Nominal Diameter (DN) | Outer Diameter da (Nominal Size) | Outer Diameter Tolerance | Wall Thickness S (Nominal Size) | Wall Thickness S (Minimum) | Length (mm) |
40 | 48 | +2 | 3.0 | 2.5 | 3000±20 |
50 | 58 | +2 | 3.5 | 3.0 | 3000±20 |
70 | 78 | -1 | 3.5 | 3.0 | 3000±20 |
75 | 83 | -1 | 3.5 | 3.0 | 3000±20 |
100 | 110 | -1 | 3.5 | 3.0 | 3000±20 |
125 | 135 | +2 | 4.0 | 3.5 | 3000±20 |
150 | 160 | -2 | 4.0 | 3.5 | 3000±20 |
200 | 210 | +2.5 | 5.0 | 4.0 | 3000±20 |
250 | 274 | +2.5 | 5.5 | 4.5 | 3000±20 |
300 | 326 | -2.5 | 6.0 | 5.0 | 3000±20 |
Size（in） | Inner diameter（mm） | Outer Diameter（mm） | Wall Thickness T (mm) Nominal Dimension | Min | Length（mm） |
1” | 38.1±2.29 | 48.26±1.52 | 4.06 | 3.3 | 3048±13 |
2” | 49.8±0.29 | 59.69±2.29 | 4.06 | 3.3 | 3048±13 |
3” | 75.2±2.29 | 85.09±2.29 | 4.06 | 3.81 | 3048±13 |
4” | 100.08±2.29 | 111.25 +2.29 -1.27 | 4.89 | 3.81 | 3048±13 |
5” | 125.4±2.29 | 134.62 +2.29 -1.27 | 4.89 | 3.81 | 3048±13 |
6” | 150.88±2.29 | 160.02 +2.29 -1.27 | 4.83 | 3.81 | 3048±13 |
8” | 201.68±3.3 | 212.85 +3.3 -2.29 | 5.84 | 4.83 | 3048±13 |
9” | 254±3.3 | 268.22+2.29 | 7.11 | 5.59 | 3048±13 |
Our centrifugally cast grey cast iron drainage pipes are purpose-built flexible-joint piping solutions for commercial, municipal and industrial drainage systems. Manufactured with state-of-the-art centrifugal casting technology, they deliver a dense, uniform microstructure, consistent wall thickness, and smooth inner/outer surfaces free of casting defects like sand holes and blowholes.
Fully compliant with key global and national standards including ISO 6594, DIN 19522/EN 877, GB/T 12772, ASTM A888, CISPI 301 and KSD 4307, our pipes have passed rigorous inspection and provincial-level certification by the Hebei Provincial Product Quality Supervision and Inspection Institute.
Featuring a flexible connection system paired with custom stainless steel clamps and EPDM rubber sealing rings, they enable fast, tool-free installation with reliable, leak-proof performance. Ideal for sewage, rainwater and industrial wastewater discharge, they are widely used in high-rise buildings, commercial complexes, municipal projects and industrial parks.
Centrifugal casting creates a dense, high-strength structure with exceptional compressive and impact resistance. It effectively absorbs stress from foundation settlement and thermal expansion/contraction, ensuring no cracking or deformation over decades of reliable service.
Matched with flexible clamps and EPDM seals, the joints provide superior shock absorption, noise reduction and leak prevention. They eliminate common issues like joint seepage, noise pollution and damage from thermal movement, ensuring long-term system integrity.
The ultra-smooth inner wall minimizes hydraulic friction, preventing dirt buildup and blockages. It maintains consistent drainage efficiency and excellent flow characteristics year-round, reducing costly dredging and maintenance needs.
As a non-combustible material, cast iron delivers exceptional fire resistance—no flame spread, no toxic fumes in fires, fully meeting building fire codes. The material is non-toxic, non-contaminating to water systems, and safe for all drainage applications.
Complete range of pipes and fittings with modular flexible connections requires no welding or sealant. Simple, tool-free assembly cuts installation time and labor costs significantly. Easy access for inspection, repair and replacement further lowers total cost of ownership.
Fully aligned with global drainage standards, the pipes are fully interchangeable with all standard pipe fittings and accessories. Available in sizes from DN50 to DN300, they adapt to virtually any commercial, municipal or industrial drainage project requirement.
