Is FC or FO better for the nitrogen seal inlet?
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I’ve looked at the diagrams for several projects; the nitrogen outlet ports are all of type FO, which is no problem. However, for the inlet ports, some are of type FC while others are FO. I would appreciate it if an expert could help analyze which option is better. O(∩_∩)O Thank you
It is safer to use FC for nitrogen sealing in atmospheric pressure tanks, in order to prevent overpressure in the storage tank.
It depends on the situation; my personal understanding is that it’s used to prevent leaks in ordinary materials. This is generally FC. It shuts down in an accident condition; it’s better to allow a little leakage rather than let pressure build up. Some substances are extremely toxic, or they are flammable and explosive. Use FO. Because the more severe the accident conditions, the more necessary it is to keep nitrogen flowing to prevent it from leaking out. Even when the safety valve opens, the medium flows along the closed safety valve channel.
It seems a bit messy the way it’s written. .
What is being asked here is likely the sulfur-containing wastewater tank (the raw water tank for the wastewater stripping unit) and the amine solution storage tank or amine solution circulation tank used for desulfurization.
We are all FC, because in addition to the nitrogen sealing system, there are also vent valves and emergency relief valve measures.
My buddy really understands me. . . Are the nitrogen seals on your two tanks both FC?
What about your raw water degassing tanks? What do the nitrogen-sealed inlet and outlet look like respectively?
For nitrogen sealing, it is generally controlled in stages, with the inlet usually being FC
The main consideration is, in the event of a failure, whether opening the valve would cause greater harm to the equipment’s operation or keeping it closed; each situation needs to be analyzed on its own.
This is general, but there are some specific situations that cannot be analyzed based on one’s own capabilities. .