International Standards for LNG Cryogenic Tanks: ASME, GB/T, EN Explained
Why the Standard Matters More Than the Price
A buyer comparing quotes for a cryogenic storage tank from three manufacturers will find three different sets of specifications, three different standards referenced, and three different packages of documentation. The buyer who selects based purely on price — without understanding what the standard means and what documentation they will receive — may save money upfront but will pay for it later in customs delays, installation problems, regulatory rejection, or worse.
The standard under which a tank is built determines what materials can be used, how welds are inspected, what tests are performed, who signs off on the quality record, and what permissions are required to operate the tank in the destination country. It is the quality system surrounding the tank as much as the physical tank itself. Understanding the major standards — what they have in common, where they differ, and which one applies to your market — is essential knowledge for anyone buying or specifying a cryogenic storage tank.
The Four Major Standards: Overview
The American Society of Mechanical Engineers' Boiler and Pressure Vessel Code, Section VIII Division 1, is the most widely accepted pressure vessel standard in the world. It is used as the de facto international standard for cryogenic tanks in North America, Southeast Asia, the Middle East, Africa, South America, and most markets outside Europe and China. The "U-stamp" (or "UM-stamp" for smaller vessels) indicates the tank was built under ASME Section VIII inspection by an authorized ASME inspector. The standard is published and maintained by ASME in the US but is used internationally without requiring an ASME member to be present — an authorized inspector in the manufacturing country certifies compliance on behalf of ASME.
The mandatory national standard of the People's Republic of China for stationary cryogenic storage tanks. GB/T 18442 covers design, manufacture, inspection, and acceptance requirements for double-wall vacuum-insulated cryogenic pressure vessels. It is administered by the Special Equipment Safety Supervision and Administration of China (SAMR/TSG). Tanks operating within China must comply with GB/T 18442 and be registered with the local TSG (Technical Safety Supervision) authority. The standard is broadly equivalent in technical content to ASME Section VIII and EN 13458, though with some differences in format and specific rules.
The European Norm standard for cryogenic storage tanks sold in the European Union. EN 13458 is aligned with the Pressure Equipment Directive (PED 2014/68/EU), which sets the overall framework for pressure equipment safety in the EU. A cryogenic tank sold in the EU must carry the CE mark and be accompanied by a Declaration of Conformity. The Notified Body (NB) — an accredited third-party inspection agency — performs the conformity assessment and issues the CE marking authorization. Category I equipment may be self-certified by the manufacturer; Categories II–IV require direct NB involvement.
The International Organization for Standardization's series of standards for cryogenic vessels. ISO 21009-1 covers static vacuum-insulated cryogenic tanks; ISO 21009-2 covers tube trailers and demountable tanks. ISO standards are reference documents — they do not carry mandatory certification like ASME or EN standards. However, many national regulations reference ISO 21009 as the technical basis for cryogenic tank requirements, and some markets (particularly those without their own national standard) use ISO 21009 as the de facto specification.
Comparing Standards Side by Side
| Aspect | ASME Section VIII Div. 1 | GB/T 18442 | EN 13458 + PED |
|---|---|---|---|
| Jurisdiction | US / International | China | European Union |
| Certification mark | U-stamp / UM-stamp | TSG registration | CE mark |
| Third-party inspection | Authorized ASME Inspector (AI) | TSG-authorized inspector | Notified Body (NB) — mandatory for Cat II+ |
| Design temperature basis | Minimum design metal temperature (MDMT) | Design temperature per GB 150 | Minimum design temperature (MDT) |
| Material requirements | ASME II, SA materials; impact testing per UG-84 | GB/T specified materials; impact testing per standard | EN materials; impact testing per EN 13445 |
| Weld examination | RT, UT, MT, PT per ASME V | RT, UT, MT, PT per GB/T standard | RT, UT, MT, PT per EN 13445 |
| Pressure test | Hydrostatic at 1.43× MAWP or pneumatic at 1.15× MAWP | Hydrostatic at 1.25× design pressure | Hydrostatic at 1.43× MAWP or pneumatic at 1.15× MAWP |
| Acceptance by customs | Widely accepted globally | Required for China domestic use | Mandatory for EU import/use |
What Documentation Do You Actually Get?
