AI Visibility Index: Tanks & Pressure Vessels in Pennsylvania

When a buyer asks an AI assistant for a tanks & pressure vessels supplier in Pennsylvania, these are the companies that get named. This is what we found when the cell was last measured.

173 companies tracked
Last measured September 30, 2026
Next measurement October 30, 2026

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The headline numbers

Never named by AI

154 of 173

companies never appeared in a single buying question

They were asked the same 5 buying questions as everyone else in this cell and were not named once.

19 named at least once
154 never named

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Cell average: 0.47of 15
Across all 173 tracked companies.
Top ten average: 7.2of 15
The ten most visible companies in the cell.

A company's score is how many of the 15 measured answers named it.

The top ten in Pennsylvania

These are the companies AI assistants named most often when Pennsylvania buyers went looking for a supplier in this category.

Top 10 most AI-visible Tanks & Pressure Vessels companies in Pennsylvania, measured September 30, 2026
Rank	Company	Location	AI visibility
1	Witherup Fabrication and Erection 50 employeesKennerdell, Pennsylvania 2 name variants Witherup Fabrication & Erection, Inc.most common7 Witherup Fabrication & Erection4	Kennerdell, Pennsylvania	11 of 15 answers
2	GSM Industrial 22 employeesLancaster, Pennsylvania 2 name variants GSM Industrialmost common9 GSM Industrial, Inc.1	Lancaster, Pennsylvania	10 of 15 answers
3	Hetrick Manufacturing, Inc. 9 employeesNew Kensington, Pennsylvania 3 name variants Hetrick Mfg., Inc.most common6 Hetrick Manufacturing, Inc.2 Hetrick Manufacturing1	New Kensington, Pennsylvania	9 of 15 answers
4	R-V Industries Inc. 25 employeesHoney Brook, Pennsylvania 2 name variants R‑V Industries, Inc.most common6 R‑V Industries2	Honey Brook, Pennsylvania	8 of 15 answers
5	Stoystown Tank & Steel Co. 9 employeesStoystown, Pennsylvania	Stoystown, Pennsylvania	8 of 15 answers
6	Allegheny Bradford Corporation 50 employeesLewis Run, Pennsylvania 2 name variants Allegheny Bradford Corporationmost common6 Allegheny Bradford Corp.1	Lewis Run, Pennsylvania	7 of 15 answers
7	Penn Manufacturing, Inc. Pennsylvania	Pennsylvania	7 of 15 answers
8	American Alloy Fabricators 50 employeesNorristown, Pennsylvania 2 name variants American Alloy Fabricators, Inc.most common2 American Alloy Fabricators2	Norristown, Pennsylvania	4 of 15 answers
9	Custom Engineering Co. 50 employeesErie, Pennsylvania 2 name variants Custom Engineering Co.most common3 Custom Engineering Company1	Erie, Pennsylvania	4 of 15 answers
10	Highland Tank & Manufacturing Company 150 employeesManheim, Pennsylvania	Manheim, Pennsylvania	4 of 15 answers

17 more companies were named at least once. Companies outside the top ten are counted in the averages but not named here.

Also named, based in another state

AI assistants named these companies too, but MacRAE'S lists them in a different state, not Pennsylvania. They belong to that state's ranking, not this one.

Company	State	Mentions
AES, LLC	California	3 of 15
MP&C (Membrane Process & Controls)	Wisconsin	2 of 15
Highland Tank & Manufacturing Co.	New York	1 of 15

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The five questions we asked

Every company in this cell is measured on the same questions, written the way a buyer would type them. That is what makes the ranking a comparison rather than a collection of anecdotes.

1“Best suppliers of tanks and pressure vessels in Pennsylvania”
2“Who supplies ASME-certified stainless steel process pressure vessels in Pennsylvania”
3“I need a Pennsylvania tank and pressure vessel partner for a custom chemical processing line, who should I talk to”
4“Top tanks and pressure vessels suppliers in Pennsylvania for chemical plant engineering buyers”
5“Which Pennsylvania tank and pressure vessel fabricators can handle large-diameter, high-pressure reactor vessels”
6“List 20 tanks and pressure vessels companies in Pennsylvania with their specialties.”the roster question

Each question is asked more than once, which is why a company's score is out of 15 answers rather than out of the number of questions.

Where AI drew its answers from

These are the sources the answers in this cell leaned on most, ranked by how many of the named companies each one stands behind.

hetrickmfg.com
3 companies
gsmindustrial.com
2 companies
rvii.com
2 companies
witherup.com
2 companies
alleghenybradford.com
2 companies
americanalloyfab.com
2 companies
eaglestainless.com
2 companies
customeng.com
2 companies
sharpsvillecontainer.com
2 companies
aess.us
1 company
highlandtank.com
1 company
pghtank.com
1 company

44 sources were cited across this cell's answers from 31 domains. A directory page often stands behind several companies at once; a company's own site usually stands behind one.

Pennsylvania in context

Pennsylvania ranks 9th of 17 measured states in this category. Each bar is the share of that state's tracked companies that AI assistants named at least once; across every measured state in this category the share is 10%.

Pennsylvania (this report)Other measured statesCategory average (10%)

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