SEALING WASTEWATER APPLICATIONS
3 . Using flush water is a highly effective strategy for wastewater applications where leaks of the transported fluid cannot be tolerated . In this method , clean water is injected into the stuffing box at a pressure slightly higher than the abrasive fluid , typically 1 bar higher . This water acts as a barrier , preventing the abrasive material from coming into direct contact with some of the packing rings , thus extending its life , reducing the friction between packing and shaft , and reducing maintenance costs . This approach also guarantees that any fluid leaking will be clean water , not wastewater .
Example of graphite or carbon fiber packing , such as Teadit 2200C style packing .
While this strategy can effectively prevent hazardous leaks , there are two potential challenges to be aware of .
• The lantern ring may shift , potentially allowing a packing ring to obstruct the flush port , which can cause the flush to travel along the outer diameter of the stuffing box .
• Contaminated flush water can lead to the deterioration of the packing material . 1 Although ; typically , in these types of applications , the fluid
54 Valve World November 2024 www . valve-world . net