ASME B16.9 ASTM A234 WP5-S CL1 / CL3 Ecc. Reducer Alloy Steel Pipe Fittings​

A buttweld reducer is a type of pipe fitting used to connect two pipes of different diameters. Unlike other types of reducers (e.g., socket weld or threaded reducers), buttweld reducers are designed to be welded directly to the pipes, providing a seamless connection. This makes them ideal for high-pressure and high-temperature applications. Buttweld reducers are typically made from materials like carbon steel, stainless steel, alloy steel, and sometimes even non-ferrous materials like brass or bronze. The choice of material depends on the application, including factors like temperature, pressure, and corrosion resistance.

Types of Buttweld Reducers

• Concentric Reducers: These reducers have a symmetrical shape, with the centerline of the smaller end aligned with the centerline of the larger end. They are commonly used in horizontal pipelines where maintaining the same elevation is important.
• Eccentric Reducers: These reducers have an offset centerline, meaning the smaller end is offset from the centerline of the larger end. They are often used in vertical pipelines or when it is necessary to maintain a level fluid surface (e.g., in drainage systems).

ASTM A234 WP5 Alloy Steel Pipe Fittings Chemical Requirements

ASTM A234 WP5 Alloy Steel Pipe Fittings Pressure and Temperature Ratings

Note: Fittings of Grades WP1, WP11 Class 1, WP11 Class 2, WP11 Class 3, WP12 Class 1, WP12 Class 2, WP22 Class 1, WP22 Class 3, WP5, and WP9 shall be furnished in the annealed, isothermal-annealed, or normalized and tempered

Applications

• Power Generation: Used in boiler systems, steam lines, and other high-temperature, high-pressure applications.
• Oil and Gas Industry: Used in pipelines for transporting oil, natural gas, and other hydrocarbons.
• Chemical Processing: Suitable for systems handling corrosive chemicals, where high strength and durability are required.
• Water Treatment and Distribution: Used in municipal water systems and wastewater treatment plants.

Installation and Maintenance

• Welding: Buttweld reducers are designed to be welded directly to pipes. Proper welding techniques and procedures must be followed to ensure a strong and leak-free connection.
• Alignment: Proper alignment is crucial to avoid stress concentrations and ensure smooth flow.
• Inspection: Regular inspection and maintenance are necessary to detect and address any potential issues, such as corrosion or cracks.