419-Tank cleaning Operations / 748
Tan
k
Cleanin
g Op
erations
BOS-PRD-03.900603
4
.
2
.
4 V
entilation
Confined spaces
shall
be ventilated using designated ventilation equipment; ensuring that ventilation
reaches the bottom of the space.
4
.
2
.
5 A
t
m
os
p
h
ere Test
The atmosphere in the confined space
shall
be tested using in date calibrated test equipment. The test
shall
be carried out in various areas of the space.
4
.
2
.
6 Ex
itin
g
Prior to exiting the space a thorough inspection of the whole area
shall
be carried out. All tools, equipment
and other materials
shall
be removed. The safety attendant
shall
recover the tools, equipment and materials
from outside the space.
The space
shall
be re-secured, isolations re-instated and the PTW cancelled.
4
.
2
.
7
Tan
k
c
leanin
g
–
u
sin
g
t
h
e s
h
i
p’
s
c
rew
The
C
h
ie
f Off
i
c
er/Tas
k
Sup
ervisor
shall
give the Toolbox Talk. In addition to the standard Tool Box Talk
content; specific to tank cleaning, the inherent dangers associated with engine room access, working in
confined space and the routing of hoses
shall
be fully discussed. The previous content of the tank, the
Emergency Response Plan and communications requirement
shall
all be highlighted,
Tanks to be cleaned
shall
be isolated from any tanks which still contain bulk liquids. Lock-out/Tag-out Permit
To Work (Section 9)
shall
be used as appropriate.
Mechanical apparatus in any tanks to be cleaned are to be mechanically/electrically isolated using Lock-
out/Tag-out Permit To Work (Section 9).
Where access to tanks is via the engine room, all non-vital machinery is to be switched off and isolated using
Lock-out/Tag-out Permit To Work (Section 9). Sources of ignition are present in the engine room which
shall
be taken into consideration.
MSDS sheets pertaining to previous cargo carried since the last cleaning operations
shall
be made available
to the tank cleaners.
“MARPOL 73/78 ANNEX II”
regulates the discharge of Noxious Liquid Substances and the use of chemicals
that are used for tank cleaning purposes. All cleaning additives evaluated and found to meet the
requirements of “
paragraph 13.5.2 of Annex II of MARPOL 73/78”
are consolidated into “
annex 10 of the
MEPC.2/Circular 15”.
Some substances mentioned on a vessel’s Noxious Liquid Substances certificate require approved
surveyors in attendance during tank cleaning, for example zinc bromide. When applicable, further risk
assessment
shall
be carried out, especially for silica based cements.
The tank
shall
be cleaned using the appropriate methods.
4
.
2
.
8
Tan
k
c
leanin
g
–
u
sin
g
s
h
ore
c
ontra
c
tors
It is the responsibility of the
Master
to provide the contractors with a safe place of work.
The
Master
is ultimately responsible for the safe completion of the work.
When contractors are used instead of own crew, 4.2.7 as mentioned above
shall
remain applicable.
Version 04. Original date: 22/06/2012. Version date: 31/12/2014. Valid version only on QMS site. Uncontrolled document when printed.
Procedure prepared by: BOS Deputy QHSE Manager. Approved by: BOS QHSES Manager. Validated by: BOS Quality Representative
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