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Hazard Evaluation cont'd - doe-std-3009-94_cn3_3-30-060059
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Table 3-2. Hazard analysis Worksheet based on failure modes and effects analysis


DOE-STD -3009-94
Table 3-1. Example process hazard analysis worksheet
Facility: Example Refinery
Date: 04/07/90
Page 3 of 30
Area:
HF Alkylation
Unit:
Unloading HF from Supply Tanker
Hazard
Cause
Protection and
Consequence
Ranking
Action item/
mitigative systems
Comment
(1) Anhy-
(1) Leak at
(A) Operators in
(1) Minor operator
(1) HIGH
4
(1) Verify that
drous HF,
connec-
chemical suits with
exposure LOW.
procedures provide
(2) MEDIUM
2
5,000
tion point.
respirators for
consistent leak-
gallons.
emergency use.
(2) Minor operator
check on fitting.
(2) HF hose
exposure off site
(3) LOW
3
(2) <100
ruptures.
(B) Specific
<ERPG-2 LOW.
(2) Verify that
psi
procedures, trained
(4) (a) MEDIUM
2
procedures provide
(3) HF hose operators.
(3) Operator
potential
appropriately
(4) (b) LOW
3
energy
ruptures,
exposure, possibly
defined interaction
from
flow not
(C) HF detectors.
ERPG-2 off site
between plant
(5) (a) LOW
1
immedi-
personnel and truck
MEDIUM.
ately shut
(D) HF line remote
blanket.
operators.
shutoff valve on
(4) Typically (a)
(5) (b) LOW
3
off.
truck.
LOW if capped.
(3) Area should be
(6) LOW
6
(4) Truck
Possibly (b)
roped off and
relief valve (E) Emergency
MEDIUM if not
access controlled
(7) MEDIUM
2
fails ope n.  relief valve capping
capped and no
during unloading.
kit available.
deluge.
(8) See #5
See item
(5) Truck
(4) Specific
#5
relief valve (F) Two N2 pressure
(5) Typically (a)
evacuation routes
regulators.
opens;
LOW if short
for operators
(9) HIGH
4
over-
duration. Possibly
should be defined
(G) Check valve on
pressure
(b) MEDIUM if
in procedures.
conditions.  N2 gas line.
longer and no
change.
Maximum N2
(6) Tanker
pressure less than
failure from
(6) Possible
tanker design
over-
operator fatalities
pressure.
pressure.
and ERPG-3 off site
HIGH.
(7) N2 hose (H) Emergency
water deluge
ruptures.
(7) N2 leak LOW.
system.
(8) See item #5
(8) N2 hose
above.
ruptures,
check valve
(9) Minor operator
fails.
exposure LOW.
(9) HF line
not swept
after
unloading.
Page 35


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