Before a drawing is issued, the numbers behind it need to hold up. Wall thickness against design pressure, nozzle reinforcement, support loading, material selection against service conditions.
This service covers the code-based design calculation work that sits underneath the drawing: the documented basis that shows a design is compliant, not just that it looks right.
What's Covered
- Pressure-containing component sizing: wall thickness, head design, nozzle reinforcement, to the relevant code for the equipment and market. See each Manufacturers page for the specific codes that apply by equipment type and region.
- Re-rating calculations for equipment already in service, where a change in operating conditions requires a fresh calculation against the original or current code edition.
- Revision history so procurement and the shop are always working off the same issue
- Material selection and documentation support tied to the calculation basis: allowable stress, temperature limits, corrosion allowance.
Where a 3D model exists, the GA and BOM are both derived directly from it, which is what keeps them in sync. A change to the model updates the drawing and the BOM together, the same day, rather than requiring two separate manual edits that can drift apart. For simpler items without a model, the GA is built directly, with the same discipline around keeping drawing and BOM as a single linked deliverable rather than two documents maintained separately.
Revision control follows the same logic: every issued revision carries a clear revision history, and a change at any point in the drawing is reflected in the BOM before the package goes out, not as a follow-up correction after someone catches the mismatch downstream.
Fabrication-ready means the drawing carries the dimensions, tolerances, and callouts a shop needs to build from without sending a clarification request back. Every package goes through a checking step before issue, a second look specifically aimed at catching drawing versus BOM mismatches before they reach the shop floor or procurement desk.
How This Differs From FEA & Stress Analysis
This page covers code-based, calculation-driven design work: the documented basis required for code compliance and fabrication sign-off. The FEA & Stress Analysis page covers simulation-based analysis (finite element modelling, pipe stress software) used where geometry or loading is complex enough that a closed-form calculation is not sufficient on its own. Many projects use both; they are listed separately because they are different methods answering different questions.