When should the lead or fiber washer be changed when installing the regulator to a chlorine cylinder?

The lead or fiber washer should be changed every time you change the cylinder for several important reasons related to safety and equipment integrity. When a chlorine cylinder is replaced, the washer can become compressed or deteriorated from the pressure and the corrosive nature of chlorine gas. Not replacing the washer can lead to leaks, which pose significant risks given the hazardous nature of chlorine. Ensuring a fresh washer is used with each new cylinder helps maintain a proper seal, thereby enhancing safety and preventing potential health hazards from exposure to chlorine gas. Regularly replacing the washer in conjunction with every cylinder change is a best practice in ensuring effective and safe operation in environments that handle chlorine.

In contrast, changing it weekly or monthly does not align with operational practices, as that frequency may not be necessary or practical unless specified by manufacturer guidelines. Only replacing the washer when it shows visible wear could lead to dangerous situations if the washer fails unexpectedly. Therefore, the most prudent and safe approach is to change the lead or fiber washer with every cylinder change.