drillsafe 09-10 stena green performance stds
TRANSCRIPT
8/12/2019 Drillsafe 09-10 Stena Green Performance Stds
http://slidepdf.com/reader/full/drillsafe-09-10-stena-green-performance-stds 1/24
Effective management of
safety critical equipment
(SCE) – Practical Lessons
8/12/2019 Drillsafe 09-10 Stena Green Performance Stds
http://slidepdf.com/reader/full/drillsafe-09-10-stena-green-performance-stds 2/24
Agenda
• Solid foundation, what you don’t know can hurtyou
• Practical analysis, rig (and risk) based assessment
• Performance standards, not standardperformance, specific measureable and supportedby the Safety Management System (SMS)
• Codes and standards, they are there for a reason
• Continuous improvement.
8/12/2019 Drillsafe 09-10 Stena Green Performance Stds
http://slidepdf.com/reader/full/drillsafe-09-10-stena-green-performance-stds 3/24
But First – A Quote
“When anyone asks me how I can best describe myexperience of nearly 40 years at sea, I merely say
uneventful.
Of course there have been winter gales and storms and fog
and the like, but in all my experience, I have never been inan accident of any sort worth speaking about. I have seen
but one vessel in distress in all my years at sea. I never saw
a wreck and have never been wrecked, nor was I ever in any predicament that threatened to end in disaster of any sort”
Stena Clyde OIM some time before the engine room fire?
8/12/2019 Drillsafe 09-10 Stena Green Performance Stds
http://slidepdf.com/reader/full/drillsafe-09-10-stena-green-performance-stds 4/24
No…Captain of the Titanic, E. J. Smith, a few years before theTitanic sank.
One of our greatest risks is complacency!!
Despite having what we thought was a robust safetycase (after all, we’d had one for years), the lives of 100people were put at risk. As a direct result of the engine
room fire, we took a different approach to assessingsafety critical equipment adequacy which resulted insignificant improvements in our understanding of thisequipment and our management system arrangements.
8/12/2019 Drillsafe 09-10 Stena Green Performance Stds
http://slidepdf.com/reader/full/drillsafe-09-10-stena-green-performance-stds 5/24
Solid Foundation
• Safety case facilities description focused on the
wrong type of detailed information
• Lack of in depth understanding of SCE and their role
in preventing and controlling major accident events• Lack of understanding regarding systems / process
safety
• Detailed review and documentation of each SCE.Focus on operability, inter- dependency and
potential failure mechanisms / limitations
8/12/2019 Drillsafe 09-10 Stena Green Performance Stds
http://slidepdf.com/reader/full/drillsafe-09-10-stena-green-performance-stds 6/24
Practical SCE Analysis
• Safety case emergency systems survivability
analysis (ESSA) high levels with no detailed
understanding of system boundaries and
function
• Rig crew unfamiliar with a number of the SCE
• Performance standards not linked to any
analysis – off the shelf
8/12/2019 Drillsafe 09-10 Stena Green Performance Stds
http://slidepdf.com/reader/full/drillsafe-09-10-stena-green-performance-stds 7/24
8/12/2019 Drillsafe 09-10 Stena Green Performance Stds
http://slidepdf.com/reader/full/drillsafe-09-10-stena-green-performance-stds 8/24
SCE Analysis Approach
Practical outputs:
•What isimportant?
