Expansion joints are required at what interval?

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Multiple Choice

Expansion joints are required at what interval?

Expansion joints are used to absorb the movement that happens in outdoor duct runs due to temperature changes and soil movement. In exterior plant installations, keeping the joints at regular, not-too-long intervals helps prevent stress from expansion and contraction from damaging the duct and connections. A common and practical spacing is about 100 feet (roughly 30 meters), which limits the amount of movement any single run must accommodate. If you go much longer than that, the stress on the duct and joints increases; if you go much shorter, you’re adding unnecessary joints and cost. So, the standard interval is 100 feet.

Expansion joints are used to absorb the movement that happens in outdoor duct runs due to temperature changes and soil movement. In exterior plant installations, keeping the joints at regular, not-too-long intervals helps prevent stress from expansion and contraction from damaging the duct and connections. A common and practical spacing is about 100 feet (roughly 30 meters), which limits the amount of movement any single run must accommodate. If you go much longer than that, the stress on the duct and joints increases; if you go much shorter, you’re adding unnecessary joints and cost. So, the standard interval is 100 feet.

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