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Reducer
SDFL
The GB/T 12459 DN 50×32 Sch10S concentric reducer is a butt-weld pipe fitting used for diameter transition in vertical pipeline systems. It maintains consistent center lines between large and small diameter pipelines, supporting smooth diameter change with low flow resistance, and is suitable for commercial procurement in industrial fluid transmission projects. This reducer matches Sch10S wall thickness pipelines at both ends.
This concentric reducer is manufactured in compliance with GB/T 12459, ASME B16.9, EN 10253-2, JIS B2312 and ISO 5251 standards. All dimensional parameters, end bevel preparation and wall thickness deviation meet the tolerance requirements of the above standards, ensuring interchangeability with standard pipelines and fittings of corresponding specifications. The GB/T 12459 compliance covers all structural and performance requirements specified for butt-weld steel reducers.
Multiple stainless steel and alloy material options are available to adapt to different working environments:
ASTM A403 WP304L: Suitable for general water, gas and weak corrosive medium pipelines
ASTM A403 WP316L: For scenarios with higher corrosion resistance requirements such as chloride-containing media
ASTM A815 UNS S31803: Duplex stainless steel for scenarios requiring both strength and corrosion resistance
UNS S31254 (254 SMO): For highly corrosive industrial media such as seawater and chemical solutions
UNS N06625 (Inconel 625): For high-temperature and strong corrosion working conditions
The reducer adopts a cone angle of 15° or less for smooth diameter transition. Tested with clean water at 20°C and flow velocity of 2.5 m/s, this design suppresses 85% of flow turbulence compared with standard 30° cone angle reducers. This feature helps maintain laminar flow state in process pipelines, reducing energy loss and medium shear.
The wall thickness transition zone of the reducer is optimized through finite element analysis (FEA), which reduces stress concentration during pressure and temperature changes. Compared with standard uniform wall thickness design, this optimized structure increases thermal cycle fatigue life by 40% under 20°C to 100°C temperature cycle conditions, extending the service life of the fitting in fluctuating working conditions.
The reducer adopts laser alignment control during production, with concentricity controlled within 0.5% of the small end outer diameter, measured in accordance with ASME B16.9 standard requirements. High concentricity ensures consistent alignment of pipeline center lines after installation, reducing additional stress on connected equipment and pipeline components.
This concentric reducer is suitable for multiple industrial scenarios, with typical applications including:
Vertical process pipelines: Used for diameter transition in vertical industrial pipelines, maintaining center line consistency and reducing pipeline support complexity.
Low-pressure steam pipe networks: Used for diameter reduction in low-pressure steam branch pipelines, suppressing flow noise and vibration caused by diameter change under rated pressure conditions.
Bioreactor vertical pipelines: Used for culture medium transmission lines in biopharmaceutical processes, with 316L sanitary grade material to maintain laminar flow and reduce medium residue.
Concentric reducers are suitable for vertical pipeline diameter transition. For horizontal pipelines, especially pump inlet pipelines, eccentric reducers are recommended to avoid cavitation and air accumulation. Users should select the type according to pipeline layout and process requirements. Sch10S wall thickness is suitable for low to medium pressure working conditions.
Both ends of the reducer adopt standard bevel preparation for butt welding. Before installation, confirm that the outer diameter and wall thickness of the connected pipelines match the reducer. During welding, symmetric welding sequence is recommended to control deformation and ensure pipeline coaxiality after installation.
For horizontally installed centrifugal pump inlets, eccentric reducers (top flat type) are recommended to prevent cavitation. This concentric reducer is applicable for vertically installed pump inlet and outlet pipelines.
The allowable working pressure varies with material and working temperature. For 304L material at room temperature, the static allowable working pressure is within 60 bar. Specific data can be provided based on actual working conditions.
Yes, all dimensional parameters and tolerance indicators of this concentric reducer fully comply with the requirements specified in GB/T 12459, and also meet corresponding international standard requirements.
The reducer should be selected according to the outside diameters and wall thicknesses of the larger and smaller pipes. The applicable dimensional standard, material grade, operating pressure and flow direction should also be confirmed before ordering.
Yes. Concentric reducers with special diameter combinations, wall thicknesses or overall lengths can be manufactured according to customer drawings. Technical confirmation is required before production to ensure that the reducer fits the connected piping system.
Yes. Reducers can be produced according to the specified GB, ASME, EN or other applicable piping standards. The selected standard should remain consistent with the connected pipes, flanges and valves to avoid dimensional mismatches.
Yes. Material certificates and inspection reports can be supplied with the reducer. Material grade and key dimensional items can be verified before shipment according to the agreed technical requirements.
