Should the valve between the liquefied gas tank and the dehydration pack be normally open or normally closed in winter?
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Should the dehydration valve, which connects the liquefied gas sphere tank to the dehydration unit, be kept open or closed in winter? Liquefied gas is stored in the normally open dehydration bag ； It remains closed most of the time; as long as there is water, it will first accumulate at this valve. In the event of freezing, it can easily lead to pipeline cracks ； Dear fellow students, please give me some advice! Thank you!
Under normal conditions, the valve between the large tank and the water cutting tank is closed; it is only opened during water cutting and closed promptly after that. But generally, in many places, this valve is left open most of the time to save trouble; as long as the valve functions properly and is far enough away from the water storage tank so that it can be closed promptly in case of a leak, it’s acceptable. In winter, steam tracing or electric tracing should generally be used in northern regions. If there is no heat tracing system, it’s not safe either for water to enter the cutwater tank.
As mentioned above, installing electric heating is a practical solution; we also added electric heating to a project in Nanjing.
Under normal conditions, the valve between the large tank and the water cutting tank is closed; it is only opened during water cutting and closed promptly after that. But generally, in many places, this valve is left open most of the time to save trouble; as long as the valve functions properly and is far enough away from the water storage tank so that it can be closed promptly in case of a leak, it’s acceptable
It’s usually kept closed; there are generally no major issues with heat retention in dehydration packs
Normally closed, with heating provided
Normally closed, with heating provided
Electric heating is used, and it is turned off normally.
For safety reasons, it should be kept closed at all times; insulation along with heat tracing or steam tracing should be used.
It seems that those upstairs didn’t fully understand the asker’s question, so everyone answered that the valve was closed. In fact, what the original poster is asking about is the valve between the spherical tank and the dehydration bag, not the valve between the spherical tank and the dehydration tank. The spherical tank and the dehydration bag are quite close to each other, with a distance of roughly 2–3 meters. In my opinion, the function of this valve is to allow water from within the spherical tank to flow naturally into the dehydration bag. Therefore, this valve should remain fully open. Once the water level in the dehydration bag reaches a certain level, then the valve between the dehydration bag and the dehydration tank (flash tank) can be opened, so that the water in the dehydration bag can be pushed into the flash tank. During this process, it is necessary to close the valve between the spherical tank and the dehydration bag. There is heat tracing from below the spherical tank to the dehydration package and all the way to the flash tank, so freezing is prevented. If the valve connecting the tank to the dehydration unit is closed, the water inside the tank accumulates at the bottom of it. Since the tank does not have any heating system, the water freezes at the bottom of the tank. This can cause the gasket of the tank valve to be damaged by freezing, thereby **increasing the risk of leakage**. When thawing occurs in spring, this can lead to the leakage of liquefied gas. This is just my humble opinion; I welcome everyone’s criticism and suggestions.