HDPEAn expansion joint is installed in the drainage riser or lateral pipe of the siphon rainwater drainage system and the same-level drainage system to prevent unnecessary damage to the drainage pipes caused by thermal expansion and contraction. Its connection method: one end is inserted into the socket (which contains a rubber ring), and the other end is thermally fused.

. When the height exceeds2.2m but not exceeding 4m, a flexible joint should be installed on each level; the crossing point should have a fixed support. When the room height is greater than 4m, the number of flexible joints should be determined based on the expansion amount calculated from the pipeline design and the allowable expansion of the joints. The maximum spacing between vertical pipe flexible joints should not exceed 4m.
.When a transverse pipe is connected, the expansion joint should be positioned close to the convergence of the water flow.FittingsConvergeFittingsBelow the floor, an expansion joint should be installed below the convergence area; convergencePipe fittingsAt ground level, an expansion joint should be installed above the manifold fitting.
.When no transverse pipe is connected, it is advisable to be elevated from the ground.1.0 to 1.2m with expansion joints.

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