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1. Vent pipe, H pipe
(1)Drainage stretch top riser should set breather pipe, the top should be set ventilation hair, when unconditional settings breather pipe, should set the fill valve .
(2)Stretch top up without master roof vent pipe ( including insulation ) shall not be less than 0.3m, and should be greater than the maximum thickness of the snow, it was in the regular activities of the roof, the roof vent pipe extending not less than 2m.
(3)Stretch top vent riser diameter is not less than the diameter of the drainage
(4)Ventilation and drainage standpipe riser should compartment connected, connection method should give priority to using H- pipe , H pipe and vent riser connection point should be higher than sanitary ware edge 150mm.
(5) Vent pipe design
A: Breather pipe minimum diameter shall be determined as the following table
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Breather pipe name |
Drain pipe diameter mm |
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40 |
50 |
75 |
110 |
160 |
200 |
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fixture vent |
40 |
40 |
-- |
50 |
-- |
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loop vent |
-- |
40 |
40 |
50 |
-- |
-- |
|
Vent Stack |
-- |
-- |
-- |
75 |
110 |
160 |
B: Vent length greater than 50m , its diameter should be the same as sewage risers
(6)When two and two more sewage risers simultaneously with a vent connected,the maximum one should be on the table at the riser effluent to determine ventilation riser pipe diameter, and its diameter should not be less than the rest stand any one sewage pipe diameter .
(7)H tube center distance dimensions: when diameter less than 110mm ,center distance is 180mm, when equal to 160mm diameter the center distance is 220mm, ZHENYUN produced the H pipe center distance adjustable range is: when the diameter is equal to 110 CM ,center distance is 150mm-180mm, when equal to 160mm center distance is 180mm-220mm
(8)Using H- pipe ventilation combined system, its top and bottom should be configured with H pipe tail pipe connected to waste water standpipe.
2.expansion joint
(1)The necessity of setting expansion joints
PVC-U Spiral Silencing Pipe and Fittings compared to cast iron pipe larger coefficient of linear expansion, about 0.07mm / m * ℃, the drain standpipe and a longer suspension cross pipe ends should set a fixed support , and strictly prevent the linear expansion accumulation in the piping system, expansion joints shall be provided between the fixed support , or in lead pipe rupture or leakage, or lead pipes produce significant bending.
(2)Setup requirements for expansion joints
A: When the story is less than or equal to 4m , the riser pipe should be located on each floor an expansion joint ; when the story is greater than 4m, should be determined according to the design amount of stretching.
B: horizontal main pipe set horizontal expansion joints shall be determined according to the design amount of stretching
C: Horizontal branch pipe section from confluence fittings to the straight pipe riser more than 2m , the expansion joints should be set , but the maximum distance between expansion joints shall not exceed 4m; two expansion joints should be between a fixed support , in order to control the direction of pipeline expansion .
D: Piping expansion volume should not exceed the maximum allowable amount of stretching expansion joints
|
OD（mm） |
50 |
75 |
110 |
160 |
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Maximumexpansion amount allowed (mm) |
12 |
15 |
20 |
25 |
Setting expansion joints should be located close to the water at the confluence of accessories, riser pipe expansion joints should be set close to the branch office access , try to make the branch pipe connecting the riser displacements at a minimum , to ensure that the system is working properly.
