The Takeoff Handbook

Plain-English answers on P&IDs, line numbers, digitization and reading drawings with AI - everything they never taught you about takeoffs and bidding.

Unit Price Contract: How It Works and How to Bid One | The Takeoff AI

What a unit price contract is, how the bid schedule and unit rates work, who carries the quantity risk, and why checking the owner's quantities matters before you bid.

Weld Map: What It Is and How Welds Get Tracked | The Takeoff AI

What a weld map is, how weld numbering works, what a weld log records, and how the weld count on the map feeds the labor in a piping estimate.

Pipe Rack: What It Is and How to Take One Off | The Takeoff AI

A pipe rack is the elevated steel or concrete structure that carries process and utility piping, cable trays and sometimes equipment across a process plant. It's also called a pipe bridge, p...

Welding Procedure Specification (WPS): What It Is, With PQR and WPQ Explained | The Takeoff AI

What a welding procedure specification is, what goes on one, how a WPS relates to a PQR and welder qualification, what ASME Section IX requires, and what it costs on a bid.

Steam Tracing

Steam tracing runs a small tube along the outside of a process pipe, under the insulation, so heat from the steam keeps the product from cooling, freezing or thickening. The tracer never app...

Jacketed Piping: What It Is and How to Take It Off | The Takeoff AI

Jacketed piping runs a larger outer pipe around the process line so steam or hot oil can circulate between the two and hold the product at temperature. It shows on the drawing as one line, a...

ASME B16.5 Flanges: Classes, Ratings and Sizes | The Takeoff AI

ASME B16.5 is the flange standard published by the American Society of Mechanical Engineers, covering pipe flanges and flanged fittings from NPS (nominal pipe size) 1/2 inch through 24 inch....

Guaranteed Maximum Price (GMP): What It Is and How to Estimate One | The Takeoff AI

A guaranteed maximum price (GMP) is a contract where the owner pays the actual cost of the work plus a fee, up to a ceiling the contractor guarantees. Everything above that ceiling comes out...

ASME B31.3 for Estimators | The Takeoff AI

ASME B31.3, the American Society of Mechanical Engineers code for process piping, decides how much examination, testing, and heat treatment each line carries. This page covers the estimator'...

Butt Weld vs Socket Weld

A butt weld joins two pipe ends edge to edge with a full penetration weld, and a socket weld slips the pipe into a fitting and closes it with a fillet weld around the outside. This page cove...

General Conditions in Construction | The Takeoff AI

What general conditions cover in a construction estimate, how they differ from overhead and general requirements, and how to estimate them from job duration.

Bolt Torque Chart for Flange Bolting | ASME B16.5 | The Takeoff AI

Target torque for A193 B7 stud bolts on ASME (American Society of Mechanical Engineers) B16.5 flanges, worked from bolt size and target stress. Use it to check a bolting procedure or to size...

ASME B16.5 Pressure Classes for Bids | The Takeoff AI

What ASME B16.5 governs, which parts of it produce quantities you can take off, and how bolt and gasket counts get derived from a line spec at bid stage.

Bid Management Software for Estimators | The Takeoff AI

Manage the complete bidding workflow — from bid invitations and RFP review to estimating, subcontractor coordination, and final proposal submission. The Takeoff AI helps contractors identify...

Construction Takeoff Guide for Estimators | The Takeoff AI

A construction takeoff is the count and measure of everything a job needs, pulled from the drawings before anything is priced. What it is, how estimators do it, and what a finished takeoff l...

Weld Joint Types | theTakeoff

Piping labor is priced per weld, so the joint count is the number that carries the estimate. This page covers which connections produce a weld and which do not, how joints get derived at bid...

Flange Bolt Chart

ASME B16.5 and B16.47 flange bolt chart. Stud bolt diameter, quantity, and length by pipe size and pressure class, RF and RTJ, plus how theTakeoff derives every bolt set from the P&ID.

Fabrication Estimating Software

theTakeoff.ai reads your isometrics and structural drawings and counts what a fab shop quotes on, so spools, welds, fittings, flanges, bolt sets and member marks come back against the sheet ...

Estimating Software for Mechanical Contractors

theTakeoff.ai reads your bid package, counts every component, and hands back a takeoff you review line by line before it goes anywhere. Piping is live today, and the rest of the industrial b...

AI Estimating Software

AI estimating software covers three different things that get sold under one phrase, and the accuracy numbers attached to them are close to meaningless without knowing which. This page separ...

Industrial Estimating Software

Industrial estimating software built for process work, where components are specified against codes and a missed spec break costs six figures. This page covers what industrial estimating nee...

PDF Takeoff Software

PDF takeoff software that reads the sheet instead of handing you a ruler. See what free and free download options really are, how scanned drawings are handled, and what the AI does with a fl...

