How Atmospheric Storage Tanks Differ — And What Safety Measures Matter Most

Companies across the U.S. rely on atmospheric storage tanks every day, whether they operate in chemical processing, water treatment, or energy production. Yet many companies still struggle with a basic question: How do atmospheric tanks actually differ from other types of storage vessels — and what risks should operators keep in mind?

At Savannah Tank, with manufacturing in Georgia and now in India, we help customers make these decisions early to ensure they receive equipment that performs reliably for decades.

How Atmospheric Storage Tanks Differ From Other Tank Types

Atmospheric storage tanks are built for one main purpose: safely holding liquids at or near ambient pressure. That single requirement drives design choices that differ significantly from those of pressure-rated vessels.

Key Differences You Should Know

1. Operating Pressure

Atmospheric tanks store products at 0 psig. Pressure vessels must manage elevated pressures and therefore require thicker walls, advanced weld designs, and ASME Section VIII certification.

2. Design Codes and Standards

Most atmospheric storage tanks follow API 650 or API 620 guidelines, while pressure vessels follow ASME standards. Companies turn to Savannah Tank for both tank manufacturing in the US and international fabrication support because we engineer each vessel for its specific regulatory environment.

3. Materials for Corrosion and Cost Control

Stainless steel storage tanks offer strong corrosion resistance for aggressive chemicals. Carbon steel, duplex, and specialty alloys are also common. We help customers evaluate each option to balance performance, budget, and lifecycle requirements.

4. Form Factor and Capacity

Since they do not need to resist pressure, atmospheric tanks can be built with larger diameters and higher capacities than pressure vessels. Many plants use them for water, chemical blends, fuels, or general process liquids.

Safety Considerations When Operating Atmospheric Tanks

Even though atmospheric tanks don’t require pressure control, they still demand careful planning and ongoing attention. Failure usually stems from preventable issues — and those issues often start at the design stage.

Key safety factors include the following:

• Operators must use properly sized vents to prevent vacuum or overpressure scenarios caused by filling, emptying, or thermal expansion.

• Choosing the right material — from stainless steel storage tanks to epoxy-lined carbon steel — prevents long-term degradation.

• Atmospheric tanks require stable foundations to support heavy static loads. We ensure engineered support that protects the vessel throughout its service life.

• Customers rely on our rigorous weld inspections, testing, and QA procedures to maintain long-term tank integrity.

• Depending on stored media, operators may need secondary containment, fire suppression systems, or external coatings.

Savannah Tank ensures that each of our projects has safeguards built in. With many years of manufacturing storage tanks to ISO standards, with an emphasis on Quality Control (receiving inspections through final inspections), pressure testing, and communication from start to finish, our goal is to produce the highest-quality tanks available.

Partner With Savannah Tank for Engineered Atmospheric Tanks

Savannah Tank manufactures atmospheric tanks, storage solutions, and engineered solutions to meet industrial needs. Our team will provide ongoing design assistance, timely communication, and on-time delivery of your tanks. With our years of U.S. tank manufacturing experience combined with our expansive global network through our India plant, we ensure reliable product delivery to your facility.

If you're ready to design or upgrade your atmospheric storage tanks, please reach out to Savannah Tank today to discuss your project and have our experts assist you through the entire process, from inception to completion.