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8/8/2019 Enhancing Safety During Design Stage
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8/8/2019 Enhancing Safety During Design Stage
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2OFFSHORE DESIGN SECTION
ISO-9001:2000
Safety
General Definition :
Safety is the state of being
safe, the condition of being
protected against physical,
occupational events whichcould be considered non
desirable.
Safety of the personnel and of
the facility is one of the majorconcerns during the design of
the Offshore Platforms
.
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3OFFSHORE DESIGN SECTION
ISO-9001:2000
Safety aspects in
DESIGN
The safety aspects considered in the Design are:
a. Safety studies and risk assessment
b. General safety features Platforms &Pipelines.
c. Safety of personnel
Suitable functional specifications adopted based on:international codes , practices and recommendations /
suggestions of MDT
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4OFFSHORE DESIGN SECTION
ISO-9001:2000
A. Safety Studies and RiskAssessment
ALARP (as low as reasonable practicable) level is
achieved by
Field and layout review
Coarse quantified risk assessment
Hazard Identification (HAZID) Workshops
Hazard and Operability (HAZOP) studies.(Contd)
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5OFFSHORE DESIGN SECTION
ISO-9001:2000
A. Safety Studies & RiskAssessment (Contd)A
Safety Integrity Level (SIL) assessment
Consequence studiesEmergency system reviews
Escape and rescue analysis
Quantified Risk Assessment (QRA)
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6OFFSHORE DESIGN SECTION
ISO-9001:2000
B. General safety features on
UNMANNED PLATFORMS
Structural protection
Judicial layout of topside and field complex.
Pipeline and riser design.
Minimization of potential hydrocarbon release sources.Control of ignition sources.
Identification of fire zones.
Fire and gas detection systems.
(Contd)
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7OFFSHORE DESIGN SECTION
ISO-9001:2000
B.General safety features on
UNMANNED PLATFORMS Contd..
Emergency control systems.
Fire control and mitigation.
Explosion control and mitigationAlarms and communication systems
Escape and evacuation.
Protection against occupational hazards.
Material selection
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8OFFSHORE DESIGN SECTION
ISO-9001:2000
C. Safety of Personnel
Personnel safety & communication equipments :
Fire fighting
Rescue equipmentBreathing apparatus sets.
Stretchers.
Eye wash and safety showers.
First aid kit.
Paging system.
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9OFFSHORE DESIGN SECTION
ISO-9001:2000
Safety Aspects in Process Design
Fail safe design.
Two levels of safety (alarm & shutdown).
Safe disposal of relieved hydro carbon (automatic or
manual).
Efficient liquid hydrocarbon / chemical drainage.Fire water sprinkler system for cooling in case of fire.
Following
API RP 14C, 14G, 14F
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10OFFSHORE DESIGN SECTION
ISO-9001:2000
Safety aspects in Instrumentation
System Design
Gas detection system (hydrocarbon / H2S / Hydrogen )
Fire detection system ( SIL -3)Platform control system DCS- PP,SDP- WP
ESD & FSD
Suitable ingress protection provided- e.g.IP-52
Suitable explosion proof enclosures where reqd
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11OFFSHORE DESIGN SECTION
ISO-9001:2000
Safety Aspects in Electrical Design
API RP 500 followed for area classification, gas
groups, temperature classification.
Uninterrupted power supply for critical loads
Fault level calculations - Protective switch gear
Earthing / grounding - IEEE 142.Suitable ingress protection provided- e.g.IP-52
Suitable explosion proof enclosures where reqd.
(Contd)
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12OFFSHORE DESIGN SECTION
ISO-9001:2000
Safety Aspects in Electrical Design
Contd...
Lighting transformer - to ensure
personal safety
Corrosion prevention for jacket and pipelines- DNV RPB 401.
Navigational aids - international association
of light house authority (IALA).
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13OFFSHORE DESIGN SECTION
ISO-9001:2000
Safety Aspects in Piping Design
International codes and standards - ASME
B31.3, 31.4, 31.8, API RP 14E, 14C, 14G are
followed.
Thermal insulation provided for personnelprotection.
Handrails and access platforms for safe
operation.
Valves in hydrocarbon service - fire safe
design. Chemical hoses are fire resistant.
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14OFFSHORE DESIGN SECTION
ISO-9001:2000
Safety Aspects in Structural Design
International codes API RP 2A, API RP 2L/ICAO etc.
are followed.
Platform Structural design : FOS -1.5 under 100 yearsextreme storm conditions and FOS 2 for Operating
storm conditions. Most stringent is considered..
Riser protector and barge bumper provided.
Fire wall Isolation between Well area and others.
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15OFFSHORE DESIGN SECTION
ISO-9001:2000
Safety Aspects in Structural Design
VESSEL COLLISION:-API Guideline:
IMPACT ENERGY (REF API RP2A CL.18.9.2 ):-
KINETIC ENERGY E= 0.50aMV2
a-ADDED MASS- 1.4 FOR BROAD SIDE COLLISION & 1.10 FOR
BOW/STERN COLLISION, M- VESSELMASS ;
V-VELOCITY OF VESSEL IMPACT
MINIMUM SPECIFIED REQUIREMENT:
IMPACT OF 1000MT VESSEL AT IMPACT VELOCITY OF 0.50M/SEC.
(EQUIVALENT TO A TYPICAL 180-200 FEET LONG SUPPLYVESSEL IN GULF OF MEXICO.)
VESSEL MASS TO BE INCREASED OR DECREASED FOR DEEPER
AND SHALLOW LOACTIONS RESPECTIVELY.
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16OFFSHORE DESIGN SECTION
ISO-9001:2000
Safety Aspects in Structural Design
Design criteria Riser protector
Capability to absorb 100 TM energy on impact
Protector should be minimum 300 mm clear
distance away from riser Easily removable/ replaceable
Sign board DO NOT BERTH to dissuadeberthing of vessels
Typical Level: (-) 1.80 m to (+) 6.00 m
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17OFFSHORE DESIGN SECTION
ISO-9001:2000
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18OFFSHORE DESIGN SECTION
ISO-9001:2000
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19OFFSHORE DESIGN SECTION
ISO-9001:2000
Safety Aspects in Structural Design
Typical Riser Protector
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21OFFSHORE DESIGN SECTION
ISO-9001:2000
Safety Aspects in Structural Design
Typical Boat Landing & Barge Bumper
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22OFFSHORE DESIGN SECTION
ISO-9001:2000
Safety Aspects in Structural Design
Design criteria Barge bumper
Design to absorb 30.0 TM impact energy in middle 1/3
of post
Design to absorb lateral vessel impact of 11.0 TM
energy in middle 1/3 of the post
Typical Level: (-) 2.0 m to (+) 6.5 m
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23OFFSHORE DESIGN SECTION
ISO-9001:2000
Safety Aspects in Pipeline Design
International codes DNV OS-FS101, DNV RPB-401,
API 1104, API 1110, 1111 are followed.
Stability analysis, stress analysis, collapse and
buckling analysis etc. are carried out during design.
External corrosion protection by coat wrap along with
CP.
All pipeline hydro tested to ensure capability of
withstanding maximum operating pressure.
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24OFFSHORE DESIGN SECTION
ISO-9001:2000
Safety Aspects in Mechanical
Equipment Design
Pressure vessels are designed in accordance with
ASME Code section VII DIV.1.
Rotating equipments are specified in accordance with
related API codes and recommended practices.
Evacuation / escape routes are marked withluminescent paints for easy identification.
Condition monitoring instrumentation provided with
all critical items larger than 150 KW consistent with
accepted industrial norms.
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