IACS History File + TB, Part A UI SC35 Fixed fire detection and fire alarm system Part A. Revision History Version no. Approval date Implementation date when applicable Rev.3 (July 2013) 22 July 2013 1 January 2014 Rev.2 (Sept 2009) 24 September 2009 1 July 2010 Rev.1 (Nov 2005) 17 November 2005 - NEW (1985) No record - Rev.3 (July 2013).1 Origin for Change: Suggestion by IACS member.2 Main Reason for Change: Complaints were received from shipyards that the revision 2 of the UI was interpreted differently. The difference concerns interpretation of the expression Fixed Fire Detection and Fire Alarm System. Some societies interpret the expression to include the alarm sounder system, whereas other societies keep this part out of the definition..3 List of non-iacs Member Classification Societies contributing through the TC Forum and/or participating in IACS Working Group: None..4 History of Decisions Made: It was agreed to set separate requirements to the power supply to the alarm sounder system in addition to review the existing interpretations, i.e. what is meant by continuity of power supply and requirement to a battery when this is used as the power supply, with the revised FSS Code. The FSS Code Chapter 9 has been revised (MSC 91/3 Annex 2) and it was during the panels work decided to align the interpretation with the revised Code..5 Other Resolutions Changes None.6 Dates: Original Proposal: April 2011 Panel Approval: 21 June 2013 (By Machinery Panel) GPG Approval: 22 July 2013 (11088_IGh) Page 1 of 3
Rev.2 (Sept 2009).1 Origin for Change: Suggestion by IACS member.2 Main Reason for Change: It was felt that the UI in its present form was not exhaustive in respect to various designs that may be applied to meet para 2.2., Chapter 9, of the FSS Code. Therefore it was agreed to revise this document..3 History of Decisions Made: Statutory Panel members after discussion within their Panel requested the Machinery Panel to consider deleting/revising the UI SC35 for the reasons given in.2 above. The Machinery Panel decided to revise the UI than to delete it..4 Other Resolutions Changes N/A.5 Any dissenting views N/A.6 Dates: Original Proposal: July 2006, made by Statutory Panel Machinery Panel Approval: June 2009 GPG Approval: 24 September 2009 (ref. 6174_IGf) Rev.1 (Nov 2005) No TB document available. NEW (1985) No TB document available. Page 2 of 3
Part B Part B. Technical Background List of Technical Background (TB) documents for UI SC35: Annex 1. TB for Rev.2 (Sept 2009) See separate TB document in Annex 1. Annex 2. TB for Rev.3 (July 2013) See separate TB document in Annex 2. Note: There are no separate Technical Background (TB) documents for the original resolution (1985) and Rev.1 (Nov 2005). Page 3 of 3
Part B, Annex 1 Technical Background (TB) document UI SC35, Rev.2 (Sept 2009) FSS Code, Ch.9 2.2 Sources of power supply There shall be not less than two sources of power supply for the electrical equipment used in operation of the fixed fire detection and fire alarm system, one of which shall be an emergency source. The supply should be provided by separate feeders reserved solely for that purpose. Such feeders shall run to an automatic change-over switch situated in or adjacent to the control panel of the fire detection system. There is a majority view of the Statutory Panel that SC35 should not remain in its present form as it precludes designs that correctly reflect the intent of the FSS Code, Chapter 9 para 2.2, namely the use of batteries as one of the sources of power. The power supplies for the fixed fire detection equipment shall be arranged such that a failure will not result in loss or degradation of the fixed fire detection and fire alarm system performance. Where necessary, a source of stored energy is to be provided to ensure continuity of fire detection and alarm system when the automatic power supply changeover switch changes supply. A battery may be used as one of the two sources of power and can be self-contained within the fire detection and alarm panel or situated in another location suitable to provide a supply in the event of an emergency. The capacity of the battery must be able to power the fire detection and alarm system for a period of 18 hours for cargo ships and 36 hours for passenger ships. Submitted by Machinery Panel Chairman 12 September 2009 (Ref. Task PM6908) Page 1 of 1
Part B, Annex 2 Technical Background document for UI SC35 (Rev.3, July 2013) 1. Scope and objectives The interpretation has as its objective to clarify what is required to obtain continuity of power supply to the fire alarm and detection system, battery requirements when a battery is arranged as the emergency supply and requirements to supply power to the alarm sounder system when it is external to the fire alarm and detection system. 2. Engineering background for technical basis and rationale FSS code 2.5.1.1 The activation of any detector or manually operated call point shall initiate a visual and audible fire signal at the control panel and indicating units. If the signals have not received attention within 2 min an audible alarm shall be automatically sounded throughout the crew accommodation and service spaces, control stations and machinery spaces of category A. This alarm sounder system need not be an integral part of the detection system. In fact in many cases the general emergency alarm system is used as the alarm sounder system. The general emergency alarm system power supply requirements are found in LSA Code 7.2.1.1 The general emergency alarm system shall be powered from the ship' s main supply and the emergency source of electrical power required by regulation II-1/42 or II-1/43, as appropriate. It is reasonable to apply the same requirement to an external alarm sounder system to alert a fire. 3. Source/derivation of the proposed IACS Resolution FSS Code LSA Code 4. Summary of Changes intended for the revised Resolution: The main changes are to apply the revised FSS Code, to amend the text regard battery supply to the revised FSS Code and to include the power supply requirements to an external alarm sounder system. 5. Points of discussions or possible discussions One member commented that a flag state recently did not accept the power supply arrangement to the audible alarm sounder which was arranged in line with revision 3 of UI SC35 as the audible alarm stopped temporarily during blackout, in spite of being acceptable for the GA according to the LSA code. On vessels where the emergency source of power is a battery, SOLAS requires a capacity of 18 hours operation of the fire detection and fire alarm system on cargo vessels and 36 hours for passenger vessels (SOLAS Ch. II-1 Reg. 42 and 43). The panel consider that 30 minutes operation as required in FSS 9.2.2.3 shall be within this period (18 or 36 hours as applicable). 6. Attachments if any None