594-Dangers of Hydrogen Sulphide (H2S) / 748
D
an
g
ers of
Hy
dro
g
en Sul
ph
ide
BOS-PRD-03.900907
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
6 / 7
x
H
2
S detectors
shall
be provided and placed in various locations onboard the vessel, particularly on
the main working deck and areas where personnel are most likely to be exposed to any H
2
S
release;
x
Self contained, pressure demand or positive pressure respiratory equipment
shall
be provided for all
personnel including passengers;
x
The provided protective equipment is to be readily available, either by carrying in a dedicated pouch
or located and available at convenient positions around the vessel;
x
H
2
S is extremely flammable therefore pure oxygen respirators
shall never
be used;
x
Canister masks or cartridge respirators are not adequate or approved for use in H
2
S environments
and
shall never
be used;
x
Training
shall
be conducted for all personnel onboard prior to any engagement in known H
2
S areas
and all personnel
shall
be familiar with the use of and any limitations of the provided equipment;
x
Breathing bottles
should
only ever be recharged using air from a dedicated breathing air compressor
or from bottled breathing air. Oxygen or air from the vessel’s air system
shall never
be used.
4.
5
Wor
k
in
g
in
p
roxi
m
i
ty
t
o an Ins
t
alla
t
ion
w
i
th p
o
t
en
t
ial
H
2
S
x
Offshore installations operating where there is the potential for H
2
S have external warning alarm
systems in place to inform personnel of any H
2
S escape. Usually, the offshore units will also display
signs and notices to inform vessel crews and other persons visiting the unit location;
x
All personnel onboard
shall
be are aware of, and understand the meaning of, these signs and alarms
and what action to take in the event of any H
2
S escape;
x
Vessels
should
always work upwind of any possible sources of H
2
S and always approach known or
suspected H
2
S locations with caution after first checking with the
OIM
that it is safe to do so;
x
Vessel crews
should
, wherever possible, work as a team and avoid any single person working alone
in areas that are likely to come into contact with high concentration exposure of H
2
S.
4.
6
E
n
t
r
y
t
o an en
c
losed s
p
a
c
e
w
i
th p
o
t
en
t
ial
H
2
S
x
Reference
shall
be made to the Permit To Work # 4 Enclosed Space Entry as referenced in the
Permit To Work
Procedure. All entries
shall
be correctly planned and implemented with reference to
this procedure. There are no exceptions.
594