PVC drain pipe national standard wall thickness requirements: minimum wall thickness standards of different specifications

In the building drainage system, PVC drainage pipes have become the "main drainage force" for residential and commercial buildings due to their lightweight, corrosion resistance and convenient installation. The wall thickness of the pipe is the core indicator that determines its compression resistance, impact resistance and service life - only the minimum wall thickness in line with national standards can ensure that the drainage system will not break or leak due to excessive pressure and load during long-term use.

To understand the wall thickness requirements of PVC drainage pipes, it is first necessary to clarify its execution standards: At present, the production and inspection of PVC drainage pipes in China are mainly based on "Hard Polyvinyl Chloride (PVC-U) Pipes for Buildings" (GB/T 5836.1-2006). According to this standard, different specifications (represented by the nominal outer diameter De) of PVC drainage pipes correspond to different minimum wall thickness requirements, as follows:

1. De50 (nominal outer diameter 50mm): As a commonly used small-size pipe for indoor drainage, its minimum wall thickness requirement is 2.0mm. This type of pipe is usually used in small-flow drainage scenarios such as bathroom sinks and balcony floor drains. Although the pipe diameter is small, it has enough wall thickness to cope with daily water flow impacts.

2. De75 (nominal outer diameter 75mm): It is often used for medium-flow drainage such as kitchen sink, bathroom shower area, etc. The minimum wall thickness requirement is 2.3mm. Compared with De50, after the pipe diameter is increased, the pipe needs to withstand greater water weight and pipe pressure, so the wall thickness is slightly increased.

3. De110 (nominal outer diameter 110mm): This is the "main specification" of indoor drainage. It is widely used in toilet drainage, main drain pipe and other scenarios. The minimum wall thickness requirement is 3.2mm. Due to the large instantaneous flow of toilet drainage and obvious pressure fluctuations in the pipeline, thicker walls can ensure that the pipe is not deformed or broken.

4. De160 (nominal outer diameter 160mm): It is mostly used as the main drainage riser between floors or the drainage supervisor of commercial buildings. The minimum wall thickness requirement is 4.0mm. This type of pipe needs to withstand the drainage load of the whole layer or even multiple layers. The increase in wall thickness directly improves its resistance to external pressure.

5. De200 (nominal outer diameter 200mm): It is mainly used for the main drain pipe of outdoor drainage pipe network and large commercial buildings in residential areas. The minimum wall thickness requirement is 5.0mm. Outdoor pipe networks not only have to withstand internal water flow pressure, but also deal with soil extrusion, ground loads (such as vehicle rolling), so the thickest wall thickness is required to ensure strength.

Why are the wall thicknesses of different specifications of PVC drain pipes so different? In fact, the principle is very simple: the larger the pipe diameter, the higher the pipe's "ring stiffness" (ability to resist external pressure) requirements. When the pipe diameter increases, the ring stiffness under the same wall thickness will decrease, so it must be compensated by increasing the wall thickness to ensure that the pipe can withstand its own weight, water flow pressure and the load of the external environment.

In actual purchase or use, how to judge whether the PVC drain pipe meets the wall thickness requirements of the national standard? The most direct way is to measure the wall thickness of the pipe with a caliper - pay attention to measure the uniform circumference of the pipe to avoid local thinness caused by production errors. In addition, the pipes of regular manufacturers will be printed on the surface with specifications, wall thickness, execution standards and other information. When purchasing, you need to pay attention to whether these signs are clear and complete.

It should be reminded that some informal manufacturers will produce non-standard pipes that "reduce wall thickness" in order to reduce costs. Such pipes seem cheap, but they are prone to rupture due to excessive pressure during use, which will not only lead to problems such as water leakage and bubble walls, but also may cause neighborhood disputes or property damage. Therefore, whether used for home improvement or engineering, PVC drainage pipes that meet the GB/T 5836.1-2006 standards should be selected to ensure that the wall thickness meets the minimum requirements.

In short, the national standard wall thickness requirements of PVC drainage pipes are a summary of years of practice and technical specifications. The minimum wall thickness corresponding to each specification is a "safety line" to ensure the stable operation of the drainage system. Understanding these standards can not only help us avoid misunderstandings when selecting models, but also "escort" the long-term reliability of building drainage.