What is the maximum pressure tolerance for joints in a refrigeration system located in an air duct?

The correct maximum pressure tolerance for joints in a refrigeration system located in an air duct is 150 percent of the design pressure. This standard is set to ensure the integrity and safety of the refrigeration system while allowing a reasonable margin for pressure fluctuations that can occur during operation.

In any mechanical system, joints are critical points where potential failures can occur if they are not rated for appropriate pressures. If the joints are rated at 150 percent of the design pressure, this provides a buffer against unexpected pressure increases that might occur during the operation of the refrigeration system.

Understanding the significance of this percentage is essential for proper system design and ensuring compliance with safety standards. Systems operating above their rated tolerances can lead to catastrophic failures, leaks, or other serious issues, which is why adherence to this limit is crucial for maintaining reliable and safe operations in these systems.

The other options provided do not align with these safety guidelines and tolerances in standard practices, which is why they are not the correct choice in this context.