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Mechanical expansion joints shall be accessible and may be used where necessary to provide for expansion and contraction of the pipes. For hot water piping, the expansion function shall be provided by the flexing of the piping material with expansion loops or swing joints. The piping shall be properly anchored and installed as follows:
1. Each hot water riser shall be provided with anchors at a maximum distance of 100 feet (30.5 m) or less with an expansion loop of required length provided between such anchors.
2. Each hot water main shall be provided with anchors at a maximum distance of 100 feet (30.5 m) or less with an expansion loop of required length provided between such anchors. Offsets of 90 degrees in a horizontal main shall be of required length to absorb expansion by flexure.
3. Branches from mains connected to risers shall be provided with a swing joint of required length unless the branch is of adequate length to absorb expansion by flexure.
4. Branches from risers to fixtures shall be provided with a swing joint of required length unless the branch is of adequate length to absorb expansion by flexture.