How Are Above Ground Storage Tanks Constructed?

Leaks, corrosion, and costly failures occur without proper tank construction—above ground storage tanks built with advanced engineering provide durability, safety, and compliance.

Above ground storage tanks are constructed using high-grade steel or composite materials, reinforced foundations, corrosion protection layers, and precision welding, ensuring long-lasting strength, environmental compliance, and efficient storage performance.

Let’s explore the full construction process step by step.

Table of Contents

Foundation and Site Preparation

The construction of an above ground storage tank begins with a stable foundation. Engineers perform soil testing to evaluate bearing capacity and groundwater conditions. Concrete pads or ring foundations are typically laid to evenly distribute the tank’s load. Proper site grading ensures water drains away from the tank, reducing risks of corrosion at the base.

Material Selection

Most tanks are built from carbon steel, stainless steel, or composite materials. Carbon steel offers cost efficiency, stainless steel provides superior corrosion resistance, and composites are chosen for chemicals incompatible with metal. The choice of material depends on the stored product—crude oil, chemicals, or water—and compliance with API, ASTM, or ISO standards.

Plate Fabrication and Assembly

The tank shell is constructed from prefabricated steel plates. These are rolled, aligned, and welded together to form cylindrical walls. Welding is performed using certified procedures to ensure leak-proof joints. Automated welding machines and non-destructive testing (NDT) such as ultrasonic inspection verify integrity.

Bottom and Roof Installation

Tank bottoms are laid first, often in a lap-welded design for extra strength. Roofs vary:

Fixed cone roofs for standard liquids.
Floating roofs that rise and fall with liquid levels, minimizing vapor emissions.
Domed roofs for pressurized storage.

Corrosion Protection and Coating

A critical step in construction is corrosion protection. Tanks are coated with epoxy, polyurethane, or lined with specialized polymer sheets to resist chemical attack. Cathodic protection systems may also be installed to prevent rusting.

Safety Systems

Modern tanks include emergency vents, overflow protection, fire suppression nozzles, and real-time monitoring sensors. These features ensure operational safety and compliance with environmental regulations.

Final Inspection and Commissioning

Before a tank is put into service, hydrostatic testing and NDT methods confirm structural integrity. Once certified, the tank is connected to pipelines and monitoring systems for full integration into facility operations.

Above ground storage tanks, when constructed with precision and modern techniques, provide decades of safe and reliable service.