What method should be used when replacing broken sight glass?

When replacing broken sight glass, the appropriate method involves removing the broken glass and installing a new sight glass with washers. This approach ensures that the new glass is securely fitted and properly sealed, which is crucial for maintaining the integrity of the system. The use of washers is important because they help create a leak-proof seal, preventing any potential leaks that could occur from the high pressure or temperature in the system.

Additionally, careful removal of any broken fragments is necessary to avoid contamination and ensure that the new sight glass can be installed correctly. Proper installation techniques minimize the risk of future breakage and ensure the safety and functionality of the equipment.

Other methods such as quickly opening connections may lead to unwanted pressure fluctuations or leaks, while closing all valves could disrupt system operation unnecessarily. Leaving the system unattended during repairs poses safety risks and could exacerbate any existing issues. Therefore, the method of removing the broken glass and installing a new one with washers is the most effective and safe approach.