How do you calculate fit-up labor for a pressure vessel?

Multiply the number of fit-up joints by your fully burdened per-joint rate, apply a productive-time factor, then add the fixed rigging charge. With 100 joints at $45, an 80% factor and $250 rigging, the total is $3,850, or $38.50 per joint.

What counts as a fit-up joint?

Any alignment-and-tack operation: longitudinal and circumferential shell seams, head-to-shell joints, and set-in internals like trays, baffles or supports. Count each discrete set-and-tack task, since each consumes layout, jacking and inspection time.

Why separate fit-up labor from welding labor?

Fit-up and welding scale differently and are often done by different crews. Isolating fit-up lets you see whether alignment and rigging - not arc time - are driving your assembly hours, which is common on out-of-round or thin-wall shells.

What is a good per-joint fit-up cost?

It depends on diameter and thickness, but the $38.50 per joint here is typical for moderate shell work. Heavy-wall or large-diameter seams that need jacks, strongbacks and re-rounding can run several times that.

How does the productive-time factor affect fit-up estimates?

Fit-up has a lot of non-arc time - measuring, jacking, re-checking roundness. The 80% factor trims the raw $4,500 to $3,600 of captured value to reflect that only part of clocked time is productive alignment work.

Fit-up labor vs nozzle labor - how do they differ?

Fit-up labor covers aligning and tacking the main pressure boundary and internals; nozzle labor is specific to penetrations. They share the tack step, but nozzle work adds hole cutting and pad fitting that a fit-up estimate does not include.

Tank, Vessel & Pressure Equipment Fabrication calculator

Fit-Up Labor Calculator

Fit-Up Labor estimates the shop cost of aligning, gapping and tacking the shell courses, heads and internals of a tank or pressure vessel before final welding. Fit-up is the quiet driver of vessel labor: poor alignment, bad root gaps or out-of-round shells create rework that cascades into welding, NDE and even hydrotest. Estimators and fabrication leads use this to price the tack-and-set stage and to reserve realistic hours for rigging and jacking. Because fit-up quality sets up every downstream weld, underquoting it is one of the fastest ways to erode margin.

What this calculator does

Fit-Up Labor estimates the shop cost of aligning, gapping and tacking the shell courses, heads and internals of a tank or pressure vessel before final welding.
Use it when fit-up labor in tank, vessel and pressure equipment fabrication is being put through a tank, vessel and pressure equipment fabrication weighted-cost review.
It multiplies fit-up joint count by a fully burdened per-joint rate, applies a productive-time factor, then adds a fixed rigging and tooling charge for total and per-joint cost.

Formula used

Fit-Up Labor cost = quantity × rate × capture factor + fixed cost
Per-unit fit-up labor = total cost ÷ quantity

Inputs explained

Fit-up joints to complete:
Fully burdened labor rate per joint:
Productive fit-up time factor:
Fixed rigging and tooling charge:

How to use the result

Use it when quoting the assembly stage or re-estimating after a design change adds seams, internals or tight tolerances.
It assumes joints of similar difficulty; a rolled shell longitudinal seam and a heavy set-in internal support carry very different fit-up hours.

Current U.S. benchmarks

U.S. iron and steel imports ran $2.1B in May 2026 (Census International Trade). The U.S. ran a trade deficit of $0.4B in the category that month. Import volumes are the pressure gauge behind tariff and reshoring decisions.
Steel mill PPI stands at 348.53 (BLS, May 2026), up 6.7% from a year earlier. New factory orders are up 2.3% year over year (Census).
The U.S. has 53,790 fabricated metal products establishments employing about 1,441,471 workers (Census County Business Patterns, 2023).

Common questions

How do you calculate fit-up labor for a pressure vessel? Multiply the number of fit-up joints by your fully burdened per-joint rate, apply a productive-time factor, then add the fixed rigging charge. With 100 joints at $45, an 80% factor and $250 rigging, the total is $3,850, or $38.50 per joint.
What counts as a fit-up joint? Any alignment-and-tack operation: longitudinal and circumferential shell seams, head-to-shell joints, and set-in internals like trays, baffles or supports. Count each discrete set-and-tack task, since each consumes layout, jacking and inspection time.
Why separate fit-up labor from welding labor? Fit-up and welding scale differently and are often done by different crews. Isolating fit-up lets you see whether alignment and rigging - not arc time - are driving your assembly hours, which is common on out-of-round or thin-wall shells.
What is a good per-joint fit-up cost? It depends on diameter and thickness, but the $38.50 per joint here is typical for moderate shell work. Heavy-wall or large-diameter seams that need jacks, strongbacks and re-rounding can run several times that.
How does the productive-time factor affect fit-up estimates? Fit-up has a lot of non-arc time - measuring, jacking, re-checking roundness. The 80% factor trims the raw $4,500 to $3,600 of captured value to reflect that only part of clocked time is productive alignment work.

Last reviewed 2026-05-12.