Forging Steel WYE Pieces | Custom Piggable Wyes Manufacturer From China
This page starts with a fast summary and keeps the full technical depth covering materials, geometry, applications, manufacturing capability, inspection scope, certification route, and buyer FAQ.
Quick Product Summary
If you need a short answer: Jiangsu Liangyi manufactures custom forging steel WYE pieces and piggable wyes for subsea oil & gas tie-ins, onshore transmission pipelines, petrochemical flow combiner systems, and other critical process lines. The page below keeps the full long-form technical detail, while this summary highlights the main facts most procurement teams want to review quickly.
On-Page Technical Navigation
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Key Specification Snapshot
Who This Page Is For
- Engineering teams comparing forged, cast, and fabricated solutions for piggable lateral tie-ins.
- Procurement teams needing a fast summary before requesting a formal quotation.
- Project owners and EPCs evaluating material suitability by region, service environment, and inspection package.
- Technical researchers looking for clear factual answers about geometry, standards, materials, manufacturing route, and documentation scope.
Product Overview: What Are Forging Steel WYE Pieces & Piggable Wyes?
As a professional ISO 9001:2015 certified open die forging manufacturer from China , Jiangsu Liangyi has been specialized in the custom production of high-performance forging steel WYE pieces and forged steel piggable wyes for over 25 years.And our products are used in extreme industrial conditions around the world.
Our forged steel piggable wye is a Y-shaped pipeline fitting, and it is used for facilitate seamless pigging, cleaning, inspection, and maintenance of lateral subsea and onshore pipeline systems that tie into main transmission lines. Unlike standard WYE fittings, our piggable wyes are machined to make sure pipeline pigs can pass through unobstructed. (intelligent, cleaning, and batching pigs), the pig or the fitting are not damaged , downtime is deleted and the pipeline maintenance costs is cut.
As a main flow combiner for pipeline tie-ins, our finished machined forging steel WYE piece has two piping inlets, each configured at an angle of 15 degrees from the centerline of the fitting, creating a 30-degree included angle of entry between the two inlets, which makes sure the fluid flow smoothly , pressure loss is lower, and pig can fully pass even in high-pressure, high-temperature, and harsh corrosive environments.
We offer a full range of custom manufacturing of forged piggable wyes, including steel melting, open die forging, heat treatment, and final CNC machining,and all parts are produced based on clients’ drawings and technical specifications.
Core Engineering Advantages of Our Forged Steel Piggable Wyes
Unlike cast or fabricated WYE fittings, our forging steel WYE pieces have great mechanical performance, integrity, so that they are the best choice materials for important pipeline projects around the world. Following are our main competitive advantages:
- Great Forged Structural Integrity: Produced via open die forging process, our piggable wyes have refined grain distribution, consistent material density, and no porosity or inclusions, and the tensile strength and fatigue resistance of them are 30% higher than these cast parts. Our piggable wyes are the best choice material for high-pressure cyclic loading applications.
- Piggability-Optimized Design: Our 15-degree centerline angle design is engineered as per API 6D pipeline pigging standards. The parts have smooth internal transitions, consistent bore diameter, and no sharp edges, making sure all types of pipeline pigs are 100% passable ,from foam cleaning pigs to intelligent inspection pigs.
- Full Custom Engineering Support: Our in-house engineering team can customize the wye angle, bore size, wall thickness, end connection (welded, flanged), and material grade to match clients project requirements, including sour service, low-temperature, and ultra-deepwater applications.
- Precision Machining Tolerance Control: Our piggable wyes are machined on advanced 5-axis CNC equipment.They have strict dimensional tolerances up to ±0.05mm, with internal surface roughness up to Ra 1.6μm, which make sure the pig wear is lower and all parts can work well for a long time.
- Full Material Traceability: Every forging steel WYE piece are traceable from the original steel billet to the finished product, with complete mill test reports (MTR) and EN 10204 3.1/3.2 certification.All parts meet the strictest project requirements.
