Xinyue Steel is a leading international supplier specializing in the manufacturing and global distribution of Large Diameter Weld Neck (WN) Flanges, a critical component for modern water transmission and distribution pipeline infrastructure. Our recent project in the Middle East demonstrates our technical capacity and reliability in serving major water sector developments worldwide.
Recent Project: Water Pipeline Construction, Middle East
Product Supplied: Large Diameter Weld Neck Flanges
Specifications: Outer Diameter (OD) range from 60 inches to 88 inches
Application: Large-Scale Water Transmission Pipeline Construction

This project involved supplying super-large WN flanges to connect major pipeline segments, highlighting our expertise in producing heavy-duty components that meet the exacting demands of high-volume water transport systems.
Specializing in Large Diameter Flanges for Water Infrastructure
We focus on providing reliable, high-performance flanges for the global water and wastewater industry. Our products are engineered for durability, leak-proof performance, and long service life in both above-ground and buried pipeline applications.
Product Specifications & Capabilities:
Flange Types: Primarily Weld Neck (WN) for high-integrity, butt-welded connections in main transmission lines.
Size Range:
Standard Large Diameter: 24″ to 60″
Super Large / Custom Diameter: 60″ to 120″ and above (as per project requirements).
Pressure Ratings: Commonly supplied in ANSI Class 150, 300, and 600, suitable for various water pipeline pressure classes. Custom designs for specific pressure needs are available.
Material Standards:
Carbon Steel: ASTM A105, A350 LF2 (for low-temp), A694 (high-yield for pipelines).
Stainless Steel: ASTM A182 F304/316.
Other materials available upon request.
Facing: Typically Raised Face (RF) or Flat Face (FF). Ring Type Joint (RTJ) available.
Standards: Manufactured to ASME B16.5, ASME B16.47 Series A & B, EN 1092-1, or customer-specific drawings.
Why Choose Xinyue Steel for Your Water Pipeline Flanges?
Engineering Expertise: We provide technical support for flange selection, specification review, and custom design for non-standard applications.
Heavy Manufacturing Capacity: Our facilities are equipped with large-scale forging, machining, and testing equipment.
Full Certification: All flanges come with complete Material Test Reports (MTRs), including chemical analysis and mechanical properties.
Quality Assurance: Strict quality control from material sourcing to final machining, including dimensional inspection and Non-Destructive Testing (NDT) as required.
Project Logistics: Expertise in handling, packaging, and shipping oversized and heavy components globally.
Applications in Water Sector:
Raw Water Transmission Mains
Treated Water Distribution Networks
Intake & Outfall Lines
Pump Station Piping
Reservoir & Treatment Plant Piping
Get a Quick Quote for Your Project
Whether you are an engineering firm, contractor, or government agency involved in water infrastructure development, Xinyue Steel can supply the large-diameter flanges you need. Submit your specifications for a fast and competitive quotation.
Contact Us for Large Diameter Flange Solutions:
Website: https://www.xysteelpipe.com
Email: sales@xysteelpipe.com
WhatsApp: +0086 189 7484 9825
Xinyue Steel – Connecting the World’s Water Supply with Reliable Pipeline Components.