Piping Takeoff from Isometric Drawings: From the ISO to the MTO and the Fabrication BOM
A piping takeoff turns a set of isometrics into two different lists: a material take-off (MTO) that procurement and estimating price, grouped by item code, size and class across the whole set, and a fabrication bill of materials (BOM) that the shop builds from, spool by spool, with cut lengths and numbered welds. This guide covers the documents you need, how to read an isometric, how each list is built, a worked isometric rolled up into both, allowances, revisions against stock already ordered, traceability, and how to test any method on your own drawings.
- Published
- Sources checked
- Reading time
- 15 min
- Written by
- Mirage Metrics team
Scope: process and industrial piping drawn as isometrics, for EPC contractors, fabrication shops, methods engineers and estimators. It is not a design guide: stress, support design, examination extents and pricing stay with the codes, your specifications and your engineers.
Decision snapshot
- Best suited to
- Estimators and methods engineers at EPC contractors, industrial engineering firms and pipe fabrication shops who take off isometrics by hand or check a takeoff someone else produced.
- Inputs needed
- The isometrics at their current revision, the line list, the piping material specification, the P&IDs, the valve and specialty item lists, the support standards, the insulation and painting specifications, and your rules on allowances and scope splits.
- What can be automated
- Reading every iso and its material list, checking each item against its piping class, rolling quantities up by item code, splitting MTO and spool BOM, numbering welds shop and field, computing paint surface, comparing two revisions, and keeping each quantity tied to its sheet.
- What requires human approval
- Spec breaks and items at continuations, scope splits with other packages, allowances, spool breaks and shipping limits, conflicts between the iso and the line list, and the sign-off before anything is ordered or cut.
- When this approach is insufficient
- When the isometrics are not issued yet (only a preliminary MTO is possible, from P&IDs and layouts), when the piping class is incomplete, or when the isos are too poor to read reliably and the line list contradicts them.
The documents a piping takeoff needs
The isometric is the drawing you count from, but no single document carries everything an MTO needs. The isometric gives geometry and components; the piping class tells you what each component is; the line list tells you what applies to the whole line; the P&ID tells you what should be there at all. Collect them at the same revision before the first count.
| Document | What it holds | What the takeoff takes from it |
|---|---|---|
| Isometric drawings (ISOs) | One line, or part of one, per sheet: route, dimensions, components, welds, supports, and usually a material list | Every quantity of pipe, fittings, flanges and welds; spool breaks on fabrication isos |
| Line list | One row per line: size, service, piping class, design and test conditions, insulation, often painting | The spec, insulation and paint system that apply to each iso; the list of lines that must have an iso |
| Piping material specification (piping classes) | For each class, the component allowed for each size range: pipe wall or schedule, fittings, flange rating and facing, gasket, bolting, valve codes, branch rules | The description and item code behind every BOM line; a check that the iso uses what its class allows |
| P&IDs | Lines, valves, instruments, spec breaks and line numbers, as a diagram | Scope: which lines exist, where the class changes, which valves and inline items each line carries |
| Piping plans, general arrangement, plot plan | Where lines run in the plant | Lengths for an early estimate before isos exist; the battery limits of the scope |
| Valve list, specialty item list, instrument list | Tagged items bought by tag rather than by commodity | Which items piping buys and which arrive with another package; the gaskets and bolts their flanges still need |
| Support standards and support list | Support types and the tags shown on the isos | Support counts by type, and the special supports that need their own drawing |
| Insulation and painting specifications | Systems, thicknesses and coats by service and temperature | Insulated lengths and items, paint surface |
An isometric is a standardised way of drawing one pipeline in three dimensions on a flat sheet, set out in ISO 6412-2. Piping isometrics are normally drawn without a scale, so lengths come from the dimensions written on the sheet, never from measuring it.
What a P&ID cannot give you
A P&ID is a flow diagram, the family ISO 10628-1 classifies for process plants. It shows what is connected to what: the lines, their numbers, the valves, the instruments, the places where the piping class changes. It does not show where the pipe runs. A P&ID has no geometry, so it cannot produce the quantities of an isometric: no pipe length, no elbow count, no support, no weld, no spool.
What it does give is the scope and a check. Before the isometrics exist, a preliminary MTO combines the P&ID (lines, valves, inline items) with lengths estimated from the piping plans or the plot plan. Once the isos are issued, every valve and inline item on the P&ID should appear on exactly one iso, and every line on the line list should have its isos. That cross-check is what information take-off (ITO) on P&IDs and isometrics covers.
