Teach you how to find the right PVC pipe size for you? A must-read guide

1.PVC pipe parameter analysis: Only by understanding the specifications can you choose the right pipe

To understand the basic knowledge of PVC size, you must know the names of all the elements that make up the PVC pipe:

Nominal diameter (DN): represents the standard size identification of the pipe, such as DN20 (20mm)

Outer diameter (OD/Φ): the outer diameter of the pipe, which determines the matching of the installation interface

Wall thickness (ID): directly affects the pressure bearing capacity and durability of the pipe

PVC pipes of different specifications are suitable for different scenarios. For example, small diameter pipes (such as DN20-DN32) are often used for household wire conduits; medium diameter pipes (DN40-DN110) are suitable for household drainage; large diameter pipes (DN110 and above) are mainly used for municipal sewage or industrial purposes.

2. Fatal misunderstandings: Don’t make these mistakes

Wrong use of PVC to transport hot water: water temperature > 45℃ will cause toxic substances to precipitate and the pipe body to soften

Thin-walled pipe concealed installation: pipes with insufficient wall thickness are easily fractured by cement after being buried in the wall

Outdoor direct burial without protection: exposed PVC pipes have poor UV resistance and need to be covered with protective sleeves

Mixing different materials: PVC and metal pipes require special joints to avoid thermal expansion and contraction leakage

3、FAQ

Q1: Does the "Φ20mm" on PVC pipes refer to the inner diameter or the outer diameter?

A: Φ represents the outer diameter. The actual inner diameter needs to be subtracted by 2 times the wall thickness (such as Φ20×2.0mm pipe, inner diameter ≈16mm).

Q2: Can PVC pipes be buried directly underground?

A: It can be buried but must meet the following conditions: ① Use special buried pipes (such as corrugated pipes) ② No heavy pressure area ③ Use sand cushion layer protection

Q3: How to convert and connect PVC pipes and KBG metal pipes?

A: Metal-plastic transition joints (with threaded sealing rings inside) are required. Direct gluing is prohibited.

Jianlong Plastic is a plastic pipe supplier. 32 Years Specializing in Customized Processing of Plastic Pipes and Fittings. Provides pipe solutions for home water supply, drainage and various projects: such as agricultural irrigation, road engineering, mines, etc.!