API certificate WN flange

General Description

Hebei Yadu Pipeline Equipment Group Co., Ltd. is a Chinese leading manufacturer & supplier of flanges,high-pressure pipe fittings and pipelines for over 40 years experience.

Our main products are High pressure flanges,elbows,tees,reducers,pipe caps,bend,forged socket fittings,forged threaded fittings etc.

Production range:Nominal Diameter:DN15-DN3600;Pressure class:150#,300#,600#,900#,2000#,3000#,6000#,9000#;Material:ASTM A105N/A182Gr.F304/L/F316/L/A350LF2/A694F42 to F70/WP5/
WP9/WP11/WP22/NACE MR-0175/Other Grade available on Request. International Standard: ASMEB16.5/HG20592/DIN2527,2573.2627-2638,2673,2552,2653,2655,2656,2641,2642,2565-2569/GOST12820/JIS B2220

Our products are widely used in industrial pipelines in petroleum, chemical, natural gas, electric power and nuclear power, metallurgy, shipbuilding, food, pharmaceutical and other industries.

The company has established a sound quality assurance system in strict accordance with the ISO9001:2000 quality management standard, and can organize production in accordance with international advanced standards, and has obtained "international standards ASTM, API, CE, GOST and other certifications", pressure piping components manufacturing certificate, and obtained the French "Factory Approval Certificate" from Classification Society, China Classification Society, American Bureau of Shipping, etc.

Yadu Group's products are sold to more than 30 countries,  all over Middle East, Southeast Asia, South America, Europe. Yadu Group is a manufacturer of high-pressure pipes and fittings serving the world. Competitive price, excellent quality and best service, we are your best choice. Looking forward to cooperating with your company. Yadu will work side by side with you to meet your needs.

Product Description

Weld neck flange is a kind of pipe fitting, which refers to a flange with a neck and a round pipe transition and connected to the pipe by butt welding.

Butt welding flange is not easy to deform, has good sealing, is widely used, has corresponding rigidity and elasticity requirements and reasonable butt welding thinning transition, the distance between the welding junction and the joint surface is large, and the joint surface is free from welding temperature deformation. Trumpet-shaped body structure, suitable for pipelines with large fluctuations in pressure or temperature or pipelines with high temperature, high pressure and low temperature, generally used for the connection of pipelines and valves with PN greater than 2.5MPa; also used for transportation of expensive, flammable and explosive on the medium line.

In pipeline engineering, flanges are mainly used for the connection of pipelines. In the pipelines that need to be connected, various flanges are installed. Wire flanges can be used for low-pressure pipelines, and welded flanges can be used for pressures above 4 kg. Two-piece method A gasket is added between the flanges and the flanges are fastened with bolts. The flanges of different pressures have different thicknesses and use different bolts. When the water pump and valve are connected to the pipeline, the parts of these equipment and equipment are also made into different parts. The corresponding flange shape is also called flange connection. Any connecting parts that are bolted on two planes and closed at the same time are generally called "flanges", such as the connection of ventilation ducts, such parts can be called "flange". For "flange parts". But this connection is only a part of the equipment, such as the connection between the flange and the water pump, it is not good to call the water pump "flange parts". Smaller ones, such as valves, can be called "methods" Orchid Parts".

Welding flanges should be marked according to the nominal diameter, nominal pressure, the form code of the sealing surface, the series code of the steel pipe used (the code for the metric pipe is "Series 2", and the standard number for the inch pipe is not marked) and the standard number.

The production process is mainly divided into four types: forging, casting, cutting and rolling.

skills requirement

1. The level and technical requirements of butt welding flanges shall meet the corresponding requirements of JB4726-4728. 1. Carbon steel and austenitic stainless steel forgings with nominal pressure PN of 0.25MP-1.0MPa are allowed to use grade I forgings. 2. In addition to the following regulations, forgings with a nominal pressure PN of 1.6MPa-6.3MPa should meet the requirements for forgings of Class II or above. 3. Those who meet one of the following conditions shall meet the requirements of III and forgings: (1) Forgings for flanges with nominal pressure PN ≥ 10.0MPa; (2) Chrome-molybdenum steel forgings with nominal pressure PN>4.0MPa; (3) Nominal Ferritic steel forgings with pressure PN>1.6MPa and working temperature ≤-20 degrees Celsius.

2. Butt welding flanges are generally made of forgings or forgings. When it is made of steel plate or section steel, it must meet the following requirements: 1. The butt welding flange shall be ultrasonically inspected, and there shall be no delamination defects; 2. It shall be cut into strips along the rolling direction of the steel, and bent into a ring by butt welding. , and make the surface of the steel form the cylinder of the ring. It is not allowed to use steel plate to directly machine into butt welding flange with neck; 3. The butt weld of the ring should be full penetration weld; 4. The butt weld of the ring should be subjected to post-weld heat treatment and 100% radiation or Ultrasonic flaw detection, and radiographic flaw detection meets the requirements of Class II of JB4730, and ultrasonic flaw detection meets the requirements of Class I of JB4730.

3. The outside slope of the neck of the butt welding flange should not be greater than 70°. Welding flanges strictly control technical parameters during production and welding to ensure that they can fully play their role and value in production and use.

Test and Inspection Equipments

Certifications

Why Choose Yadu Group

More than 40 years manufacturing experience in high pressure pipe fittings and flange.

Top quality products, API Certificate, CE Certificate, ERC Certificate, EC Certificate etc.

Products can be customized.

Fast response time, we promise to reply customer’s email within 24 hours

Competitive prices for giving clients the maximum profit

The shortest lead times, plenty of equipments and workers to ensure the delivery on time

Best quality after-sales service for every customer

Please fell free to share your inquiry to us. 

HEBEI YADU PIPELINE EQUIPMENT GROUP CO.,LTD

Add: Liu Tan Industry Area,Mengcun Cangzhou City, Hebei Province,China.

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Tel:+86 18830732387

Mob/Whatsapp/Wechat: +86 18830732387

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