AI Visibility Index: Tanks & Pressure Vessels in California

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

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

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The headline numbers

Never named by AI

280 of 289

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.

9 named at least once
280 never named

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Cell average: 0.1of 15
Across all 289 tracked companies.
Top ten average: 5.1of 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 California

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

Top 10 most AI-visible Tanks & Pressure Vessels companies in California, measured September 30, 2026
Rank	Company	Location	AI visibility
1	Alloy Process Equipment, Inc. California	California	9 of 15 answers
2	Custom Tank Fabrication Inc. California 2 name variants Custom Tank Fabrication Inc.most common6 Custom Tank Fabrication2	California	8 of 15 answers
3	ASC Process Systems 25 employeesValencia, California	Valencia, California	7 of 15 answers
4	Hanson Tank 25 employeesLos Angeles, California 3 name variants Hanson Tank (Roy E. Hanson Jr. Mfg.)most common4 Roy E. Hanson Jr. Mfg. (Hanson Tank)1 Hanson Tank (Wendland Mfg.)1	Los Angeles, California	6 of 15 answers
5	Central Valley Tank 17 employeesFresno, California 3 name variants Central Valley Tank of California, Inc.most common2 Central Valley Tank of California1 Central Valley Tanks, Inc.1	Fresno, California	4 of 15 answers
6	Santa Rosa Stainless Steel 45 employeesSanta Rosa, California	Santa Rosa, California	4 of 15 answers
7	Pure Effect, Inc. California	California	4 of 15 answers
8	South Gate Engineering LLC 115 employeesChino, California 3 name variants South Gate Engineering, LLCmost common1 South Gate Engineering1 Southgate Engineering1	Chino, California	3 of 15 answers
9	Diamond Weld Industries Inc. California	California	3 of 15 answers
10	Gee Manufacturing California	California	3 of 15 answers

27 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 California. They belong to that state's ranking, not this one.

Company	State	Mentions
Stainless Process Systems, Inc.	Maryland	8 of 15
Datco Manufacturing	Ohio	2 of 15
Performance Mechanical, Inc.	New Jersey	2 of 15
Advance Tank & Construction	Alabama	1 of 15
Altam, Inc.	Illinois	1 of 15
Altman Manufacturing (Altam Mfg.)	Pennsylvania	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 California”
2“Who supplies ASME-certified stainless steel process pressure vessels in California”
3“I need a California tank and pressure vessel partner for a custom chemical processing line, who should I talk to”
4“Top tanks and pressure vessels suppliers in California for chemical plant engineering buyers”
5“Which California tank and pressure vessel fabricators can handle large-diameter, high-pressure reactor vessels”
6“List 20 tanks and pressure vessels companies in California 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.

thomasnet.comDirectory
7 companies
altammfg.com
4 companies
hansontank.com
3 companies
southgateengineering.com
3 companies
stainlessprocesssystems.com
3 companies
centralvalleytank.com
3 companies
customtankfabrication.com
2 companies
dir.ca.gov
2 companies
ape-incorp.com
1 company
aschome.com
1 company
srss.com
1 company
advancetank.com
1 company

45 sources were cited across this cell's answers from 38 domains. A directory page often stands behind several companies at once; a company's own site usually stands behind one.

California in context

California ranks 17th 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%.

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

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