Direct Discharge Pipe for Mobile Toilets

The specifications and key points of the direct discharge pipe for mobile toilets are as follows:

I. Sewage Pipe Specifications The most common specification for sewage pipes in mobile toilets is dn110mm (110 millimeters). This is the most mainstream and standard specification, suitable for the vast majority of mobile toilets and in line with the minimum standard size (dn110mm) for toilet sewage pipes specified in national regulations. If direct discharge to a septic tank is required, the sewage outlet can be enlarged to 250mm. For the sink drain, a size of 160mm is recommended. When the sink drains separately, a pipe of dn50mm (50 millimeters) is typically used.

II. Specification Selection for Different Scenarios

1. Single-room or low-frequency use scenarios (such as scenic spots and construction sites): A dn110mm pipe can meet the requirements and has a relatively low cost.
2. Multi-unit or high-frequency use scenarios (such as shopping malls and stations): It is recommended to use pipes ranging from dn110mm to dn150mm to handle large-volume drainage and reduce the risk of blockage.
3. Special types of mobile toilets: Waterless packing or foam-sealing toilets do not require large sewage pipes. Due to their different sewage discharge methods, they have smaller pipe sizes or may not even require sewage pipes.

III. Relevant Regulatory Requirements According to the Code for Construction and Acceptance of Building Drainage Engineering (GB 50268-2008) and related standards:

• The minimum diameters of toilet sewage pipes, urinal troughs (three or more), and public bath pool drain pipes should not be less than dn110mm.
• The diameter of floor drain branch pipes should be dn50 to dn75mm, and the diameter of sink drain branch pipes should be dn50mm.

IV. Practical Suggestions

1. Slope design: It is recommended that the slope of the sewage horizontal pipe be 1% to 2% (a drop of 1 to 2 centimeters per meter) to prevent blockage.
2. Maintenance cycle: For pipe-discharge public toilets, it is recommended to flush with high-pressure water every 20 days in winter and every 60 days in summer to avoid the accumulation of dirt.
3. Pipe material selection: Priority should be given to PVC-U pipes due to their corrosion resistance, light weight, and ease of installation.
4. Joint sealing: Joints must be sealed with glue or sealant to prevent water leakage and odor return.

Reasonable selection of pipe specifications and adherence to regulations can ensure the stability and hygiene of the drainage system in mobile toilets.