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Piping

Piping symbols

In short

Valves, pump and fittings on P&IDs (ISO 10628-2) and isometrics (ISO 6412-2).

P&ID diagram (ISO 10628-2)

  • 2101Valve (general)

    Base body: two opposed triangles.

  • X8074Gate valve

    Short bar at the centre. Fully open or fully closed.

  • X8068Globe valve

    Solid dot at the centre. Used to throttle flow.

  • X8071Ball valve

    The triangles stop at a circle. Quarter turn.

  • X8075Butterfly valve

    Bar and dot at the centre: the disc.

  • X8077Check valve

    Small dot on the inlet side: one flow direction only (arrow).

  • 2301Pump (liquid)

    Circle, two lines meeting at the outlet; an extra middle line for the centrifugal type (2322).

  • Reducer

Isometric (ISO 6412-2)

  • Butt weld (shop)

    A dot on the line.

  • FWField weld

    Cross or dot marked FW. FFW: field fit weld, extra length to cut on site.

  • Flanged joint

    Two strokes across the line.

  • Elbow

    Often simplified: the straights extended to the vertex.

  • Tee
  • Cap
  • Flow direction
  • Wall penetration

These symbols vary between design offices: the drawing legend always prevails.

Sources

  • Deskely : symboles P&ID ISO 10628-2 : Numéros 2101, X8074, X8068, X8071, X8075, X8077, 2301 (link)
  • Deskely : symboles d’isométrique : Soudures atelier et chantier, brides (link)
  • ISO 6412-1:2017 (extrait public) : Article 4.2, coudes simplifiés (link)

Updated · Publisher: The Level Code

Tools · Piping

Isometric planLine entered item by item: dimensioned isometric, 3D, spool cut list, bill of materials, welds, PDF.Pipe offsetOffset a line with two elbows: cut length, angle from the spool or the run, elbow cut layout.Rolling offsetOffset both up and sideways with two elbows: true offset, cut length, elbow roll.Parallel pipe offsetSeveral parallel lines through the same offset: start shift of each line, cut length.Branch on pipeSaddle cut for a square, angled or offset branch: generator lengths and full-size wrap-around template.Branch on elbowSaddle cut for a branch at the middle of an elbow (outer side or flank): generators and full-size template.Mitre bendSegmented elbow: cut angle, outside / centreline / inside length of each piece, cutting template.Cut-down elbowCut a 90° or 45° elbow down to any angle: lengths at the back, side and belly, marks and cutting template.Tee + elbowTake-out of an elbow fitted on an equal tee, direct or with a spool; spool to cut for a given dimension.Swept teeBranch made from an elbow laid on the header: elbow cut, height-gauge marks, full-size header hole.ReducerConcentric or eccentric reducer: angle, taper and flat pattern to mark out on plate.Pipe bendingCut length, bend marks from the end, gain and approximate wall thinning.Standard fittingsTake-out of buttweld elbows, tees, reducers and caps (ASME B16.9, EN 10253-2).Flanges and boltingDrilling, bolts, studs and wrench size of an EN 1092-1 (PN) or ASME B16.5 (class) flange.Flange gasketDimensions of EN 1514-1 and ASME B16.21 flat gaskets and ASME B16.20 spiral wound gaskets (rings included).Jacketed pipePipe in a pipe: gap, spacers (height, count, positions), volumes, weight and gap in the elbows.Line weightWeight of a pipe run per metre and in total: pipe, water, insulation.Hydrostatic testIndicative test pressure (PED / EN 13480-5 or ASME B31.3) and gauge range.