A general arrangement (GA) drawing shows the overall geometry, dimensions, and connection points of a piece of equipment.
The bill of material (BOM) lists every part on that drawing: part number, material, quantity. The two have to match exactly, every time, including after a revision. When they do not, procurement orders the wrong thing, or the shop builds something that does not match what was ordered. That mismatch is one of the most common and most avoidable causes of cost and schedule overrun in fabrication, and it is the problem this service is built to remove.
Process Engineering
Our process engineering services — delivered as part of our broader mechanical engineering subcontracting services — encompass basic and extended engineering tasks, including PFD and P&ID development, line sizing, energy mass balance, utility consumption summary, electrical load list, HAZOP, PDS, IPDS, process simulation, sizing calculations, and the preparation of intelligent AutoCAD P&ID diagrams, line lists, equipment lists, valve lists, and more.
Piping Engineering
We specialise in piping engineering designs for EPCs and engineering services for pressure equipment fabricators across industries including oil and gas, process, fertilizer, utility, renewable energy, and power. Our expertise lies in creating efficient piping solutions that adhere to international codes and standards. We provide services in piping design engineering, stress analysis, and piping support engineering.
Equipment Engineering
Our experienced team specialises in detailed engineering services for OEM manufacturers, covering the design, analysis, and improvement recommendations for various equipment types — including storage tanks, pressure vessels, towers, shell and tube heat exchangers, and more. We offer services in storage tank design, pressure vessel design, and heat exchanger design, ensuring optimal performance and compliance with industry standards.
Civil Engineering
We provide comprehensive civil and structural engineering services for the development of general infrastructure, civil foundations, and technological structures across a wide range of industries — including oil and gas refineries, petrochemicals, utilities, plant and non-plant buildings, offshore modules, skids, and more. As a mechanical engineering subcontracting services provider, we ensure safe, code-compliant, and efficiently delivered construction projects.
Electrical Engineering
We specialise in designing and engineering electrical systems for modern industrial plants. Our services encompass the creation of single line diagrams, specifications for electrical switchgear, transformers, motor control centers, starters, and more. As an engineering services partner for pressure equipment fabricators and industrial clients, we provide complete electrical project engineering — including estimation and scheduling, electrical load analysis, system architecture design, and power distribution system design.
Instrumentation Engineering
Our comprehensive instrumentation and control services encompass instrument datasheets, I/O lists, cause and effect diagrams, instrument hook-up diagrams, control room layout, DCS specifications, and more. As a design engineering partner for equipment manufacturers handling both brownfield and greenfield projects, our experienced team assists in implementing the right instrumentation systems and addresses complex site-specific challenges. We offer complete control system design, engineering, estimating, and scheduling, instrument design and specification, as well as procurement support.
How It's Produced
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.
Tools Used
GA and BOM work is produced in SolidWorks / Inventor / AutoCAD, with BOM extraction and revision tracking managed through the same tools so the drawing and the parts list are never edited as two separate documents.
What's Included
- GA drawing(s): plan, elevation, and sections as needed for the equipment
- BOM with part numbers, materials, quantities, and weights where relevant
- Revision history so procurement and the shop are always working off the same issue
Used across pressure vessels, storage tanks, skids, piping systems, and heat exchangers. See the Manufacturers We Support pages for how GA/BOM requirements differ by equipment type and region.