Offshore Container Lifting Test: The First Line of Safety Assurance

In extreme offshore environments such as oil drilling platforms, offshore wind farms, FPSOs, and floating work zones, functional containers—such as accommodation modules, laboratories, control rooms, and equipment enclosures—serve not only as essential units for work and living but also as dual safeguards for equipment safety and personnel protection. In these scenarios, safely lifting containers onto decks or vessels is a critical and often underestimated process.

To ensure lifting operations are stable, secure, and controllable, offshore containers must undergo rigorous lifting tests and obtain third-party certification. This process is not only a regulatory requirement, but more importantly, a vital safeguard for life and property.

1. What is a Lifting Test?

A lifting test simulates the real-world lifting conditions of a container before it leaves the factory. It thoroughly examines the structural strength, weld integrity, and the robustness of lifting points (pad eyes). The test is carried out according to classification society or industry standards and serves two main purposes:

• To verify that the lifting structure can support the design load.
• To ensure that the structure does not undergo permanent deformation or failure under extreme conditions.

2. Why is Lifting Test Mandatory for Offshore Containers?

(1) Mandatory Compliance with Standards
Offshore containers are governed by stringent industry standards such as:

• DNV 2.7-1: Design, manufacture, and certification of offshore containers
• ISO 10855: Offshore containers used in the oil and gas industry
• EN 12079: European standard covering lifting equipment and structural requirements

All of these standards mandate that containers must undergo lifting tests and obtain valid certification before delivery.

(2) High-Risk Marine Environments Demand Zero Compromise
Lifting operations at sea are exposed to confined spaces, vessel motion, and unpredictable weather. Any failure in the lifting structure or pad eyes can result in equipment damage, loss of life, or catastrophic accidents. A lifting test ensures structural integrity and reliability under such conditions.

(3) Essential for Project Approval and Global Market Access
Oil & gas operators, EPC contractors, and classification societies routinely inspect lifting design and certified test results. Containers without certified lifting tests will be rejected from offshore sites.

3. How is a Lifting Test Performed?

TLS follows a standard process to ensure safe and certified lifting capability:
(1) Pad Eye Inspection & Structural Review

• Pad eyes are manufactured using high-strength steel.
• Welds are subjected to non-destructive testing (NDT) such as UT or MT.
• The integration of lifting points with the frame is examined for structural integrity.

(2) Static Load Test

• Load applied at 2 times the rated lifting capacity, as per DNV 2.7-1.
• Container is suspended for at least 5 minutes.
• Checked for any signs of deformation, cracks, or structural failures.

(3) Dynamic Load Test (if required)

• Simulates lifting operations with movement and sway.
• Monitors structural fatigue and elastic recovery under repeated loading.

(4) Final Certification
Upon successful testing, a certificate is issued by an accredited classification society (e.g., DNV, BV, LR, CCS).
This certificate accompanies the container upon delivery and is recognized by global offshore project stakeholders.

4. TLS Practice in Lifting Test Assurance

As a specialized manufacturer of offshore functional containers, TLS conducts lifting tests on every unit destined for marine environments. Our process includes:

• Full compliance with DNV 2.7-1 or custom project specifications
• On-site testing with professional lifting rigs and calibrated equipment
• Third-party witness testing and traceable documentation
• Issuance of globally recognized, valid lifting certificates

5. Conclusion: Safety Starts with Testing and Ends with Trust

Behind each seemingly simple lift lies a comprehensive evaluation of structural design, welding, material quality, and load handling capability. Only through a standardized and certified lifting test can every lifting operation be performed with confidence—establishing an unbreakable safety foundation for offshore operations.

TLS Offshore Containers / TLS Special Containers is a global supplier of standard and customised containerised solutions. 
Wherever you are in the world TLS can help you, please contact us.
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Written by Snowy

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