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Heat Exchanger Baffle
Created with Pixso. ASME SA516 Gr.70 Heat Exchanger Baffle Heat Exchanger Components

ASME SA516 Gr.70 Heat Exchanger Baffle Heat Exchanger Components

Brand Name: YUHONG
Model Number: YGC-HX-BF-70
MOQ: 1pc
Price: Negotiation
Delivery Time: According to the quantity
Payment Terms: T/T, L/C
Detail Information
Place of Origin:
China
Certification:
ASME, CCS, ABS, GL, DNV, NK, PED, AD2000, GOST9941-81, ISO 9001-2015
Material:
Gr.70
Standard:
ASME SA516
Product:
Baffle
Application:
Heat Exchanger
Packaging Details:
Plywood case
Supply Ability:
TBD
Highlight:

Gr.70 Heat Exchanger Baffle

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ASME SA516 Heat Exchanger Baffle

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ASME SA516 Heat Exchanger Components

Product Description

 

ASME SA516 Gr.70 Baffle: Heat Exchanger Carbon Steel Plate Component​

 

 

 

What is the role of baffles in heat exchangers?

 

Baffles are critical internal components in shell-and-tube heat exchangers, designed to optimize fluid dynamics, enhance heat transfer efficiency, and provide structural support to the tube bundle. ASME SA-516 Gr.70 is a carbon steel specification widely used for manufacturing baffles due to its excellent balance of strength, weldability, and cost-effectiveness. This grade is particularly suited for moderate and low-temperature applications in industries such as oil refining, chemical processing, and power generation. Below is a detailed technical overview of SA-516 Gr.70 baffles, including material properties, design considerations, and application guidelines.

 

ASME SA516 Gr.70 Heat Exchanger Baffle Heat Exchanger Components 0

 

 

1. Material Specifications

 

ASME SA-516 Gr.70 is a normalized carbon-manganese steel plate compliant with ASME Boiler and Pressure Vessel Code (BPVC) Section II. The "Gr.70" designation refers to its minimum tensile strength of 70 ksi (485 MPa), making it ideal for pressure-retaining components in moderate service conditions.

 

Chemical Composition (Weight %)

 

Element Min (%) Max (%)
Carbon (C) - 0.27
Manganese (Mn) 0.85 1.20
Phosphorus (P) - 0.025
Sulfur (S) - 0.025
Silicon (Si) 0.15 0.40

 

Mechanical Properties

 

Property Value
Tensile Strength 485–620 MPa (70–90 ksi)
Yield Strength ≥ 260 MPa (38 ksi)
Elongation ≥ 21% (in 200 mm)
Impact Toughness ≥ 20 J @ -29°C (Charpy V-notch)*
Hardness 140–200 HBW (Brinell)

*Required for applications below -29°C (-20°F).

 

 

2. Key Advantages

  • Cost-Effective: Lower material and fabrication costs compared to alloy steels.

  • Weldability: Compatible with common welding techniques (SMAW, GTAW, SAW) without preheat for thicknesses ≤ 32 mm.

  • Low-Temperature Toughness: Suitable for service down to -29°C (-20°F) with proper impact testing.

  • Formability: Easily shaped into segmental, helical, or rod baffle designs.

 

 

3. Design Considerations

 

Baffle Types

  • Segmental Baffles: Most common; cut to 20–35% of shell diameter to direct cross-flow.

  • Helical Baffles: Reduce dead zones and vibration risks.

  • Rod Baffles: Minimize pressure drop in high-flow applications.

Technical Parameters

  • Thickness: Typically 6–25 mm, depending on shell pressure and flow-induced loads.

  • Spacing: 20–50% of shell diameter; tighter spacing increases heat transfer but raises pressure drop.

  • Tolerances: Tube hole drilling ±0.5 mm; alignment critical to prevent tube vibration.

 

 

4. Fabrication & Manufacturing

  • Cutting/Forming: Laser/plasma cutting or machining for precision; cold forming for curved baffles.

  • Welding:

    • Filler Metals: AWS E7018 for SMAW; ER70S-6 for GTAW.

    • Post-Weld Heat Treatment (PWHT): Required for thicknesses > 32 mm or severe cyclic service.

  • Corrosion Protection:

    • Coatings: Epoxy, phenolic, or rubber linings for corrosive environments (e.g., seawater).

    • Cladding: Optional stainless steel (304/316) overlay for aggressive chemicals.

 

 

5. Applications

 

SA-516 Gr.70 baffles are used in:

  • Oil & Gas: Crude oil coolers, amine reboilers.

  • Chemical Plants: Solvent condensers, reactor feed exchangers.

  • Power Generation: Feedwater heaters, turbine lube oil coolers.

  • HVAC: Chillers and condensers.

 

 

6. Standards & Compliance

  • ASME BPVC Section VIII: Governs design and fabrication of pressure vessels.

  • TEMA Standards: Defines baffle spacing, layout, and tube support requirements.

  • ASTM A516/A516M: Material specifications for steel plates.

  • NDT Requirements:

    • Dye Penetrant Testing (PT): For weld inspection.

    • Ultrasonic Testing (UT): Optional for critical thicknesses.

 

 

7. Comparison with Other Grades

 

Grade SA-516 Gr.60 SA-516 Gr.70 SA-285 Gr.C
Tensile Strength 415 MPa (60 ksi) 485 MPa (70 ksi) 380 MPa (55 ksi)
Impact Toughness Lower Higher Moderate
Cost Lower Moderate Lowest

 

 

8. Limitations

  • Corrosion Susceptibility: Not suitable for highly corrosive fluids without coatings/cladding.

  • Temperature Limits: Maximum service temperature ~450°C (842°F); above this, oxidation resistance declines.

  • Thickness Constraints: Thicker plates may require PWHT, increasing fabrication costs.

 

ASME SA516 Gr.70 Heat Exchanger Baffle Heat Exchanger Components 1