To charge a pressure vessel, you must first disconnect it from the system to avoid inaccurate pressure readings, then test the air pressure using a pressure gauge.
Here's a more detailed explanation:
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Disconnect the Vessel: Physically disconnect the pressure vessel (specifically, an expansion vessel in this case) from the rest of the plumbing or system it's connected to. This is essential because the pressure in the system will affect the reading you get on the vessel itself.
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Test the Air Pressure: Use a pressure gauge (like one you'd use to check tire pressure) to determine the existing air pressure inside the vessel. This will inform you of how much, if any, air needs to be added. The appropriate pressure varies depending on the system.
While the provided context focuses on expansion vessels, the basic principle applies to other pressure vessels that require pre-charging or maintaining a specific pressure level. The type of gas used for charging depends on the vessel's application and the materials it's designed to contain.
