ASME B16.47 Series A (MSS SP-44) Large Diameter Weld Neck Flange

Short Description:

Product: ASME B16.47 Series A Large Diameter Weld Neck Flange
Size: NPS 22"-48" DN550-DN1200
Pressure: Class150-Class900lb
Material: Carbon Steel, Stainless Steel
Connection mode: Welding
Production method: Forged
Acceptance: OEM/ODM, Trade, Wholesale, Regional Agency,
Payment: T/T, L/C, PayPal

Any inquiries we are happy to reply, please send your questions and orders.
Stock Sample is Free & Available

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Product Introduction


Size: NPS 22″-48″ DN550-DN1200




Carbon Steel A105 Q235B

Stainless Steel 304 316 321

Large diameter welding neck flange is a flange connection method used to connect large diameter pipes and equipment. It has a longer neck for better support and strength and is suitable for large diameter piping systems and high-pressure environments. This flange design is designed to reduce stress concentrations, thereby increasing the reliability of the connection.

The size of the large diameter weld neck flange will be selected according to the specific pipe diameter and standard. Generally, this type of flange is suitable for larger pipes, such as NPS 26 to NPS 60 (nominal pipe diameters from 26 inches to 60 inches).


The pressure rating of large diameter weld neck flanges will vary depending on the application environment and pipeline characteristics. Typically, they are suitable for high pressure environments and pressure ratings may include ANSI 150, 300, 600, etc., or DIN PN10, PN16, etc.


International standards for large diameter weld neck flanges include ASME B16.47 Series A and ASME B16.47 Series B. Published by the American Society of Mechanical Engineers (ASME), these standards specify design, size, material, fabrication and testing requirements for flanges.


Large diameter weld neck flanges are widely used in the following fields:

1.Oil and natural gas industry: In oil refining, oil pipelines and other fields, it is necessary to connect large-diameter pipelines to withstand high temperature, high pressure and corrosive media.
2.Chemical industry: used in the piping system of chemical processing plants, dealing with various corrosive substances.
3.Energy industry: large pipeline systems in fields such as electric power and nuclear power require stable connections.
4.Infrastructure: large piping systems in the water and wastewater sector.


Support for large diameter pipes: suitable for connecting large diameter pipes and equipment, providing a stable connection.
Long Neck Design: The neck design helps reduce stress concentrations, providing better strength and reliability.
Suitable for high-pressure environments: Due to its design and manufacturing requirements, it is suitable for high-pressure environments and demanding applications.

Advantages and disadvantages:


1.Suitable for large diameter pipes, providing a stable connection.
2.Long neck design helps reduce stress concentration and improve connection reliability.
3.Suitable for environments with high pressure, high temperature and corrosive media.


1.Manufacturing and installation costs are high, especially for large size flanges.
2.Larger size flanges may require more space for installation.

In a word, large diameter butt welding neck flanges are suitable for large piping systems, especially in environments with high pressure, high temperature or corrosive media. When choosing to use, it is necessary to comprehensively consider factors such as pipeline characteristics, pressure requirements, material selection and engineering costs.

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    1.Professional manufactory.
    2.Trial orders are acceptable.
    3.Flexible and convenient logistic service.
    4.Competitive price.
    5.100% testing,ensuring the mechanical properties
    6.Professional testing.

    1.We can guarantee the best material according to related quotation.
    2.Testing is performed on each fitting before delivery.
    3.All packages are adapt for shipment .
    4. Material chemical composition is conformed with international standard and environment standard.

    A) How can I get more details about your products?
    You can send an email to our email address. We will provide catalogue and pictures of our products for your reference.We can also supply pipe fittings, bolt and nut, gaskets etc. We aim to be your piping system solution provider. 

    B) How can I get some samples?   
    If you need, we will offer you samples for free, but new customers are expected to pay express charge. 

    C) Do you provide customized parts? 
    Yes, you can give us drawings and we will manufacture accordingly. 

    D) To which country have you supplied your products?
    We have supplied to Thailand, China Taiwan, Vietnam, India, South Africa, Sudan, Peru , Brazil, Trinidad and Tobago, Kuwait, Qatar, Sri Lanka, Pakistan, Romania, France, Spain, Germany, Belgium, Ukraine etc. (Figures here only include our customers in latest 5 years.). 

    E) I can’t see the goods or touch the goods, how can I deal with the risk involved?  
    Our quality management system conforms to the requirement of ISO 9001:2015 verified by DNV. We are absolutely worth your trust. We can accept trial order to enhance mutual trust.

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