MP Foambag allows rapid emergency response shutdown of natural gas cast iron and steel mains and services at distribution pressures, when the area system valves are either unavailable, inoperable or the sector is too extensive for a full area shutdown.

Shutdowns are 100% and the main can be sectioned within 30 minutes of foam injection.

The system is also used for planned maintenance and mains or service abandonment projects, where an old main is being replaced with an upgraded PE system.

All of the work is completed under gas free conditions when used in conjunction with System-One tapping equipment

• MP fabric foambags are launched using ALH System-One Tapping equipment and a special foam bag launch canopy that also provides structural support in the main for the shutdown.
• Sealant is injected into the foambags via a pneumatic or hydraulically activated injection gun.
• Once the foam swells to fill the foambag, a limited amount oozes out through the special semi-porous surfaces to roll any fluids, including water, out of the way. It then combines with any liquid or loose debris and bonds to the pipe walls.
• This system provides the fastest and safest shutdown so that the main can be cut and sectioned within 30 minutes of foam injection
• By using multiple equipment sets, the system will provide rapid multi-way shutdown capabilities.
• Two bags are deployed in each position using a standard "double block and bleed" procedure ensuring the full shutdown.

The system can be used with another removable MP shutdown technique, such as ALH Iris Stop for a planned section-by-section mains replacement program.

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