Pipe Fittings Manufacturer for EPC, Power Plant & Piping Projects

✅ Professional Pipe Fittings Manufacturer in China
We are a professional manufacturer of pipe fittings for EPC projects, power plants, petrochemical, oil & gas, water treatment, shipbuilding, and industrial piping systems. Pipe fittings are components used to connect, terminate, control flow, or change the direction and diameter of piping runs. Our product portfolio includes butt weld elbows (90° long radius, 90° short radius, 45°, 180° return), equal and reducing tees, concentric and eccentric reducers, caps, crosses, and stub ends, manufactured in carbon steel, stainless steel, duplex stainless steel, alloy steel, and nickel alloys. All products comply with ASME B16.9, ASME B16.28, ASTM A234, ASTM A403, and EN 10253 standards, available in sizes NPS 1/2 to NPS 48 and wall thicknesses matching SCH 5S through SCH XXS.

📋 Product Overview & Key Features

Pipe fittings are the critical connection points in any piping system. They must match the pipe specification, pressure class, material, and welding procedure to ensure system integrity. Our pipe fittings are manufactured from seamless pipe or plate, heat-treated, and dimensionally inspected to meet ASME B16.9 and B16.28 requirements. Key features include:

📦 Pipe Fitting Types & Applications

📋 Technical Specification

* Custom dimensions, materials, and wall thicknesses are available upon request for EPC project tenders.

📊 Pipe Fitting Material Selection Guide

❓ Frequently Asked Questions (FAQ)

Q1: What are pipe fittings?
A: Pipe fittings are components used to connect, terminate, control flow, or change the direction and diameter of piping runs. Common types include elbows, tees, reducers, caps, crosses, and stub ends. They are essential for assembling a complete piping system and must match the pipe specification, pressure class, and material.

Q2: What are the main types of pipe fittings?
A: The main types include: Elbows — change flow direction (90° LR/SR, 45°, 180° return); Tees — branch flow (equal and reducing); Reducers — change pipe diameter (concentric and eccentric); Caps — seal pipe ends; Crosses — four-way branch; and Stub ends — for lap joint flange connections.

Q3: What is the difference between a long radius (LR) and short radius (SR) elbow?
A: A long radius (LR) elbow has a centerline radius of 1.5 × NPS, providing a gentler flow path with lower pressure drop — the standard choice for most piping. A short radius (SR) elbow has a radius of 1.0 × NPS, requiring less space but causing higher pressure drop and turbulence. SR elbows are specified to ASME B16.28, while LR elbows are covered by ASME B16.9.

Q4: What standards do your pipe fittings comply with?
A: Our butt weld fittings comply with ASME B16.9 (long radius elbows, tees, reducers, caps, crosses, stub ends) and ASME B16.28 (short radius elbows and returns). Material specifications include ASTM A234 (carbon steel), ASTM A403 (stainless steel), ASTM A420 (low-temperature), and ASTM A815 (duplex).

Q5: What size range do you offer?
A: ASME B16.9 / B16.28: NPS 1/2 to NPS 48 (DN 15 to DN 1200). Seamless fittings are typically available up to NPS 24; welded fittings are available up to NPS 48 and beyond upon request.

Q6: What wall thicknesses are available?
A: Wall thickness matches the connecting pipe schedule: SCH 5S, 10S, 20S, STD, 40S, XS, 80S, 100, 120, 140, 160, and XXS. The pressure rating of a butt weld fitting is the same as the pipe of equivalent size, schedule, and material.

Q7: What materials are used for pipe fittings?
A: Carbon steel: ASTM A234 WPB, WPC; A420 WPL6 (low-temp). Stainless steel: A403 WP304/304L, WP316/316L, WP321, WP347. Duplex: A815 S31803 (2205), S32750 (2507). Alloy steel: A234 WP11, WP22, WP91. Nickel alloys: Inconel, Incoloy, Monel.

Q8: What is the difference between A234 WPB and A403 WP304?
A: A234 WPB is a carbon steel fitting specification for general non-corrosive service. A403 WP304 is an austenitic stainless steel specification for corrosive service. WPB is economical and widely used; WP304 offers corrosion resistance but at higher cost and with different welding requirements.

