Annexure 2: Rapid Risk Assesment RISK ANALYSIS

Transcription

1 RISK ANALYSIS (I) Catastrophic Rupture of LPG Bullet Truck (18 MT) At the LPG bottling plant, LPG will be transported by Bullet Truck tank. In the event of fire in LPG bullet truck in parking area, BLEVE may be occurred and fireball will result as out come. I. Release Rate and Release Duration Release Rate Release rate is not applicable as under BLEVE, total Inventory of LPG will result in Fireball. II. Fireball Hazard as a Result of BLEVE Catastrophic rupture of LPG bullet truck followed by immediate ignition will result in occurrence of BLEVE. As outcome of BLEVE, fireball will outcome as per details given below: Fireball Radius m Fireball Duration s Flame Emissive Power kw/m 2 Fireball Lift Off Height m III. Thermal Radiation Effect From Fireball Ellipse Thermal radiation levels at various distances from fireball ellipse are given below: Radiation Level Thermal Radiation Level Distances (m) 37.5 kw/m kw/m kw/m Thermal radiation intensity radii due to fireball ellipse are shown in Figure

2 Figure 1.1: Intensity Radii for Fire ball Rupture of LPG Bullet Truck IV. UFL and LFL Concentration Distances In the event of no ignition of released LPG, vapour cloud will be formed and concentrations within UFL and LFL will occur at following distances. Concentration UFL and LFL Concentration Distances (m) UFL LEL V. Flash Fire Envelope On ignition of vapour cloud within UFL and LFL concentrations, flash fire envelope will form as given below: Flash Fire Envelope (m) B 3 m/s D - 3 m/s E - 2 m/s Farthest Lateral Extent

3 Flash fire envelopes due to delayed ignition rupture of LPG bullet truck are presented in Figure 1.2. Figure 1.2: Flash Fire for Rupture of LPG Bullet Truck 3

4 VI. Explosion Effects (Delayed Ignition) LPG vapours within the range of UFL and LFL will be formed an explosive mass and result in overpressure wave on getting source of ignition, if some confinement is present. Overpressure distances for various intensities of pressure wave are as given below: Over Pressure (bar) Overpressure Distances (m) Late explosion worst case radii due to delayed ignition as a result of rupture of LPG bullet truck are presented in Figure 1.3. Figure 1.3: Late Explosion Worst Case Radii for Rupture of LPG Bullet Truck 4

5 (II) Catastrophic Rupture of LPG Cylinder At the LPG bottling plant, Cylinders will be filled with LPG. In the event of fire in LPG cylinder, BLEVE may be occurred and fireball will result as out come. I. Release Rate and Release Duration Release Rate Release rate is not applicable as under BLEVE, total Inventory of LPG will result in Fireball. II. Fireball Hazard as a Result of BLEVE Catastrophic rupture of LPG cylinder followed by immediate ignition will result in occurrence of BLEVE. As outcome of BLEVE, fireball will outcome as per details given below: Fireball Radius 7.67 m Fireball Duration 1.70 s Flame Emissive Power kw/m 2 Fireball Lift Off Height m III. Thermal Radiation Effect From Fireball Ellipse Thermal radiation levels at various distances from fireball ellipse are given below: Radiation Level Thermal Radiation Level Distances (m) 37.5 kw/m kw/m kw/m

6 Thermal radiation intensity radii due to fireball ellipse of LPG Cylinder are shown in Figure 1.4. Figure 1.4: Intensity Radii for Rupture of LPG Cylinder IV. UFL and LFL Concentration Distances In the event of no ignition of released LPG, vapour cloud will be formed and concentrations within UFL and LFL will occur at following distances. Concentration UFL and LFL Concentration Distances (m) UFL LEL V. Flash Fire Envelope On ignition of vapour cloud within UFL and LFL concentrations, flash fire envelope will form as given below: Flash Fire Envelope (m) B 3 m/s D - 3 m/s E - 2 m/s Farthest Lateral Extent

7 Flash fire envelopes due to delayed ignition rupture of LPG Cylinder are presented in Figure 1.5. Figure 1.5: Flash Fire for Rupture of LPG Cylinder VI. Explosion Effects (Delayed Ignition) LPG vapours within the range of UFL and LFL will be formed an explosive mass and result in overpressure wave on getting source of ignition, if some confinement is present. Overpressure distances for various intensities of pressure wave are as given below: Over Pressure (bar) Overpressure Distances (m) Late explosion worst case radii due to delayed ignition as a result of rupture of cylinder are presented in Figure

8 Figure 1.6: Late Explosion Worst Case Radii for Rupture of LPG Cylinder (III) Central Column Failure of Carousel At the LPG bottling plant, cylinders will be filled with LPG. In the event of central column failure of carousel, LPG will be released and thermal radiation in the event of fire and flash fire due to delayed ignition will be occurred as out come. I. Release Rate and Release Duration Under this scenario, LPG release from central column failure of carousel has been considered. Release Rate E+000 k/s II. Thermal Radiation Effect From Jet Fire Thermal radiation levels at various distances from jet fire are given below: Radiation Level Thermal Radiation Level Distances (m) 37.5 kw/m kw/m kw/m

