Piping graphics — Are axonometric views (especially isometrics) rarely used in piping documentation, or are they actually common and valuable for routing and fabrication?

Introduction / Context:
Piping systems are documented using a mix of representations: P&IDs, orthographic plans/sections, and piping isometrics (axonometric). Isometric drawings are widely used to show routing, coordinates, elevations, bill of materials, weld maps, and spool details. The statement claims axonometric drawings are seldom used, which contradicts common practice.

Given Data / Assumptions:

• Axonometric includes isometric, dimetric, and trimetric views.
• Industry uses isometric piping drawings extensively for fabrication and installation.
• Orthographic drawings and P&IDs are complementary, not replacements.

Concept / Approach:
Isometric piping drawings flatten 3D routing into a measurable axonometric view where lengths can be taken along axes, fittings are clearly identified, and spools are defined. They support material take-off and field work by showing a single line per pipe centerline with clear callouts. Therefore, axonometric views are not rare; they are foundational in many plants and projects.

Step-by-Step Solution:
1) Identify typical piping deliverables: P&ID, orthos, isos.2) Recognize purposes: isos capture routing and fabrication data.3) Compare usage: isos are standard, not seldom used.4) Conclude the statement is incorrect.

Verification / Alternative check:
Review any piping project package: each line usually has an isometric with line number, spec, size, and bill of material; fabricators rely on these for spool fabrication.

Why Other Options Are Wrong:

• Correct: Wrong because axonometric is common.
• Residential only / conceptual only / plastic only: Isometrics are used across sectors and materials.

Common Pitfalls:
Confusing P&IDs (schematic) with isometrics (physical routing); assuming orthographic plans can fully replace isos for fabrication; omitting elevations and coordinates in isos.

Final Answer:
Incorrect