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A safety valve that is over 3 inches in size and operates at pressures greater than 15 psig is required to have a flanged or welded connection to ensure the proper securement and safety of the valve in high-pressure conditions.

Flanged connections allow for easier maintenance and removal of the valve since the bolts can be unscrewed, making it accessible without needing to disturb the pipework significantly. Similarly, welded connections provide a more permanent attachment, which is advantageous in high-pressure environments where the risk of leakage or failure is higher. Both types of connections are necessary for larger valves due to the stresses they endure during operation, ensuring they remain securely connected to the system while effectively relieving pressure as needed.

This requirement is dictated by safety regulations and engineering practices to prevent any potential hazards related to the failure of the valve or its connection.