Piping
Pipe fitting calculator: tools for pipefitters
Pipe offsets and rolling offsets, branches on pipes and elbows, mitre bends, reducers, pipe bending, fitting take-offs, flanges, line weight and hydrostatic test pressure: the pipefitter calculations of Metalary.
This page gathers the 18 piping tools of Metalary and 4 reference charts. Each tool page shows a worked example with the default values and cites its sources; results are indicative.
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.
Reference charts
Piping symbolsValves, pump and fittings on P&IDs (ISO 10628-2) and isometrics (ISO 6412-2).Threaded fittingsG, R, Rp, Rc and NPT: recognise, measure, never mix.Fitting dimensionsButt-weld elbows, tees, reducers, caps: ASME B16.9 and EN 10253-2.Pipe colour codingBackground colour by fluid family, NF X 08-100 and BS 1710.