When a standard ISO container cannot meet your operational requirements — because of hazardous area classification, offshore crane operations, specialist internal fit-out or unique structural demands — you need a special purpose container. But specifying one correctly is more complex than ordering a standard unit. This guide walks procurement teams and project engineers through the key decisions that determine whether a special purpose container meets its operational requirements from day one.
Step 1: Define the Primary Function
The starting point for any special purpose container specification is a precise definition of what the unit must do. Vague requirements produce containers that don’t perform as expected. The primary function determines the structural configuration, internal fit-out, certification requirements and environmental specifications.
Common Special Purpose Container Functions
Control Room and Command Centre Containers
- Houses SCADA, DCS or military command systems
- Requires: UPS power, precision HVAC, EMI shielding, cable management
- May require: EMP hardening for military applications, blast resistance for process plant installations
- Key certification: ATEX if installed in hazardous area, DNV 2.7-1 if offshore
Laboratory and Testing Containers
- Mobile analytical laboratories for oil and gas, environmental and pharmaceutical applications
- Requires: fume extraction, chemical-resistant worktops, specialist gas supply, precision temperature control
- May require: ISO 17025 laboratory accreditation compliance
- Key certification: ATEX for volatile chemical handling, medical standards for pharmaceutical labs
HAZMAT Storage Containers
- Storage of flammable liquids, chemicals or radioactive materials
- Requires: spill containment bund, flame arrestors, ventilation, static grounding
- Key certification: ATEX Zone 1 or Zone 2, ADR/IMDG for transport, COSHH compliance
Secure Storage and Armory Containers
- Military ammunition, weapons and sensitive equipment storage
- Requires: ballistic-resistant panels, reinforced locking systems, tamper detection
- May require: EMP shielding for electronic equipment, climate control for ammunition stability
- Key certification: MIL-SPEC, NATO STANAG standards
Mobile Data Centre Containers
- Server room and data processing in remote or temporary locations
- Requires: precision cooling, redundant power, fire suppression, physical security
- Key certification: Uptime Institute Tier standards, EN 50600 data centre standards
Step 2: Establish the Certification Requirements
Certification requirements are determined by where the container will be installed and operated — not by what is inside it. Get this wrong and the container will be refused on site.
Certification Checklist
- Offshore crane operations → DNV 2.7-1 mandatory
- Zone 1 or Zone 2 hazardous area → ATEX/IECEx mandatory for all electrical equipment
- Marine installation on vessel → Lloyd’s Register, ABS or DNV class notation may be required
- Military application → MIL-SPEC, STANAG or NATO standards as specified by the authority
- Medical application → ISO 13485, WHO or national health authority standards
- Road transport in EU → ADR for dangerous goods, abnormal load permit for oversized units
Step 3: Define Environmental Conditions
Special purpose containers are often deployed in environments that standard containers are not designed for. Define the full range of conditions the unit must operate in:
- Ambient temperature range — minimum and maximum, including solar radiation effects
- Humidity range — critical for electronics, pharmaceuticals and precision instruments
- Corrosion exposure — C3 inland, C4 coastal, C5-M offshore marine
- Wind and snow loads — for permanent or semi-permanent installations
- Seismic requirements — for installations in earthquake-prone regions
Step 4: Specify the Structural Configuration
Standard ISO container structures are designed for corner-loaded stacking and intermodal transport. Special purpose containers often require structural modifications that must be engineered and certified:
- Additional lifting points — for non-corner lift configurations or offshore crane operations
- Structural openings — for doors, windows, cable entries and ventilation penetrations
- Floor reinforcement — for heavy equipment loads or forklift access
- Blast resistance — for process plant or military installations within blast zones
Any structural modification invalidates the original ISO certification. All modified containers must be recertified by a competent authority before use.
Tamga Modules Special Purpose Container Solutions
Tamga Modules engineers and manufactures special purpose containers for complex operational requirements across defence, energy, offshore and industrial sectors. We manage the full specification, engineering, certification and delivery process — from initial requirement definition to certified unit on site.
Our special purpose container capabilities include ATEX explosion proof containers, E-House and control room containers and DNV certified offshore units.