Ⅰ. Product Definition

Weco type wing hammer unions with butt-weld ends are the most widely used pipeline connectors in the petroleum industry. With their unique design and performance, they offer significant advantages in high-pressure pipeline connections, particularly suited for harsh conditions in oil & gas, chemical, and marine engineering. Developed using technology introduced from companies like FMC, some components are interchangeable with FMC Weco components of the same specification. The union body is forged from high-quality alloy steel (e.g., AISI 4130 75K), with forging, machining, and heat treatment processes strictly complying with standards such as API 6A, API 16C, and Q1.

Ⅱ. Product Characteristics

1. Sealing Reliability

Featuring metal-to-metal sealing or composite sealing structures (e.g., O-ring + metal ring), these unions are meticulously designed to withstand high-pressure pulses and intense vibrations. This ensures excellent sealing performance in all complex working conditions, fundamentally eliminating fluid leakage and providing a solid guarantee for pipeline system safety.

2. Operational Convenience

The three-wing nut design significantly improves operational efficiency, allowing quick manual assembly and disassembly with a wrench angle ≤60°. The self-locking trapezoidal thread prevents loosening without additional tools, maintaining long-term sealing and reducing operational and maintenance costs.

3. Visual Identification

• Color Coding System: Specific wing nut colors correspond to different pressure ratings (e.g., blue for FIG100 wing hammer unions, red for FIG2000) for rapid on-site identification.
• Clear Markings: Wing nuts are clearly engraved with specifications (e.g., 2"×1502) and pressure ratings (e.g., 6000 psi), enabling workers to quickly and accurately obtain critical product information even in poor lighting or complex environments, ensuring correct installation and use.

4. Part Interchangeability

Components with the same size, pressure rating, and model number are interchangeable, significantly advantageous for equipment maintenance and replacement. This feature not only shortens repair time and reduces downtime losses but also facilitates inventory management and minimizes unnecessary spare parts costs.

5. High-Quality Reliability

From rigorous raw material selection to sophisticated processing and precise heat treatment, every manufacturing step is meticulously controlled. Products undergo multiple strict inspections before delivery to ensure stable and reliable performance under extreme conditions such as high temperature, high pressure, and strong corrosion, providing users with long-lasting durability.

6. Tool-Free Maintenance Design

• Seal surfaces can be visually inspected without disassembling the entire structure. When worn, only the sealing ring needs to be replaced or the seal surface ground, reducing maintenance costs by 40% compared to flanges (e.g., single maintenance cost savings of approximately $300 for DN50, 10,000 psi flanges).
• Supports online pressure maintenance (with special tools), allowing seal replacement without full depressurization and minimizing downtime.

7. Global Universal Standards

Compliant with international standards such as API Spec 6A and ASME B16.34, these unions are compatible with mainstream domestic and international equipment (e.g., fracturing trucks, wellhead devices). No customized design is required, and the procurement cycle can be shortened to 1–2 weeks.

Ⅲ. Specification Parameters

• Nominal Pipe Size: 1–4 inches (some products cover 1–12 inches).
• Working Pressure: Cold working pressure typically ranges from 2000 psi to 20000 psi, with different models corresponding to specific pressure ratings (e.g., Figure 100: 1000 psi / 69 bar; Figure 2000: up to 20000 psi / 1380 bar).

End Connection Types:

• Butt Weld: Butt welding is preferred for both ends to form a gap-free integrated connection, avoiding stress concentration in threaded connections and improving vibration fatigue resistance by over 30%, ensuring stable performance in long-term vibration environments.
• Other Connections: API pipeline thread ends and other connection types are also available to meet specific project requirements.
• Models: Common models include Fig 100 wing hammer unions, Fig 200/206 wing hammer unions,  Fig 400 wing hammer unions,  Fig 602 wing hammer unions,  Fig 1002 wing hammer unions,  Fig 1502 wing hammer unions,  Fig 2202 wing hammer unions, etc.

Ⅳ. Application Fields

1. Oil & Gas Transportation: Provides reliable connections for long-distance oil and gas pipelines, ensuring smooth and efficient transportation while adapting to complex geographical conditions and high-pressure requirements.
2. Oilfield Operations: Connects manifolds and pipelines in critical oilfield operations such as cementing, fracturing, acidizing, and testing, operating stably under frequent pressure changes and harsh environments to support oilfield extraction.
3. Fluid Transmission: Widely used for transporting various fluids, including crude oil, acidic gases, mud, injection water, and choke/kill lines, preventing leakage and ensuring safe transmission through excellent sealing and pressure resistance.

Ⅴ. Installation and Maintenance Guidelines

1. Installation Specifications

• Ensure pipeline axis alignment before welding, with misalignment ≤1.5% of the pipe diameter.
• Use special fixtures to secure the union and avoid deformation caused by welding stress.
• Perform stress relief heat treatment (SR) after welding to eliminate residual welding stress.

2. Routine Maintenance

• Inspect three-wing nut thread wear after each operation (replace if thread height wear >20%).
• Regularly apply anti-seize compounds (e.g., molybdenum disulfide) to seal surfaces to prevent metal bonding.
• Conduct magnetic particle inspection (MT) quarterly in acidic gas environments to detect crack initiation.