VENTILATION OF ACCOMMODA
TION SPACES
Accommodation spaces need to be ventilated to introduce
fresh air into the spaces. V
entilation method; e.g. windo
ws,
hatches, doors
, and blo
wers; used to accomplish this ma
y ,
under certain conditions
, bring hazardous le
vels of CO into
the accommodation spaces. Care should be tak
en to be
aw
are of all prevailing conditions when using these v
enti-
lating methods.
PORT
ABLE GENERATOR SETS
Gasoline pow
ered portab
le generators are a
vailab
le in the
marine mar
ket place and are not an option a
vailab
le
through Larson. Por
table gener
ators will produce CO.
These sets discharge their exhaust products in locations
which can lead to an increase in the accumulation of car-
bon monoxide in the accommodation space
. This
equipment is not recommended for use on Larson boats
.
MAINTENANCE - ENGINE PERFORMANCE
Efficient engine perfor
mance is vital to minimizing CO pro-
duction. The follo
wing items are those considered to have
the greatest eff
ect on increased CO production:
1.
Fuel systems - fuel that is contaminated, stale or incor-
rect octane number
.
2.
Carburetors/Injectors
•
Dirty or clogged flame arrester
.
•
Malfunctioning automatic choke plate or f
aulty
adjustment of manual chok
e plate.
•
Wor
n float needle valv
e and seat.
•
High float level.
•
Incorrect idle mixture adjustment.
•
Dirty or w
orn injectors
.
3.
Ignition System
•
Fouled or w
orn spar
k plugs.
•
Wor
n points or incorrect gap on points.
•
Shorted or opened circuit high tension spar
k plug
cables
.
•
Incorrect ignition timing.
4.
General
•
Wor
n piston rings and v
alves
.
•
Engine temperature - cold r
unning engines
increase CO production. Engine cooling water sys-
tem design and selection of thermostat(s) are
primar
y considerations aff
ecting engine operating
temperature
. Generally
, an engine produces less
CO if it operates at a relativ
ely high temperature
within manuf
acturer’s specifications
.
•
Exhaust Back-Pressure - cer
tain alterations to the
exhaust system ma
y increase engine exhaust bac
k
pressure andCO
production.
•
Restricted engine room or compar
tment ventilation.
CO Detectors
Even with the best boat design and constr
uction, together
with the utmost care in inspection, operation and mainte-
nance, hazardous le
vels of CO ma
y still be present in
accommodation spaces under certain conditions
.
Continuing obser
vation of passengers f
or symptoms of CO
intoxication can be supplemented b
y a marine g
rade alar
m
type CO detector installed in the accommodation space.
1.14
FIGURE 1.9 THE EFFECT OF CANVAS
CONFIGURATIONS
VENTILATION OF ACCOMMODATION SPACES
Accommodation spaces need to be ventilated to introduce
fresh air into the spaces. Ventilation method; e.g. windows,
hatches, doors, and blowers; used to accomplish this may,
under certain conditions, bring hazardous levels of CO into
the accommodation spaces. Care should be taken to be
aware of all prevailing conditions when using these venti-
lating methods.
PORTABLE GENERATOR SETS
Gasoline powered portable generators are available in the
marine market place and are not an option available
through Larson. Portable generators will produce CO.
These sets discharge their exhaust products in locations
which can lead to an increase in the accumulation of car-
bon monoxide in the accommodation space. This
equipment is not recommended for use on Larson boats.
MAINTENANCE - ENGINE PERFORMANCE
Efficient engine performance is vital to minimizing CO pro-
duction. The following items are those considered to have
the greatest effect on increased CO production:
1. Fuel systems - fuel that is contaminated, stale or incor-
rect octane number.
2. Carburetors/Injectors
•
Dirty or clogged flame arrester.
•
Malfunctioning automatic choke plate or faulty
adjustment of manual choke plate.
•
Worn float needle valve and seat.
•
High float level.
•
Incorrect idle mixture adjustment.
•
Dirty or worn injectors.
3. Ignition System
•
Fouled or worn spark plugs.
•
Worn points or incorrect gap on points.
•
Shorted or opened circuit high tension spark plug
cables.
•
Incorrect ignition timing.
4. General
•
Worn piston rings and valves.
•
Engine temperature - cold r unning engines
increase CO production. Engine cooling water sys-
tem design and selection of thermostat(s) are
primary considerations affecting engine operating
temperature. Generally, an engine produces less
CO if it operates at a relatively high temperature
within manufacturer’s specifications.
•
Exhaust Back-Pressure - certain alterations to the
exhaust system may increase engine exhaust back
pressure and CO production.
•
Restricted engine room or compartment ventilation.
CO Detectors
Even with the best boat design and construction, together
with the utmost care in inspection, operation and mainte-
nance, hazardous levels of CO may still be present in
accommodation spaces under cer tain conditions.
Continuing observation of passengers for symptoms of CO
intoxication can be supplemented by a marine grade alarm
type CO detector installed in the accommodation space.
1.14
FIGURE 1.9 THE EFFECT OF CANVAS
CONFIGURATIONS
