For visual inspection, what should be kept open in refrigerant piping?

For visual inspection in refrigerant piping, joints should be kept open. This is critical because it allows for the inspection of the integrity and proper assembly of the piping system. Joints are potential points for leaks, and ensuring they are accessible for inspection can help identify any issues such as misalignment, deterioration, or improper sealing that could lead to refrigerant loss.

In refrigerant systems, the joints are the points where two different pipes or components come together, which makes them susceptible to leaks if not properly installed or maintained. Inspections of these joints help ensure that the refrigeration system operates efficiently and safely.

Other components like seams and connections should also be inspected, but keeping joints open specifically allows for a more thorough examination of these vulnerable areas. All fittings, while important, are not the primary focus during a visual inspection. The emphasis on joints ensures that inspectors can readily assess the condition of the most critical sections of the refrigerant piping system.