[Case Study] Duct Insulation Repair - Shortening Construction Time through Thorough Preliminary Investigation!
Duct insulation repair - Shortening construction time through thorough pre-investigation!
At the paper mill, damage occurred to the insulation material of the exhaust duct due to the earthquake. An ISO audit and a factory tour for users are scheduled, and we have been consulted about urgently repairing it before then. Issues: 1. Due to the old equipment, there are no existing drawings or specifications, so measurements must be taken on-site and repairs must be made. 2. There are only about 10 days until the desired completion date for the construction. 3. It is necessary to finish the work in harmony with the surrounding lines.
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Based on previous construction experience, it was determined that there is a high possibility of damage to the internal ducts due to the earthquake, and therefore, a preliminary inspection was conducted not only for the repair of the insulation material on the outer skin but also for the repair and reinforcement of the duct itself. Since time was of the essence, on the same day the consultation was received, we secured the necessary materials for duct reinforcement in addition to the insulation material. Points: 1. Upon removing the severely damaged existing insulation material, it was found that the duct flange connection was completely separated (flange bolt damage). 2. Anticipating this in advance, we immediately fabricated the matching flange and reinforcement channel on-site (measured and produced). 3. The size of the existing flange connection bolts was too small and insufficient for load-bearing, so they were changed to appropriate bolts, and by tightening them together with the channel and matching flange, the strength of the connection was improved. 4. The existing structure consisted of the duct body + glass wool + aluminum glass cloth + decorative steel plate, but considering future maintenance and cost reduction, the decorative steel plate was omitted, and aluminum glass cloth with a decorative coating was used for the exterior to match the surrounding colors.
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