Views: 0 Author: Site Editor Publish Time: 2026-03-11 Origin: Site
Blind flanges are the unsung heroes of pipeline systems—critical for sealing pipe ends, enabling maintenance, and ensuring operational safety across industries. For global buyers seeking high-quality, ASME B16.5-compliant blind flanges in carbon steel and stainless steel, Shangdian Flange stands as a trusted manufacturer based in China. With a focus on precision engineering, strict quality control, and customer-centric solutions, we specialize in delivering blind flanges that meet the rigorous demands of oil and gas, chemical processing, water treatment, and industrial piping projects worldwide.
An ASME B16.5 blind flange is a solid, disk-shaped component designed to close the end of a pipeline or vessel. Unlike other flange types (e.g., Weld Neck, Slip-On), it has no center hole—its primary function is to provide a leak-tight seal, isolate sections of a pipeline for inspection or repair, and prevent contamination of the system. The ASME B16.5 standard, developed by the American Society of Mechanical Engineers, governs the blind flange’s dimensions, pressure ratings, material requirements, and marking, ensuring compatibility with global pipeline systems.
Key specifications of our ASME B16.5 blind flanges include:
• Size Range: 1/2 inch to 24 inches (NPS), covering the full scope of ASME B16.5’s nominal pipe sizes.
• Pressure Ratings: Class 150, 300, 600, 900, 1500, and 2500, suitable for low-to-high pressure applications.
• Face Types: Raised Face (RF), Flat Face (FF), and Ring-Type Joint (RTJ), tailored to different sealing requirements—RTJ for high-pressure oil and gas systems, FF for low-pressure, non-critical applications.
• Manufacturing Process: Forged steel production, ensuring superior strength, durability, and resistance to fatigue compared to cast flanges.
As a specialized manufacturer, we offer ASME B16.5 blind flanges in two core materials—carbon steel and stainless steel—each optimized for specific operating environments. Understanding their differences helps you select the ideal solution for your project:
Our carbon steel blind flanges are crafted from A105, the industry standard for forged carbon steel components. A105 offers exceptional strength (tensile strength ≥485MPa), ductility, and cost-effectiveness, making it the preferred choice for general-purpose applications.
Key Advantages:
• Cost-competitive, ideal for bulk orders and large-scale projects.
• Excellent machinability and weldability, simplifying installation.
• Suitable for low-to-high pressure (Class 150–2500) and moderate temperature (≤425℃) environments.
• Common applications: Oil and gas pipelines, power generation plants, water treatment systems, and industrial piping.
Quality Assurance: Every carbon steel blind flange undergoes chemical composition testing (via spectrometer) and mechanical property analysis to ensure compliance with ASME B16.5 and A105 standards. We provide full Material Test Reports (MTRs) for traceability.
Our stainless steel blind flanges are available in 304, 304L, 316, and 316L grades—materials renowned for their corrosion resistance and hygiene properties.
Key Advantages:
• Superior corrosion resistance: 304/304L resists mild corrosives (e.g., water, air), while 316/316L (with molybdenum) handles harsh media (e.g., chemicals, saltwater, acids).
• Hygienic surface finish, making them suitable for food processing, pharmaceutical, and high-purity applications.
• High-temperature resistance (up to 870℃ for 316L), ideal for steam pipelines and chemical reactors.
• Durability and long service life, reducing replacement costs over time.
Quality Assurance: Our stainless steel blind flanges are tested for corrosion resistance (salt spray testing) and dimensional accuracy, with MTRs documenting chromium, nickel, and molybdenum content to verify grade authenticity.
As a dedicated manufacturer of ASME B16.5 blind flanges in carbon steel and stainless steel, we distinguish ourselves through four core commitments: quality, compliance, flexibility, and service.
Every blind flange we produce is manufactured to the letter of the ASME B16.5 standard. Our quality control team uses 3D measuring tools to verify dimensions (bolt hole spacing, flange thickness, face finish) with a tolerance of ±0.05mm, ensuring perfect compatibility with your pipeline components. We also conduct hydrostatic pressure testing (1.5 times the working pressure for 30 minutes) on every blind flange to eliminate leakage risks—critical for high-pressure applications.
