In pipeline engineering and industrial fluid systems, the Hoop Flange plays a critical role in providing a reliable and leak-proof connection. This type of flange is widely recognized for its precision machining, strong sealing capacity, and compliance with multiple global standards, making it a preferred choice in high-demand projects.

Technical Standards and Dimensions

Hoop Flanges are manufactured in strict accordance with international norms, ensuring interchangeability and compatibility:

Standards: ASME/ANSI B16.5, B16.47, DIN EN 1092-1, JIS B2220, GOST

Pressure Classes: Class 150, 300, 600, 900, 1500, 2500 (PN 2.5 to PN 420)

Size Range: 1/2” (DN15) to 48” (DN1200)

Facing Types: Raised Face (RF), Flat Face (FF), Ring-Type Joint (RTJ)

Material Selection

Depending on the service environment, Hoop Flanges are available in multiple grades:

Carbon Steel: ASTM A105, A350 LF2 (for low-temperature service)

Stainless Steel: ASTM A182 F304/304L, F316/316L (corrosion resistance)

Alloy Steel: ASTM A182 F11, F22, F91 (high-temperature and pressure service)

Special Alloys: Duplex, Super Duplex, Nickel Alloys for offshore and chemical use

All materials are supplied with 3.1/3.2 Material Test Certificates (EN 10204) and optional third-party inspections (ABS, BV, DNV, LR, CCS) to ensure traceability and compliance.

Manufacturing and Quality Control

Our Hoop Flanges are produced using advanced forging and CNC machining processes:

Forging: open die / closed die forging for structural integrity

Heat Treatment: normalizing, quenching, and tempering for improved mechanical properties

Testing: UT (Ultrasonic Testing), RT (Radiographic Testing), PMI (Positive Material Identification), hardness testing, and hydrostatic pressure testing

This guarantees flanges meet dimensional accuracy, flatness tolerance, and sealing surface roughness required for critical installations.

Industrial Applications

The Hoop Flange is designed for demanding service conditions, including:

Oil & Gas Pipelines: high-pressure, sour service environments (H2S resistance)

Petrochemical Industry: exposure to aggressive chemicals and high-temperature fluids

Shipbuilding and Offshore: seawater corrosion resistance, marine certifications

Power Generation: steam lines, boiler connections, and high-temperature turbines

Advantages of Choosing Our Hoop Flanges

Certified production with ISO 9001, PED, API 6A, and CE compliance

Wide stock availability for standard sizes and quick delivery

Custom flange manufacturing based on drawings or special material requests

Export experience to more than 40 countries worldwide

For detailed specifications and ordering information, please refer to our product page:
👉 Hoop Flange Product Details