Fast Technical Comparison for Specifiers
This summary table helps buyers understand why forged piggable wyes are usually selected for critical service, while the original long-form explanation remains intact below.
| Comparison Point | Forged Piggable Wye | Cast WYE Fitting | Fabricated WYE Fitting |
|---|---|---|---|
| Internal structure | Refined grain flow and dense forged structure | Higher porosity risk in critical service | Depends heavily on weld quality and fabrication route |
| Pig passability | Optimized for smooth bore transitions and pigging | Not normally the first choice for piggable critical tie-ins | Possible, but geometry consistency depends on fabrication control |
| Mechanical integrity | Preferred for high pressure, cyclic, and critical projects | Usually lower confidence for severe duty conditions | Project dependent; weld zones require extra control |
| Traceability and certification | Well-suited to full MTR, EN 10204, and third-party inspection packages | Available case by case | Available, but welding/NDT records become more extensive |
| Best-fit use case | Subsea, oil & gas, pipeline, petrochemical and severe service systems | Lower criticality or non-piggable applications | When fabrication route is accepted by project specification |
Full Range of Compliant Material Grades (By Application & Region)
We supply forged piggable wyes in a full range of international standard material grades, which meet ASTM, ASME, DIN, EN, API, and NACE standards. They can be customized based on the specific environmental conditions and regulatory requirements of your project region. Our material range covers:
Regional Compliance Mapping at a Glance
- North America: API 6A / API 6D, ASTM, ASME and NACE-focused project requirements for upstream and transmission pipeline systems.
- Europe: EN, DIN, PED, NORSOK, low-temperature impact performance and offshore certification emphasis.
- Middle East: Sour service readiness, Aramco / ADNOC engineering expectations, corrosion resistance and heavy-duty service reliability.
- Asia-Pacific: Cross-border pipeline, LNG, marine and process-plant compatibility with project-specific owner specifications.
- Australia & South America: Duplex and nickel alloy suitability for chloride-rich offshore and ultra-deepwater service conditions.
Alloy & Carbon Steel Grades (Global Onshore/Offshore Oil & Gas)
They are used for standard and high-pressure pipeline, and they are the best choice materials for onshore gathering systems, transmission pipelines, and non-sour service subsea projects across the Middle East, North America, and Asia Pacific:
A182-F5, A182-F11, A182-F12, A182-F21, A182-F22, ASTM A182-F22V, A182-F91, A182-F92, ASTM A694-F42, ASTM A694-F46, ASTM A694-F48, ASTM A694-F50, ASTM A694-F60, ASTM A694-F70, ASME SA516 Grade 60, SA516-Grade 70, SA-350 LF2, SA-350 LF3, SA-350 LF5, SA-350 LF6, A36, ASTM A105, ASME SA266 Grade 2/Grade 4, ST37.2, C22.8, S235JR, S275JR, S355JR, 12CrMo9-10, 18CrMoS4, 18CrNiMo7-6, 17CrNiMo6, 16MnCr5, St52-3, S355J2G3
Regional Application Note: SA-350 LF2 low-temperature carbon steel is the preferred grade for low-temperature projects in the North Sea (Europe), Canada, and Alaska, its resistance to impact is down to -46°C.ASTM A694 grades are mandatory for API 6A compliant projects in North America.
Stainless Steel & Duplex Steel Grades (Corrosive & Marine Applications)
They are used for moderate to highly corrosive environments, and they are the best choice material for petrochemical plants, LNG pipelines, and marine coastal projects across Europe, Australia, and Southeast Asia:
A182-F6a, A182-F6b, A182-F304, A182-F304L, A182-F310, A182-F316, A182-F316L, A182-F317, A182-F317L, A182-F347, AISI 309, AISI 310S, AISI 316Lmod, A182-F48, A182-F321, A182-F347, A182-F348, Nitronic 50, Nitronic 40, Nitronic 60, Nitronic 30, XM-11, XM-10, UNS S21800, Alloy 20, 904L, PH13-8Mo, 17-4PH, 15-5PH, 17-7PH, PH15-7 Mo, 254SMO, AL-6XN, 654SMO, A182-F44, A182-F45, A182-F51, A182-F53, A182-F60, A182-F55, A182-F62, A182-F52, ASTM A182-F61, UNS N08028, UNS N08367
Regional Application Note: Super duplex steel grades (F53, F55) are used for sour service and chloride-rich marine projects in Australia, Brazil, and the Gulf of Mexico; 904L and 254SMO super austenitic stainless steel is the standard for European chemical and petrochemical projects.