Reading an isometric: line numbers, specs, the BOM table
The line number
Every isometric belongs to a line, and the line number is the key that joins it to the line list and the P&ID. Its structure is set by each project's numbering procedure; a common pattern, with invented values:
| Field | Example | What it tells the takeoff |
|---|---|---|
| Size | 6" | Nominal pipe size (NPS) in inches or DN in millimetres, as the project uses |
| Service or fluid code | P | A code from the project's fluid list (here, invented: process liquid) |
| Sequence number | 1204 | Unique within the project or the unit |
| Piping class | A1 | Points to the piping material specification that governs every component |
| Insulation code | IH50 | Type and thickness, when the line is insulated |
Spec breaks
Where the piping class changes along a line, a spec break is drawn on the P&ID and on the iso, usually at a flange or a valve. The components on each side are bought under different classes, so the MTO splits them there. The joint itself (gasket and bolts at the break) belongs to whichever class the project rule names; a takeoff that does not apply a rule here will count the joint twice or lose it.
The material list on the isometric
Isometrics produced from a 3D model usually carry a material list: a part number for each item, a description, a size, a quantity, and often an item code from the piping class. Many split it into fabrication materials (pipe, fittings, flanges welded in the shop) and erection materials (valves, gaskets, bolts, items installed in the field). Pipe is given in length, everything else in counts. The description follows the class: the piping class sets which component, which wall or schedule and which rating apply to each size, and the dimensional standards define what those words mean.
- Pipe: size and wall or schedule, with dimensions from ASME B36.10 for wrought steel pipe; end preparation (bevelled for butt welds, plain for socket welds).
- Buttwelding fittings: elbows, tees, reducers, caps, dimensioned by ASME B16.9; their centre-to-end dimensions are the take-outs used for cut lengths.
- Small bore: socket-welding and threaded forged fittings under ASME B16.11.
- Flanges: type, facing and rating class (150 to 2500 in ASME B16.5, which also covers flange bolting and gaskets).
- Gaskets and bolts: one gasket and one bolt set per flanged joint; the number and size of studs in a set come from the flange standard's tables for that size and class. Metallic gaskets for those flanges are covered by ASME B16.20.
- Valves and specialty items: usually identified by tag, bought from the valve list or the specialty item list rather than as a commodity; the iso shows where they sit and what their flanges need.
Continuations
A line longer than a sheet continues on another iso, and lines meet at tie-ins. Each continuation is a place where a weld, a flange, a gasket or a length of pipe can be counted on both sheets or on neither. Check every continuation pair, not just each sheet.
MTO and fabrication BOM: two answers to two questions
The MTO says what to buy; the fabrication BOM says what to build. The MTO adds up commodities across every isometric in scope, by item code, size and class, in purchase units. The fabrication BOM keeps each isometric apart and breaks it into spools, pieces and welds. Same drawings, same items, different grouping, different reader, and a different error when it goes wrong.
| Material take-off (MTO) | Fabrication BOM | |
|---|---|---|
| Question it answers | What do we buy, and what does it cost? | What do we build, piece by piece, and where? |
| Who reads it | Estimating, procurement, project controls | Methods, the fabrication shop, the erection crew |
| Grouped by | Commodity: item code, size, class, rating, across every iso in scope | Drawing, then spool, then piece |
| Pipe | Total length by size, class and wall | Each cut length, with its end preparation |
| Welds | Not material; counted separately for labour if the estimate needs them | Every weld, numbered, shop or field, with its size and type |
| When it exists | Early, from layouts; then from the isos, revised with them | Once fabrication isos with spool breaks are issued |
| What breaks it | A missed line, a spec break on the wrong side, double counting at a continuation | A wrong take-out, a weld in the wrong place, a spool too large to ship |
The fabrication bill of materials and the MTO are often produced by different teams from the same isos, and drift apart at the first revision. Producing both from one reading of the drawing, with each line traced to the same sheet, is what keeps them consistent.
Building the MTO
- List the isos in scope from the line list and the P&IDs, at their current revision. Any line with no iso is a gap to report, not a zero.
- Read each iso's material list, then check it against the drawing itself: count the elbows, flanges and joints you can see, and compare. A material list can be wrong.
- Check every item against its piping class: size range, schedule or wall, rating, facing, valve code. An item the class does not allow is a design question, not a takeoff decision.
- Apply the project rules: who supplies gaskets and bolts at equipment nozzles, at tie-ins and at spec breaks; which tagged items come with other packages.