Q9: What is the difference between a concentric and eccentric reducer?
A: A concentric reducer has both ends on the same centerline, used for vertical lines or where air pockets are not a concern. An eccentric reducer has one flat side, used on horizontal lines to prevent liquid trapping (flat bottom) or air pockets (flat top), and for pump suction lines.

Q10: When should I use a reducing tee vs a reducer?
A: A reducing tee is used when branching a smaller line off a larger main run at 90°. A reducer is used to change the pipe diameter along a straight run. If you need a branch, use a tee; if you need a size transition in-line, use a reducer.

Q11: What is the difference between a cap and a plug?
A: A cap is a butt weld fitting that slips over the pipe end and is welded, providing a permanent seal. A plug is typically a threaded or socket weld fitting that fits inside a fitting or valve body. Caps are specified to ASME B16.9; plugs are often covered by ASME B16.11.

Q12: What is a stub end used for?
A: A stub end is butt-welded to the pipe and used with a lap joint flange. The flange can rotate freely for easy bolt alignment, and because the flange does not contact the process fluid, it can be made from a less expensive material (e.g., carbon steel) while the stub end and pipe are stainless steel.

Q13: What is the difference between ASME B16.9 and ASME B16.11 fittings?
A: ASME B16.9 covers butt weld fittings (elbows, tees, reducers, caps) for NPS 1/2 to NPS 48, producing full-penetration welds that can be radiographed. ASME B16.11 covers forged socket weld and threaded fittings for small-bore piping (NPS 1/8 to NPS 4), using fillet welds that cannot be radiographed. B16.9 is preferred for critical service and larger sizes.

Q14: Can pipe fittings be used in high-pressure service?
A: Yes. Butt weld fittings inherit the pressure rating of the matching pipe schedule and material. For high-pressure service, specify the appropriate heavy wall schedule (SCH 80, 160, XXS) and material. Socket weld and threaded fittings (B16.11) are rated by class (2000, 3000, 6000, 9000) and are suitable for high pressure in small-bore sizes.

Q15: What welding preparation is required for butt weld fittings?
A: Butt weld fittings are supplied with beveled ends per ASME B16.25. The welder must follow the qualified Welding Procedure Specification (WPS) and perform the weld per the applicable code (ASME B31.1, B31.3, etc.). Full-penetration welds are typically inspected by radiography (RT) or ultrasonic testing (UT) for critical service.

Q16: What certificates are provided with your pipe fittings?
A: Standard: EN 10204 3.1 mill test certificates. Additional services: PMI (Positive Material Identification) , hardness testing, dimensional inspection, RT/UT/PT/MT NDT, and full heat number traceability.

Q17: What is the difference between seamless and welded pipe fittings?
A: Seamless fittings are formed from seamless pipe with no longitudinal weld, offering higher integrity and uniformity — preferred for critical and high-pressure service. Welded fittings are formed from plate and welded; they are more economical for large sizes (typically above NPS 24) where seamless pipe is not readily available.

Q18: What are the typical applications of pipe fittings in EPC projects?
A: Power plants — steam and water piping, boiler connections; Petrochemical — process piping, reactor connections; Oil & gas — wellhead, pipeline, and refinery piping; Water treatment — pump and valve connections; Shipbuilding — marine piping systems.

Q19: Do you support EPC projects with technical documentation?
A: Yes. We provide datasheets, dimension drawings, material certificates, NDT reports, and full traceability documentation for EPC project compliance. Our engineering team can review your piping specifications and recommend the optimal fitting solution.

Q20: Can you provide custom pipe fitting configurations?
A: Yes. We offer custom sizes, materials, wall thicknesses, fitting types, and special dimensions to meet project-specific requirements. Our engineering team works closely with EPC contractors to develop fittings that match specific piping classes, welding procedures, and service conditions.

📩 Contact Us for EPC Project Pricing & Technical Support

Send your piping specification, fitting schedule, or material requirements. Our engineering team will reply with a customized BOM, datasheet & material certificates within 24 hours.

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WhatsApp / Zalo: +86 17856068126  |  Email: [email protected]