The design of offshore cranes differs fundamentally from that of land‑based cranes – factors such as wind, waves, salt spray, and vessel motions demand specialised technical standards. API Spec 2C is among the most important of these. This article provides clear, practical answers to two key questions: “when is API 2C required?” and “can classification societies certify against it?”
I. What Is API 2C, and What Equipment Does It Cover?
API Spec 2C, full title Specification for Offshore Pedestal‑Mounted Cranes, is published by the American Petroleum Institute (API). It sets forth technical requirements specifically for the design, construction, and testing of offshore pedestal‑mounted cranes.
It applies to:
Cranes installed on fixed or floating platforms
Deck cranes installed on vessels (for cargo handling within port areas or sheltered waters)
Heavy‑lift equipment installed on barges, jack‑up vessels, or other craft
Crane vessel cranes used for offshore wind installation, pipelaying, subsea operations, and similar tasks
It does NOT apply to:
Davits and/or emergency escape devices
Subsea lifting and lowering operations
Constant tension systems
II. When Must a Offshore Crane Be Designed to API 2C?
The following six scenarios typically require a crane to be designed in accordance with API Spec 2C:
1. Offshore Oil and Gas Platforms
This is the core application. U.S. federal regulations explicitly require that all cranes manufactured after March 17, 2003, and installed on fixed platforms must meet API Spec 2C.
Whether on fixed or floating platforms, cranes used for oil and gas exploration and production generally fall within the scope of API 2C.
Cranes on conventional surface vessels for handling cargo, containers, and other materials. The Eighth Edition of API Spec 2C has expanded its scope to cover a wider range of shipboard applications.
3. Heavy‑Lift Operations
Cranes installed on barges, jack‑up vessels, or other craft for construction and salvage work within port areas or sheltered waters.
4. Crane Vessel Operations
Cranes on ship‑shaped vessels, submersibles, barges, or self‑elevating offshore units, used for heavy or special‑load lifting in pipelaying, offshore wind, subsea operations, etc.
5. Offshore Wind Installation and Maintenance
With the growth of offshore wind, cranes on turbine installation vessels and service operation vessels are increasingly required to comply with API 2C. The IOGP S‑618 procurement specification, developed by the International Association of Oil & Gas Producers, is based on API Spec 2C, Eighth Edition, as an industry‑wide requirement.
6. International Oil Company Procurement Requirements
Major international oil companies (e.g., Shell, BP, Total) typically specify that offshore crane suppliers must follow API Spec 2C.
In a Nutshell:
If a crane is installed on an offshore platform, vessel, or barge and is used for oil & gas, wind, or marine engineering operations, it is very likely that API 2C design and manufacturing are required.
III. Can Classification Societies Certify Cranes Against API 2C?
Yes. And this is standard industry practice.
1. Classification Societies Are Recognised Certifying Bodies
The U.S. Coast Guard (USCG) explicitly recognises major classification societies (such as ABS, BV, CCS, DNV, LR, NK, etc.) as authorised certifying authorities for cranes. This means they are permitted to conduct design reviews and issue product certifications based on API 2C.
2. The Typical Process
| Phase | Description |
|---|---|
| Design & Calculation | Manufacturer performs structural strength, fatigue life, dynamic load, and corrosion protection calculations per API 2C |
| Drawing Review | Drawings submitted to the classification society, which reviews them against API 2C |
| Materials & Manufacturing | Society surveyors witness material traceability, welding procedures, NDT, and other critical steps |
| Load Testing | Witness 125% dynamic load test and 150% static load test to verify actual lifting capacity |
| Certificate Issuance | Upon successful completion of all inspections, the society issues a product certificate |
3. Classification Society Certification vs. API Certification
They are complementary, not mutually exclusive:
| Certification Type | Focus | Issuing Body |
|---|---|---|
| Classification Society Certification | Safety and regulatory compliance as ship/platform equipment | ABS, BV, CCS, DNV, LR, NK, etc. |
| API 2C Compliance Statement | Technical compliance as specialised petroleum industry equipment | Manufacturer’s self‑declaration or third‑party verification |
| API Monogram | API 2C compliance + API quality management system (optional) | API |
4. Industry Practice Examples
- South China Marine Machinery designed and manufactured its heavy offshore crane to API 2C and obtained certification from Lloyd's Register (LR) .
- BOMCO's 40‑ton offshore platform crane complies with API 2C and meets all control requirements of China Classification Society (CCS) .
- MAXTECH's 3‑ton/39‑metre offshore crane has obtained an API 2C Compliance Statement and BV product certification.
- All Seatrax offshore cranes carry the API 2C monogram nameplate.
IV. Frequently Asked Questions
Q1: If a crane is designed to API 2C, will the classification society definitely issue a certificate?
Not “definitely,” but “in most cases, yes.” Provided that design, manufacturing, and testing all meet API 2C requirements and the classification society's surveys are passed, the society will issue a product certificate based on API 2C.
Q2: Can classification society certification replace an API 2C Compliance Statement?
No, it cannot fully replace it. The API 2C Compliance Statement is a formal declaration by the manufacturer that the product meets API 2C technical requirements, and it is often a prerequisite for classification society certification. They are sequential, not alternatives.
Q3: Is it over‑specification if a client requires both “API 2C” and “classification society certification”?
No. This is the standard configuration for international oil companies and offshore engineering projects. API 2C addresses technical standards, while classification society certification addresses regulatory compliance – together they form the complete compliance chain for offshore cranes.
For offshore cranes, “API 2C design + classification society certification” has become an industry‑standard approach. This combination ensures that equipment simultaneously meets both the petroleum industry's technical standards and the regulatory requirements for ships/platforms, providing customers with dual assurance – covering both safety and reliability, as well as global compliance.
Post time: Sep-02-2026