Nickel Alloy & Super Alloy Grades (Extreme Harsh Environments)
They are used for ultra-corrosive, high-temperature, high-pressure sour service (H2S/CO2) conditions, and they are the best choice material for deepwater subsea projects, acid gas gathering systems, and high-temperature process plants around the world:
Nickel 200, Nickel 201, Monel 400, Monel R-405, Monel K-500, Hastelloy C-22, Hastelloy X, Hastelloy C-4, Hastelloy B-2, Hastelloy C-276, Hastelloy C-2000, Hastelloy B, Nimonic 75, Nimonic 90, Nimonic 80A, Nimonic 105, Nimonic 901, Inconel 600, Inconel 601, Inconel 617, Inconel 625, Inconel 686, Inconel 690, Inconel 693, Inconel 718, Inconel 725, Inconel X-750, Incoloy 800, Incoloy 800H, Incoloy 800HT, Incoloy 825, Incoloy 926, Incoloy 925, Incoloy 901
Regional Application Note: Hastelloy and Inconel grades are mandatory for ultra-deepwater sour service projects in the Gulf of Mexico, Brazil pre-salt fields, and the Middle East high-sulfur oil & gas fields; all sour service materials meet NACE MR0175/ISO 15156 standards.
Explore our full range of forging material grades and custom material solutions for your project.
Global Industry Applications & Regional Project Cases
Our forging steel WYE pieces and piggable wyes are used in important industrial projects in more than 50 countries, and they work well in extreme conditions. Following are our main applications and region-specific project cases:
Deepwater Subsea Oil & Gas Field Tie-In Projects
Our forged steel piggable wyes are the main parts of subsea production systems. They are used to connect satellite well lateral pipelines to main oil and gas transmission lines, while make sure the pipeline is cleaned and and the lifetime is long. Our products are the best choice material for ultra-high hydrostatic pressure, corrosive seawater, and harsh subsea conditions.
Regional Proven Cases
- North America (Gulf of Mexico, USA): We provide the client over 120 units of piggable wyes for a 1500m ultra-deepwater tie-in project for a major US oil operator, with full ABS certification.All products are tested by NDT meet ASTM A694 F60.
- Europe (North Sea, Norway): We provide 85 units of forging steel WYE pieces for Equinor's 1200m deepwater gas field project, they can work well in low temperature down to -50°C and fully meet NORSOK standards.
- South America (Brazil Pre-Salt Fields): We provided custom Inconel 625 clad piggable wyes for Petrobras' 2200m ultra-deepwater project, with ABS certification. They all meet NACE MR0175 and can work well in high H2S/CO2 sour service conditions.
Offshore & Onshore Pipeline Pigging & Maintenance Systems
Our piggable wyes are installed at main lateral tie-in points along long-distance transmission pipelines, making sure the operations of seamless pigging, cleaning, and intelligent inspection can be done without shutting down production. This reduces maintenance costs, minimizes downtime.
Regional Proven Cases
- Middle East (UAE, Saudi Arabia): We provide more than 500 units of carbon steel and alloy steel piggable wyes for ADNOC and Saudi Aramco's onshore oil and gas gathering pipeline networks.They all meet NACE MR0175 and Aramco engineering standards.And they are used for high-sulfur crude oil service .
- Asia Pacific (China, Southeast Asia): We provide 320 units of ASTM A105 and 316L stainless steel forging steel WYE pieces for the China-Russia East Route Natural Gas Pipeline and Southeast Asia cross-border gas transmission projects, with full CNPC and Petronas certification.
- Oceania (Australia): We provided super duplex steel F53 piggable wyes for the North West Shelf LNG project in Western Australia.They all meet ASME and Australian pipeline standards, and are used for chloride-rich coastal marine environments .
Petrochemical & Refinery Flow Combiner Systems
Our forging steel WYE pieces are important parts of high-pressure process piping systems in refineries and petrochemical plants, they are used to merge multiple process fluid streams into a single transmission line, while supporting regular pigging operations to remove scale, polymer deposits, and debris. Our products are used for high temperatures, high pressures, and aggressive chemical corrosion.
