Lord Fin Tube--Titanium Tube Sheet and Low Finned Tube
Detailed Tender for Manufacturing a New Tube Bundle for Oil & Gas Industry Client Appendix: Reference Standards- ASME BPVC Section VIII – Pressure Vessel Standards. ASTM B265 / SB 338 – Titanium Material Specs, TEMA Standards – Heat Exchanger Manufacturing
1. Titanium Tube Bundle Tender
Introduction This tender document outlines the requirements for the design, fabrication, testing, and supply of a new tube bundle for a heat exchanger used in the oil and gas industry. The tube bundle must be manufactured to strict industry standards to ensure reliability, corrosion resistance, and long-term performance in harsh operating conditions.
The scope includes material procurement, machining, assembly, quality control, and delivery of all specified components. Bidders must demonstrate prior experience in manufacturing similar heat exchanger components, particularly for high-pressure and high-temperature (HPHT) applications.
2. Tube Bundle Scope of Work & Technical Specifications
2.1 Tube Sheets
Material: ASTM B265 Grade 2 Titanium
-Why Titanium?
- Excellent corrosion resistance in sour gas (H₂S) and chloride-rich environments.
- High strength-to-weight ratio and thermal conductivity.
- Dimensions:
- Thickness: 70 mm (±0.5 mm tolerance)
- Diameter: - 915 mm (Quantity: 01 No.)
- 810 mm (Quantity: 01 No.)
- Machining Requirements:
- Hole Drilling: Precision-drilled for tube insertion (to be specified in final design).
- Surface Finish: Ra ≤ 3.2 µm to ensure proper gasket sealing.
- Flatness Tolerance: ≤ 0.1 mm/m²
2.2 Low-Finned Tubes
Material: SB 338 Grade 2 Seamless Titanium
- Why Low-Finned Tubes?
- Enhances heat transfer efficiency in condensers and coolers.
- Reduces fouling compared to smooth tubes.
- Dimensions: - OD: 19.05 mm (±0.1 mm) - Wall Thickness: 2.3 mm (MWT – Minimum Wall Thickness) - Length: 6,750 mm (±5 mm) - Quantity: 750 Nos.
- Fin Specifications: - Fins per Meter: 1,024 - Fin Height: 1.5 mm (±0.05 mm) - Fin Thickness: 0.27 mm (±0.02 mm) - Unfinned Ends: 80 mm at both ends for welding/expansion into tube sheets.
- Testing Requirements: - Hydrostatic Test: 1.5x design pressure (to be specified). - Eddy Current Testing (ECT): To detect surface defects.
2.3 Support Plates
Material: ASTM B265 Grade 2 Titanium - Function: Provides structural support to the tube bundle.
- Dimensions: - Thickness: 22 mm (±0.3 mm) - Diameter: 820 mm (±1 mm) - Quantity: 02 Nos.
- Hole Alignment: Must match tube sheet drilling pattern.
2.4 Baffle Plates
Material: ASTM B265 Grade 2 Titanium - Function: Directs fluid flow across tubes for optimal heat transfer. - Dimensions: - Thickness: 8 mm (±0.2 mm) - Diameter: 820 mm (±1 mm) - Quantity: 29 Nos. - Cut Pattern: Segmental baffles (to be confirmed in final design).
2.5 Support Rods
Material: Titanium Grade 2 - Function: Maintains alignment of baffle plates. - Dimensions: - Diameter: 20 mm (±0.1 mm) - Length: 6.5 meters (±5 mm) - Quantity: 03 Nos.
2.6 Sealing Strips
Material: ASTM B265 Grade 2 Titanium (Flat Bars) - Function: Prevents fluid bypass between tube bundle and shell. - Dimensions: - Thickness: 8 mm (±0.1 mm) - Width: 51 mm (±0.5 mm) - Length: 3 meters (±3 mm) - Quantity: 08 Nos.
3. Tube Bundle Manufacturing & Quality Control Requirements
3.1 Material Certification- Mill Test Certificates (MTC) for all raw materials. - Chemical Composition & Mechanical Properties must comply with ASTM/SB standards.
3.2 Fabrication Process- Tube Sheets & Plates: CNC machining for precision hole drilling. - Low-Finned Tubes: - Extrusion Process: Seamless manufacturing. - Fin Rolling: High-precision fin formation. - Welding (if applicable): - GTAW (TIG) Welding for titanium components. - Weld Procedure Qualification (WPQR) required.
3.3 Non-Destructive Testing (NDT)- Ultrasonic Testing (UT) for tube sheets. - Eddy Current Testing (ECT) for finned tubes. - Dye Penetrant Inspection (DPI) for welds.
3.4 Final Inspection & Testing- Dimensional Verification per engineering drawings. - Hydrostatic Pressure Test (if applicable). - Third-Party Inspection (TPI) may be required.
4. Tube Bundle Delivery & Packaging- Delivery Location:
- Packaging:
- Tube sheets & plates: Wooden crates with anti-corrosion coating.
- Finned tubes: Individual PVC sleeving & bundled packing.
- Shipping: Must comply with international freight standards (INCOTERMS to be specified).