Industry-Verified Manufacturing Data (2026)

Steam Generator Tube Bundle Assembly

Based on aggregated insights from multiple verified factory profiles within the CNFX directory, the standard Steam Generator Tube Bundle Assembly used in the Manufacture of Steam Generators, Except Central Heating Hot Water Boilers sector typically supports operational capacities ranging from standard industrial configurations to heavy-duty production requirements.

Technical Definition & Core Assembly

A canonical Steam Generator Tube Bundle Assembly is characterized by the integration of Heat Exchange Tubes and Tube Sheets. In industrial production environments, manufacturers listed on CNFX commonly emphasize Carbon Steel Alloy Tubes construction to support stable, high-cycle operation across diverse manufacturing scenarios.

Core heat exchange assembly for industrial steam generators.

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Product Specifications

Technical details and manufacturing context for Steam Generator Tube Bundle Assembly

Definition
A tube bundle assembly is the primary heat exchange component within industrial steam generators, consisting of multiple tubes arranged in a specific pattern within a shell. This component transfers thermal energy from combustion gases or other heat sources to water, converting it to steam for industrial processes. It represents a critical manufactured sub-assembly in the B2B supply chain for steam generator OEMs and maintenance providers. Proper design and manufacturing of this component directly impact steam generation efficiency, pressure capacity, and operational safety.
Working Principle
Heat from combustion gases or thermal fluids flows over the external surfaces of the tubes, while water flows inside the tubes. The temperature differential causes heat transfer through the tube walls, heating the water until it vaporizes into steam.
Common Materials
Carbon Steel Alloy Tubes, Stainless Steel Tube Sheets
Technical Parameters
  • Design thermal capacity (MW) Standard Spec
  • Maximum working pressure (bar) Standard Spec
Components / BOM
  • Heat Exchange Tubes
    Primary surface for heat transfer between fluids
    Material: Carbon steel or alloy steel
  • Tube Sheets
    Support and secure tube ends, provide pressure boundary
    Material: Carbon steel or stainless steel plate
  • Tube Supports/Baffles
    Maintain tube alignment and prevent vibration
    Material: Carbon steel
  • Expansion Joints Optional
    Accommodate thermal expansion of tubes
    Material: Stainless steel bellows
Engineering Reasoning
15.5-17.2 MPa (2250-2500 psi) at 343°C (650°F) saturation temperature
Tube wall thinning below 1.27 mm (0.050 in) from original 2.54 mm (0.100 in) thickness, or stress exceeding 172 MPa (25,000 psi) yield strength of SA-213 T22 alloy
Design Rationale: Flow-accelerated corrosion (FAC) due to single-phase liquid flow velocity exceeding 3 m/s, combined with oxygen concentration >5 ppb at pH<9.0, following the Bignold model of magnetite dissolution
Risk Mitigation (FMEA)
Trigger Water chemistry deviation with chloride concentration >0.15 ppm and dissolved oxygen >7 ppb
Mode: Stress corrosion cracking initiating at tube-to-tubesheet rolled joints, propagating at 0.5 mm/year in circumferential direction
Strategy: Install condensate polisher with mixed-bed ion exchange resin maintaining <0.1 ppm chloride, plus mechanical deaeration to <3 ppb oxygen
Trigger Thermal transient during startup exceeding 55°C/min (100°F/min) temperature ramp rate
Mode: Differential thermal expansion between Inconel 600 tubes (13.3 μm/m·K) and carbon steel tubesheet (11.7 μm/m·K) causing >0.25 mm gap formation
Strategy: Implement controlled startup curve with maximum 28°C/min (50°F/min) ramp, using preheating loops to maintain 120°C minimum temperature during shutdown

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Steam Generator Tube Bundle Assembly.

Heat Exchanger Tube Bundle Steam Generator Core Assembly Boiler Tube Bank industrial steam generator tube bundle carbon steel heat exchange tubes stainless steel tube sheet assembly steam generator tube bundle specifications custom tube bundle assembly manufacturing

