Engineering | Procurement | Construction Management | Fabrication | Construction | Maintenance

The strongest thing we build is your trust.

We are experts in professional engineering, design and drafting services to ensure that your vessels are designed and manufactured to current ASME code standards.

Mitternight was originally engaged in the repair of boilers and related products.  The focus of the Company began to evolve in the mid-1960s.  Today, Mitternight is a manufacturer of ASME-code vessels, including heat exchangers, chemical reactors, distillation columns and other pressure vessels, utilizing materials ranging from carbon steel to titanium.

Our History


We employ top professional estimators with years of experience. Our estimates will be accurate and returned to you on time.


We offer professional engineering services to ensure that your vessels are up to current ASME code standards.


The Mitternight scheduling department develops and maintains an Integrated Master Schedule to ensure timely project execution.

Pressure Vessels

Creating pressure vessels is an exacting science. It is a precise blend of engineering, materials, craftsmanship and quality control.

Heat Exchangers

Shell and tube heat exchangers are among our product specialties. Tube sheet drilling is computer-controlled for maximum precision.

Quality Control

At the heart of our vessel fabrication is QC. We work to the strict standards of ASME code ensuring Quality is at the core of every vessel we build.

About us

In 1927 Joe Mitternight opened a boiler repair shop on the Mobile riverfront. It was dedicated to simple values like customer satisfaction and quality production.

Over the years, Mitternight Boiler Works, Inc. has evolved into a modern world class production facility manufacturing ASME Code vessels. These include heat exchangers, chemical reactors, distillation columns and other pressure vessels for Fortune 500 customers around the world.

Today at Mitternight, Inc., you will still find well-trained, highly-experienced people who care about their work. You will also find a production process built around meticulous monitoring and continuous improvement. We deliver quality products on time. That is the essence of Mitternight, and it translates into value for our customers.

All of our departments coordinate efforts to meet the common goal: the goal of getting your vessel back to you when promised, within budget and to your specifications. From estimating through final inspections, our people are dedicated to this purpose.

Today, we successfully handle a far-reaching range of projects from small, intricate work, to jobs that are among the most ambitious and demanding in the industry. But we have never lost sight of our founding principles.

We welcome each challenge presented to us. We welcome yours too.

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