In the pipe fittings industry, various certifications and standards ensure the quality, performance, and safety of the products. Here are some commonly recognized certifications and standards in the pipe fittings industry:

ASTM Standards: The American Society for Testing and Materials (ASTM) has developed numerous standards for pipe fittings, including materials, dimensions, testing procedures, and performance requirements. These standards ensure consistency and quality in the manufacturing and use of pipe fittings. ASTM A105, ASTM A234, ATTM F442 and ASTM A403 are examples of standards for various types of pipe fittings.

ANSI/ASME B16 Standards: Developed by the American National Standards Institute (ANSI) and the American Society of Mechanical Engineers (ASME), the B16 series of standards cover dimensions, materials, pressure ratings, and design considerations for pipe fittings such as flanges, valves, elbows, tees, and reducers.

The American National Standards Institute (ANSI) establishes standards for pipe fittings to ensure compatibility, interchangeability, and safety. ANSI B16 standards are widely followed for dimensions, tolerances, materials, and testing requirements of pipe fittings.

ASME B16 series of standards covers dimensions, materials, and pressure ratings for various types of pipe fittings, flanges, and valves.

ISO Standards: The International Organization for Standardization (ISO) develops globally recognized standards for various industries, including pipe fittings. ISO standards cover aspects such as dimensions, materials, testing, and quality management systems to ensure product conformity and performance. ISO 4144 and ISO 49 provide specifications for threaded fittings, while ISO 5251 and ISO 3419 cover dimensions and materials for butt-welded fittings

DIN Standards: The Deutsches Institut für Normung (DIN) has developed standards for pipe fittings in Germany.and DIN 2576 provides specifications for plate flanges.

DIN 2605: This standard covers the dimensions and tolerances of steel butt-welding pipe fittings. It specifies requirements for elbows and bends with a range of angles and radii.

DIN 2615: This standard provides specifications for steel butt-welding pipe fittings, including reducers and tees. It specifies the dimensions, tolerances, and material requirements for these fittings.

DIN 2576 specifies the dimensions and technical requirements for flat flanges with a raised face (RF) or a flat face (FF). These flanges are commonly used in pipeline systems to connect pipes, valves, and other equipment.

DIN 2616: This standard covers steel butt-welding pipe fittings, including concentric and eccentric reducers. It specifies the dimensions, tolerances, and materials for these fittings used in pipelines.

DIN 2617: This standard provides guidelines for steel butt-welding pipe fittings, specifically end caps. It specifies the dimensions, tolerances, and materials for end caps used to seal the ends of pipes.

DIN 86029: This standard covers threaded couplings for steel pipes. It specifies the dimensions, tolerances, and thread types for these couplings used in piping systems.

DIN 86030: This standard provides specifications for threaded fittings with parallel internal threads for steel pipes. It covers fittings such as elbows, tees, and unions, specifying dimensions, tolerances, and thread types.

JIS Standards: The Japanese Industrial Standards (JIS) define requirements for pipe fittings used in Japan.

JIS B2311: This standard specifies the dimensions of butt-welding pipe fittings for general use. It covers elbows, tees, and reducers made of carbon steel and alloy steel.

JIS B2312: This standard provides specifications for steel butt-welding pipe fittings. It covers elbows and tees made of carbon steel, alloy steel, and stainless steel.

JIS B2313: This standard specifies the dimensions of butt-welding pipe fittings for pressure purposes. It covers elbows and tees made of carbon steel, alloy steel, and stainless steel.

JIS B2316: This standard covers steel socket-welding pipe fittings. It provides dimensions and specifications for socket-welding elbows and tees made of carbon steel, alloy steel, and stainless steel.

JIS B2220: This standard specifies the dimensions, tolerances, and materials for steel pipe flanges. It covers slip-on flanges, blind flanges, weld neck flanges, socket-welding flanges, and threaded flanges.

JIS B2301: This standard provides specifications for screw pipe fittings for general use. It covers fittings such as elbows, tees, crosses, and caps made of malleable cast iron or cast copper alloy.

JIS B2316: This standard specifies the dimensions and materials for steel socket-welding pipe fittings. It covers socket-welding elbows and tees made of carbon steel, alloy steel, and stainless steel.