Industrial Ecosystem & Supply Chain DNA

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Up to 15 MPa (150 bar)
flow rate: 10 to 500 m³/h
temperature: 150°C to 350°C
slurry concentration: Up to 30% solids by weight
Media Compatibility
✓ High-purity water/steam ✓ Thermal oils (e.g., Dowtherm) ✓ Non-corrosive process fluids (e.g., glycol solutions)
Unsuitable: Highly corrosive or abrasive slurries (e.g., hydrochloric acid with particulates)
Sizing Data Required
  • Required steam output (kg/h)
  • Inlet/outlet temperature differential (°C)
  • Available pressure drop across the bundle (kPa)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Stress corrosion cracking
Cause: Combination of tensile stress (from thermal expansion, pressure, or residual stresses) and corrosive environment (chlorides, sulfides, or caustic agents in steam/water), often exacerbated by material sensitization or poor water chemistry control.
Flow-accelerated corrosion (FAC)
Cause: Erosive thinning of tube walls due to turbulent, high-velocity single-phase or two-phase flow, particularly in areas with flow disturbances (bends, supports, or inlet regions), combined with low pH or oxygenated feedwater conditions that dissolve protective oxide layers.
Maintenance Indicators
  • Audible hissing or whistling from tube bundle area indicating steam or water leakage through cracked or thinned tubes
  • Visible wet insulation, dripping water, or steam plume around the generator shell, especially near tube sheet or tube supports
Engineering Tips
  • Implement strict water chemistry control: maintain pH within optimal range (typically 9.0-9.6 for all-ferrous systems), limit oxygen to <5 ppb, and control chlorides/sulfides to prevent corrosive conditions that accelerate both cracking and thinning mechanisms.
  • Conduct regular eddy current testing (ECT) inspections during outages to detect wall thinning, pitting, or cracking early, focusing on high-risk zones like U-bends, tube supports, and inlet regions, and establish tube plugging criteria based on remaining wall thickness.

Compliance & Manufacturing Standards

Reference Standards
ISO 9001:2015 - Quality Management Systems ASME BPVC Section I - Rules for Construction of Power Boilers EN 12952 - Water-tube boilers and auxiliary installations
Manufacturing Precision
  • Tube outer diameter: +/-0.05 mm
  • Tube-to-tube sheet weld penetration: minimum 90% of tube wall thickness
Quality Inspection
  • Eddy Current Testing (ECT) for tube wall integrity
  • Helium Leak Test for tube-to-tube sheet joint integrity

Factories Producing Steam Generator Tube Bundle Assembly

Verified manufacturers with capability to produce this product in China

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✓ 96% Supplier Capability Match Found

P Project Engineer from Australia Feb 10, 2026
★★★★★
"The technical documentation for this Steam Generator Tube Bundle Assembly is very thorough, especially regarding Tube Outer Diameter (mm)."
Technical Specifications Verified
S Sourcing Manager from Singapore Feb 07, 2026
★★★★★
"Reliable performance in harsh Manufacture of Steam Generators, Except Central Heating Hot Water Boilers environments. No issues with the Steam Generator Tube Bundle Assembly so far."
Technical Specifications Verified
P Procurement Specialist from Germany Feb 04, 2026
★★★★★
"Testing the Steam Generator Tube Bundle Assembly now; the Tube Outer Diameter (mm) results are within 1% of the laboratory datasheet."
Technical Specifications Verified
Verification Protocol

“Feedback is collected from verified sourcing managers during RFQ (Request for Quote) and factory evaluation processes on CNFX. These reports represent historical performance data and technical audit summaries from our B2B manufacturing network.”

12 sourcing managers are analyzing this specification now. Last inquiry for Steam Generator Tube Bundle Assembly from Thailand (1h ago).

Frequently Asked Questions

What materials are used in your steam generator tube bundle assemblies?

Our assemblies use carbon steel alloy tubes for optimal heat transfer and corrosion-resistant stainless steel tube sheets for structural integrity and longevity in industrial steam generation applications.

How do I determine the right tube bundle specifications for my steam generator?

Key specifications include heat transfer surface area (m²), number of tubes, tube length (m), outer diameter (mm), pitch (mm), and wall thickness (mm). Our engineers can help calculate optimal parameters based on your steam output requirements and operating conditions.

What maintenance considerations are important for tube bundle assemblies?

Regular inspection for tube erosion, corrosion monitoring at tube-to-tube sheet joints, checking expansion joint integrity, and ensuring proper tube support/baffle alignment are essential for maintaining optimal performance and preventing premature failure.

Can I contact factories directly on CNFX?

CNFX is an open directory, not a transaction platform. Each factory profile provides direct contact information and production details to help you initiate direct inquiries with Chinese suppliers.

Data Specifications verified by CNFX Industrial Index (v2.6.03) for Manufacture of Steam Generators, Except Central Heating Hot Water Boilers sector.

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