Summary

Beds describe sleeping provision. Offshore accommodation capacity depends on whether the complete installation can safely house and support the intended people. Check occupancy permissions, welfare services, utilities, escape and emergency arrangements together before adding accommodation modules or increasing personnel on board.


What actually determines offshore accommodation capacity?

An offshore accommodation module may physically contain the requested beds while the host facility lacks the water, sewage treatment, electrical capacity or emergency arrangements to support additional residents. The usable capacity is the occupancy justified for the complete installed arrangement and accepted through the applicable project process.


Separate three questions: how many sleeping places fit in the module, how many people the living facilities can support, and how many people the installation is permitted and prepared to accommodate. Those answers may differ.


For UK offshore installations, HSE Operations Notice 82 provides guidance on accommodation provision. Other locations, vessel types and projects can have different governing requirements. Establish the applicable basis before treating a module layout as an occupancy commitment.


Start with the people and their operating pattern

Define the maximum personnel on board (POB), the resident population and the expected overlap during crew changes or work campaigns. These are different planning inputs. A temporary increase can affect shared services even when some additional people do not require a bed.


Describe the shift pattern, occupancy duration and room allocation policy. Consider whether people sleeping during the day can rest while adjacent rooms, corridors and work areas remain active. The proposed allocation should also address privacy and the needs of the intended workforce under the applicable rules and operator policies.


Do not assume that sharing a bed between shifts is acceptable merely because it appears to reduce the required bed count. Any such arrangement needs review against the applicable accommodation requirements and the operator's arrangements for rest, hygiene and welfare.


Check the facilities that residents use every day

A sleeping cabin depends on services beyond its walls. Review toilets, showers, hot water, laundry, changing areas, meals, storage and recreation against the intended occupancy and usage pattern. Identify which facilities are inside the supplied modules and which are provided by the host.


For ships within its scope, the ILO Maritime Labour Convention accommodation provisions address matters including ventilation, sanitary facilities and the living environment. Applicability to a particular vessel and workforce must be established; these provisions should not be presented as a universal rule for every offshore installation.


As a procurement exercise, map the resident's daily activities to the available facilities. If the enquiry only specifies bunks and an external module size, the supplier cannot reliably assess the complete accommodation demand.


Verify host utilities at the proposed occupancy

Ask the host facility to confirm available electrical supply, potable water, hot water, drainage and sewage treatment capacity. Record connection points and the limits of each supply. A physical connection does not prove sufficient capacity.


HVAC design also needs the actual occupancy, climate and internal heat loads. A module arranged for fewer residents should not be treated as suitable for more occupants simply because another bunk can fit. Review ventilation, cooling, humidity control and acoustic conditions for the proposed use.


Specify who supplies interconnecting services and who verifies their performance after installation. This avoids a module supplier and host contractor each assuming that the other has included the same essential service.


Reassess escape and emergency arrangements

Additional residents change the population that must receive alarms, reach muster points and use the installation's emergency arrangements. Review the installed layout, escape routes, emergency lighting, alarm interfaces and access to evacuation systems.


HSE's PFEER guidance addresses protection and emergency response for relevant UK offshore installations. Its emergency response inspection guidance includes consideration of muster, temporary refuge and evacuation arrangements for personnel. These UK references illustrate why an increase in accommodation needs an installation-level review.


A sleeping module should not be assumed to function as a temporary refuge. That role requires a defined protection basis and supporting evidence. Likewise, spare beds do not establish spare evacuation capacity.


Review the module in its installed location

Before approving the layout, check deck support, imposed loads, securing, lifting access, service routing and maintenance access. Review door openings and corridor connections in the actual arrangement, including any interfaces between modules.


Specify the fire performance and certification required for the selected construction and installation. Check what each certificate covers. Evidence for lifting or structural manufacture alone does not establish the suitability of the complete accommodation arrangement for occupancy.


What should an accommodation enquiry include?

  • Installation type, location, applicable requirements and approval responsibilities.
  • Maximum POB, required sleeping places, shift pattern and occupancy duration.
  • Proposed module arrangement, access routes and host deck information.
  • Available utilities and the welfare facilities provided by the host.
  • Required fire performance, alarm interfaces and emergency arrangement constraints.
  • Inspection, testing and documentation expected before occupancy.


Frequently Asked Questions

Can more bunks increase an existing module's capacity?

Only if the revised arrangement is justified and accepted for the project. Space, ventilation, welfare services and emergency provisions all need review before occupancy increases.


Are temporary accommodation modules subject to fewer checks?

Temporary use does not remove the need to establish suitability. Campaign duration is an input to the assessment, rather than evidence that safety and welfare arrangements can be omitted.


Does the module supplier determine the permitted POB?

The supplier provides evidence for its defined scope. Permitted POB depends on the host installation and the applicable operator, authority and approval arrangements.


Plan the full accommodation requirement with TLS

Send TLS your required bed count together with maximum POB, shift pattern, host services and the proposed installation layout. Request a quotation that identifies the module scope, host responsibilities and documents needed for project review. Contact TLS.


Further Reading