The classification of UPVC drainage pipes is primarily centered around their application scenarios and structural performance, aimed at matching different engineering requirements through standardized specifications and models. The classification logic is clear, with divisions mainly based on wall structure, connection method, nominal outer diameter, and environmental attributes.
I. Classification by Pipe Wall Structure and Function (Core Dimension)
This is the most intuitive way to distinguish the purpose of UPVC pipes, directly determining their suitability for specific applications.
Category Type | Industry Standard Features | Polygon Piping Corresponding Products | Typical Application Scenarios |
Solid Wall Pipe | Pipe wall is of homogeneous solid structure, with smooth interior and exterior walls. This is the most basic and common type for indoor building drainage systems, complying with GB/T 5836.1 standards. It offers stable pressure resistance, simple processing, but relatively higher material consumption. | PVC-U Eco-friendly Lead-Free Drainage Pipe: Offers chemical corrosion resistance, high impact strength, and provides 30% higher flow capacity than cast iron pipes of the same diameter. | Indoor building sewage/wastewater vertical stacks and horizontal branch pipes, as well as outdoor buried drainage. |
Spiral Sound-Attenuating Pipe | The interior wall is designed with several raised helical ribs. When water flows through, the helical ribs guide the water to spiral down along the pipe wall, significantly reducing water-air impact and pipe wall vibration, thereby lowering noise (typically reducing noise by 5-10 dB). | PVC-U Structured Wall Spiral Sound-Attenuating Pipe (including standard solid wall/hollow wall, and reinforced solid wall spiral pipes): High drainage flow + noise reduction. | High-rise residential bathroom vertical stacks, hotels, hospitals, and other venues requiring high noise reduction. |
Double-Wall Corrugated Pipe | The outer wall is hollow and corrugated (increasing ring stiffness), while the inner wall is smooth (ensuring flow). This structure significantly saves materials and is lighter in weight while ensuring pressure resistance. | Outdoor Buried Drainage Series (Structured Wall): High ring stiffness (e.g., SN4/SN8), resistant to acid/alkali corrosion. | Municipal sewage discharge, outdoor buried drainage in building complexes, and cable conduits. |
II. Classification by Connection Method
The connection method directly affects installation efficiency and the sealing reliability of the pipeline system.
Connection Type | Industry Standard Features | PolygonPiping Application | Applicable Scenarios |
Solvent Cement Joint | Uses socket-type structure with specialized PVC-U adhesive for chemical welding. Connection is strong, with good sealing, and is non-detachable. | Indoor exposed or concealed installation of solid wall pipes, spiral pipes (DN ≤ 110mm branch pipes). | Indoor fixed, non-detachable locations (e.g., horizontal branch pipes). |
Rubber Ring Joint | A rubber sealing ring is embedded in the socket, relying on the elasticity of the sealing ring for sealing after pipe insertion. It is a flexible connection, allowing for some axial displacement and angular deflection, and is detachable. | Outdoor buried double-wall corrugated pipes, large-diameter vertical stacks (DN ≥ 110mm); structured wall drainage pipes (to handle settlement). | Outdoor, buried locations, or areas requiring flexible connections (e.g., base of vertical stacks). |
III. Classification by Nominal Outer Diameter (Specification)
UPVC drainage pipes have standardized nominal outer diameter (dn) sequences to match different flow requirements.
Specification Type | Typical Specifications | Core Application Scenarios |
Small Diameter | DN50, DN75, DN110 | Used for drainage branch pipes and vent pipe connections for fixtures like sinks, floor drains, and showers. |
Medium to Large Diameter | DN160, DN200, DN250, DN315 | Used for building drainage vertical stacks (main pipes), outdoor drainage mains, and collector pipes. Among these, DN110 is a critical transition size for connecting indoor horizontal branch pipes to vertical stacks. |
IV. Classification by Environmental Attributes
With increasing environmental requirements, the GB/T 5836.1-2018 standard explicitly introduces classification based on lead content.
Category Type | Industry Standard Features | PolygonPiping Products | Application Scenarios |
Lead-Free Pipes | Use environmentally friendly heat stabilizers like calcium-zinc (Ca/Zn) to replace traditional lead-based stabilizers. This is currently the mainstream trend for indoor building drainage, aligning with green building requirements. | PVC-U Eco-friendly Lead-Free Drainage Pipe: Lead-free formula, service life ≥ 50 years, aging resistant. | Residential, public buildings, and other indoor drainage applications (mainstream trend). |
Lead-Containing Pipes | Use traditional lead-based heat stabilizers, with their application gradually becoming restricted, especially in residential and public buildings. | / | Renovation of old projects (gradually being phased out). |
V. Polygon Piping Special Product Supplements (Scenario Extensions)
In addition to the general classifications, PolygonPiping also provides dedicated products for niche scenarios.
1. PVC-U Rainwater Pipe:
● Raw Material: PVC resin + anti-aging agents, formed via extrusion/injection molding.
● Features: Service life ≥ 50 years, smooth water flow, not easily clogged, lightweight, cost-effective, equipped with UV protection, sun resistance, and anti-mold properties (solving issues of ordinary PVC pipes aging from sun exposure).
● Scenario: Rainwater harvesting and drainage systems.
2. Pipeline Relocation/Renovation Series:
● Products: 60×35 flat pipe relocation series, 110 flat pipe relocation series, vertical pipe renovation series, structured wall drainage series.
● Scenario: Drainage renovation of existing buildings, pipeline layout optimization (e.g., toilet relocation in bathrooms).
Conclusion
The essence of UPVC drainage pipe classification is the mapping of "performance-to-scenario".
● For indoor branch pipes, solid wall adhesive-bonded pipes are preferred.
● For high-rise stacks pursuing quiet operation, spiral sound-attenuating pipes are selected.
● For outdoor buried applications requiring pressure resistance, double-wall corrugated rubber ring-jointed pipes are chosen.
When selecting, it is essential to comprehensively consider the three-dimensional matching of structure, connection method, and specification diameter to build an economical and reliable drainage system.
Polygon Piping's PVC drainage product system is built around a comprehensive range of building drainage scenarios (residential, industrial, rainwater, renovation), covering ordinary drainage, eco-friendly lead-free, rainwater pipes, structured wall drainage, and pipeline renovation series, combining performance advantages with scenario adaptability.
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