Machinery space ventilation

Machinery space ventilation
E.5.1 The ventilation systems for machinery spaces of category A shall be separated from the ventilation
systems serving other spaces and shall be in general of the supply type. Other modes of operation
may be applied upon special approval.
E.5.2 Machinery spaces of category A shall be adequately ventilated so as to ensure that when machinery
or boilers therein are operating at full power in all weather conditions including heavy weather, an
adequate supply of air is maintained to the spaces for the safety and comfort of personnel and the operation
of the machinery. Any other machinery space shall be adequately ventilated appropriate for the purpose
of that machinery space.
E.5.3 In general, ventilators necessary to continuously supply the machinery space shall have
coamings of sufficient height to comply with LLC 1966 as amended 1988, Regulation 19(3), without having
to fit weathertight closing appliances (see also D.3.2). However, where due to ship size and arrangement
this is not practicable, lesser heights for machinery space coamings, fitted with weathertight closing
appliances in accordance with LLC 1966 as amended 1988, Regulation 19(4), may be permitted by the
Administration in combination with other suitable arrangements to ensure an uninterrupted, adequate
supply of ventilation to these spaces. The machinery spaces are those defined in SOLAS Regulation II-
1/Reg. 3.16.

Paint stores and flammable liquid lockers

Paint stores and flammable liquid lockers
E.4.1 Paint stores and flammable liquid lockers are to be provided with ventilation arrangements
which are separate from other ventilation systems.
E.4.2 The ventilation system shall be capable of effecting at least 10 changes of air per hour. The
ducts are to be arranged such that both vapours lighter than air and vapours heavier than air can be removed.

E.4.3 Ventilation outlets or their duct openings shall lead to the open deck area.
E.4.4 The drives of mechanical ventilators shall be installed outside the rooms and air flow. Otherwise
certified safe type drive motors with an explosion protection of at least IIB T3 are to be used.
E.4.5 The ventilator design shall comply with regulation

Control stations

Control stations
E.3.1 Such measures as are practicable shall be taken in respect of control stations outside machinery
spaces in order to ensure that ventilation, visibility and freedom from smoke are maintained, so
that in the event of fire the machinery and equipment contained therein may be supervised and continue
to function effectively.
In case a control station is served by a common ventilation system, which serves also other spaces, effective
local closing arrangements shall be provided.
Effective local closing arrangements mean that the provided ventilation systems shall be fitted with fire
dampers or smoke dampers which could be closed easily within the control station in order to maintain
the absence of smoke in the event of fire.
E.3.2 Alternative and separate means of air supply shall be provided; air inlets of the two sources of
supply shall be so disposed that the risk of both inlets drawing in smoke simultaneously is minimized.
Such requirements need not be applied to control stations situated on, and opening on to, an open deck
and where local closing arrangements would be equally effective.
Alternative and separate means of air supply may be provided also by combination of a mechanical supply
duct and a natural exhaust duct or vice versa provided that the fan is reversible

Requirements for Particular Spaces

Requirements for Particular Spaces
E.1 Accommodation spaces
As far as applicable, national requirements should be observed concerning primary data of air condition
system and air change rates.
E.2 Galleys
E.2.1 Where they pass through accommodation spaces or spaces containing combustible materials,
the exhaust ducts from galley ranges shall be constructed of insulated "A" class divisions. Each exhaust
duct shall be fitted with:
 a grease trap readily removable for cleaning
 a fire damper located in the lower end of the duct and in addition, a fire damper in the upper end of
the duct
 arrangements, operable from within the galley near exit, for shutting off the exhaust fan
 fixed means for extinguishing a fire within the duct are to be provided on all cargo ships and passenger
vessels carrying not more than 36 passengers, where the ducts pass through accommodation
spaces or spaces containing combustible materials

Additional fire safety arrangements

Additional fire safety arrangements
D.7.1 Stopping devices of ventilation
Forced 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 spaces being
served. This position shall not be readily cut off in the event of a fire in the spaces served.
D.7.2 Means of control for machinery space ventilation arrangements
D.7.2.1 Means of control shall be provided for opening and closure of skylights, closure of openings in
funnels which normally allow for exhaust air ventilation and closure of ventilator dampers.
D.7.2.2 Means of control shall be provided for stopping fans. Controls provided for the power ventilation
serving machinery spaces shall be grouped so as to be operable from two positions, one of which
shall be outside such spaces. The means provided for stopping the power ventilation of the machinery
spaces shall be entirely separate from the means provided for stopping ventilation of other spaces.
D.7.2.3 Means of control shall be provided for stopping forced and induced draught boiler fans.

The controls required

D.7.2.4 The controls required in D.7.2.1 to D.7.2.3 shall be located outside the space concerned so
they will not be cut off in the event of fire in the space they serve.
D.7.2.5 Concerning control of smoke spread for machinery spaces, see D.7.3.3.
D.7.2.6 Automatic stopping of ventilation fans when releasing the CO2-System is not permitted. Separate
manual stopping of ventilation fans is to be carried out before releasing the CO2- System.
D.7.3 Control of smoke spread
D.7.3.1 Purpose
The purpose of this requirement is to control the spread of smoke in order to minimize the hazards from
smoke. For this purpose, means for controlling smoke in atriums, control stations, machinery spaces and
concealed spaces shall be provided.
D.7.3.2 Prevention of spread of smoke over several decks
Ventilation ducts serving more than one deck level shall be provided with readily accessible means of
closure at each deck level.
D.7.3.3 Release of smoke from machinery spaces
D.7.3.3.1 The provisions of D.7.3.3.2 to D.7.3.3.4 shall apply to machinery spaces of category A, and
where considered desirable to other machinery spaces.

Non-sparking fans

D.6 Non-sparking fans
D.6.1 Protection screens of not more than 13 mm square mesh are to be fitted in the inlet and outlet
ventilation openings on the open deck to prevent the entrance of objects into the fan housing.
D.6.2 Overheating of the mechanical components of fans and the creation of sparks is to be avoided
by appropriate design and by the choice of suitable materials. The safety clearance between the fan
housing and the impeller shall not be less than 1/10 of the inner impeller bearing diameter, limited to a
minimum of 2 mm and is to be such as to preclude any contact between the housing and the rotor. The
maximum clearance need not be more than 13 mm. The above requirement also applies to portable fans.
D.6.3 Following materials or combinations of materials for impeller/housing may be used:
 non-metallic materials (plastic material having sufficient electric conductivity) with each other or with
steel (incl. galvanized, stainless). The electrical resistance of non-metallic materials must not exceed
106 Ohm unless special measures are taken to prevent electrostatic charges at the surface of the
material.
 non-ferrous materials having good heat conductivity (bronze, brass, copper, not aluminium) with
each other or with steel (incl. galvanized, stainless)
 steel (incl. galvanized, stainless) with each other if a ring of adequate size made of above nonmetallic/non-ferrous
material is fitted in way of the impeller, or if a safety clearance of 13 mm is provided

 aluminium or magnesium alloys with each other or with steel (incl. galvanized, stainless) only, if a
non-ferrous ring having a good heat conductivity, i.e. copper, brass, of adequate size is fitted in way
of the impeller