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Anonymous users2024-01-24(1) The drainage flow of PVC pipe depends on the slope of the pipeline to achieve the effect of flow, (if it is transported by pump, it is not within the scope of description in this section) because the inner wall of PVC pipe is very smooth, and its roughness coefficient is cast iron, so the flow rate of PVC pipe under different inner diameters is much larger than that of metal pipes, and long-term use, the pipe will not adhere to scale, so the flow rate will not always have a low change, plus the excellent acid, alkali and corrosion resistance characteristics of PVC pipe, it is the most practical pipe for sewer engineering pipelines.
2) The flow rate of the PVC drain pipe can be calculated by the Manning formula = A*VV=1 nR2 3 * 1 2 of I
where: Q: flow rate (M's power of 3 sec).
A: Flowing water break area (M squared).
V: FLOW RATE (M SEC).
N: roughness coefficient.
R: DIAMETER DEPTH (M).
I: The slope of the run, expressed as a fraction or decimal
R=As (full or half-pipe, R=D 4).
S: The arc length (M) of the water part of the flowing water
Roughness coefficient: PVC pipe: cement pipe: cast iron pipe:
3) Sewer: the role of PVC piping into the hole.
A. Provide inspection and removal of sediment.
B. It is used for changing the direction and height of the sewer drainage pipeline (generating slope). According to the design habit, the sewer is in a straight line between the manholes, and the hole can also be used to fix the position and change the direction, due to the different terrain, depending on the slope or height of the change to use a variety of different height holes.
In the sewer line, the distance between the holes is about 90-120m, which varies depending on the site, design and sanitary engineering standards. 、
3) Head loss and flow rate of PVC pipe:
1) The friction head loss caused by the length of the straight pipe and the flow rate of the water in the water pipe can be calculated by the following Darcy-Wisbach formula.
H: 2g of the square of *e d*v
Where: H: loss head (M).
: coefficient of friction (M).
e:: The length of the piping.
d: Inner diameter of the tube.
V: Flow rate (m sec).
If this transformation is definitely to use a 45-degree elbow, because it is not to demolish the wall but to slot, it is in line with the specifications, which will not affect the quality of the main project of the house, but the water pipe connector must be sealed with glue to avoid water leakage.
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