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Long Distance Trunklines Large Diameter Carbon Steel Blind Flanges custom

Long Distance Trunklines Large Diameter Carbon Steel Blind Flanges Manufacturers

-- Steady & Reliable Manufacturer --

Solid Sealing for Major Pipelines

In long-distance oil and gas trunklines, terminal sealing and pipeline isolation are critical for safety and testing. Our Large Diameter Carbon Steel Blind Flanges are engineered to handle the massive pressure loads found in cross-country transmission networks. Manufactured from high-strength forged carbon steel, these flanges provide a permanent or temporary closure for pipeline ends, valves, and vessel openings. As a specialized manufacturer, we focus on the structural integrity of the center disc, ensuring it can withstand maximum system pressure and hydrostatic testing without deformation. These flanges are forged to ASME B16.47 Series A or B standards, providing the heavy-duty sealing required for DN600 to DN2000 pipelines. Their robust construction and corrosion-resistant coatings make them the industry standard for securing the world's most critical energy infrastructure.

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Large Diameter Technical Specifications

Parameter Large Diameter Specification
Material Grades ASTM A105, A694 F52, F60, F65, F70
Standards ASME B16.47 Series A & B, MSS SP-44
Pressure Classes Class 150, 300, 600, 900
Size Range 26" to 80" (DN650 - DN2000)
Face Finish Smooth, Concentric Serrated, or RTJ
Coating Black Paint, Anti-rust Oil, Epoxy, or FBE

Pipeline Infrastructure Applications

These large-diameter blind flanges are primarily utilized in midstream oil and gas pipelines for sealing off sections during hydrostatic testing or maintenance. They are the standard closure for pigging stations and future tie-in points on cross-country trunklines. In the municipal sector, they are used for large-scale water distribution mains and sewage treatment headers. They are also essential in the construction of storage tank farms, where they serve as manway covers and terminal seals for large-diameter storage tanks. Because of their high pressure-bearing capacity, they are also used in power plant cooling water circuits and high-volume intake systems. Any large-scale industrial piping project that requires a removable, high-integrity terminal seal will depend on these forged blind flanges.

Structural & Safety Advantages

  • Extreme Pressure Containment: Solid forged disc construction provides the highest possible safety factor for terminal isolation.
  • Series A/B Compatibility: Available in both ASME B16.47 Series A (thicker/heavier) and Series B (compact) to match project bolting requirements.
  • Solid Grain Integrity: Forging eliminates the risk of internal voids or cracks, which is critical for high-pressure gas service.
  • Custom Coating Options: Can be supplied with Fusion Bonded Epoxy (FBE) or other coatings to match the buried pipeline's protection system.

Trade & Heavy Logistics Info

We support payments via T/T and Irrevocable L/C at sight. Due to the significant weight and size of these flanges, we utilize specialized heavy-duty logistics. Each large-diameter flange is coated with a thick anti-rust layer and secured on custom-built steel or reinforced wooden cradles to prevent movement during sea transit. We provide comprehensive documentation, including 3.1 Mill Test Certificates, Ultrasonic Testing (UT) reports, and dimensional verification. We ship globally from major deep-water ports like Shanghai, offering both FCL and break-bulk options. Our team is experienced in the complex shipping requirements of large pipeline projects, ensuring that your critical terminal components arrive on-site without damage or delay.

  • Q: What is the difference between Series A and Series B large diameter flanges?
  • A: Series A flanges are thicker, heavier, and use larger bolts, making them suitable for higher external loads. Series B are more compact and use more (but smaller) bolts, often used for replacement or compact designs.
  • Q: Can these flanges be used for hydro-testing?
  • A: Yes, these are the primary choice for hydro-test blinds, provided the pressure class matches the test pressure requirements of the pipeline.
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Jiangyin Gaoxin Pipe Fittings Co., Ltd.
About Us
JIANGYIN GAOXIN PIPE FITTINGS CO.,LTD.
Our company is a professional manufacturer of pressure piping components. As Long Distance Trunklines Large Diameter Carbon Steel Blind Flanges Manufacturers，Our product range covers butt-weld, socket-weld, and threaded pipe fittings, including flanges and customized non-standard parts. These products are widely used in industries such as oil & gas, chemical processing, power generation, shipbuilding, papermaking, metallurgy, pharmaceuticals, and food processing. We manufacture according to standards such as ASME, EN,JIS,DIN,ANSI,GOST, MSS, GB/T,HG, DL, SH, SY,and have a complete range of inspection equipment, a strict quality control system, and various certifications（PED,AD2000,EAC, ABS,BV, DNV,NORSOK M650, ISO9001,ISO14001,ISO45001,etc.）, making us a leader in the industry.

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