- Roll up by item code, size and class across all isos, keeping net quantities. Allowances go in a separate column (see below).
- Add what is not material but is priced from the same drawings, if the estimate needs it: weld counts by size and type, support counts by type, insulated lengths, paint surface.
Weight and paint surface are computed, not counted: pipe weight from the length and the weight per metre for its size and wall, paint surface from the outside diameter times the length, plus whatever rule your painting specification sets for fittings and flanges.
Building the fabrication BOM: spools, cut lengths, welds
A spool is a prefabricated assembly of pipe, fittings and flanges, welded in the shop and connected on site by a field weld or a bolted joint. The fabrication isometric shows where spools break and marks field welds. Where they break is a methods decision: transport and handling limits, access on site, and where a field weld can be made and examined.
Cut lengths
A pipe piece's cut length is the dimension between the two points it connects, minus the take-out of each component at its ends: the centre-to-end dimension of an elbow, the length through the hub of a weld neck flange, and so on, from the dimensional tables. Shops then adjust for the root gap of each weld and any field-fit extra length on pieces next to a field weld, by their own procedure.
Welds and what follows them
Each weld gets a number, a size, a type (butt, socket, branch) and a place (shop or field). That list is what welding, examination and the weld log run on. The extent of examination each weld receives is set by the applicable code and the project specifications, not by the takeoff: process piping under ASME B31.3 has examination, inspection and testing within the code's scope, and the requirements depend on the service. The takeoff's job is to make every weld countable and attributable to its spool, so that the examination plan can be applied to it.
Worked example: one isometric, rolled up twice
Illustrative example, invented figures: isometric ISO-1204-01, line 6"-P-1204-A1-IH50, revision B
Assumptions, all invented. Piping class A1 is carbon steel, class 150 raised face. The line leaves a pump discharge nozzle with a weld neck flange (F1), rises 1,500 mm to an elbow (E1), runs 2,000 mm to a flanged gate valve (flanges F2 and F3), runs 1,800 mm to a second elbow (E2), turns and runs 6,000 mm to a third elbow (E3), with a 2" drain on that run, and ends 1,200 mm later on a weld neck flange (F4) bolted to an existing header. Dimensions are to elbow centres and flange faces. Project rule: the iso that shows a flanged joint to equipment or to an existing line carries its gasket and bolt set.
| Pt | Description | Size | Qty | Item code |
|---|---|---|---|---|
| 1 | Pipe, seamless, carbon steel, BE, Sch 40 | 6" | 10.8 m | A1-PIP-06 |
| 2 | Pipe, seamless, carbon steel, BE, Sch 80 | 2" | 0.2 m | A1-PIP-02 |
| 3 | Elbow 90 LR, buttweld, Sch 40 | 6" | 3 | A1-ELL-06 |
| 4 | Weldolet, Sch 80 outlet | 6" x 2" | 1 | A1-WOL-0602 |
| 5 | Flange, weld neck, RF, class 150, Sch 40 bore | 6" | 4 | A1-FWN-06 |
| 6 | Flange, weld neck, RF, class 150, Sch 80 bore | 2" | 1 | A1-FWN-02 |
| 7 | Gate valve, flanged RF, class 150 | 6" | 1 | A1-VGA-06 |
| 8 | Gate valve, flanged RF, class 150 | 2" | 1 | A1-VGA-02 |
| 9 | Blind flange, RF, class 150 | 2" | 1 | A1-FBL-02 |
| 10 | Gasket, spiral wound, class 150 | 6" | 4 | A1-GSK-06 |
| 11 | Gasket, spiral wound, class 150 | 2" | 2 | A1-GSK-02 |
| 12 | Stud bolt set with nuts, class 150 | 6" | 4 sets | A1-BLT-06 |
| 13 | Stud bolt set with nuts, class 150 | 2" | 2 sets | A1-BLT-02 |
The check against the drawing. Four 6" flanged joints are visible (nozzle, valve inlet, valve outlet, tie-in), so four gaskets and four bolt sets; two 2" joints (flange to drain valve, valve to blind). Three elbows, four 6" weld neck flanges, one weldolet. The list agrees with the drawing. The line list, though, gives insulation IH50 while the iso title block says none: that is held for the engineer, not resolved by the takeoff.
