EN 14620 Standard: General Provisions and Specification Structure
The European standard EN 14620 is a fundamental technical regulation for the design and construction of vertical cylindrical flat-bottom tanks intended for the storage of liquefied gases under isothermal conditions (temperature range from 0°C to -165°C). Specialists at EV Group China emphasize that these requirements ensure the necessary level of safety and operational reliability when handling cryogenic media under low excess pressure (up to 500 mbar).
EN 14620-1: General Provisions
The first part of the standard defines the scope and basic design concepts. The regulation covers onshore steel tanks, including hybrid structures with concrete elements. It is important to note that the standard does not apply to auxiliary equipment (pumps, shut-off valves) unless their integration affects the structural capacity and integrity of the main shell. The designer bears full responsibility for adapting technical solutions in cases where the vessel configuration goes beyond the typical solutions described in the document.
EN 14620-2: Metal Structure Requirements
The second section is dedicated to metal-intensive components of tank farms. EV Group China supplies high-quality rolled metal products that meet the strict criteria of EN 14620-2 regarding toughness, ductility, and corrosion resistance at extremely low temperatures. The document contains comprehensive requirements for the selection of steel grades, welding methods, and quality control of metal structures.
EN 14620-3: Concrete Components
The third part establishes technical parameters for concrete structures, which are often used as external protective shells (secondary containers) in double-walled tanks. Special attention is paid to preventing cracking and ensuring the structural integrity of the concrete when in contact with cryogenic temperatures.
EN 14620-4: Insulation Systems
Insulation in isothermal tanks is a critical unit that ensures the containment of product boil-off and protects the foundation from frost heave. The EN 14620-4 standard regulates the selection of materials and installation technologies for the thermal insulation layer, preventing condensation and icing on the outer surface.
EN 14620-5: Testing and Commissioning
The final part of the standard describes protocols for hydraulic and pneumatic testing, drying processes, nitrogen purging, and controlled cooling (first filling). Adherence to these procedures is a mandatory prerequisite for ensuring the durability and safety of LNG facilities and other liquefied gas sites.