The complete documentation package for an internationally certified cryogenic tank includes:
Which Standard Do You Need?
| Destination Market | Required Standard | Additional Requirements |
|---|---|---|
| China (domestic) | GB/T 18442 | TSG registration; operating permit from local SAMR bureau |
| United States | ASME Section VIII Div. 1 | U-stamp; state-level installation permit |
| European Union | EN 13458 + PED | CE marking; Declaration of Conformity; ATEX electrical certification if applicable |
| Southeast Asia (general) | ASME Section VIII Div. 1 | Check specific country import regulations; some require local registration |
| Middle East | ASME Section VIII Div. 1 | ADNOC, Saudi Aramco, or equivalent approval may be required for specific projects |
| Australia | ASME Section VIII or AS/NZS | Australian AS 1210 for pressure vessels; state-level approvals |
| Africa (general) | ASME Section VIII Div. 1 | Check specific country import regulations; most accept ASME |
XT Cryogenic Tank: Standards and Certifications
XT Cryogenic Tank manufactures cryogenic storage tanks under the following standards and certifications:
ASME Section VIII Division 1 — U-stamp certified; widely accepted for export to North America, Southeast Asia, the Middle East, Africa, South America, and most international markets
GB/T 18442 — Compliant for China domestic supply and export reference
EN 13458 — Design capability for European market; full PED conformity assessment available for export orders
ISO 21009 — Design reference standard
TSG 21 — Registered for China domestic Class II pressure vessel supply
Frequently Asked Questions
The four main standards are: ASME Section VIII Division 1 (most widely accepted internationally — US, Southeast Asia, Middle East, Africa, South America); GB/T 18442 (China domestic market); EN 13458 (European Union, aligned with PED 2014/68/EU); and ISO 21009 series (international reference standard). Each covers design, materials, fabrication, examination, testing, and marking requirements for cryogenic pressure vessels.
Under the EU Pressure Equipment Directive (PED), cryogenic tanks are classified into Categories I–IV based on hazard level (fluid group, pressure, volume). Category I and II tanks must be certified by a Notified Body and carry CE marking. Sound Engineering Practice (SEP) applies to lower-hazard equipment where mandatory third-party certification is not required. A small, low-pressure cryogenic tank might be SEP; a larger or higher-pressure tank might be Category II requiring full PED certification. The distinction is determined by the PED's category assignment tables.
United States and most international markets → ASME Section VIII Div. 1. European Union → EN 13458 plus PED Category II+ CE marking. China domestic → GB/T 18442. When in doubt, specify ASME Section VIII — it is the most internationally recognized standard and accepted in virtually every major market outside Europe. Always verify with your local regulatory authority or customer before ordering.
An ASME-certified tank ships with: Manufacturer's Data Report (MDR) / Form U-1 signed by the Authorized Inspector; design calculations; material test reports (MTRs) for all pressure-retaining materials; weld procedure specifications (WPS) and qualification records (PQR); welder qualification records; NDE examination reports (RT/UT/MT/PT); pressure test report; and the U-stamp marking. This package constitutes the complete quality record and is required for regulatory acceptance in most jurisdictions.
Yes. A tank can be designed and fabricated to meet ASME Section VIII, GB/T 18442, and EN 13458 simultaneously with minimal additional documentation — the underlying physics and engineering are the same across all three standards. This is common for manufacturers exporting to multiple markets. A well-documented ASME Section VIII tank can typically demonstrate compliance with EN 13458 or GB/T 18442 requirements with supplementary documentation addressing any minor differences in format, terminology, or specific rules.
