What does a level gauge, as a protective device to prevent leaks, refer to? ? How is it usually done?
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Level gauges are used on liquefied gas pressure vessels containing explosive and highly toxic, extremely hazardous substances, and are equipped with protection devices to prevent leaks. —TSG R0004 (P39) 8.5.1 (5) What does it mean by a level gauge being a protective device to prevent leaks? ? How is it usually done?
In fact, the indicating device of the level gauge is in indirect contact with the medium. For example: magnetic flap level gauge. There are such questions on the forum, and the answers are very good; you can take a look: https://bbs.hcbbs.com/thread-1384045-1-1.html
The drain port of the level gauge should be sealed, or valves and plugs should be installed to ensure airtightness
There is a type of fitting that shuts off when the flow rate increases due to leakage. Have you heard of it? Have you seen it?
A special valve that contains a small ball; when there is a leak, the fluid pushes this ball, which then closes the valve and thus stops the leakage.