Sewer pipe layout?

Standards of the People’s Republic of China – Code for Design of Outdoor Drainage Systems, GB 50014–2006: 4. Pipes and Drainage Structures; 4.3 Pipes. 4.3.1 For the connection of pipes of different diameters within inspection wells, it is advisable to use a horizontal connection at the top of the pipes or at the water level. 4.3.2 At pipe bends and joints, the angle of water flow should be no less than 90°. Note: When the pipe diameter is 300 mm or less and the head loss is greater than 0.3 m, this restriction does not apply. 4.3.3 The pipeline foundation shall be determined based on the pipeline material, joint type, and geological conditions; reinforcement measures shall be taken for the pipeline foundation in areas with soft soil or uneven settlement. 4.3.4 Pipe joints should be determined based on the pipe material and geological conditions; rigid or flexible joints can be used, with flexible joints being preferred for sewage and combined sewer pipes. When the pipeline passes through silt or fine sand layers and is below the highest groundwater level, or in areas with a seismic design intensity of 8 degrees, flexible joints should be used. 4.3.5 When designing drainage pipes, it is necessary to prevent backflow in the service pipes under pressure flow conditions. 4.3.6 Sewer pipes and combined sewer pipes shall be equipped with ventilation facilities as required. 4.3.7 The minimum cover depth above the pipe top shall be determined based on factors such as the strength of the pipe material, external loads, the depth of soil freezing, and soil properties, in conjunction with local experience in pipe burial. The minimum cover depth above the pipe should be: 0.6 m under sidewalks, and 0.7 m under vehicle roads. 4.3.8 Under normal circumstances, drainage pipes should be buried below the freezing line. When there is experience with shallow burial in that area or in areas with similar conditions, or when appropriate measures are taken, it is also possible to bury it above the freezing line. The value for shallow burial should be determined based on the experience of that area, but it is necessary to ensure the safe operation of the drainage pipes. 4.3.9 On urban arterial roads with a road red line width of over 50m, drainage pipes should be installed on both sides of the road. 4.3.10 When designing pressure pipelines, the effect of water hammer should be taken into account. Venting devices should be installed at the highest points of the pipeline and at regular intervals ； Drainage devices should be installed at the lowest point of the pipeline and at regular intervals. 4.3.11 For socket-type pressure pipelines, it shall be determined through calculation whether supports should be installed at vertical or horizontal bends, taking into account factors such as pipe diameter, flow velocity, bend angle, pressure testing standards, and interface friction. 4.3.12 When pressure pipes are connected to gravity-fed pipelines, energy dissipation devices shall be provided. 4.3.13 The construction method for pipelines should be determined through technical and economic comparison, taking into account factors such as the properties of the soil layer in which the pipeline is located, the pipe diameter, the groundwater level, and any nearby underground or above-ground structures; options such as trenching, jacking, or shield construction may be employed. 4.12 Canals 4.12.1 In areas with flat terrain, or where the burial depth or the depth of the outlet is limited, canals (open channels or covered channels) can be used to drain rainwater. The cover channel should use locally available materials, its structure should facilitate maintenance, and its walls can be constructed together with the road curbs. 4.12.2 The bottom width of open channels and covered channels should not be less than 0.3 m. For the slopes of open channels without paving, values shall be selected in accordance with Table 4.12.2 based on different geological conditions ； Open channels paved with bricks, stones, or concrete blocks can use a slope ratio of 1:0.75 to 1:1.

Act in accordance with regulations and do not violate laws and regulations. There are no special restrictions.

The environmental protection agency is gradually prohibiting chemical companies from laying their wastewater pipes underground. There should still be no **standards or regulations.

Passing by, learn*! ! ! ! ! !

Wastewater pipes can be laid using trusses; they cannot be laid using pipe racks. They cannot be laid on the ground, nor in open ditches. Laying them in ducts or underground is not recommended, as it makes it difficult to detect and repair leaks, and leaks can contaminate groundwater.