The D400 Double Triangular Manhole Cover with Circular Frame Opening is a high-performance access solution engineered to exceed EN 124-2:2015 standards, delivering unmatched strength and stability for heavy-traffic environments such as highways, industrial facilities, and airport runways. Featuring a unique dual-triangular design and precision-crafted circular frame, this system ensures optimal load distribution, enhanced safety, and long-term durability in the most demanding applications.
Key Innovations & Features:
- Advanced Double Triangular Design
- Dual-triangular geometry reinforces structural integrity, distributing vertical and lateral loads evenly to prevent deformation under extreme pressure (up to 40 tons, D400/C250 class).
- Interlocking triangular panels eliminate stress concentration points, validated through permanent set testing for cyclic loading resistance.
- Circular Frame Opening with Enhanced Sealing
- Precision-machined circular frame ensures a perfect fit with the cover, minimizing gaps and vibration noise during vehicular traffic.
- Integrated double-seal system combines EPDM rubber and bituminous compounds for 100% watertight performance, even in flood-prone areas.
- Heavy-Duty Material Engineering
- Forged from GGG500/7 ductile iron (500 MPa tensile strength, 7% elongation), offering superior impact resistance and fatigue strength compared to standard cast iron.
- Hot-dip galvanized coating + epoxy-polyester finish provides triple-layer corrosion protection against abrasion, chemicals, and salt spray (tested per ISO 9227).
- Safety-Centric Engineering
- Anti-slip diamond tread pattern meets BS 7976-2 standards for pedestrian safety in wet conditions.
- Boltless locking mechanism deters unauthorized access while simplifying maintenance operations.
- Global Compliance & Custom Solutions
- Certified to EN 124-2:2015, ISO 9001, and CE Marking for EU and international project compliance.
- Customizable dimensions (300–900 mm), load classes (up to F900), and surface treatments (epoxy, zinc-aluminum) for specialized infrastructure needs.
Applications:
Designed for high-stress environments: motorways, port terminals, rail networks, and mining sites requiring robust, tamper-proof access solutions.
Why This Product Stands Out?
As a leader in heavy-duty infrastructure components, we combine German-engineered precision with global logistics expertise. The D400 system undergoes rigorous third-party testing (including 100,000-cycle fatigue tests) to guarantee performance, backed by OEM/ODM support and 15-year warranties.
| Family: | Municipal |
| Packaging Qty: | 5 |
| Product Type: | Access Covers |
| Certified Class: | D400 |
| Surface Finish: | ANTI-SLIP OTHER SURFACE |
| Clear Opening: | 600 mm |
| Clear Opening Length (Hinge Side): | 600 mm |
| Clear Opening Width: | 600 mm |
| Flange Outer Length: | 750 mm |
| Flange Outer Width: | 750 mm |
| Frame Height: | 150 mm |
| Weight: | 80 kg |
| Watertight: | No |
| Cover/Grating Length: | 600 mm |
| Hinged: | No |
| Handling Key: | CLE BA1 BS / 511793 |
| Locking Key: | N/A |
Ductile iron manhole cover specifications and parameters
| Parameter | Specification/Value |
|---|---|
| Material | Ductile Cast Iron (Grade 500-7) |
| Standard Compliance | EN 124, BS 497, ASTM A536, ISO 1083 |
| Shape | Round, Square, Oval |
| Load Rating | A15, B125, C250, D400, E600, F900 (EN 124 load classes) |
| Load Bearing Capacity | 1.5 – 90 tons (depending on the rating) |
| Size (Diameter/Length) | 300mm – 1500mm (depending on type and design) |
| Thickness of Lid | 20mm – 60mm (depending on the load class) |
| Weight | 10 kg to 150 kg (depending on size and class) |
| Cover Surface | Smooth, Anti-slip, Textured for grip |
| Corrosion Resistance | Excellent, with epoxy coatings or bituminous treatment |
| Gasket Type | Rubber, Neoprene, EPDM |
| Sealing Mechanism | Bolt-down, Locking system, Hinged |
| Drainage Holes | Yes, optional (for water drainage) |
| Coating Type | Bitumen coated, Epoxy coating, Hot-dip galvanizing |
| Temperature Resistance | -30°C to +150°C (depending on coating type) |
| Fire Resistance | Flame-retardant (meets local standards for fire resistance) |
| Noise Level | Low noise design for urban areas |
| Ventilation | Optional vented covers for gas or sewage systems |
| Color | Black, Gray, Custom colors available |
| Manufacturing Process | Sand casting, Lost wax casting, Centrifugal casting |
| Edge Type | Flat, Raised, Beveled, or Reinforced edges |
| Bearing Surface | Cast iron, Epoxy, Stainless Steel (optional) |
| Longevity | 50+ years with proper maintenance |
| Environmental Compliance | RoHS, REACH, and other regional environmental standards |
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