ASME SA192 Base Tube Composition

• Carbon, % 0.06–0.18
• Manganese, % 0.27–0.63
• Phosphorus, max, % 0.035
• Sulfur, max, % 0.035
• Silicon, max, % 0.25

ASME SA192 Serrated Fin Tube Application

• Economizer: Using flue gas waste heat to preheat boiler feed water, the serrated fin significantly increases the heat transfer area on the flue gas side and improves the heat recovery efficiency (3-5 times higher than the light tube). Typical parameters: flue gas temperature 250-400℃, pressure ≤5 MPa, fin material can be SA192 base tube + carbon steel fin (oxidation resistance).
• Air Preheater: In coal-fired power plants, heating combustion air, fin design to reduce ash accumulation, anti-smoke erosion wear.
• Process gas cooler: Handling corrosive gases (e.g. H₂S, CO₂), SA192 base tube resistant to high temperature, serrated fins enhance turbulence and reduce scaling. Recycled flue gas cooling in a catalytic cracking unit, with fin tubes replacing conventional spiral fins, reduces pressure drop by 15%.
• Waste heat recovery system: Gas Turbine Exhaust waste Heat Boiler (HRSG), in the high temperature (500-600℃), high flow rate of exhaust gas, sawtooth fin strong vibration resistance, to avoid fatigue fracture. High-frequency welding fins are used to ensure the bonding strength between the fins and the base tube, which is assessed by ASME Sec.IX welding process.

ASME SA192 Serrated Fin Tube Key Strength

1. Material Properties:

• Tensile Strength: ASME SA192 tubes typically have a minimum tensile strength of around 47,000 psi (324 MPa).
• Yield Strength: The minimum yield strength is usually around 26,000 psi (179 MPa).
• Elongation: The material should have good ductility, with elongation typically around 35% in 2 inches.

2. Fin Design:

• Fin Height and Thickness: The height and thickness of the fins can affect the overall strength of the tube. Thicker and shorter fins generally provide better strength and heat transfer efficiency.
• Serration Pattern: The serration pattern (depth and frequency) can influence the mechanical strength and thermal performance. Proper design ensures that the fins do not become weak points.
• Operating Conditions: Temperature: ASME SA192 tubes are designed for high-temperature service. The material's strength decreases as temperature increases, so it's important to consider the maximum operating temperature.

3. Operating Conditions:

• Temperature: ASME SA192 tubes are designed for high-temperature service. The material's strength decreases as temperature increases, so it's important to consider the maximum operating temperature.
• Pressure: The tubes must withstand the internal pressure of the boiler or heat exchanger. The wall thickness of the tube is a critical factor in pressure containment.

4. Manufacturing Process:

• Seamless Construction: ASME SA192 tubes are seamless, which generally provides better strength and reliability compared to welded tubes.
• Fin Attachment: The method of attaching the fins (e.g., extrusion, welding) can affect the overall strength. Proper attachment ensures that the fins do not detach under operational stresses.

ASME SA192 Serrated Fin Tube Standards and Compliance
 

• ASME Boiler and Pressure Vessel Code: Ensure that the tubes comply with the relevant sections of the ASME BPVC, particularly Section I for power boilers and Section VIII for pressure vessels.
• Testing and Inspection: Non-destructive testing (NDT) methods such as ultrasonic testing (UT) and hydrostatic testing are often required to ensure the integrity of the tubes.