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Question

Which types of equipment can be certified under the item UK/3.12: Devices to prevent the passage of flame into the cargo tanks in tankers?

Recommendation

The IMO MSC Circ. 677 (Amended by MSC/Circ. 1009, 1324 and 1325) gives the following definitions:

• 1.3.1 鈥淔lame Arrester鈥� is a device to prevent the passage of flame in acc. with a specified performance standard.
• 1.3.2 鈥淔lame Screen鈥� is a device utilising wire mesh to prevent the passage of unconfined flames in acc. with a specified performance standard.
• 1.3.5 鈥淗igh Velocity Vent鈥� is a device to prevent the passage of flame鈥�
• 1.3.6 鈥淧ressure/Vacuum valve鈥� is a device designed to maintain pressure and vacuum in a closed container within present limits.

The standard EN ISO 16852 (the standard is applicable in the version as set out in the valid Implementing Regulation) applies to all 鈥渇lame arresters which prevent the transmission of a flame鈥� in the presence of flammable gas/air or vapour/air mixtures.

The standard ISO 15364 (the standard is applicable in the version as set out in the valid Implementing Regulation) applies to pressure-vacuum relief valves protecting marine vessel systems, including cargo tanks, which subject to das/vapour pressure beyond the design parameters of the system/tank.

Considering the above, it is recommended to certify the following types of equipment under item UK/3.12: * High velocity valve * Vacuum valve (end of line) to be combined with high velocity valve or low velocity pressure relief valve with flame screen * Flame arrester * Flame screen * Detonation flame arrester * Low velocity pressure relief valve with flame screen

References

• MSC Circ. 677
• MSN 1874 as amended
• The Merchant Shipping (Marine Equipment) Regulations 2016 as amended

Items affected

• UK/3.12, Devices to prevent the passage of flame into the cargo tanks in tankers

More information

Telephone: +44 (0) 203 817 2000

Email: MEQA@mcga.gov.uk

Website: www.gov.uk/mca