| Item code | Description | Size | Qty | Unit | Source | Status |
|---|---|---|---|---|---|---|
| A1-PIP-06 | Pipe, smls, CS, BE, Sch 40 | 6" | 10.8 | m | ISO-1204-01 rev B, pt 1 | Counted |
| A1-PIP-02 | Pipe, smls, CS, BE, Sch 80 | 2" | 0.2 | m | pt 2 | Counted |
| A1-ELL-06 | Elbow 90 LR, BW, Sch 40 | 6" | 3 | ea | pt 3 | Counted |
| A1-WOL-0602 | Weldolet, Sch 80 outlet | 6" x 2" | 1 | ea | pt 4 | Counted |
| A1-FWN-06 | Flange WN RF cl 150 | 6" | 4 | ea | pt 5 | Counted |
| A1-FWN-02 | Flange WN RF cl 150 | 2" | 1 | ea | pt 6 | Counted |
| A1-VGA-06 | Gate valve RF cl 150 | 6" | 1 | ea | pt 7, P&ID tag checked | Counted |
| A1-VGA-02 | Gate valve RF cl 150 | 2" | 1 | ea | pt 8 | Counted |
| A1-FBL-02 | Blind flange RF cl 150 | 2" | 1 | ea | pt 9 | Counted |
| A1-GSK-06 | Gasket SW cl 150 | 6" | 4 | ea | pt 10: nozzle, valve x2, tie-in | Counted |
| A1-GSK-02 | Gasket SW cl 150 | 2" | 2 | ea | pt 11 | Counted |
| A1-BLT-06 | Stud bolt set cl 150 | 6" | 4 | set | pt 12 | Counted |
| A1-BLT-02 | Stud bolt set cl 150 | 2" | 2 | set | pt 13 | Counted |
| PS-01 | Pipe shoe, standard support | 6" | 2 | ea | support tags on the iso | Counted |
| PG-02 | Guide, standard support | 6" | 1 | ea | support tag on the iso | Counted |
| Insulation | Line list: IH50; iso title block: none | 6" | m | line list rev 3 vs iso rev B | Held: engineer |
With more isometrics in scope, each row above is summed with the same item code from the other sheets, and the source column lists every sheet that contributes to it. Paint surface for the straight pipe is the outside diameter times the length: 6" pipe (168.3 mm outside diameter) over 10.77 m of cut pipe gives 5.69 m², and the 2" nipple 0.03 m².
The fabrication BOM. The methods engineer puts one field weld (FW1) in the middle of the 6,000 mm run, 3,000 mm from each elbow centre, and the valve's bolted joints break the line naturally. Take-outs used here: 229 mm for the 6" long radius elbow, 89 mm for the 6" weld neck flange; weld gaps are ignored.
| Spool | Pipe pieces (mm) | Components | Shop welds | Field welds |
|---|---|---|---|---|
| S1 | P1 1,182; P2 1,682 | F1, E1, F2 | W1 F1-P1, W2 P1-E1, W3 E1-P2, W4 P2-F2 (four 6" butt) | None |
| S2 | P3 1,482; P4a 2,771 | F3, E2 | W5 F3-P3, W6 P3-E2, W7 E2-P4a (three 6" butt) | FW1 P4a-P4b (6" butt) |
| S3 | P4b 2,771; P5 882; 2" nipple 150 | E3, F4, weldolet, 2" WN flange | W8 P4b-E3, W9 E3-P5, W10 P5-F4 (three 6" butt); W11 weldolet on P4b (branch); W12, W13 (two 2" butt) | None |
| Loose | Valves pt 7 and 8, blind pt 9, gaskets, bolt sets, supports | Installed at erection |
Cut lengths: P1 = 1,500 − 89 − 229 = 1,182; P2 = 2,000 − 229 − 89 = 1,682; P3 = 1,800 − 89 − 229 = 1,482; P4a and P4b = 3,000 − 229 = 2,771 each; P5 = 1,200 − 229 − 89 = 882. Together 10,770 mm, which the iso's 10.8 m covers. That reconciliation between the spool BOM and the material list is worth running on every iso.
| Weld type | Count | Weld numbers |
|---|---|---|
| Shop, butt, 6" | 10 | W1 to W10 |
| Shop, butt, 2" | 2 | W12, W13 |
| Shop, branch, 6" x 2" | 1 | W11 |
| Field, butt, 6" | 1 | FW1 |
Allowances
Most companies add allowances to the net quantities: on pipe for cutting and nesting losses, on small items such as gaskets and bolts for loss on site, sometimes on the whole MTO at early design stages for growth. These are company practice, not values from a standard, and they vary with the stage of design, the material, the supplier's lengths and the site. This guide gives no percentage for that reason.
