Grout Bags, Inflatable Tunnel Seals
Petersen manufactures most size heavy duty inflatable bags for sealing off large mine shafts, drifts, tunnels, and canals for emergency, abandonment or maintenance. The small deflated size makes them ideal for installation through confined spaces. These inflatable items are made for a specific project to meet pressure, temperature, and chemical requirements.
They are generally inflated with air, inert gas, water or concrete. The 22 foot diameter Grout Bag shown was first filled with water and then the water displaced with concrete to permanently seal off a section of a flooded mine. It has a Kevlar outer cover to help prevent puncture.