An industrial pipefitter installs and maintains the process piping inside refineries, chemical plants, power stations and similar heavy facilities — pipes that may carry chemicals, acids and gases, and, on the steamfitter side, liquids and gases at high pressure.
This page covers the industrial side of the trade: the facilities, the pipe and pressure work, the hiring tests and site-access credentials, and what the work pays.
What is industrial pipefitting?
Industrial pipefitting is the heavy-industry side of the pipefitting trade: installing and maintaining the pipes that keep refineries, chemical plants, power stations and similar facilities running.
The Bureau of Labor Statistics (BLS) describes pipefitters and steamfitters as installing and maintaining pipes that may carry chemicals, acids, and gases, mostly in manufacturing, commercial, and industrial settings — and steamfitters as specializing in systems for liquids or gases at high pressure.
There is no separate federal occupation called "industrial pipefitter."
O*NET merged the old pipe fitter and plumber codes into one occupation, 47-2152.00 Plumbers, Pipefitters, and Steamfitters, and the combined occupation explicitly includes sprinkler fitters too; its sample titles run from Pipefitter and Pipe Welder to Plumber and Drain Technician.
The practical consequence runs through this page: every federal pay and outlook figure covers the whole combined trade, not industrial fitters alone.
Steam is the industrial end of the trade's vocabulary.
The United Association (UA), the piping trades' union, describes its steamfitters as fabricating, installing, maintaining, and repairing high-pressure systems that move steam, hot water, and other industrial fluids — including chilled water and compressed air — with work that includes welding, rigging, and hydrostatic and pneumatic testing.
If you are new to the trade itself, the pipefitter career guide covers the whole occupation — settings, duties and the helper-to-foreman ladder — before you specialize.
Refineries, chemical and power plants
The facilities carry names you would expect: petroleum refineries and petrochemical plants, chemical plants, fossil and nuclear power stations, pharmaceutical plants.
Piping there moves feedstocks, steam, cooling water and process chemicals from one piece of process equipment to another.
The industry table shows where the occupation actually sits.
In May 2025 the industries employing the most Plumbers, Pipefitters, and Steamfitters were building equipment contractors (340,140 workers), utility system construction (14,960), and local government excluding schools and hospitals (11,480).
None of the facility industries named above appears in that group — a point that matters when you read the pay table in the pay section below.
The metro areas with the most jobs in the occupation in May 2025 were New York-Newark-Jersey City (21,040), Los Angeles-Long Beach-Anaheim (15,690), Chicago-Naperville-Elgin (12,750), Dallas-Fort Worth-Arlington (11,980), and Houston-Pasadena-The Woodlands (10,980) — counts for the whole combined occupation, not for industrial fitters alone.
Across that occupation, BLS projects 6.8% employment growth from 2025 to 2035, against a 3.5% average across all occupations, with about 42,000 openings a year.
The work also has a scheduling vocabulary: shutdowns and turnarounds, the industry's terms for windows when process units come offline.
The sources we checked carry no data on how often such windows run or how much of the year's piping work they carry, so we will not characterize the schedule — for the reality on a given job, the employer and the posting are the source.
Nuclear plants layer their own access program on top, covered with the other site credentials below.
Materials and pressure classes
What the pipe carries decides what the pipe must be.
The BLS scope — pipes that may carry chemicals, acids, and gases — is the industrial short list: corrosive process lines, high-pressure steam, and the feed and return runs around equipment that operates hot, under pressure, or both.
The trade's own descriptions stay inside that frame: BLS has steamfitters specializing in systems for liquids or gases at high pressure, and the United Association describes its steamfitters as fabricating, installing, maintaining, and repairing high-pressure systems — with welding, rigging, and hydrostatic and pneumatic testing in the work.
The trade's paper reference carries the same industrial pedigree.
The Pipe Fitters Blue Book is published by Graves Publishing Company, and its author, W.V.
"Duffy" Graves, was a pipe fitter foreman at Shell Chemical who went on to teach pipe fitting at Lee College in Baytown, Texas.
As for the specifics — schedules, alloys, pressure classes, joint types — this page deliberately lists none.
Those values come from the specifications on each project, and our research vault does not carry a materials table we could responsibly reprint.
The one structure we can cite is craft training: NCCER's Pipefitting curriculum is organized in four levels, Level 1 through Level 4.
The next section takes up the hiring side.
Hiring tests and safety quals (TWIC)
Two kinds of checks come up on the way into industrial work: entry testing on the way into the trade, and credentials on the way onto the site.
Entry testing is its own subject — our pipefitter aptitude test guide covers what those screens look like and how to prepare.
On the craft-training side, NCCER's Pipefitting curriculum is organized in four levels, Level 1 through Level 4, and our NCCER pipefitter test guide explains how the training and assessments fit together.
Site access is the industrial layer.
A TWIC — Transportation Worker Identification Credential — is required under the Maritime Transportation Security Act for workers who need access to secure areas of maritime facilities and vessels, and the Transportation Security Administration runs a background check before issuing it.
Where the job means access to secure areas of a maritime facility, the credential is part of mobilization, so read the posting and ask the contractor what access credentials the site requires before you commit.
Nuclear power plants have their own access layer.
Workers seeking unescorted access to protected or vital areas must be covered by the licensee's access authorization program, including a background investigation, under Nuclear Regulatory Commission rule 10 CFR 73.56.
The access authorization program is the licensee's, so the specifics are set per site.
One adjacent corner we cannot verify: offshore and marine certifications.
Our research did not confirm the training requirements for offshore piping work, so we will not list them — if you are chasing offshore or shipyard calls, ask the contractor exactly which certifications and medical checks the job requires.
Access rules are set by the facility and the agencies behind them
Pay and per diem
Start with the honest benchmark.
The federal data has no industrial-pipefitter line: Plumbers, Pipefitters, and Steamfitters (SOC 47-2152) earned a median of $30.67 an hour, or $63,800 a year, in May 2025 per the BLS Occupational Employment and Wage Statistics survey (OEWS, released May 15, 2026), and the 90th percentile was $52.13 an hour ($108,420 a year).
State and metro tables live on our pipefitter salary page.
The industry view comes closest to the industrial question.
In May 2025 the highest-paying industries for the occupation by annual median wage were electric power generation, transmission and distribution at $115,310, petroleum and coal products manufacturing at $106,550, and pharmaceutical and medicine manufacturing at $105,800 — all measured on the same SOC and the same survey as the $63,800 occupation median.
Two limits travel with those numbers: each median covers the whole combined occupation in that industry, plumbers and steamfitters included, and none of the three is among the industries employing the most of the occupation.
Read them as niche, occupation-wide industry benchmarks — not as an industrial-pipefitter pay rate.
Per diem works differently from the hourly side — and there is no verified "typical" amount.
We found no BLS or DOL series for what contractors pay traveling fitters; on union calls per diem and subsistence are set in each local's agreement, and on open-shop jobs the employer sets its own.
The one line the IRS draws is a limit, not a rate: a single-location assignment realistically expected to last more than 1 year is "indefinite," that location becomes your tax home, and living allowances become taxable income even when they are called travel allowances — the trap on long plant jobs that keep extending.
Our pipefitter per diem guide covers the tax rules and the federal benchmark rates in full.
Career and pay information, not legal or tax advice — the tax treatment of travel allowances turns on your employer's plan and your own situation, so confirm yours with a tax professional.
What the BLS figures include