Takeoff and Estimating Software

Takeoff and estimating software covers two jobs that most tools only do one of. This page separates them, shows what each half needs on an industrial package, and says plainly which half the...

Material Takeoff Software

Material takeoff software that reads your drawings and returns the full material list, not just the components you can see on the sheet. This page covers what an automated MTO actually conta...

Construction Takeoff Software and Estimating Tools

Construction takeoff software that reads your drawings and returns the quantities, with a source behind every line. This page covers what quantity takeoff software actually does to a drawing...

Rebar Takeoff

Rebar takeoff that reads the bar schedule and the drawings and returns an auditable count. See where the tonnage actually comes from, how laps and bends change it, and what the AI can and ca...

Piping Estimating Software

Piping estimating software that reads your drawings and returns an auditable count. See what the AI actually does, how the line number becomes a priced line item, and where the estimate stil...

Insulation Takeoff

Insulation takeoff that reads the line list and the drawings, so insulated footage, fittings and equipment come off one read by service, thickness and material, with a source behind every li...

Takeoff Software for Mechanical Contractors

Takeoff software for contractors who self-perform the mechanical scope. Pipe, equipment, supports and in-line instruments come off one read, counted in the units you price in, with a source ...

Drawing Takeoff Software | theTakeoff by ContraVault AI

Drawing takeoff software that reads your drawing set and returns an auditable count. See what the AI actually does, what the free and free download options really are, and which drawing type...

Steel Takeoff Software | theTakeoff by ContraVault AI

Steel takeoff software that reads your drawings and returns an auditable count. See what the AI actually does, what free and free download options really are, and how fabrication and field t...

Structural Steel Estimating Software

theTakeoff reads your steel drawings and returns a takeoff you can audit line by line. Count every member, measure every length, and reconcile the drawings against the schedule and the RFP p...

10 Types of Takeoff in Construction in 2026: The Ultimate Overview

Discover the 10 Types of Takeoff in Construction in 2026 and learn how they impact cost estimation and project efficiency.

P&ID Symbols and Meanings: The Complete Legend

The symbols on a P&ID explained: piping and instrumentation diagram symbols for equipment, lines and signals, valves, and the instrument bubbles and tags, plus what an estimator counts off o...

Which AI takeoff software reads P&IDs and Isometrics in 2026?

Most AI takeoff tools only read architectural floor plans. Here is which ones actually handle P&IDs, Isometrics and industrial drawing sets, and which do not.

Rebar Takeoff : How to Estimate Reinforcing Steel

What a rebar takeoff is, the US rebar sizes and weights, how to measure bars and convert to weight, how to calculate rebar weight, and the laps, hooks and waste that trip up the count. It al...

Oil and Gas Isometric Drawing: How to Read One

How to read a piping isometric on an oil and gas project: the single-line view, the line number, the key elements, the common symbols, and what an estimator pulls off it.

Piping Isometric Drawing Software: What It Does and How to Choose

Here's the "piping isometric drawing software" entry, in your Handbook fields. I wrote it US-lexicon from the start (bid, not tender) and kept it honest about what theTakeoff actually is, si...

MEP Takeoff: Estimating Mechanical, Electrical and Plumbing

What an MEP takeoff is, what quantities get measured from construction drawings, and how mechanical, electrical and plumbing takeoffs are completed, including where AI speeds up the repetiti...

45 degree elbow take off chart

The 45° Elbow Take-Off Chart is a piping reference used by engineers, estimators, and fabricators to determine the center-to-end (take-off) dimension of long-radius 45° elbows. It lists dime...

How to Read P&ID Drawings with AI

Hand a flat drawing to software that recognizes the symbols, pulls the tags, and counts the components at machine speed.

How to Read P&ID Line Numbers

That coded tag on every pipe tells you the size, service, line ID and spec. Learn to read it once and every line on the sheet starts talking.

How to Read a P&ID Diagram

Read the sheet in the right order - legend, equipment, lines, valves, then instrument loops - and the diagram tells its own story.

What Does P&ID Stand For in Engineering?

In engineering, P&ID stands for Piping and Instrumentation Diagram - the controlling reference the whole design traces back to.

Why Digitize Your P&IDs?

Turning flat P&ID drawings into intelligent, machine-readable data - every symbol, line, valve and instrument recognized, tagged and searchable.

What Is a P&ID Diagram?

A schematic that shows how a process system is piped and controlled using standardized symbols instead of scaled drawings.

What Is a P&ID Drawing?

The controlled engineering drawing that shows how one process system is piped and instrumented - every line, valve and instrument, and how they connect.

What Is a P&ID?

The schematic that shows how a process is piped and controlled - every line, valve and instrument, and how they tie together.