621-Hygiene / 748
H
ygiene
BOS-PRD-0304.900902
Minimum cleaning standards -
shall
include all of the following:
• Physically clean;
• Touch up coating as necessary;
• Fill tank with a solution of super chlorinated water at a concentration of 50 ppm chlorine and
leave for a period of not less than 4 hours;
Certain operators have a requirement for this solution to be kept on board for 10 hours;
• Discharge tank completely;
• Flush out with clean potable water;
• Discharge tank completely;
• Fill with potable water;
All pumps and pipe work
should
be flushed through with the super chlorinated water and then with clean
potable water prior to filling tanks.
M
a
in
t
en
a
nce of
H
oses
U
sed
for
t
h
e
T
r
a
nsfer of C
a
rgo
P
o
tab
l
e
W
at
er
Only dedicated hoses
should
be used for the transfer of cargo potable water. When not in use, hoses
should
be stored in such a way to avoid contamination.
The quality of the water
should
be checked frequently. Fresh water generated onboard
should
be treated
and checked as per the water plant manufacturers instructions.
A reasonably foreseeable risk of exposure to Legionella bacteria exists in hot and cold water systems. Risk
areas for Legionella disease of these systems are located at water outlets where aerosol formation can exist
during operation or when being maintained.
To reduce the possibility of creating conditions in which the risk from exposure to Legionella bacteria is
increased, it is important to control the risk by introducing measures that do not allow proliferation of the
organisms in the water system.
Proliferation of Legionella depends on the following risk-areas:
x
Temperature: A temperature between 25 and 50 degrees Celsius (minimum temperature at the
outlet of warm water system
shall
be at least 60 degrees Celsius);
x
Period: A long stay period of water (stagnated) or still water in the system;
x
Soil: The presence of a biological layer and sediment as medium for growing.
A simple risk assessment may show that the risks are low and in such case no further action
should
be
necessary.
4
.
7
.1 I
den
t
ific
at
ion
a
nd
a
ssessing so
u
rces of
ris
k
Risk identification and assessment
shall
be done onboard.
MI
C
ROBIOLOGI
C
AL AND
C
HEMI
C
AL TE
S
T RE
Q
UIREMENT
S
B
a
c
t
erio
l
ogic
a
l
Q
ua
l
i
t
y
G
u
id
a
nce
/
C
h
e
m
ic
a
l P
a
r
a
m
e
t
er
R
eq
u
ired
T
es
t
L
i
m
i
t
Enterococci 0 /100ml
E.coli 0 /100ml
Coliforms 0 /100ml
Hydrocarbons < 10 ppb
Chlorides <250 mgCl/l
Co
l
ifor
m
s
/ E.
Co
l
i
/ E
n
t
erococci
Legislation limit is 0 counts per 100ml.
These indicator organisms are used to assess the microbiological quality of water as reliable indicators are
not available for many other pathogens. The use of the indicator bacteria, E.coli, Enterococci and coliforms,
as a means of assessing the potential presence of water borne pathogens is paramount for checking water
Version 04. Original date: 25/05/2012. Version date: 31/12/2014. Valid version only on QMS site. Uncontrolled document when printed.
Procedure prepared by: BOS QHSE Coordinator. Approved by: BOS QHSES Manager. Validated by: BOS Quality Representative
11 / 18
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