The combination exhaust relief valve is set to lift at what range?

The correct answer is based on the standard operational parameters for a combination exhaust relief valve in a marine setting. This valve is designed to lift and relieve pressure at a point that provides safety for both the system and its associated components. Specifically, the relief valve is set to lift at a range of 2-3 psi above the exhaust line pressure to prevent excessive pressure build-up, which could lead to potential damage or failure of the exhaust system.

Setting the valve to this range ensures that the system can function safely under varying operational conditions while still allowing for effective pressure management. It provides a balance between preventing pressure-induced failures and maintaining system efficiency. A lower or higher lift pressure could compromise either the safety or functionality of the exhaust system, which is why the 2-3 psi threshold is typically established as a best practice.