Classification Alert: Consideration for funnels in the Equipment Number (IACS UR A1)
4 November 2021
Applicability: shipowners, technical managers, operators, designers and shipbuilders.
The International Association of Classification Societies (IACS) Unified Requirement on Anchoring Equipment (UR A1) has been revised recently. These revised requirements in UR A1, Rev 7, September 2020 (and the corrigendum published in September 2021) will apply to ships contracted for construction from 1 January 2022.
Accordingly, the following Lloyd’s Register (LR) Rule set will be updated and come into effect on 1 January 2022:
- Rules and Regulations for the Classification of Ships
Funnel size and Equipment Number
The updates include consideration for the front projected area and side projected area of large funnels in the equipment number calculations, so accounting for their contribution in anchoring loads. Funnels of breadth less than or equal to B/4 at all elevations along the funnel height, where ‘B’ is the moulded breadth, do not need to be taken into account.
Impact on ship design
For ships contracted for construction from 1 January 2022, increased anchoring equipment may be required if funnels have a width greater than B/4.
What to do now
It is proposed that the Rule amendment notices for LR Ship Rules will be issued in the month of November 2021 with effect from 1 January 2022. The amendment notices, when published, can be referred to for further details on the LR website.
The revised IACS UR A1 and its technical background is publicly available for reference on the IACS website.
For further information, please get in touch with UKITSO-Ship Structures SST@lr.org