Pipe fitting symbols on isometrics
Fittings change the direction, size or end of the line: elbows, tees, reducers, caps, blinds and branch outlets. On an isometric they are drawn simply, with a weld dot at each welded end.
SymbolIsometricWhat it is
Concentric reducerA concentric reducer changes the pipe size with both ends on the same centre line.
Spectacle blindA spectacle blind is a plate with a solid disc and an open ring, joined like a figure 8, fitted between two flanges.
Branch outletA branch outlet, often called an olet, is a fitting welded onto the run pipe to take a smaller branch, instead of a tee.
Fittings
Elbows are drawn as sharp corners, not curves, unless the line is a bend with a special radius. The weld dots at each end show that the elbow is a separate fitting welded in.
Each fitting carries an item number that points to the bill of materials on the same sheet, where its size, rating, schedule and material are listed.
Frequently asked questions
Which fittings appear on a piping isometric?
This legend covers elbow, tee, concentric reducer, eccentric reducer, cap, blind flange, spectacle blind, branch outlet. Project legends may add more.
Can I download these symbols?
Yes. Each symbol page has free SVG files, and the hub has printable PDF charts.
From the isometric to the signed test pack.Deskely Testpack builds test packs from the line list and the drawings, records the test in the field and tracks reinstatement to the last spade.
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