- Keep the net quantity from the drawings and the allowance in separate columns.
- Write the rule next to the number: which commodity, which rate, which design stage.
- Apply allowances after the roll-up, not on each iso, so they do not compound.
- Remove growth allowances as the design firms up, and say when you did.
- Treat pipe nesting separately: whether the cut lengths fit in the lengths you buy is a cutting plan, not a percentage.
Revisions and stock already ordered
An isometric is revised many times between first issue and construction. Each revision has to answer three questions: what changed on the drawing, what changes in the MTO, and what that means for material already ordered and spools already fabricated. A new total is not enough; the delta is what procurement and the shop act on.
Illustrative example, invented figures: revision C of ISO-1204-01 moves the tie-in
Revision C moves the header tie-in, and the last run grows from 1,200 mm to 1,700 mm. P5 becomes 1,700 − 229 − 89 = 1,382 mm, the cut pipe 11,270 mm, and the material list 11.3 m. Procurement had ordered the 6" pipe for this iso as two 6 m lengths.
| Item | Rev B | Rev C | Delta | Already ordered | Status |
|---|---|---|---|---|---|
| A1-PIP-06, pipe 6" Sch 40 | 10.8 m | 11.3 m | +0.5 m | 2 lengths of 6 m (12.0 m) | Covered: nests in the same two lengths |
| Every other counted item | As rev B | As rev B | 0 | No change | |
| Spool S3 | Rev B | Rev C | P5 882 to 1,382 mm | Fabricated? check with the shop | Held: methods |
The delta of +0.5 m does not mean a new purchase: the cut lengths still nest in the two lengths ordered (2,771 + 2,771 = 5,542 mm in one, 1,182 + 1,682 + 1,482 + 1,382 = 5,728 mm in the other, saw cuts and end preparation ignored). Only spool S3 changes; S1 and S2 can be fabricated as issued. Paint surface follows the length, from 5.69 m² to 5.96 m² for the 6" pipe. Whether S3 is already in the shop is the one question for a person.
Comparing the drawings themselves, sheet by sheet, is a separate step covered in the guide to drawing revision comparison.
Traceability and engineer control
Every quantity in the MTO should lead back to the isometric, the revision and the material list line it came from, and every spool BOM line to the same. When a buyer asks why 11.3 m of 6" pipe is on a requisition, the answer is a list of sheets, not a spreadsheet formula. Record, for each MTO line:
- Each contributing iso, its revision and the material list part number
- The quantity from each, and any rule applied (scope split, spec break, continuation)
- Allowances, kept apart, with their rule
- Flags raised and who closed them, with the decision
- The MTO revision it belongs to, and the delta against the previous one
The engineer's role changes from counting to deciding. What should always reach a person: spec breaks and joints at continuations, conflicts between the iso, the line list and the class, items supplied by other packages, spool breaks, allowances, and the sign-off of each MTO revision before it is issued to procurement.
Preparing a pilot
Whether the takeoff is done by a new team, a new tool or a service, test it on drawings you have already taken off, against an answer you trust. The guide to running a document automation pilot covers the general method; for piping:
- Choose a closed project whose MTO was checked and used for purchasing: that MTO is the reference.
- Pick a sample of its isometrics that covers each piping class and size range, simple runs and complex ones (branches, reducers, spec breaks, continuations), and at least one poor scan if your drawings include them.
- Include at least one revised iso with both revisions, to test the delta.
- Write the project rules down first: scope splits, joints at continuations, allowance columns, what counts as a match.
- Compare line by line and classify each difference: takeoff error, error in the reference, or an ambiguity in the drawing.
| Measure | Definition | Why |
|---|---|---|
| Line agreement | MTO lines matching the reference on item code, size and quantity, divided by reference lines; missing and extra lines reported apart | Agree first whether a 0.1 m difference on pipe counts as a match |
| Quantity difference by commodity | Pipe metres, fitting and flange counts, gaskets and bolt sets, valves, welds, each against the reference | Shows which commodity drifts, not just how many lines |
| Flags that were right | Flags an engineer confirmed as real issues, divided by all flags raised | Too many false flags cost the time the takeoff saved |
| Engineer time | Time to review and sign off an iso, against the time the team spends taking it off today | Measured on the same isos, by the same people |
Where Mirage fits
Mirage built an engineering takeoff platform for John Cockerill, whose estimating and method teams in Morocco read piping, boilermaking and structural steel drawings for every quote. According to the case study, the piping (ISO) takeoff module is in production and used directly by the estimating team. It reads the isometrics and separates two outputs from the same drawing: MTO quantities for purchasing and costing (bar stock, elbows, flanges, weight, paint surface area) and a BOM for the method and fabrication teams, drawing by drawing, with shop welds and field welds apart. Each output is traceable to the drawing it came from, and John Cockerill's engineers validate the quantities instead of measuring them.
