JIP35 – Standardisation of Offshore Structures Specifications

Like JIP33, JIP35 aims to achieve industry-level standardisation. Its focus is on offshore structures specifications, driving reductions in upstream project costs through a decrease in variation in requirements between operating companies.

About JIP35

Recent trends in oil and gas projects have demonstrated substantial budget and schedule overruns. The Oil & Gas Community within the World Economic Forum (WEF) have implemented a Capital Project Complexity (CPC) initiative which seeks to drive a reduction in upstream project costs with a focus on industry-wide, non-competitive collaboration and standardisation.

In 2017, following the publication of the IOGP Operators’ Position and Key Messages on Standards (April 2017) and a successful pilot study for IOGP JIP 33 Standardisation of Equipment Specifications for Procurement, the IOGP Offshore Structures Subcommittee discussed improving efficiency in this discipline by reducing or eliminating variation in requirements between operating companies and developing common operator requirements for offshore structures.

It established a Task Force (with administrative support funded by JIP35) to agree on the industry and/or international standards for each discipline and then develop minimum common requirements to improve efficiency and quality while reducing variation and cost.

Ten IOGP Member companies participated in developing these specifications, with the objective to leverage and improve industry level standardisation for projects globally in the oil and gas sector.

The work has developed a minimised set of supplementary requirements for the design and operation of offshore structures based on a critical review of the ten participating members’ company specifications, building on recognised industry and/or international standards.

The task covers 11 subdisciplines, each associated with one industry and/or international standard, for application in the Petroleum and Natural Gas Industries:

  1. S-631-01 General requirements for offshore structures
  2. S-631-02 Arctic offshore structures
  3. S-631-03 Concrete offshore structures
  4. S-631-04 Topsides structures
  5. S-631-05 Foundations
  6. S-631-06 Weight management
  7. S-631-07 Station keeping
  8. S-631-08 Seismic
  9. S-631-09 Metocean
  10. S-631-10 Marine soil investigations
  11. S-631-11 Fixed steel offshore structures

A twelfth subdiscipline, floating offshore structures, was specified as part of the task but has been deferred due to the complexity of having a range of classification society rules and the volume of additional company requirements for this subdiscipline.

The expectation is that the participating and other operating and engineering companies will adopt and reference all parts of the specification series IOGP S-631 for offshore structures, with the participating companies eliminating the supplemental requirements from their in-house specifications. The IOGP Offshore Structures Subcommittee  will track the adoption of the parts of this specification and the reduction in company requirements.

This series of specifications has been developed to promote the opportunity to realise benefits from standardisation and achieve significant cost reductions for upstream project costs.

It aims to significantly reduce waste, decrease project costs and improve schedule through precompetitive collaboration on standardisation. These specifications define the supplementary requirements to recognised industry and/or international standards which are indispensable for the application of this specification.

The Offshore Structures Specification Task Force performed their activities in accordance with IOGP’s Competition Law Guidelines. Terminology used within these Specifications is in accordance with ISO/IEC Directives, Part 2 and as defined in the parent standard.


The objective of this initiative is to provide “minimum specifications” which may be used by any operator to replace or supplement their own specifications. These “minimum specifications” were developed according to the following rules:

  • Based on international or industry standards with (minimum) additional requirements
  • Any additional requirement must be assessed and the value justified
  • Less focus on ‘technical excellence’ and more focus on risk mitigation
  • Safety cannot be compromised

Whilst this task aims to harmonise some internal company specifications and deliver joint specifications providing design efficiencies, which in turn achieve cost savings, the ultimate goal is to facilitate the development of a catalogue of international, globally-relevant standards that can be used locally, worldwide.

The scope comprised standards and specifications for the design of permanent fixed and floating structures, including foundations. For floating structures stability, marine systems and mooring were included. Risers, offloading hoses and mobile units (e.g. jack-ups and drilling semisubmersibles) were excluded.

Contact us

Please contact us via email at jip35@iogp.org

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