9 Thermal radiation intensity radii due to jet fire due to central column failure of carousel are shown in Figure 1.7 Figure 1.7: Intensity Radii for Central Column Failure of Carousel IV. UFL and LFL Concentration Distances In the event of no ignition of released LPG due to Central Column failure of carousel, vapour cloud will be formed and concentrations within UFL and LFL will occur at following distances. Concentration UFL and LFL Concentration Distances (m) UFL LEL UFL and LFL Concentration Height Concentration UFL and LFL Concentration Height (m) B - 3 m/s D - 3 m/s E 2 m/s UFL LEL

10 IV. Flash Fire Envelope On delayed ignition of LPG vapours within UFL and LFL, flash fire envelope will form as indicated below: Flash Fire Envelope (m) Distance Farthest Vertical Flash Fire Envelope (m) Height Farthest Vertical Flash fire envelopes due to Central Column failure of carousel are presented in Figure 1.8. VI. Explosion Effects (Delayed Ignition) No explosion hazard will occur under any stability class and wind speed due to this scenario. Figure 1.8: Flash Fire due to Central Column Failure of Carousel 10

11 (IV) LPG Leak from Gun at Carousel At the LPG bottling plant, cylinders will be filled with LPG. In the event of LPG leak from Gun at Carousel, LPG will be released and thermal radiation in the event of fire and flash fire due to delayed ignition will be occurred as out come. I. Release Rate and Release Duration Under this scenario, LPG release from leak Release Rate E-001 k/s II. Thermal Radiation Effect From Jet Fire Thermal radiation levels at various distances from jet fire are given below: Radiation Level Thermal Radiation Level Distances (m) 37.5 kw/m kw/m kw/m Thermal radiation intensity radii due to jet fire due to LPG leak from Gun at Carousel are shown in Figure 1.9. Figure 1.9: Intensity Radii for LPG Leak from Gun at Carousel 11

12 IV. UFL and LFL Concentration Distances In the event of no ignition of released LPG due to LPG leak from Gun at Carousel, vapour cloud will be formed and concentrations within UFL and LFL will occur at following distances. Concentration UFL and LFL Concentration Distances (m) UFL LEL UFL and LFL Concentration Height Concentration UFL and LFL Concentration Height (m) B - 3 m/s D - 3 m/s E 2 m/s UFL LEL IV. Flash Fire Envelope On delayed ignition of LPG vapours within UFL and LFL, flash fire envelope will form as indicated below: Flash Fire Envelope (m) Distance Farthest Vertical Flash Fire Envelope (m) Height Farthest Vertical Flash fire envelopes due to LPG leak from Gun at Carousel are presented in Figure

13 Figure 1.10: Flash Fire due to LPG leak from Gun at Carousel 13

14 I. Explosion Effects (Delayed Ignition) No explosion hazard will occur under any stability class and wind speed due to this scenario. (V) LPG Hose Failure at Carousel At the LPG bottling plant, cylinders will be filled with LPG. In the event of LPG hose failure at Carousel, LPG will be released and thermal radiation in the event of fire and flash fire due to delayed ignition will be occurred as out come. I. Release Rate and Release Duration Under this scenario, LPG release from hose failure at Carousel has been considered. Release Rate E-001 k/s II. Thermal Radiation Effect From Jet Fire Thermal radiation levels at various distances from jet fire are given below: Radiation Level Thermal Radiation Level Distances (m) 37.5 kw/m kw/m kw/m Thermal radiation intensity radii due to jet fire due to hose failure at Carousel are shown in Figure Figure 1.11: Intensity 14 Radii for Hose Failure of Carousel

15 IV. UFL and LFL Concentration Distances In the event of no ignition of released LPG due to hose failure at Carousel, vapour cloud will be formed and concentrations within UFL and LFL will occur at following distances. Concentration UFL and LFL Concentration Distances (m) B - 3 m/s D - 3 m/s E 2 m/s UFL LEL UFL and LFL Concentration Height Concentration UFL and LFL Concentration Height (m) B - 3 m/s D - 3 m/s E 2 m/s UFL LEL IV. Flash Fire Envelope On delayed ignition of LPG vapours within UFL and LFL, flash fire envelope will form as indicated below: Flash Fire Envelope (m) Distance B - 3 m/s D - 3 m/s E 2 m/s Farthest Vertical Flash Fire Envelope (m) Height B - 3 m/s D - 3 m/s E 2 m/s Farthest Vertical Flash fire envelopes due to hose failure at Carousel are presented in Figure VI. Explosion Effects (Delayed Ignition) No explosion hazard will occur under any stability class and wind speed due to this scenario. 15

16 Figure 1.12: Flash Fire due to Hose Failure of Carousel 1.2 LEAKAGES Jet Fire Maximum Exposure Duration = s Ambient temperature = 35C Maximum Distance = m Height above origin = 0.00 m Angle from Wind Direction = 0.00 deg Observer Inclination = Variable deg. Observer Orientation = Variable deg. 16

17 Fig 7.17: Radiation vs Distance for jet fire Leak The maximum heat radiation flux due to explosion reached KW/m2 and minimum heat radiation 0.20 KW/m2 as per the weather category 1.5/D at the source as per the graph. The explosion reached maximum distance at KW/m2 at m downwind distance as per the weather category 5/D. 17