The case study's figures describe that deployment only: 80 to 90 percent less time on piping takeoff, which used to take 3 to 4 days per project, and a fabrication bill of materials about ten times faster, where the method team used to rebuild a 3D model first, a step that could take up to a month. The boilermaking and structural steel modules are built on the same engine and are listed as rolling out next, as is extending MTO and BOM automation to further drawing types; they are not described as in production.
For the Mirage workflow itself, what it reads and returns, see piping takeoff software for isometrics and P&IDs; for the contractors it is built for, the page on MTO and bills of materials for EPC and MEP contractors.
Questions readers ask
Only a preliminary one. A P&ID gives the lines, the valves, the inline items and the spec breaks, but not the route, so pipe lengths, elbows and supports have to be estimated from plans or layouts. The quantities firm up once the isometrics are issued.
The project decides, and the rule must be written down before anyone counts: for example, the iso that shows the flanged connection carries its gasket and bolt set. Without a rule, the same joint is counted twice or not at all, and the error repeats at every continuation in the set.
It is the starting point, not the answer. It still has to be checked against the drawing, the piping class and the line list, and rolled up across isos. At John Cockerill, the case study notes that the nomenclatures on the 2D drawings regularly had omissions or manual counting errors.
Keep them visible either way: the net quantity from the drawings in one column, the allowance in another, and the rule that produced it. Folding them into one number makes the next revision impossible to compare.
From the isometrics, by size, type (butt, socket, branch) and place (shop or field), because each costs differently. Many estimators also convert them into a single unit such as inch-diameters; how branch welds count in that unit is a convention to agree on, not a standard.
Sources and scope
Checked on . Scope: the standards are cited for their published scope only, from the standards bodies' own catalogue pages; no clause, table value or examination requirement is quoted from them. The method, tables and examples are Mirage's own, with invented figures; the John Cockerill facts are quoted from its case study.
- ASME, B31.3 Process Piping: the code's scope: piping in refineries, chemical, power and related plants; materials, design, fabrication, examination, inspection and testing
- ASME, B16.5 Pipe Flanges and Flanged Fittings: rating classes 150 to 2500; flange bolting, gasket and joint requirements
- ASME, B16.9 Factory-Made Wrought Buttwelding Fittings: dimensions, tolerances, ratings and marking of buttwelding fittings, NPS 1/2 to 48
- ASME, B16.11 Forged Fittings, Socket-Welding and Threaded: socket-welding and threaded forged fittings and their classes
- ASME, B16.20 Metallic Gaskets for Pipe Flanges: ring-joint, spiral-wound and jacketed gaskets for B16.5 flanges
- ASME, B36.10 Welded and Seamless Wrought Steel Pipe: standard dimensions of wrought steel pipe, the source of outside diameters and walls by schedule
- ISO 6412-2:2017, Simplified representation of pipelines, Part 2: Isometric projection: isometric representation as a standardised drawing convention for pipelines
- ISO 10628-1:2014, Diagrams for the chemical and petrochemical industry, Part 1: the classification and content of flow diagrams, the family P&IDs belong to
- Mirage Metrics, John Cockerill case study: every John Cockerill fact and figure on this page, and the status of each module
Related on this site
- Piping takeoff software: the Mirage workflow that produces the MTO and BOM from isometrics
- John Cockerill case study: piping takeoff in production, with the MTO and the BOM as separate outputs
- Automated fabrication BOM: the shop-side output on its own
- Information take-off (ITO): quantities and attributes from P&IDs and isometrics together
- AI for EPC and MEP contractors: MTOs and BOMs across disciplines
- Electrical takeoff from 2D drawings: the same method for the electrical trade
- Drawing revision comparison: finding what changed between two issues of a sheet
- Automated ITO and AI quantity takeoff: how automated takeoff works across trades
Send us a set of isometrics you have already taken off
Send a sample of isometrics with the line list, the piping class and the MTO your team produced. We return the MTO and the spool BOM from the drawings, every line traced to its sheet and revision, with the differences against yours explained one by one.
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