PETROL STEEL Weld Neck Flanges - Core connection solutions for high-pressure pipeline systems

PETROL STEEL CO., LTD produces various kinds of flanges, including Weld neck flanges, Blind flanges, Slip-on flanges, Socket Weld flanges, Lap Joint flanges, Threaded flanges, Weldlet, socklet, elbolet, sweepolet, threadlet, Latrolet, Brazolet, Coupolet, Nipolet, Sweepolet, Weldoflange, Flexolet, etc.

The materials we can produce are carbon steel, stainless steel, alloy steel, Carbon Steel, Stainless Steel, Duplex, Alloy Steel, Nickel Alloys, Super Alloys, Titanium, Cladding etc.

As one of the company's core products, the technical advantages and value of PETROL STEEL Weld Neck Flanges are reflected in: Our welded neck flange (WN flange) adopts a cone neck butt welding structure. It uses a double-sided welding process to achieve a permanent connection between the pipeline and the equipment. Its overall forging process makes the tensile strength reach 1.5 times that of the flat welding flange. PETROL STEEL Weld Neck Flange is the preferred solution for conveying high pressure, high temperature and dangerous media.

The key technical process of PETROL STEEL Weld Neck Flanges is: the connection method is double-sided girth weld butt welding (BW process), the installation angle is the verticality between the flange surface and the pipeline axis ≤0.5°, and the pressure level is 150LB~2500LB (PN20~420Bar).
As a key connection component of the pressure pipeline system, PETROL STEEL Weld Neck Flange adopts a cone neck transition structure to form a permanent welding connection with the pipeline. Its unique structural design makes the stress distribution more uniform, and it has higher structural integrity and sealing reliability than other flange types. It is particularly suitable for the transportation of high temperature, high pressure and corrosive media.

The core technical parameters of PETROL STEEL Weld Neck Flanges are: connection system and its welding method: full penetration butt welding (Butt Weld), Bevel standard: ASME B16.25 standard V-type Bevel. Its installation accuracy is: flange surface verticality ≤0.5°, concentricity deviation ≤1mm/m. Its pressure and temperature levels meet the grade standards under the standard system. The applicable range of temperature and pressure complies with the American standard (ASME) Class 150-2500-29℃~+815℃, and the European standard (EN) PN10-PN400-50℃~+650℃.

The performance advantages of PETROL STEEL Weld Neck Flanges in engineering are: it has structural reliability and stability. Its cone neck transition design reduces stress concentration by 45%, and the products fully comply with API 6A seismic certification (SSE working conditions). It has high-quality sealing technology and ultra-low leakage rate. The raised face (RF) seal can reach 10^-7 mbar·L/s, and the ring joint (RTJ) fully complies with API 6A 6BX standards. PETROL STEEL Weld Neck Flange is cost-effective and has low maintenance costs. Its design life is ≥30 years (3mm corrosion allowance) and supports online non-destructive testing.

Typical engineering cases of PETROL STEEL Weld Neck Flanges include: it is mostly used in multinational energy projects. Flanges for connecting the China-Russia East Line Natural Gas Pipeline: Material X80 pipeline steel flange, specification: DN1420 Class900, ambient temperature: -40℃~+60℃.
It is also used in deep-sea oil and gas development projects, such as installation applications in Brazil's subsalt oil fields. Its material is duplex stainless steel, the working water depth is 3000 meters, and the product meets the DNV-OS-F101 certification requirements.

The selection and application guide of PETROL STEEL Weld Neck Flanges can be used for users' reference: When the pressure of the high-pressure pipeline is ≥Class600, it is recommended to use RTJ sealing surface flanges, which require post-weld heat treatment.

If PETROL STEEL Weld Neck Flanges are used in a corrosive environment, our company recommends giving priority to duplex stainless steel materials, whose corrosion rate is ≤0.1mm/year, which is fully qualified for customers' use requirements for harsh working conditions.

The installation specifications of PETROL STEEL Weld Neck Flanges are also essential. Its welding process qualification complies with ASME IX, and 100% radiographic inspection can be carried out before shipment. And third-party inspection can be carried out before shipment according to customer requirements and specifications.

Carbon steel
ASTM A105/A266 Gr.2 (high temperature carbon steel flanges)
ASTM A350 LF1 to LF3 (low temperature carbon steel flanges)
ASTM A694 Gr. F42/F52/F56/F60/F65 (high yield carbon steel flanges to match API 5L linepipes)

Alloy Steel
ASTM A182 Gr. F1/F2/F5/F9/F11 Cl.2/F12 Cl.2/F22 Cl.3/F91 (alloy steel flanges)

Stainless / Duplex Steel
ASTM A182 F304/304L, 316/316L, 321, 347, 348 (stainless steel flanges), 904/904L
  • ASTM A182 F51 (duplex flanges)/F53-F55 (superduplex flanges)

The dimensions and the tolerances under the standards that we can produce:
ANSI B. 16.5 – Steel Pipe Flanges and Flanged Fittings (½ inch to 24 inch nominal diameter)
MSS SP.6 – Flange Facings
MSS SP.25 – Marking of flanges
MSS SP.39 – Bolts and Nuts for Flanges
MSS SP.44 – Large Diameter Pipeline Flanges. (Over 24 inch dia)
API-605 – Large Diameter Flanges for Petroleum Usage. (Over 24 inch dia)

Contact Us Today, sales@petrolsteel.com, whatsapp: +86 159 0035 7871 for the best price and instant delivery.

For more tehchnical information and available stocks of superior flanges and fitings, please click the links:
https://www.petrolsteel.com/PETROL-STEEL-Weldolet-flanges-the-branching-platform-reliable-branching-expert-for-industrial-piping-systems-n.html
https://www.petrolsteel.com/High-Pressure-Flange-p.html
https://www.petrolsteel.com/Forged-Pipe-Fitting-p.html