Plant Services, Inc

Plant Services, Inc


About Plant services, inc

Tom & Mona

Tom and Mona Thayer

Plant Services, Inc. was founded by Tom Thayer, who had been working in the oil and gas specialty services industries for more than a decade. He and his wife Mona built the company from the ground up, growing from a single office in their home state of Montana to locations throughout the western and southwestern U.S.


Our reputation has been built on our willingness to make tough calls and our ability to solve even tougher problems. We believe in doing things the right way and have built a company that shares our commitment to excellence, because PSI knows that when we treat our people right, they will in turn treat our customers right.

We invest in our employees, utilizing every resource available, training them to analyze and solve critical problems. PSI employees know far more than how to thoroughly seal a leak or successfully complete a hot tap. They know what exceptional service is, and how to ensure both project success and unsurpassed customer satisfaction.


Plant Services, Inc. isn’t the largest service company in the U.S., but we believe that is just one of our many advantages. We have all the tools, equipment and personnel to get your job completed in a safe and timely manner, and we pay attention to every detail. That is why more companies like yours are choosing to work with Plant Services, Inc.

Tom Thayer Picture

Tom Thayer


Thank you for coming to our website. It is my hope that when you put your mouse down and decide to take action for your facility needs, that we’ve given you enough information for you to make PSI your first call for your specialty contracting needs.

I formed PSI to provide a better, more polished product for our customers in the power and petrochemical industries. To provide “old school” service that was based upon a handshake, and where a service company does just that, provide service. Not only provide service, but provide only the best service, with spot-on pricing, punctuality, professionalism and utilizes a “service with a smile” approach. The company, much like myself has modest roots, remains humble in its demeanor and yet is very driven to succeed and be the very best at what we do.

Mike Bosse

Mike Bosse

Lead Technician

Mike has been with PSI since Late 2014, when he moved over to Billings, MT from Chicago to join our work family.

Mike has been working in the petrochemical industry since he was 19 and has developed quite a few specialty skills over the years. Mike’s certified in multiple PSI service lines such as Isolation/Hydros and torqueing and on-stream leak sealing.

“Bosse” as we refer to him, is another part of our very talented and exciting MT crews. Committed, caring and very personable, Mike is a favorite of our customers and is usually asked for by name when they call in for service work. We enjoy seeing Mike’s bright, smiling face every day around here. He just brings joy to everything he does and is a superb member of our Plant Services, Inc. family.

Sean Carney

Sean Carney

National Technical Operations Manager

Sean has over 13 years of specialty contracting experience and has been with PSI for over 10+ years. Sean started in this industry at a very young age, so despite barely being in his 30’s, Sean has collected decades of experience and has earned his right to manage all of PSI’s territory offices. Sean is a life-long Montana native and grew up in the farm fields just outside of Billings right near the PSI corporate office.

Sean has obtained training and certification in just about every service line PSI has to offer. From Leak Sealing to Hot Taps and Line Stops, Sean’s mastery of these services lines is the baseline that provides him the knowledge to lead our offices to provide only the pinnacle of services to our valued customers.

Sean has the unique background in that he apprenticed at PSI while he was in high school. Seeing things literally from the ground up, as well as working his way up with hard work, dedication and a zest for specialty contracting, Sean’s vision for the future of PSI sets us all up for success. Customer service is core to Sean’s beliefs, and he is our cheerleader to our troops that quality customer service is not easy but is worth it every time and is the only service acceptable here at PSI. Give Sean a call and see what he can do for your specialty needs.