Spool fabrication isometrics with weld mapping, material lists, and dimensional take-offs. Generated from 3D models or drafted from surveyed measurements. Reduce field welds by 40% through optimised pre-fabrication.
Intelligent 3D plant modelling in AutoCAD Plant 3D, AVEVA E3D, and Bentley OpenPlant.
Complete plant layout, piping design, and engineering drawing services.
P&ID process and instrumentation diagrams to ISA-5.1 and BS EN 1069 standards.
Intelligent pipe routing with clash detection, slope optimisation, and support span validation.
Spool isometric with weld numbers, dimensions, and material list
Isometric piping drawings are the primary fabrication documents used by pipe fitters and welders to construct spools in the workshop before transporting them to site for final assembly. Unlike plan views that show only horizontal projection, isometrics display the pipe in three-dimensional axonometric projection with all dimensions, fittings, welds, and supports visible. This allows fabricators to understand complex geometries – risers, offsets, and expansion loops – that would be ambiguous in orthographic views alone.
Reynolds & Bauhm generates isometrics from intelligent 3D models with automatic spool splitting, weld numbering, and material list extraction. For retrofit projects without 3D models, we draft isometrics from surveyed measurements and GA drawings. Every isometric includes coordinate dimensions from a defined datum, weld mapping with NDT requirements, pre-fabrication and field weld distinction, and heat tracing and insulation specification.
Coordinate dimensions (north, east, elevation) from a defined datum point. Cut lengths for each pipe segment with end preparation details (plain, bevel, or threaded).
Unique weld numbers for every joint with weld type (BW, SW, FW), specification (WPS reference), NDT requirements (RT, UT, PT, MT), and welder qualification.
Complete BOM with pipe lengths, fittings, flanges, valves, gaskets, bolts, and consumables. Specification references and procurement package numbers.
Clear distinction between workshop fabrication welds and field erection welds. Shop welds are made in controlled conditions; field welds require weather protection and additional inspection.
Insulation thickness, type (mineral wool, PIR, cellular glass), and cladding specification. Heat tracing cable routing and connection box locations.
Support positions, types (rigid, spring, guide, anchor), and loads. Expansion joint locations and movement direction arrows for thermal growth accommodation.
Spools are split into transportable and shop-fabricable lengths based on road transport limits (typically 12 m in Europe), workshop crane capacity, and site access constraints. We optimise spool splitting to minimise field welds while respecting practical handling limits.
We support workshop fabrication with isometric packages organised by erection sequence, weld procedure specifications, and inspection test plans. Each spool is issued with a unique fabrication number for traceability through shot blasting, priming, welding, NDT, and hydrotest.
| Projection Angle | 30° isometric (ISO) or 45°/45° dimetric (client preference) |
| Scale | Typically 1:25, 1:50, or not-to-scale with full dimensions |
| Max Spool Length (transport) | 12 m (Europe), 18 m (special permit), container-limited for overseas |
| Max Spool Weight (lift) | 5 – 20 tonnes (site crane and rigging dependent) |
| Field Weld Target | <20% of total welds for high-performance projects |
| Weld NDT Coverage | 5-100% RT/UT depending on service, code, and client specification |
| Dimensional Tolerance | ±3 mm (shop); ±10 mm (field) relative to isometric datum |
| Hydrotest Pressure | 1.5x design pressure for 30 minutes minimum per EN 13480 / ASME B31.3 |
From conceptual layouts to construction-ready drawings, Reynolds & Bauhm delivers complete drafting and modelling services to global standards. Speak with our design engineers to scope your project.
Our expertise spans multiple industries with sector-specific water treatment solutions.