PVC-U Spiral Silencing Pipe and Fittings compared to cast iron pipelarger coefficient of linear expansion, about 0.07mm / m * ℃, the drain standpipe and a longersuspension cross pipe ends should set a fixed support , and strictly preventthe linear expansion accumulation in the piping system, expansion joints shallbe provided between the fixed support , or in lead pipe rupture or leakage, orlead pipes produce significant bending.
(2)Setuprequirements for expansion joints
A: Whenthe story is less than or equal to 4m , the riser pipe should be located oneach floor an expansion joint ; when the story is greater than 4m, should bedetermined according to the design amount of stretching.
B:horizontal main pipe set horizontal expansion joints shall be determinedaccording to the design amount of stretching
C:Horizontal branch pipe section from confluence fittings to the straight piperiser more than 2m , the expansion joints should be set , but the maximum distancebetween expansion joints shall not exceed 4m; two expansion joints should bebetween a fixed support , in order to control the direction of pipelineexpansion .
D: Pipingexpansion volume should not exceed the maximum allowable amount of stretching expansionjoints
OD(mm) | 50 | 75 | 110 | 160 |
Maximumexpansion amount allowed (mm) | 12 | 15 | 20 | 25 |
Setting expansion joints should be located close to the water at theconfluence of accessories, riser pipe expansion joints should be set close tothe branch office access , try to make the branch pipe connecting the riserdisplacements at a minimum , to ensure that the system is working properly.