787/ Dangers of Hydrogen Sulphide / 992
Dan
g
ers of
H
y
dro
g
en Sul
p
h
ide
BOS-
P
RD-0
3
.90090
7
4
Descri
p
tion
4
.1 Dan
g
ers of
H
2
S
x
H
2
S i
s
an
e
x
treme
l
y
to
xic
gas
t
h
at
nat
u
ra
ll
y
o
cc
u
rs
i
n
some
s
u
b
-
sea
o
ff
s
h
ore
dr
illi
ng
and
e
x
p
l
orat
i
on
a
c
t
i
v
i
t
i
es
;
x
H
2
S
ma
y
a
l
so
be
present
i
n
u
nvent
il
ated
spa
c
es
wh
ic
h
h
ave
c
onta
i
ned
ba
ll
ast
w
ater
wh
ic
h
h
as
be
c
ome
stagnant
d
u
e
to
t
h
e
rott
i
ng
o
f
organ
ic
mater
i
a
l i
n
t
h
e
w
ater
;
x
H
2
S
h
as
t
h
e
h
i
g
h
est
l
eve
l
o
f
to
xici
t
y
o
f
a
ll
nat
u
ra
ll
y
o
cc
u
rr
i
ng
gases and
even
i
n
sma
ll
amo
u
nts
,
h
as
a
strong
s
u
l
p
hu
r
sme
ll
t
h
at
i
s
c
omparab
l
e
to
t
h
at
o
f
“
rotten eggs
”;
x
H
2
S i
s
h
eav
i
er
t
h
an a
i
r and
t
h
ere
f
ore
w
ill
be
c
ome more
c
on
c
entrated
i
n
nearer
t
h
e
de
ck
or
gro
u
nd
;
x
H
2
S i
s
a
l
so
e
x
p
l
os
i
ve
wh
en
c
omb
i
ned
w
i
t
h
a
i
r
at
a
range bet
w
een
4.
3
to
4
5
.
5 per
c
ent b
y
vo
l
u
me
.
4
.
2
T
h
e identification of
H
2
S
x
Cl
ose
li
a
i
son
shall
be
c
ond
u
c
ted
bet
w
een
t
h
e
vesse
l
Master
and
t
h
e
Offs
h
ore
I
nstallation
Mana
g
er
(
O
I
M
)
to
ens
u
re
t
h
at
an
y
potent
i
a
l
areas
t
h
at ma
y
be
e
x
pe
c
ted
to
prod
u
c
e
H
2
S
are
fu
ll
y
c
omm
u
n
ic
ated
;
x
T
h
e
sme
ll
o
f
“
rotten
eggs
” i
s
t
h
e
i
n
i
t
i
a
l
f
a
c
tor
wh
ic
h
i
dent
i
f
i
es
t
h
e
presen
c
e
o
f
H
2
S. W
h
en
t
h
i
s
o
cc
u
rs
t
h
e
Master
,
Base Mana
g
er
and
C
ontracts Mana
g
er
shall
be
i
n
f
ormed
.
A
t
t
h
i
s
stage
t
h
e
c
on
c
entrat
i
on
w
ill
be
be
l
o
w 1
0
ppm
;
x
S
h
o
u
l
d
t
h
e
sme
ll
o
f
“
rotten
eggs
”
s
u
bse
q
u
ent
l
y
d
i
sappear
t
h
i
s
shall
not
be
i
nterpreted
t
h
at
t
h
e
H
2
S
c
on
c
entrat
i
on
h
as
de
c
reased
.
A
s
t
h
e
c
on
c
entrat
i
ons
i
n
c
reases
,
so
t
h
e
ab
ili
t
y
to
sme
ll i
t
de
c
reases
.
A
n
y
s
i
gns
o
f
d
i
zz
i
ness
or
c
o
u
g
h
i
ng
should
be
i
mmed
i
ate
l
y
i
nterpreted
as
a
r
i
s
i
ng
c
on
c
entrat
i
on
.
D
eat
h
c
an
q
u
ickl
y
f
o
ll
o
w
s
h
o
u
l
d t
h
e
c
on
c
entrat
i
on
c
ont
i
n
u
e
to
r
i
se
above
5
0
ppm
.
4
.
3
T
h
e effects of
H
2
S
C
oncentration
E
ffect
0 –
1
0
ppm
S
me
ll
o
f
“
rotten
eggs
”
I
rr
i
tat
i
on
o
f
t
h
e e
y
es
,
nose
and
t
h
roat
1
0 –
5
0
ppm
S
me
ll
o
f
“
rotten
eggs
”
de
c
reases
H
eada
c
h
e
Di
zz
i
ness
N
a
u
sea
and
vom
i
t
i
ng
C
o
u
g
h
i
ng and
breat
h
i
ng d
i
ff
ic
u
l
t
y
More
t
h
an
5
0
ppm
S
me
ll
o
f
“
rotten
eggs
”
d
i
sappears
S
h
o
ck
C
onv
u
l
s
i
on
C
oma
D
eat
h
V
ers
i
on
0
5
. O
r
i
g
i
na
l
date
:
25
/0
5
/
2
0
1
2
.
V
ers
i
on
date
:
31
/
1
2
/
2
0
1
5
.
V
a
li
d
vers
i
on
on
l
y
on
Q
M
S
s
i
te
.
U
n
c
ontro
ll
ed do
c
u
ment
wh
en
pr
i
nted
.
P
ro
c
ed
u
re prepared b
y
: BOS
Q
HS
E
C
oord
i
nator
.
A
pproved
b
y
: BOS
Q
HS
E
Manager
.
V
a
li
dated
b
y
: BOS
Qu
a
li
t
y
R
epresentat
i
ve
5
/
7
787