Isometric Drawings and Plumbing Plans - Discussion No. 13 Unit 2

Oct 23, 2026

Upload by Finn

CMGT 235 Electrical and Mechanical Systems Discussion No. 13 Unit 2 focuses on plumbing systems and how tradespeople communicate piping layouts. It explains isometric drawings for DWV piping, defining key terminology (fitting, isometric, orthographic) and the tools and paper types used. It compares orthographic projections versus isometrics, highlighting how orthographics can hide details and how isometrics improve spatial visualization, planning, and integration of fittings on a single drawing. Examples cover orthographic projections for elbows and tees, plus isometric sketches for common pipe structures.

LanguageEnglish

CategoryTechnology

FormatPDF

Pages11

Reading Time28 min

AccessFree to download

Isometric Drawings

Plumbing plans for DWV piping system

Terminology and tools used

Orthographic drawings and limitations

Pipe Orthographics

Elbow fittings and projection views

Tee fittings and projection views

Notes on inward/outward fittings and hidden details

Isometric Drawings and Plumbing Plans

Benefits of isometrics in plumbing

Identifying an isometric drawing

Examples of isometric sketches

CMGT 235 – Electrical and Mechanical Systems Discussion No. 13 Unit 2-Plumbing Systems Fall 2022 Isometric Drawings and Plumbing Plans Isometric Drawings Plumbing plans for the DWV piping system are typically drawn by the plumber or mechanical engineer as“isometric drawings”. Terminology Fitting: an object used to connect one or more pieces of piping material to another. Isometric: a method of representing three-dimensional objects on a flat surface by means of a drawing that shows three planes of the object. Orthographic: a method for representing a threedimensional object by means of several views from various planes. Tools Used Pencil, ruler, eraser Tee square 30/60/90 triangle Materials Unlined paper Isometric paper Orthographic drawings Orthographic drawings are projections from a single angle. Most objects can be fully represented showing a front view, side view, and top (or plan) view. The biggest limitation of orthographic drawings is they represent a single perspective that may not show details hidden from view. For this reason, several views may have to be shown to indicate all details. Most commonly, front views and top views are shown. Example 1. Sketch the 2D Orthographic Projection of the isometric view shown Pipe Orthographics Piping systems are regularly represented by orthographic projections. Blueprints of a large project are typically top (or plan) views. The challenge of creating piping orthographics is that symbols must be used to represent 90° elbows or tees pointing toward or away from the viewer. The figure below identifies the possible orthographic projection views that could be used to represent an elbow fitting. Elbow fitting with possible orthographic projection Orthographic projections for the elbow fitting views labelled Tee fitting with possible orthographic projection Orthographic projections for the tee fitting views labelled Notes 􀂅 A fitting shown pointing “outward” from the page is shown with a dot. This represents the inside of the fitting. 􀂅 A fitting shown pointing “inward” into the page is indicated with a solid line halfway through the fitting. This represents the back of a fitting. 􀂅 As the sample plumbing orthographic illustrates, the biggest drawback of orthographic projections is that fittings are often hidden from view. In other words, the fittings closest to the viewer are clearly indicated, but the details of piping “in behind” are not shown. 􀂅 The hashmarks indicate the connection to another pipe or fitting. Example 2. Sketch the orthographic front view, plan view, and right view for the tube structure. Front view Plan view Right view Isometric Drawings and Plumbing Plans Isometric drawings are most commonly used by tradespeople to communicate a large amount of information ina single drawing. Because isometric drawings show three sides of an object, they make it easy to visualize how a finished project may look or to better understand how the pieces will fit together. As demonstrated in the development of orthographic drawings, much more detail can be conveyed in a single isometric drawing than ina series of three orthographic drawings. Isometrics show a three-dimensional object from three perspectives in a single drawing. An isometric drawing can be identified by several factors: 􀂅 Vertical planes or edges are still drawn vertically. 􀂅 Left and right planes are drawn at an angle of 30° above horizontal. 􀂅 No horizontal lines are found on isometrics. The strength of using isometrics in the plumbing trade is that all fittings can be shown on a single drawing, whereas an orthographic may have fittings hidden from view. This can create confusion and uncertainty in the mind of the tradesperson. It is common practice for a tradesperson to examine blueprint drawings (orthographic plan views) and create isometric sketches to clarify areas of uncertainty. This can be used to discuss issues with inspectors, supervi

FAQs

What are isometric drawings in plumbing, and what problem do they solve?

Isometric drawings represent three-dimensional objects on a flat surface using three planes. In plumbing, they help tradespeople communicate a large amount of information clearly in one drawing and visualize how parts and fittings fit together.

How do orthographic drawings differ from isometric drawings?

Orthographic drawings use several views from different planes, typically including front, side, and top/plan views. Their biggest limitation is that they can show only a single perspective, which may hide details not visible from the chosen viewpoints.

How are elbow and tee fittings represented in orthographic projections?

Orthographic projections use symbols to represent 90° elbows or tees that point toward or away from the viewer. The notes describe conventions such as using a dot for “outward” fittings and a solid line halfway through for “inward” fittings to indicate inside or back details.

Oct 23, 2026

Upload by Finn