment standard (temperature) medium temperature
Severe internal leakage of pipe wall temperature after trapping valve
>500°C
>250°C and the temperature difference from the front wall is less than 50°C
>200°C and the temperature difference from the front wall is less than 50°C
>150°C and the temperature difference from the front wall is less than 50°C
>120°C and the temperature difference from the front wall is less than 30°C
General endoleak
>200°C and the temperature difference from the front wall of the door is less than 80°C>150°C and the temperature difference from the front wall is less than 80°C>100°C and the temperature difference from the front wall is less than 80°C>80°C and the temperature difference from the front wall is less than 50 ° C
leakage
>200°C and the temperature difference from the front wall of the door is greater than 50°C>150°C and the temperature difference from the front wall is greater than 50°C>100°C and the temperature difference from the front wall is greater than 50°C>80°C and the temperature difference from the front wall is greater than 50 ° C
400°C-500°C
300°C-400°C
150°C-300°C
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