Shanxi Xinshunda Flange Manufacturing Co., Ltd. supplies high-precision AWWA Class D flanges engineered for medium-pressure waterworks, municipal water supply, wastewater treatment and large-diameter pipeline systems. Fully compliant with AWWA C207, our Class D flanges provide stable sealing, reliable pressure containment and long service life for water utility and industrial infrastructure projects. With 19 years of forging and machining expertise, we serve 3,800+ clients in over 70 countries worldwide.
Product Description
AWWA Class D flanges are steel ring flanges and blind flanges designed for water utility service per AWWA C207. Pressure ratings are 175 psi for sizes 4″–12″ and 150 psi for sizes 14″ and larger. They feature standard bolt circles compatible with Class 125 (ASME B16.1) and Class 150 drilling, ensuring interchangeability with valves, fittings and steel pipelines for potable water, raw water and non-corrosive fluid systems. Our Class D flanges are precision machined for perfect fit and zero leakage.
Product Feature and Application
Key Features
- Rated for medium-pressure water systems (150–175 psi)
- Full compliance with AWWA C207 dimensions and tolerances
- Large-diameter range up to 144″ for trunk water pipelines
- Flat Face (FF) for reliable rubber-gasket sealing
- High rigidity and uniform stress distribution
- Ring and blind types available
- Ideal for potable water, wastewater and non-hazardous fluids
- Universal interchangeability with waterworks valves and fittings
Main Applications
- Municipal water transmission and distribution networks
- Water treatment plants, pump stations and reservoir connections
- Wastewater and storm-water drainage systems
- Large-diameter steel pipeline projects
- Industrial water circulation and utility lines
- Civil engineering and water infrastructure
- Pipeline maintenance, pressure testing and system isolation
Product Parameter
| Standard | AWWA C207 Class D |
| Pressure rating | 175 psi (4″–12″) | 150 psi (≥14″) |
| Nominal diameter | 4″ – 144″ (DN100 – DN3600) |
| Type | Steel Ring Flange, Blind Flange |
| Face type | Flat Face (FF) |
| Surface roughness | Ra 1.6–3.2 μm (125–250 µin) |
| Materials |
Carbon steel: A105, A181, carbon steel plate Stainless steel: F304, F316 (upon request) |
| Working temperature | −10 °C – 120 °C |
| Certification | EN 10204 3.1 Material Test Certificate, Mill Test Report |
| Compatibility | Matches ASME B16.1 Class 125 & B16.5 Class 150 bolt patterns |
Production Details
Each AWWA Class D flange is manufactured under strict quality control:
- Raw material inspection with mill certification and spectral analysis
- Precision plate cutting, forging or rolling per AWWA C207
- CNC machining for accurate OD, ID, thickness and bolt holes
- 100% dimensional inspection using calibrated gauges and CMM
- Visual inspection for surface defects and finish
- Hydrostatic testing to verify pressure integrity
- Anti-corrosion treatment: anti-rust oil, epoxy, FBE or zinc coating
- Permanent marking: size, class, material, standard, heat number, batch
Production Display
Our ISO 9001-certified manufacturing base is equipped with large-scale forging presses, heavy-duty CNC machining centers, dedicated coating lines and professional testing laboratories. Full process traceability from raw material to finished goods. Third-party inspection by SGS, BV, TÜV or customer-authorized agencies available upon request.
Packaging & Transportation
- Surface treatment: Anti-corrosion oil, epoxy coating or FBE
- Packaging: Protective wrapping, export wooden crates, steel pallets
- Labeling: Size, class, material, standard, batch, heat number
- Documents: Commercial invoice, packing list, certificate of origin, material test report
- Transportation: Sea, land and bulk logistics for large-diameter products
- Global delivery to over 70 countries with project-based solutions
After-sales Service
We provide full-life cycle technical support for AWWA Class B flanges:
- Professional consultation on selection, installation and gasket matching
- Custom drilling, facing and coating per project requirements
- Timely response to after-sales inquiries and quality claims
- On-site technical support and installation guidance
- Long-term stable supply and inventory for large projects
Why Choose Shanxi Xinshunda?
- 19 years of professional flange manufacturing experience
- Full compliance with AWWA C207 and international standards
- Complete large-diameter range 4″–144″ with fast customization
- Strict quality control and full testing documentation
- Direct factory pricing with stable lead times
- Multilingual service and global project logistics support
Contact us today for product catalogs, quotations or customized solutions for your AWWA Class B flange waterworks projects.
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