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Maiterio is currently manufacturing 96 tube sheets for a customer in Mexico, with the products progressively moving through precision machining, inspection, and packaging.
1. Precision Drilling | Approximately 2,500 Holes per Tube Sheet
Each tube sheet requires approximately 2,500 drilled holes. With such a large number of holes, maintaining dimensional accuracy and consistency throughout the machining process is essential.
Before batch production, multiple machining passes and cutting parameter tests are conducted to adjust and optimize the drilling process, ensuring that all drilled holes remain within the specified tolerance range.
Strict control of each hole's dimensional accuracy provides a reliable foundation for subsequent tube installation and expansion.
2. Tube Expansion Groove Machining | Two Grooves per Hole
After drilling, two tube expansion grooves are machined inside each hole.
The customer's specified groove dimensions are:
- Required dimension: 19.55–19.75 mm
- Actual measured dimension: 19.60 mm
- Inspection result: Within the specified tolerance range
By precisely controlling the groove dimensions, we ensure that the machined grooves meet the technical requirements for subsequent tube-to-tubesheet expansion.
3. Product Stamping | Ensuring Material Identification and Traceability
As required by the customer, each tubesheet shall be marked with six lines of stamped identification, as detailed below:
| Line | Identification Item | Marking Content |
|---|---|---|
| Line 1 | Raw Material Supplier | CITIC / XINGCHENG S.S. |
| Line 2 | Manufacturer | MAITERIO |
| Line 3 | Material Grade | SA-516-70N |
| Line 4 | Part Number | Customer-Specified Part Number |
| Line 5 | Project Number | 143-181 (1/5) to (5/5) |
| Line 6 | Drawing Number | Customer-Specified Drawing Number |
Clear and standardized product markings allow customers to identify the material grade, heat number, and heat treatment condition, supporting quality traceability and subsequent product inspection.
4. Packaging and Protection
During the packaging stage, each tube sheet is wrapped with three layers of protective film to help prevent dust, moisture, and surface scratches during storage and transportation, providing reliable protection before delivery.
From precision drilling of 2,500 holes to tube expansion groove machining, product stamping, and final protective packaging, Maiterio maintains strict control over every detail to ensure product quality and reliable delivery.
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