Regional Proven Cases
- Europe (Germany, Netherlands): We provide custom 316L and Hastelloy C276 piggable wyes for BASF and Shell's European refinery and petrochemical complexes, they all meet PED 2014/68/EU and AD 2000 pressure equipment standards.
- North America (United States): We provide Alloy 20 and 904L stainless steel forging steel WYE pieces for a major US Gulf Coast refinery expansion project, they all meet ASME B31.3 process piping standards.
Other Critical Industrial Applications
Our forged piggable wyes are also used in the following other extreme conditions:
- CO2 sequestration and carbon capture, utilization, and storage (CCUS) pipeline systems (North America, Europe)
- Mining slurry and dewatering pipeline systems (Australia, South America, Africa)
- Thermal power plant and nuclear power plant cooling water pipeline systems (Asia, Europe)
- Marine shipbuilding and offshore platform piping systems (Worldwide)
View more of our global project references and industry success cases.
End-to-End Custom Manufacturing Capabilities
With over 25 years of open die forging experience, we provide a full range of service for custom forging steel WYE pieces, from raw material melting to final inspection and delivery. Our factory covers an area of 80,000㎡ and has an annual manufacturing capacity of 120,000 tons.We can produce forged piggable wyes that weight from 30KGS to 30,000KGS per single-piece.
Following are our main manufacturing capabilities :
- In-House Steel Melting: We have 30t electric arc furnace (EAF), 30t ladle refining furnace (LF), VOD vacuum degassing furnace, and medium frequency induction furnaces, making sure the chemical composition and purity of materials are fully controlled.
- Open Die Forging: We have 2000T, 4000T, and 6300T hydraulic forging presses, and 3T and 5T electro-hydraulic forging hammers, so we can forge piggable wyes in all sizes and shapes with consistent grain refinement.
- Precision Heat Treatment: We have 10 fully automatic heat treatment furnaces which can carry out normalizing, quenching, tempering, annealing, and solution treatment,so that our products have great mechanical properties to meet clients requirements.
- Advanced Precision Machining: We have advanced CNC machining centers, 5-axis milling machines and boring machines, making sure our custom piggable wyes have accurate dimensions and great surface finish.
Learn more about our advanced forging and machining equipment and production capabilities.
Rigorous Quality Control & Global Certification Compliance
We have a strict ISO 9001:2015 certified quality management system, and we check every forging steel WYE piece to make sure our delivery of products have no defects. Third-party inspection and certification are also available based on clients requirements.
Comprehensive Testing & Inspection Procedures
We check every batch of our forged piggable wyes with the following testing methods, which fully meet international standards:
- Visual Inspections (Direct and Indirect, compliant with ASTM A961)
- Magnetic Particle Testing (MT, compliant with ASTM E165)
- Dye Penetrant Testing (PT, Visible and Fluorescent, compliant with ASTM E1417)
- Ultra-sonic Testing (UT, compliant with ASTM A388)
- Radiographic Testing (RT, compliant with ASTM E94)
- Metallurgical Testing (Macro & Micro Analysis, Grain Size Determination, compliant with ASTM E112)
- Charpy Impact Testing (V Notch Charpy, compliant with ASTM E23)
- Hardness Testing (Including Micro and Macro Vickers Tests, compliant with ASTM E92)
- Tensile Testing (compliant with ASTM A370)
- Chemical Composition Analysis (Spectrometer Analysis)
- Dimensional & Size Inspection (Full 3D CMM Measurement)
Global Certification & Regulatory Compliance
Our forged piggable are provided with EN 10204 3.1 or 3.2 mill test certificates, as well as third-party inspection and certification from global authoritative bodies, such as DNV-GL, Bureau Veritas, Lloyd's Register, ABS, RINA and TÜV. Our products fully meet the following international standards and regional regulations:
- ASTM, ASME, API 6A, API 6D (North America, Global)
- DIN, EN, PED 2014/68/EU, NORSOK (Europe)
- ADNOC, Saudi Aramco Engineering Standards (Middle East)
- ASME, AS (Australia, New Zealand)
- JIS (Japan, Korea)
- NACE MR0175/ISO 15156 (Sour Service Applications, Global)
Frequently Asked Questions (FAQs) About Piggable Wyes
A piggable wye is a Y-shaped pipeline fitting which makes sure that pigs (cleaning, inspection, or batching pigs) can pass through unobstructed. They are different from standard WYE fittings. The standard WYE fittingswhich typically have a 45-degree or 90-degree angle and sharp internal transitions ,which can damage pigs or block passage. But piggable wyes have a shallow 15-degree per leg angle (30-degree included angle) and smooth internal bores, making sure the pig can pass smoothly . So that they are the best choice material for pipeline systems that needs regular pigging and maintenance.
