E
SUB-COMMITTEE ON SHIP SYSTEMS AND
EQUIPMENT
3rd session
Agenda item 12
SSE 3/12/3
16 October 2015
Original: ENGLISH
UNIFIED INTERPRETATION OF PROVISIONS OF IMO SAFETY, SECURITY,
AND ENVIRONMENT-RELATED CONVENTIONS
IACS UI SC148 – Ventilation by fan coil units and internal circulation fans
Submitted by the International Association of Classification Societies (IACS)
SUMMARY
Executive summary:
This paper discusses IACS Unified Interpretation (UI) SC148 on
ventilation provided by fan coil units and internal circulation fans, in
the context of the application of SOLAS regulations II-2/5.2.1.2,
II-2/5.2.1.3 and II-2/7.9.3
Strategic direction:
1.1
High-level action:
1.1.2
Planned output:
1.1.2.3
Action to be taken:
Paragraph 10
Related documents:
None
Background
1
SOLAS regulation II-2/5.2.1.2 states:
"Power ventilation of accommodation spaces, service spaces, cargo spaces, control
stations and machinery spaces shall be capable of being stopped from an easily
accessible position outside the space being served. This position shall not be readily
cut off in the event of a fire in the spaces served."
2
SOLAS regulation II-2/5.2.1.3 states:
"In passenger ships carrying more than 36 passengers, power ventilation, except
machinery space and cargo space ventilation and any alternative system which may
be required under regulation 8.2, shall be fitted with controls so grouped that all fans
may be stopped from either of two separate positions which shall be situated as far
apart as practicable. Fans serving power ventilation systems to cargo spaces shall be
capable of being stopped from a safe position outside such spaces."
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3
SOLAS regulation II-2/7.9.3 reads:
"Passenger ships carrying more than 36 passengers shall have the fire detection
alarms for the systems required by paragraph 5.2 centralized in a continuously
manned central control station. In addition, controls for remote closing of the fire doors
and shutting down the ventilation fans shall be centralized in the same location.
The ventilation fans shall be capable of reactivation by the crew at the continuously
manned control station. The control panels in the central control station shall be
capable of indicating open or closed positions of fire doors and closed or off status of
the detectors, alarms and fans. The control panel shall be continuously powered and
shall have an automatic change-over to standby power supply in case of loss of normal
power supply. The control panel shall be powered from the main source of electrical
power and the emergency source of electrical power defined by regulation II-1/42
unless other arrangements are permitted by the regulations, as applicable."
Discussion
4
Initially, IACS developed UI SC148 to provide a unified interpretation of SOLAS
regulations II-2/5.2.1.3 and II-2/7.9.3 in relation to HVAC temperature control units in cabins
on passenger ships carrying more than 36 passengers (usually small units intended for
recirculation of air within a cabin), which are not capable of supplying outside air to the cabin.
5
In this context, the following functional requirement in SOLAS regulation II-2/5.1.1 is
considered relevant, especially the term "… to the space …":
"means of control for the air supply to the space shall be provided;"
6
Consequently, UI SC148 stated that the fan in a cabin HVAC temperature control unit
is not considered to be a ventilation fan as addressed in SOLAS regulations II-2/5.2.1.3
and II-2/7.9.3 if it is not capable of supplying outside air to the cabin when the power ventilation
is shut down.
7
Consequently, for passenger ships carrying more than 36 passengers, IACS
UI SC148 stated that fans "not capable of supplying outside air to a cabin" do not need to be
controlled from a centralized position. However, initially, for such fans "not capable of supplying
outside air to a cabin", IACS UI SC148 did not address the application of the provisions
of SOLAS regulation II-2/5.2.1.2, which is applicable to all vessel types - i.e. to "be capable of
being stopped from an easily accessible position outside the space being served".
