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Industrial Pipe Reducers for Diameter Transition in Pressure Piping Systems

Industrial piping systems need smooth transitions between different pipe sizes to control fluid velocity and maintain pressure containment. Our industrial pipe reducers are made using hot or cold press forming or plate rolling and longitudinal welding. This keeps the wall thickness even and creates a gradual taper angle. Available in concentric and eccentric types across butt-weld and forged designs, these fittings connect directly into ASME and DIN piping networks for oil and gas, chemical plants, and power generation facilities.

Eccentric Weld Reducer
Structure Type: Eccentric design.
Wall Thickness Classes: SCH10–SCH160, XXS, GOST, DIN, etc.
Steel Concentric Reducer
Structure: Butt-Welding connection, concentric design.
Dimensions: Custom sizes availabl.
ASME Reducer
Structure：Forged construction.
Core Material: Carbon steel, stainless steel, alloy steel.
GOST Reducer
1.Execution Standard: GOST 17378
2.Type/Model: Concentric、Eccentric
3.Specification: φ21.3mm-1016mm
4.Connection Type: BW
Din Reducer
1.Wall Thickness:This product follows the DIN standard series,with thickness ranging from 1mm to 5mm and 3mm to 40mm,fully satisfying the pressure rating demands of diverse pipeline systems....
Stainless Steel Reducer
1. Brand and Origin:The brand of the product is HAIHAO and it is manufactured in China. The product meets the requirements of ASME B16. 9 GOST 17378 and DIN2616 standards.
2....

Product Types

Concentric Reducers:

Symmetrical conical shape with a common centerline, used in vertical piping runs or pump discharge lines where uniform flow symmetry is required.

Eccentric Reducers:

Asymmetrical design with an offset flat side, installed primarily in horizontal pump suction lines to prevent vapor pocket accumulation and cavitation.

Threaded and Socket-Weld Reducers:

Forged reducer inserts and bushings built for smaller utility lines, instrument connections, and auxiliary low-pressure piping.

Materials & Standards

01/

Stainless Steel: ASTM A403 WP304/304L, WP316/316L, WP321, WP310S. Resists rust and corrosion in chemical, pharmaceutical, and food-grade fluid transport.

02/

Carbon Steel: ASTM A234 WPB, WPC; ASTM A420 WPL6 for cold temperatures down to -46°C. Available in normalized and stress-relieved conditions.

03/

Alloy Steel & Special Alloys: ASTM A234 WP11, WP22, WP91; Duplex Stainless Steel UNS S31803 and S32750 for severe chemical and offshore environments.

04/

Dimensional Standards:
Butt-weld: ASME B16.9, MSS SP-43, ISO 3419, DIN 2616.

Forged, Threaded, and Socket-weld: ASME B16.11, BS 3799.

Wall Thickness Schedules: Sch 5S, Sch 10S, Sch 40, Sch 80, Sch 160, XXS.

Technical Specifications

Technical Parameter	Standard Specification
Size Range – Seamless Reducers	1/2 inch to 24 inch at the larger end
Size Range – Welded Reducers	26 inch to 60 inch and above
Wall Thickness Tolerance	In accordance with ASME B16.9, with wall thickness at both ends and throughout the tapered body meeting nominal schedule requirements
End Preparation	Beveled ends according to ASME B16.25, with matching root faces for multi-pass butt welding
Surface Finish – Stainless Steel	Pickled and passivated
Surface Finish – Carbon & Alloy Steel	Shot-blast cleaned with anti-rust black paint or clean protective oil coating

Applications

Pump Stations:

Installed at pump suction and discharge ports to transition pipe diameters without creating flow separation or cavitation.

Petrochemical Refineries:

Process column piping and multi-tier reactor headers handling corrosive hydrocarbons under thermal stress.

Oil & Gas Pipelines:

Main compressor and transmission headers shifting line sizes to regulate pressure drops.

Power Generation Plants:

Boiler feedwater systems and steam turbine connecting lines operating at high temperatures and pressures.

Manufacturing & QC

Forming Process: Hydraulic deep drawing and press forming done on heavy-duty dies to compress seamless pipe blanks or cold-formed plate cones, maintaining structural density without thinning faults.