The industry standard for piggable wyes is a 15-degree angle from the centerline for each inlet leg, creating a 30-degree included angle between the two inlets, which meet API 6D pipeline standards . So that they can make sure pig passes more smoothly, pressure loss is lower and fluid flow is smooth. We can also customize the angle based on clients requirements, such as 22.5-degree or 45-degree angles for special applications.
We supply forged steel WYE pieces in a full range of material grades, including carbon steel (ASTM A105, SA516 Grade 70), alloy steel (A182 F11, F22, A694 F60), stainless steel (304, 316L, 310S), duplex and super duplex steel (F51, F53, F55), nickel alloy (Inconel, Hastelloy, Monel, Incoloy), and super alloys. All materials meet international ASTM, ASME, DIN, EN, and API standards. And our products are used for sour service, low-temperature, and high-corrosion conditions.
Yes, we produce piggable wyes and forging steel WYE pieces based on clients engineering drawings and technical specifications. Our in-house engineering team will review your drawings, provide DFM (Design for Manufacturability) feedback, and deliver a finished product that meets your dimensional, material, and performance requirements. We support custom sizes, wall thicknesses, end connections, and material grades for your unique project needs.
Our factory is ISO 9001:2015 certified, and all our forging steel WYE pieces meet the standard of EN 10204 3.1 mill test certificates.We also support EN 10204 3.2 certificates with third-party inspection from DNV-GL, Bureau Veritas, Lloyd's Register, ABS, RINA, and TÜV. All of our products meet API 6A, API 6D, ASME, ASTM, DIN, EN, and NACE MR0175 standards ,as well as the requirements of global oil and gas and pipeline projects.
They are used in subsea oil and gas field tie-ins, onshore transmission pipelines, petrochemical and refinery flow combiner systems, LNG and marine projects, CCUS pipelines, mining slurry systems, and selected thermal or nuclear plant water systems where structural reliability and pig passability are both important.
We can support a full inspection package including visual inspection, PT, MT, UT, RT, chemical analysis, tensile testing, hardness testing, Charpy impact testing, metallurgical analysis, and dimensional test based on clients drawing, project specification, and third-party witness requirements.
Please send us your engineering drawing, material grade, service condition, required standards, NDT and certification scope, quantity, requested delivery date, and destination market. With these details, our engineering and sales team will provide a faster, more accurate quotation.
What To Send For a Faster and More Accurate Quotation
In order to get a faster quotation, please send us the following information:
- Engineering drawing or GA drawing with main dimensions, branch angle, wall thickness, bore and end details.
- Material grade requirement such as ASTM A105, A694, F51, F55, Inconel, Hastelloy or other project-specified alloy.
- Applicable standard and project code such as API 6D, ASME, ASTM, NACE MR0175, PED or owner specification.
- Service condition including pressure, temperature, medium, sour service requirement, and corrosion environment.
- Inspection and documentation scope such as UT, RT, PT, MT, Charpy, hardness, EN 10204 3.1 or 3.2, and third-party witness inspection.
- Quantity, delivery schedule and destination market so that production planning and export documentation can be aligned early.
Contact Us For Custom Forging Steel WYE Pieces Quotation
Jiangsu Liangyi is your trusted China manufacturer, we provide clients forging steel WYE pieces and custom piggable wyes with high quality and competitive price from USD 2/kg. We have served clients in the oil and gas, pipeline, petrochemical, and marine industries around the world.
Welcome to send your custom engineering drawing, material requirement, order quantity, and project specifications to us for a detailed and fast quotation! Our sales team will respond to you within 24 hours.
Direct Contact Details
📧 Inquiry Email: [email protected]📞 Phone/WhatsApp: +86-13585067993
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📍 Address: Chengchang Industry Park, Jiangyin City, Jiangsu Province, China