In which position should pressure relief valves on pressure vessels be installed?

The correct position for pressure relief valves on pressure vessels is vertical installation. This orientation is crucial because it ensures that the valve operates effectively in relieving excess pressure from the vessel. When a pressure relief valve is installed vertically, it allows any potential debris or liquids to drain away from the valve seat, thus preventing blockages that could impede its operation.

Moreover, this vertical positioning encourages proper gravitational movement, ensuring that the valve opens reliably when needed to release pressure, preventing any risk of the vessel over-pressurizing. A vertically oriented relief valve also minimizes the chance of challenges related to orientation, such as misalignment or improper sealing, which could occur with other positions.

In contrast, while horizontal and angled installations might seem feasible, they can create complications concerning drainage and could lead to the potential entrapment of liquid, which can hinder the functional reliability of the valve. Additionally, installing the valve at any position (like horizontal or angled) could contravene regulatory standards or best practices designed to ensure safety and operational efficiency.