​​ASME VIII Certified Gr.70N Tubesheet (Normalized) 100% UT/PT Inspection for LNG Heat Exchangers

Yuhong Holding Group Co., Ltd is a globally recognized manufacturer and supplier of industrial equipment, specializing in heat exchangers, fired heaters, air coolers, and other related components. With decades of expertise, advanced manufacturing facilities, and a commitment to quality, we provide premium products that meet the requirements of diverse industries. One of our flagship offerings is the SA516 Gr.70N Carbon Steel Tubesheet, designed for use in heat exchangers. Known for its excellent mechanical properties and reliability, this tubesheet undergoes 100% Ultrasonic Testing (UT) and Penetrant Testing (PT) to ensure the highest quality.

1. SA516 Gr.70N Chemical Composition and Mechanical Properties

SA516 Gr.70N is a normalized carbon steel grade widely used in pressure vessels and heat exchangers due to its excellent weldability, toughness, and resistance to pressure and temperature fluctuations. The "N" indicates normalization, a heat treatment process that enhances the material's strength and ductility.

Chemical Composition of SA516 Gr.70N

The controlled chemical composition ensures excellent toughness and resistance to stress-induced cracking, making it suitable for critical applications.

Mechanical Properties of SA516 Gr.70N

These properties make SA516 Gr.70N an ideal choice for heat exchanger tubesheets, capable of withstanding high pressures and temperatures.

2. Types of Tubesheets

Tubesheets are critical components in heat exchangers, providing support and anchoring for the tubes. They are drilled with precision to ensure proper alignment with the tubes, facilitating efficient heat transfer. Common types of tubesheets include:

Types of Tubesheets

1. Fixed Tubesheets: Permanently attached to the shell and tube bundle; ideal for non-corrosive fluids.
2. Floating Tubesheets: Allow for thermal expansion and contraction, commonly used in applications with high thermal stress.
3. U-Tube Tubesheets: Designed for U-tube heat exchangers, enabling compact designs and efficient heat transfer.
4. Double Tubesheets: Used in industries requiring zero cross-contamination, such as pharmaceuticals and food processing.

At Yuhong Holding Group, we manufacture tubesheets with precise tolerances and high-quality finishes to meet diverse design requirements.

3. Testing Requirements for Tubesheets

To ensure reliability and performance under extreme conditions, our SA516 Gr.70N Tubesheets undergo comprehensive testing. Each tubesheet is subjected to 100% UT (Ultrasonic Testing) and PT (Penetrant Testing) to detect any surface or subsurface defects.

Key Tests Performed

1. Ultrasonic Testing (UT): Detects internal flaws such as cracks, voids, or inclusions within the material.
2. Penetrant Testing (PT): Ensures the surface is free from defects such as cracks or pinholes.
3. Dimensional Inspection: Verifies the accuracy of drilled holes, outer diameter, and thickness.
4. Hardness Testing: Confirms the material meets the required mechanical properties.
5. Visual Inspection: Ensures a smooth surface finish and precise machining.

We provide detailed inspection reports and test certificates for each tubesheet, ensuring full traceability and compliance with industry standards.

4. Applications of SA516 Gr.70N Tubesheets

The SA516 Gr.70N Carbon Steel Tubesheets are highly versatile and used in a wide range of industrial applications. Key industries include:

• Petrochemical Industry: For pressure vessels and heat exchangers used in refining and chemical processing.
• Oil and Gas Industry: In processing plants, offshore platforms, and pipelines.
• Power Generation: For steam condensers, feedwater heaters, and other heat exchangers in power plants.
• HVAC Systems: For air conditioning and refrigeration systems.
• Chemical Processing: Where high-pressure and temperature-resistant heat exchangers are required.
• Food and Beverage Industry: In sanitary heat exchangers for processes like pasteurization.

The exceptional mechanical properties and durability of SA516 Gr.70N make it a reliable choice for high-performance heat exchanger applications.