Heat Treatment: Solution annealing for stainless steel grades; normalizing, quenching, and tempering for alloy and carbon steel reducers to relieve forming stresses.

Dimensional Inspection: 100 percent check of large end diameter, small end diameter, overall length, concentricity offset, and bevel squareness using laser tools and digital calipers.

Non-Destructive Testing: Radiographic testing (RT) on longitudinal seam welds, ultrasonic testing (UT) on thick walls, and positive material identification (PMI) spectrometer testing to check metal alloy grades.

Documentation: Material Test Reports (MTR) provided under EN 10204 3.1, detailing chemical composition, mechanical tensile properties, and heat numbers matched to each fitting.

Packaging & Delivery

Export Packaging:

Fumigation-free wooden crates, sturdy plywood boxes, or steel-banded wooden pallets lined with plastic moisture protection.

Protection Caps:

Plastic caps fitted on both ends of the reducer to stop impact damage, bevel distortion, and dirt entry during transit.

Logistics Support:

Container shipping (FCL and LCL) and air freight help with complete shipping documents, including commercial invoice, packing list, material test reports, certificate of origin, and bill of lading.

Customization & OEM

Asymmetric Transitions: Custom length-to-diameter ratios, non-standard transition angles, and special eccentric offset dimensions built to exact customer drawings.

Mismatched Schedule Transitions: Custom root faces and transition machining to join pipes with differing wall thicknesses, such as schedule 40 to schedule 160.

Third-Party Inspection: Welcome customer-appointed inspection companies like SGS, BV, TUV, or DNV for factory checks before shipment.

FAQ

Q: What is the difference between concentric and eccentric reducers, and when should each be used?

A: A concentric reducer has a symmetrical conical shape with a common centerline, making it ideal for vertical piping lines or pump discharge headers. An eccentric reducer has an offset flat side and is used primarily in horizontal pump suction lines to prevent air pockets or vapor accumulation that can cause pump cavitation.

Q: How do you handle reducers that connect pipes with different wall thickness schedules?

A: We machine the ends of the reducer to match the specific wall thickness of each connecting pipe. If a thick pipe connects to a thin pipe, we provide an internal or external transition slope following ASME B16.9 rules to ensure smooth root-pass welding and prevent flow turbulence.

Q: Can you supply reducers manufactured to NACE MR0175 for sour gas service?

A: Yes. For carbon and low-alloy steel reducers used in sour oil and gas environments, we source steel with strictly controlled limits for sulfur, phosphorus, and carbon. We perform post-weld heat treatment and hardness tests (maximum 248 HV10) to comply with NACE MR0175 and ISO 15156 standards.

Q: What documents come with each shipment of pipe reducers?

A: Every shipment includes a Material Test Report certified to EN 10204 3.1. The report lists chemical composition, tensile strength, yield strength, elongation, hardness values, heat treatment records, and non-destructive testing results matched to the heat number stamped on the fitting.

Q: Do you test all stainless steel and alloy reducers for material grade?

A: Yes. We perform 100 percent PMI testing using X-ray fluorescence analyzers on all stainless steel grades like 304 and 316, and special alloys like Duplex and Inconel, to verify the exact metal composition before packing.

Q: What end preparations are available for butt-weld reducers?

A: Standard butt-weld reducers come with beveled ends following ASME B16.25, using a 37.5 degree angle and a 1.6 mm root face. We also machine custom J-prep edges, compound bevels, or square cuts based on your welding procedure specifications.

Q: What is your standard lead time for standard and custom pipe reducers?

A: Stock items in common sizes like ASTM A234 WPB and ASTM A403 WP316 in schedule 40 and schedule 80 ship within 7 to 14 business days. Custom shapes, special alloy grades, or non-standard wall thicknesses take 25 to 40 days based on raw material availability and third-party inspection steps.

As one of the most professional reducer manufacturers and suppliers in China, we are able to meet the needs of the majority of our customers. Please rest assured to wholesale high quality reducer made in China here from our factory. For price consultation, contact us.

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