To validate our quality and compliance, we hold a suite of international certifications, including ISO 9001 (quality management system), API 605 (oil and gas flange certification), and PED 97/23/EC (European pressure equipment directive). These certifications ensure our blind flanges meet the requirements of global markets, from North America to the European Union and the Middle East.
We understand that not all projects fit standard specifications. That’s why we offer OEM/ODM customization for ASME B16.5 blind flanges, including:
• Non-standard sizes (beyond 1/2–24 inches NPS).
• Special face finishes (e.g., smooth finish for low-pressure sealing).
• Custom markings (your company logo, project number, or part number).
• Material upgrades (e.g., duplex stainless steel, alloy steel for extreme conditions).
We also welcome small orders (MOQ of 10 pieces for standard blind flanges) and sample orders (1–5 pieces), allowing you to verify quality before committing to bulk purchases. Our lead times are competitive: 7–15 days for standard orders, 15–25 days for custom solutions.
As a manufacturer with no middlemen, we offer transparent, competitive pricing for carbon steel and stainless steel blind flanges. We also provide bulk order discounts to help you reduce project costs. Our monthly production capacity of 8,000 tons ensures we can handle large orders without compromising on delivery time. We ship to ports worldwide via trusted logistics partners (Maersk, COSCO), offering FOB, CFR, and CIF terms to suit your needs.
Our English-speaking team of engineers and sales specialists provides end-to-end support, from technical consultation to post-delivery service. We respond to inquiries within 24 hours, help you select the right material and pressure class for your application, and provide detailed quotes with no hidden fees. After delivery, we offer a 12-month warranty—if you encounter any quality issues, we’ll arrange for a replacement or refund promptly.
Our blind flanges are trusted by clients across industries for their reliability and performance:
• Oil and Gas: Used to seal pipeline ends in exploration, production, and transmission systems (carbon steel A105 for general use, stainless steel 316L for offshore applications).
• Chemical Processing: Ideal for isolating reactor vessels, storage tanks, and chemical pipelines (stainless steel 316L for corrosion resistance).
• Water Treatment: Sealing municipal water and wastewater pipelines (carbon steel A105 for cost-effectiveness).
• Power Generation: Used in steam boilers and turbine systems (carbon steel A105 for high-pressure, stainless steel 304 for auxiliary systems).
• Food and Pharmaceutical: Hygienic stainless steel 316L blind flanges for processing lines requiring contamination control.
Ordering from Shangdian Flange is simple and efficient:
1. Inquiry: Send your requirements (size, pressure class, material, face type, quantity, and delivery location) via email (your-email@shangdianflange.com), WhatsApp, or our website inquiry form. Include drawings or specifications if available.
2. Quote: We’ll provide a detailed quote within 24 hours, including pricing, lead time, shipping options, and payment terms (T/T or L/C).
3. Sample (Optional): Request a sample to inspect quality—we’ll ship it via your preferred courier.
4. Order Confirmation: Accept the quote, pay the deposit (30% for T/T), and we’ll start production.
5. Inspection & Shipment: We’ll conduct final inspection and arrange shipment, providing tracking information and all necessary documents (MTRs, certifications, B/L).
6. After-Sales: We follow up to ensure satisfaction and offer technical support if needed.
When it comes to ASME B16.5 blind flanges in carbon steel and stainless steel, Shangdian Flange combines precision manufacturing, strict compliance, and customer-focused service to deliver products you can rely on. Whether you need cost-effective carbon steel blind flanges for industrial piping or corrosion-resistant stainless steel options for harsh environments, we have the expertise and capacity to meet your needs.
As a China-based manufacturer with global reach, we offer the perfect balance of quality and value—factory-direct pricing, reliable delivery, and the flexibility to customize solutions for your unique project. If you’re seeking a trusted partner for ASME B16.5 blind flanges, look no further than Shangdian Flange. Contact us today to discuss your requirements, and we’ll help you find the ideal blind flange solution.
