What is an internal emergency shut-off valve? Is there a diagram? What is the principle?
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What is an internal emergency shut-off valve? Is there a diagram? What is the principle?
What are the requirements regarding the material and control of the emergency shut-off valve inside the tank, and how is it maintained? Are there corresponding specifications?
These are all unclear; since it’s inside a tank, the required reliability is probably higher
This post was last edited by GeniusTTUV on 2022-7-4 18:01: 11111111
Thank you for the information provided; thumbs up! Has it already become a requirement in the country?
There are no requirements for domestic projects; for foreign projects, it depends on the client’s needs, and valve installations inside tanks are rarely done.
According to the standards provided above, the storage tanks for several large-scale LNG projects currently under construction may
This is the first time I’ve heard of a cut-off valve inside a tank; it was informative. But personally, I wonder how inspection and maintenance can be carried out when using it?
Emergency shut-off valves inside the tank are generally not required on storage tanks. Currently, large fully refrigerated storage tanks are equipped with such systems; generally, there are two sets of quick shut-off valves. One set is installed on the inlet and outlet pipelines inside the tank, that is, the emergency shut-off valves located within the tank, while the other set is installed on the inlet and outlet pipelines outside the tank, and both can serve to perform emergency shutdown functions. The significance of an internal cut-off valve lies in the fact that, for fully frozen storage tanks, the joints where the outer tank is welded to the inlet and outlet pipelines, as well as the pipelines connecting the outer tank to the external cut-off valves, represent weak points with high stress levels. In the event of a leak at these locations, the external cut-off valves are unable to function; it is then necessary to use the internal cut-off valve to achieve isolation. The types of cut-off valves inside the tank include the weight-type; I am not very familiar with other types.