ASME SA240 SS304 Heat Exchanger Tube Sheet Precision CNC-Drilled for Corrosion Resistant Petrochemical Service
The tubesheet is a perforated circular plate that secures and aligns the tube bundle while maintaining a pressure-tight barrier between shell-side and tube-side fluids. It is the primary pressure-containing component of a shell-and-tube heat exchanger.
This tubesheet is manufactured from ASME SA240 Type 304 stainless steel (UNS S30400) - the industry-standard austenitic grade offering a balance of corrosion resistance, formability, and weldability. The material provides reliable performance in service temperatures up to 465°C (870°F) in oxidizing environments.
Manufacturing: Precision CNC-drilled and machined per client-supplied TEMA layout drawings (triangular or square pitch), with pass partition grooves and sealing faces machined to specification.
All tubesheets are produced in strict compliance with ASME SA240 / ASTM A240 - no alternative standards are applied.
| Element | Composition (%) |
|---|---|
| Carbon (C) | ≤ 0.07 |
| Manganese (Mn) | ≤ 2.00 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
| Silicon (Si) | ≤ 0.75 |
| Chromium (Cr) | 18.0 - 20.0 |
| Nickel (Ni) | 8.0 - 10.5 |
| Nitrogen (N) | ≤ 0.10 |
| Property | Value |
|---|---|
| Tensile Strength | ≥ 515 MPa (75,000 psi) |
| Yield Strength (0.2% offset) | ≥ 205 MPa (30,000 psi) |
| Elongation | ≥ 40% |
| Hardness | ≤ 92 HRB (≤ 201 HBW) |
| Parameter | Range / Tolerance |
|---|---|
| Outer Diameter | Custom, up to 3,000 mm+ |
| Thickness | 25 mm to 150 mm+ (custom available) |
| Tube Hole Diameter Tolerance | +0.05 / -0.00 mm (CNC precision) |
| Hole Pitch | Per TEMA layout (typically 25.4 mm to 31.75 mm) |
| Grooves per Hole | 2 or 3 precision annular grooves |
All tubesheets undergo comprehensive non-destructive examination (NDE) with full material traceability maintained via Mill Test Reports (MTRs).
| Test Method | Purpose | Acceptance Criteria |
|---|---|---|
| Penetrant Testing (PT) | Detects surface discontinuities (cracks, porosity, laps) | ASME SA240 / customer specification |
| Ultrasonic Testing (UT) | Detects subsurface flaws (inclusions, laminations, voids) | ASME SA240 / customer specification |
| PMI (Positive Material Identification) | Verifies alloy composition via XRF | Per material certificate |
| Dimensional Inspection | Verifies hole diameter, pitch, groove depth, surface finish, OD/thickness | Per TEMA layout + customer drawing |
| Visual Inspection | Surface finish, pass partition groove alignment, sealing face condition | Per ASME + TEMA requirements |
PT and UT are performed at 100% inspection rate on critical surfaces.
ASME SA240 SS304 tubesheets are specified for heat exchanger services where tube-side or shell-side fluids are mildly corrosive and chloride concentrations remain low.
- Petrochemical & Refining - Heat transfer in refining and chemical processes
- Pharmaceutical - Sanitary heat exchangers for controlled processing
- Food & Beverage - Process heating/cooling where hygiene and cleanability are required
- Power Generation - Low-pressure feedwater heaters, lube oil coolers
- HVAC & Refrigeration - Chiller barrels, condensers, evaporator bundles
- General Industry - Water coolers, hydraulic oil coolers, non-aggressive fluid handling
Design pressure limit: ≤ 30 bar (~435 psi) for rolled plate construction.
- Corrosion resistance: Chromium content of 18.0-20.0% and nickel content of 8.0-10.5% provide resistance to oxidation and corrosion from atmospheric exposure, freshwater, steam, and mild chemical solutions.
- Precision fit: CNC-drilled tube holes to +0.05 / -0.00 mm tolerance prevent bypass leakage and ensure consistent tube rolling.
- Joint integrity: 2 or 3 precision annular grooves per hole maximize mechanical pull-out strength during hydraulic tube expansion.
- Traceability: Full material certification with MTRs verifying ASME SA240 compliance for chemistry and mechanical properties.
- Custom OD and thickness per drawing
- Tube hole patterns: triangular or square pitch per TEMA layout
- Custom groove configurations
- Floating or stationary tubesheet designs
- Rolled plate (SA240) or forged construction options
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