Types of PRD systems Sample Clauses

Types of PRD systems. There is a variety of types and sizes of PRDs available owing to their diverse range of applications. The contents of the storage tanks may include compressed gases, corrosive liquids, two-phase fluids, and some of them such as liquid hydrogen can change phase upon venting. Thus, it is impossible to find a universal PRD that will fit all of these applications. There are two main categories of PRDs for pressurised storage vessels: reclosing and non-reclosing. A reclosing PRD is designed to close after its operation [3] and can be reused after their activation. Although this type of PRD can be attractive in applications where overpressures may occur occasionally, it is not suitable for storage tanks in hydrogen-powered vehicles due to the following reasons: it is only activated by pressure (not by temperature); it restricts the flow rate and does not allow a full release of storage content. The most common device is a spring-loaded PRD shown on Figure 2. A sealing occurs between the disk and the seating surface. The adjusting screw allows the spring tension to be varied, which adjusts the downward force on the disk and thus the relieving pressure. If outflow pressure in reclosing PRD increases upon activation, the disk can reseat and then reopen again, resulting in decreased venting rates and chatter that can damage the valve [2].
Sample 1
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