High Precision Heat Exchanger Tube Sheet Custom Processing Advantages
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What is a high-precision heat exchanger tube sheet?
A high-precision heat exchanger tube sheet is a thick, custom-machined metal plate used in shell-and-tube heat exchangers to hold and isolate hundreds of tubes. It acts as a pressure barrier, separating the internal tube fluid from the external shell fluid while ensuring exact tube alignment for maximum thermal efficiency.
A total of 1,300 units of advanced equipment are utilized for the cutting, beveling, welding, heat treatment, drilling, and turning of precision tube sheets; the machining inventory includes 11 deep-hole drilling machines, 31 CNC multi-hole drilling machines, and 15 CNC lathes, enabling the provision of comprehensive services ranging from raw materials to multi-stage processing.
In addition to standard round holes, we provide technical support for irregular hole shapes-such as flower, serrated, and diamond patterns-to meet customized customer requirements.
Leveraging strong partnerships with steel mills, GNEE Stainless Steel maintains an extensive inventory of materials and can efficiently source specific supplies to meet customer requirements. We also provide processing services for tube sheets and baffle plates made from a wide range of materials, including commercially pure titanium, stainless steel clad composites, high-specification stainless steel, and various high-strength steels.
We provide machining services for tubesheets and baffle plates with diameters exceeding 6 meters; the maximum full-circle machining diameter is 10 meters, and the maximum drilling depth is 1.1 meters.
Tube-to-Tube Sheet Joints: Prepared for Welding (Strength weld/Seal weld) or Expanding (Grooved holes).
CNC Deep Hole Drilling: High-speed CNC drilling ensures no thermal deformation and high hole-position accuracy.
Deburring: Automatic machine deburring to ensure both sides are smooth, preventing tube damage during installation.
Rust Prevention: Cleaned and coated with light anti-rust oil (for Carbon/Clad) or passivated (for Stainless).
Common Material Grades & Standards
| Steel Category | Popular Grades | Standard Compliance |
| Austenitic | 304/304L, 316/316L, 321, 347, 310S | ASTM A182 (Forgings), A240 (Plate) |
| Duplex Steel | S31803 (2205), S32750 (2507), S32304 | ASTM A182, A240 |
| Super Austenitic | 904L, 254SMO (S31254) | ASTM A182 |
| Clad Materials | SS316L + Carbon Steel (Q345R/A105) | ASTM A264 (Explosion/Roll Bonded) |
Stainless Steel Heat Exchanger Tube Sheet Specification
| Item | Specification |
| Product Name | Stainless Steel Tube Sheet / Tube Plate |
| Manufacturing Method | Forged, Rolled, or Plate Cutting (Forged is preferred for pressure) |
| Processing | CNC Drilling, Reaming, Grooving, Machining |
| Hole Patterns | Triangular (30°/60°), Square (90°), Rotated Square (45°) |
| Application | Shell & Tube Heat Exchanger, Condenser, Evaporator, Pressure Vessel |
| Outside Diameter (OD) | 100 mm up to 5,000 mm |
| Thickness | 10 mm up to 800 mm |
| Hole Diameter Range | 6 mm to 150 mm |
| Drilling Precision | ± 0.01 mm (CNC Drilled) |
| Hole Position Tolerance | ≤ 0.05 mm |
| Groove Types | Single Groove, Double Groove, or Serrated |
The following tolerances comply with TEMA (Tubular Exchanger Manufacturers Association) and ASME Section VIII.
| Feature | Technical Requirement |
| Hole Tolerance | Per TEMA Table RCB-7.41 (Standard or Special Fit) |
| Ligament Width | Minimum ligament width maintained per ASME design calculation |
| Surface Finish (Face) | Ra 0.8µm – 3.2µm (Gasket Surface) |
| Drill Hole Finish | Ra 1.6µm – 3.2µm (Standard) |
| Parallelism | ≤ 0.5 mm or per customer drawing |
| Perpendicularity | Tube holes perpendicular to face within 0.002 in/in |
Inspection & Quality Control
| Test Item | Methodology / Requirement |
| Chemical Analysis | PMI (Positive Material Identification) & Spectrometer |
| Mechanical Test | Tensile, Yield, Elongation, Hardness (HBW/HRC) |
| Ultrasonic Test (UT) | Per ASTM A388 or SEL 072 (Detecting internal voids/cracks) |
| Dye Penetrant (PT) | Checking for surface cracks after machining/drilling |
| Dimensional Test | 100% Hole count verification & CMM (Coordinate Measuring Machine) |
| Intergranular Corrosion | Per ASTM A262 Practice A or E (If requested) |
Packaging & Documentation
Documentation: Mill Test Certificate (MTC) per EN 10204 3.1, Ultrasonic Test Report, Drilling Map/Inspection Report.
Protection: Gasket surfaces protected by plastic covers or plywood discs.
Crating: Heavy-duty fumigated wooden cases or steel frames for large diameters.
