Process Safety Mgm Tml
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Transcript of Process Safety Mgm Tml
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Process Safety Management in
Marketing locations
Design of Fire Safety System in POL Locations
Critical Safety issues in Marketing locations
Striving for improved performance
A.K.Gupta
DGM(HSE) CO , IOCL
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Design of Fire Safety System in POL Locations
OISD 117
OISD 244 ( Draft V)
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Design of Fire Safety System in POL Locations
Stipulations in OISD Standards needing special attention
Two largest Fire contingencies if total tankage > 30 TKL
Area - I Area - II
14, 12h
28, 14h
14, 12h
29, 15h
10m
10m 10m
12m
Largesttank
Largest
tank
18, 14h18, 15h
18, 14h
18, 14h
18, 14h18, 14h
10m
10m
10m
10m
Cone Roof Tank Farm Floating Roof Tank Farm
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Design of Fire Safety System in POL Locations
(A)Fire water requirement for area I ( Tank farm containing CR Tanks )
Cooling ( exposure protection) X-1 Full surface fire ( foam application @ 5 lpm/m2) X-2
Supplementary water ( 4X36 M3/Hr ) X-3
Total X
OISD does not envisage fighting Full surface fire in CR tanks using
HVLRMs while working out fire water requirement.
Area - I
Largest
tank
18, 14h18, 15h
18, 14h18, 14h
18, 14h18, 14h
10m
10m
10m
10m
Cone Roof Tank Farm
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Design of Fire Safety System in POL Locations
(B) Fire water requirement for area II ( Tank farm containing FR Tanks )
Cooling ( exposure protection) * Y-1
Rim seal fire ( foam application @ 12 lpm/m2) Y-2
Supplementary water ( 4X36 M3/Hr ) Y-3
Total Y
* Tank on Fire 29 M X 15 M being largest
Area - II
14, 12h
28, 14h
14, 12h
29, 15h
10m
10m 10m
12mLargest
tank
28 M X 14 M ( more cooling water required)
NO
Floating Roof Tank Farm
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Design of Fire Safety System in POL Locations
(C) Fire water requirement FR Tank on full surface Fire
Cooling ( exposure protection) Z-1 (= Y-1)
Full surface Fire ( foam application @ 8.1 lpm/m2) $ Z-2
Supplementary water ( 4X36 M3/Hr ) Z-3
Total Z
$ - Potential foam losses from wind and other sources to be
added as per design requirement
Fire Water Required:
Z if Z > X+Y
X+Y if Z< X+Y
One FR Tank on full surface fire equivalent to Two Largest
Fire contingencies
( HOW MUCH ? )
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Design of Fire Safety System in POL Locations
Minimum residual pressure of7 kg / cm2 (g) at hydraulicallyremotest point
Head loss in each segment should be based on design
flow in that segment to arrive at residual pressure at
hydraulically remotest point.
A
BC
DE
Hydraulically
remotest
point
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Design of Fire Safety System in POL Locations
Spray nozzles be directed radically at a distance not
exceeding 60 cm from Tank surface
TANK
Sprinkler system> 60 cm
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Design of Fire Safety System in POL Locations
Clause 4.3.7 (j) Well laid procedures & plans shall be made & put intouse of HVLRMs to combat emergency without loss of time.
Special attention required for Foam recoupment arrangement
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Design of Fire Safety System in POL LocationsWhat if all tanks are in a single dyke?
R +
30
R +
30
Some tanks may not be within horizontal range of HVLRMs
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Design of Fire Safety System in POL LocationsFire water ring around tank in two parts
Tank onFire
> 30 M
Activate this part only
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Design of Fire Safety System in POL Locations
Common observations needing correction / attention
RA to be done at the layout stage.
Mismatch of RPM of Fire Engine & pump
Fire Engine incapable of reaching desired RPM to deliver Q & H as
per design / requirement
Installation of remote control panels adjacent to HVLRMs.
Centralized Foam feeding arrangement
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Design of Fire Safety System in POL Locations
Inadequate pressure in Fire Hydrant
Inadequate replenishment capability of Fire Water
Incorrect placement of monitors
HVLRM not visible from Remote panel. Mismatch of designed heads of Fire pumps
Ineffective quality management of Fire Water
Fire system not working in Auto mode
Incorrect storage and handling of Foam and inadequate
foam inventory. Improper Mutual aid arrangement . Header to header
connection instead of header to water tank.
Common observations needing correction / attention
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Design of Fire Safety System in POL LocationsPoints to Ponder
Can requirement of Remote control, variable FlowHVLRMs be relaxed for IFRTs?
Fire water hydrant header size augmentation - 49 sq
inch to be augmented to 98 sq inch.
14
14 14
20
+
Existing Fire
Water Header
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Design of Fire Safety System in POL LocationsPoints to Ponder
Will it not be a good idea to provide manifold (for connecting portable
HVLRMs) on hydrant headers around Floating Roof Tanks dyke - To take care
of situation when a fixed HVLRM in critical position is rendered useless due
to wind velocity / malfunctioning etc.?
8m
15m
8m
8m
8m8m
8m
33m
T1 T3T2
1000 GPM HVLRM
1000 GPM HVLRM
10m 10m
T1, T2, T3 Tanks with 18 m
dia and 16 m height
Hydrant Line
8m 8m
48m33m
Issues: 1.Limitation of jet throw
2. What if monitor malfunctions
3. No variable flow required
4. Better flexibility available in case of mobile equipment.
5. Minimum 4 fixed 1000 GPM HVLRMs required. 1 portable 1000 GPM HVLRM would have worked.
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Design of Fire Safety System in POL Locations
Points to Ponder contd
What is impact of wind velocity ( > 4 km / hr) or inlet pressure
< 7 kg / sq. M on performance of HVLRMs ?
Criteria to be followed for positioning of a fixed HVLRM in
such a way that it can be operated manually.
Can we relax requirement of variable flow, remote control
features of HVLRMs and make it need based ?
Circumstances under which a location to be treated as notmeeting safety distance norms as per OISD for the purpose of
provision of fixed HVLRMs
Training needs / SOPs
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