EN Standards: The European Committee for Standardization (CEN) has developed EN standards that define requirements for pipe fittings in Europe. EN 10253 and EN 10242 are examples of standards for various types of fittings used in pressure applications.

EN 10253: This standard covers the design and dimensions of butt-welding pipe fittings made of carbon steel and alloy steel. It includes specifications for elbows, tees, reducers, caps, and other fittings.

EN 10255: This standard specifies the requirements for threaded steel tubes and screwed fittings. It covers both medium and heavy series steel tubes and threaded fittings used for water and other non-aggressive fluids.

EN 10241: This standard specifies requirements for non-alloy steel threaded fittings. It covers threaded fittings such as sockets, bends, tees, unions, and bushings used in general applications.

EN 10242: This standard specifies the requirements for threaded pipe fittings made of malleable cast iron. This standard covers a range of fittings used in various applications, particularly in plumbing and piping systems.

EN 1092: This standard provides specifications for flanges and their joints. It covers various types of flanges, including weld neck, slip-on, threaded, and blind flanges, with different pressure ratings and dimensions.

EN 12201: This standard covers pipe fittings for water supply and irrigation systems. It includes specifications for fittings such as bends, tees, reducers, and end caps made of thermoplastics, including polyethylene (PE) and polypropylene (PP).

EN 1555: This standard provides specifications for buried polyethylene (PE) pipe systems for gas supply. It covers fittings such as bends, tees, reducers, and end caps used in gas distribution networks.

EN 1254: This standard specifies copper and copper alloy fittings for plumbing applications. It covers fittings such as elbows, tees, couplings, and adapters used in hot and cold water supply systems.

MSS Standards: The Manufacturers Standardization Society of the Valve and Fittings Industry (MSS) provides a range of standards for pipe fittings. MSS SP-44 covers steel pipeline flanges, MSS SP-75 provides specifications for high-strength, low-alloy steel fittings, and MSS SP-97 covers integrally reinforced forged branch outlet fittings.

API Certifications: The American Petroleum Institute (API) offers certifications for pipe fittings used in the oil and gas industry. The API standards specify requirements for design, materials, manufacturing, and testing to ensure reliability, safety, and environmental protection. API 6A provides specifications for wellhead and Christmas tree equipment, while API 602 covers compact steel gate valves

NSF Certifications: The NSF International provides certifications for pipe fittings used in potable water systems. The NSF/ANSI 61 standard evaluates the safety and quality of materials in contact with drinking water, including pipe fittings, to ensure they meet health and regulatory requirements.

DVGW Certifications: In Germany, the German Technical and Scientific Association for Gas and Water (DVGW) provides certifications for pipe fittings used in gas and water supply systems. The DVGW certifications ensure compliance with safety, performance, and quality standards.

WRAS Approvals: In the United Kingdom, the Water Regulations Advisory Scheme (WRAS) offers approvals for pipe fittings used in public water supply systems. WRAS approvals verify that the materials and fittings comply with water supply regulations and do not cause water contamination.

CE Marking: The CE marking is a mandatory conformity mark for products sold within the European Economic Area (EEA). It demonstrates that the product complies with applicable EU directives, including those related to pressure equipment and construction products.

UPC: The UPC (Uniform Plumbing Code) is a set of standards and regulations that govern the design, installation, and inspection of plumbing systems in the United States. The UPC is published by the International Association of Plumbing and Mechanical Officials (IAPMO). While the UPC primarily focuses on plumbing systems as a whole, it also includes standards for pipe fittings.

In the context of pipe fittings, the UPC provides requirements for their material, dimensions, construction, and performance. These standards help ensure that pipe fittings used in plumbing systems meet specific criteria for compatibility, durability, and functionality.

ABS (American Bureau of Shipping) Certification: ABS provides certification for pipe fittings used in the marine and offshore industries. It ensures compliance with ABS rules and standards for materials, design, and manufacturing processes.

DNV (Det Norske Veritas) Certification: DNV certification is relevant for pipe fittings used in the maritime, offshore, and oil and gas sectors. It indicates compliance with DNV rules and requirements for quality, safety, and environmental considerations.

These are just a few examples of certifications and standards in the pipe fittings industry. It's important to check with specific manufacturers, industry organizations, or regulatory bodies to identify the relevant certifications and standards applicable to your specific project or geographical location.