Installation of PVC drain pipe card: spacing, material and fixing method

The PVC drain pipe is the "blood vessel" of the family decoration and engineering drainage system, and the pipe card is the "seat belt" to protect the stability of this "blood vessel" - many people think that the pipe card is a "small part", but once the installation is not standardized, the pipe will sag and deform, and the interface will loosen and leak, which will lay a big hidden danger for later life. Today, let's explain the 3 core issues of pipe card installation: how to calculate the spacing, how to choose the material, and how to fix it.

First talk about the most critical spacing requirements - the spacing of the pipe card is not "based on feeling", but has to follow the pipe diameter. There is a general specification in the industry: DN50 (outer diameter of about 63mm) PVC pipe, pipe card spacing does not exceed 1.2 meters; DN75 (outer diameter of about 90mm) does not exceed 1.5 meters; DN110 (outer diameter of about 110mm) does not exceed 2 meters; DN160 (outer diameter of about 160mm) does not exceed 2.5 meters. If the pipe goes in the vertical direction (such as riser), the spacing should be shortened by another 20% - such as DN110 riser, pipe card up to 1.6 meters each. In addition, the connection of pipe fittings is a "high-risk area": no matter how large the pipe diameter is, a pipe card must be installed within 30-50cm before and after the turning, tee, and four-way parts, otherwise the pipe fittings will be easily pulled off by force.

Let's talk about the material selection - choose the right material in different scenarios, and the pipe card can be "durable and not overturned". There are currently three common pipe card materials: PVC, galvanized steel, and stainless steel. PVC pipe cards are the cheapest, and the same material as pipes will not "react", but they are afraid of sun exposure - long-term outdoor exposure will cause brittle cracking, suitable for indoor concealment (such as in ceilings); galvanized steel pipe cards have high hardness, impact resistance, but are prone to rust. If installed in a humid environment such as a bathroom, the screws may rust to death after a few years, suitable for balconies or non-corrosive areas; stainless steel pipe cards are the most expensive, but have the best corrosion resistance. Outdoor open-air pipes or chemical plants are corrosive environments. It is correct to choose it.

Finally, the fixing method - different positions have different "fixing routines". Wall fixing is the most common: first draw a mark on the wall according to the spacing, use an electric drill to make a hole 5mm deeper than the expansion pipe (for example, the expansion pipe is 30mm long, and the hole is 35mm), plug the expansion pipe in, fix the pipe with screws, and then card the pipe into the card slot - remember not to screw it too tightly! Leave room for the thermal expansion and contraction of the PVC pipe, otherwise the pipe will be squeezed and deformed in summer. For ground fixing (such as buried pipes), use "pipe card supports": first dig trenches in the ground to level, put the supports in the trenches, and then put the pipes on the supports, and fix them with buckles to prevent the pipes from sinking. The pipes in the ceiling should be installed with "elevators": use expansion screws to fix the tendons on the top surface, then hang the elevators on the tendons, and adjust the height to make the pipes level - the spacing of the elevators should be 10% denser than that of the wall pipe cards, because the pipes in the ceiling have no wall support and must be more stable.

In fact, the logic of pipe card installation is very simple: make the pipes "evenly stressed" - the spacing is dense enough so that they will not sag, the material matches so that they will not age and corrode, and if they are properly fixed, they will not be loosened by external forces. Many people try to save trouble when installing pipe cards. "Pack a few less" and "choose any material". As a result, it took two or three years for the pipes to sag, the interfaces cracked and leaked, and they only regretted it when they Remember: although the pipe card is small, it is the "invisible guardian" of the drainage system. Only by understanding these three problems can the PVC pipe be used safely for decades.