For cases where infrared scans indicate that online repairs are recommended, some insulation materials can be applied from the outside.
With traditional repairs, the furnace must be shut down and cooled until it is safe for maintenance personnel to enter and repair the lining with fiber blankets, pumpables or monolithics. But, some materials allow online repair. For instance, some liquid materials can be pumped from the outside of the furnace or boiler, filling cracks and voids caused by deteriorated insulation. These products can help improve thermal insulation efficiencies behind boiler tubes in sidewalls, seals and floors. They also are suitable for repairs of ovens, furnaces and process equipment.