8
Again, taking into account the functional requirement referred to in paragraph 5
above, IACS has recently reviewed UI SC148 in the context of the application of SOLAS
regulation II-2/5.2.1.2. Consistent with the rationale applied in the earlier development
of UI SC148, IACS has concluded that fans that do not supply outside air to spaces such as
cabins, cabinets, switchboards, etc. need not be capable of being stopped from outside
the space being served, for all ship types. Consequently, IACS has revised UI SC148
accordingly, a copy of which is provided in the annex.
9
The Sub-Committee is invited to note that IACS Members will uniformly implement
the latest version of IACS UI SC148 from 1 July 2016, unless they are provided with written
instructions to apply a different interpretation by the Administration on whose behalf they are
authorized to act as a recognized organization.
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Action requested of the Sub-Committee
10
The Sub-Committee is invited to consider the foregoing and the latest version of
IACS UI SC148, as set out in the annex, and decide as appropriate.
***
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Annex, page 1
ANNEX
REVISED IACS UNIFIED INTERPRETATION (UI) SC148 ON VENTILATION
PROVIDED BY FAN COIL UNITS AND INTERNAL CIRCULATION FANS
SC148 Ventilation by fan coil units and internal circulation fans
(May
(Reg.II-2/5.2.1.2, II-2/5.2.1.3 and reg.II-2/7.9.3)
1999)
(Rev.1 SOLAS regulations chapter II-2/5.2.1.2 reads:
Nov
Power ventilation of accommodation spaces, service spaces, cargo spaces, control stations
2005) and machinery spaces shall be capable of being stopped from an easily accessible position
outside the space being served. This position shall not be readily cut off in the event of a fire
(Rev.2 in the spaces served.
Sept
SOLAS regulations chapter II-2/5.2.1.3 reads:
2015)
In passenger ships carrying more than 36 passengers, power ventilation, except machinery
space and cargo space ventilation and any alternative system which may be required under
regulation 8.2, shall be fitted with controls so grouped that all fans may be stopped from either
of two separate positions which shall be situated as far apart as practicable. Fans serving
power ventilation systems to cargo spaces shall be capable of being stopped from a safe
position outside such spaces.
SOLAS regulations chapter II-2/7.9.3 reads:
Passenger ships carrying more than 36 passengers shall have the fire detection alarms for the
systems required by paragraph 5.2 centralized in a continuously manned central control
station. In addition, controls for remote closing of the fire doors and shutting down the
ventilation fans shall be centralized in the same location. The ventilation fans shall be capable
of reactivation by the crew at the continuously manned control station. The control panels in
the central control station shall be capable of indicating open or closed positions of fire doors
and closed or off status of the detectors, alarms and fans. The control panel shall be
continuously powered and shall have an automatic change-over to standby power supply in
case of loss of normal power supply. The control panel shall be powered from the main source
of electrical power and the emergency source of electrical power defined by regulation II-1/42
unless other arrangements are permitted by the regulations, as applicable.
_______________________
Note:
1.
This UI SC 148 is to be uniformly implemented by IACS Members and Associates
from 1 January 2000.
2.
Revision 2 of UI SC148 is to be uniformly implemented by IACS Societies
from 1 July 2016.
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Annex, page 2
Interpretations
The fan in a HVAC temperature control unit, or a circulation fan inside a cabinet/switchboard,
is not considered to be a ventilation fan as addressed in reg.II-2/5.2.1.2, reg.II-2/5.2.1.3 and
reg.II-2/7.9.3, if it is not capable of supplying outside air to the space when the power ventilation
is shut down (e.g., small units intended for recirculation of air within a cabin).
Therefore, such fans need not be capable of being stopped from an easily accessible position
(or a safe position) outside the space being served when applying SOLAS reg.II-2/5.2.1.2 or
reg.II-2/5.2.1.3, and need not be capable of being controlled from a continuously manned
central control station for passenger ships carrying more than 36 passengers when applying
SOLAS reg.II-2/7.9.3.
End of
Document
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