Hebei Ruijie Pipe Industry Co., Ltd. is one of the most reliable manufacturers and suppliers of pvc drainage pipes in China. With abundant experience, we warmly welcome you to buy high quality pvc drainage pipes for sale here from our factory. Also, pricelist and free sample are available.
PVC drainage pipes are extruded from PVC resin specifically for building drainage systems; it features a white finish (custom colors available). It is compatible with a full range of fittings-such as tees, elbows, expansion joints, and cleanouts-and utilizes socket-style connections for easy installation. The smooth inner wall resists buildup and fouling; the material is corrosion-resistant and rust-proof. Widely used in indoor and outdoor drainage, sewage, and rainwater systems for residential buildings, offices, and shopping malls, it is the standard choice for building drainage projects.
How to Assess Pipe Quality
Check the appearance: High-quality pipes have a smooth, flat surface free of bubbles, cracks, or dents; the color is a uniform white, not grayish or yellowish.
Check wall thickness: For the same specification, a uniform and sufficient wall thickness is ideal; use a caliper to measure-avoid "thin-skinned" pipes that lack adequate thickness.
Check the weight: For the same specification and length, a heavier pipe indicates sufficient material, whereas a pipe that is too light may contain excessive filler material.
Drop test: High-quality pipes have good toughness; they won't crack when dropped from a height of over one meter, whereas brittle, low-quality pipes will shatter upon impact. (Exercise caution when using this method in low-temperature environments.)
Smell the pipe: A strong, pungent odor after heating indicates poor-quality raw materials; high-quality pipes have a mild odor.
How to Choose Specifications
| Specifications (mm) | Suitable Venues |
| DN50 | Connects to low-flow points like washbasins, kitchen sinks, and floor drains; commonly used for branch lines in kitchens and bathrooms. |
| DN75 | Connects to washing machines and urinals, or serves as a horizontal pipe collecting flow from several small branch lines. |
| DN110 | Toilet drainage pipes, bathroom main vertical stacks, and balcony rainwater pipes; the most common specification. |
| DN160 | Building-wide vertical drainage stacks and main horizontal discharge pipes; used for large residential units or commercial buildings. |
| DN200 and above | Outdoor drainage networks for residential complexes and main drainage pipes for large buildings. |
Common pitfalls during installation
Insufficient slope: Horizontal pipes must have a slope-at least 2.5% (25 per thousand) for 50mm pipes and 1.2% (12 per thousand) for 110mm pipes; a lack of slope leads to blockages.
Omitting P-traps: Every plumbing fixture requires a P-trap to prevent sewer odors from backing up; do not skip this step for the sake of convenience.
Incorrect elbow usage: Whenever possible, use two 45°elbows for turns rather than a single 90°elbow; this ensures smoother water flow and reduces the risk of clogs.
Forgetting expansion joints: High-rise vertical pipes (stacks) must be fitted with expansion joints; otherwise, thermal expansion in summer can cause the pipe to push against and crack the joints.
Improper soil compaction for buried pipes: The base beneath buried pipes must be level and solid-avoid resting pipes on stones or striking them with large rocks during backfilling.
Insufficient glue application: Apply adhesive to both the socket and the spigot ends and insert fully; missing spots can lead to leaks.
Drainage system design basics
Bigger isn't always better: Pipe diameter should match the drainage volume; pipes that are too small may overflow, while those that are too large waste money. Vertical stacks must extend to the roof for venting; otherwise, pressure fluctuations inside the pipe can siphon water out of the traps, allowing odors to enter.
Use wye fittings (oblique tees) to connect horizontal pipes to vertical stacks for smoother flow; standard tees are prone to clogging. The number of bathrooms connected to a single stack depends on pipe diameter and the number of floors; do not exceed the design load. Buried outdoor pipes must be laid below the frost line to prevent freezing in winter.
Transportation and storage precautions
PVC drainage pipes are lightweight and easy to handle, but avoid dropping or throwing them. They become slightly more brittle in cold winter temperatures and are prone to cracking upon impact. Stack them on a flat, level surface and avoid stacking too high; ensure the base is even to prevent the pipes from warping over time.
Avoid prolonged exposure to direct sunlight, as UV rays accelerate aging; store pipes in a warehouse or keep them covered. Pipe fittings are susceptible to crushing, so do not place heavy objects on them; if the socket deforms under pressure, it will no longer be possible to insert the pipe.
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