•What does it have
to do?•What do we needto it ensurereliability
•Monitoring-routine testing
• Auditing-
Inspection
Rig Drawings, Safety
Case, Workshops, SCE
Performance Standards
Safety Case MAEs,
Other System Failures
Vulnerability, Failure to
Safety, Redundancy
Describe SCE
Function and
Boundaries
Identify Potential
Failure Modes
Identify Causes
Assess Failure
Effects
Determine
Criticality
F un c t i on al P er f or m an c e S t an
d ar d s
M ai n t en an c e ,I n s p e c t i on an d T e s t i n gA
s s ur an c eT a s k s
8/12/2019 Drillsafe 09-10 Stena Green Performance Stds
http://slidepdf.com/reader/full/drillsafe-09-10-stena-green-performance-stds 9/24
SCE Analysis – Example System Block
Diagram (Firewater)
Engine Cooling Water /
Seawater Tank X-over
Vavles
Generator Cooling Pump
No. 2
Firewater Tank
Level Control and Alarms
General Service Pump
General Service Pump
Water from
Ballast Water
or Generator
Cooling Water
PumpsWater return
from Main
Generators
Sea Chest
Ring Main
Emergency Fire Pump
Fire Pump
Acc omm odation
Sprinkler System
Fire Hose Stations
Fire Hydrants
Forward Lifeboat Muster
Area Del uge Sy stem
Drill Floor Deluge System
Anc hor Win ch Delug e
System
Helideck Foam Cannons
Helifuel Foam System
Aft Lif eboat Mus ter A rea
Deluge System
8/12/2019 Drillsafe 09-10 Stena Green Performance Stds
http://slidepdf.com/reader/full/drillsafe-09-10-stena-green-performance-stds 10/24
SCE Analysis – Example System Layout
Diagram (Firewater)
8/12/2019 Drillsafe 09-10 Stena Green Performance Stds
http://slidepdf.com/reader/full/drillsafe-09-10-stena-green-performance-stds 11/24
SCE Analysis – Outputs
• Significantly improved understanding of SCE
by the rig crew
• Robust documentation of SCE for other crew
members / new staff
• Useful performance standards – Rig crew can
make informed decisions as to the
effectiveness of the SCE
• Monitoring- functionality testing of all systems
– and yes there were some surprises here
8/12/2019 Drillsafe 09-10 Stena Green Performance Stds
http://slidepdf.com/reader/full/drillsafe-09-10-stena-green-performance-stds 12/24
Performance StandardsBefore:
• Individual PS incomplete (not all critical equipmentincluded), non specific, criteria not measurable, no
linkage with the SMS
After:
• Covered all critical components, very specific and
measurable criteria, clear assurance tasks that can be
linked to the SMS
• Increased knowledge of inter-dependent systems• Effect of a Major Accident Event on the SCE
survivability and function
8/12/2019 Drillsafe 09-10 Stena Green Performance Stds
http://slidepdf.com/reader/full/drillsafe-09-10-stena-green-performance-stds 13/24
Performance Standards - Before
8/12/2019 Drillsafe 09-10 Stena Green Performance Stds
http://slidepdf.com/reader/full/drillsafe-09-10-stena-green-performance-stds 14/24
Performance Standards - AfterPERFORMANCE STANDARD: SCE-09 Performance Objective: To provide means of p rotection
for fire-fighting (water, foam and CO2) in all r elevant
areas on the rig in sufficient quantities. ACTIVE FIRE PROTECTION
SYSTEM OVERVIEW
Acti ve Fi re Protect ion (SCE-09) on the Stena Cl yde i nvolv es i nclud es t he fir ewater system, foam system and CO2 fire
protection system. The following block diagrams provide a visual overview of the Active Fire Protection systems.
Engine Cooling Water /
Seawater Tank X-overVavles
Generator Cooling Pump
No. 2
Firewater Tank
Level Control and Alarms
General Service Pump
General Service Pump
Water from
Ballast Water
or Generator
Cooling WaterPumps
Water return
from MainGenerators
Sea Chest
Ring Main
Emergency Fire Pump
Fire Pump
Accom modat ion
Sprinkler System
Fire Hose Stations
Fire Hydrants
Forward Lifeboat Muster
Area Delu ge System
Drill Floor Deluge System
Ancho r Winc h DelugeSystem
Helideck Foam Cannons
Helifuel Foam System
Aft L ifeboat Muster Area
Deluge System
Release Mechanism
CO2 Bottles
Port Propulsion Room
Starboard Propulsion
Paint Locker
Control Room
Engine Room / Auxiliary
Machinery Room,
Mechanics Store and
Separator Room
Emergency Generator
House
Emergency Switchboard
Room
FUNCTIONALITY – FIREWATER SYSTEM
Performance Criteria Basis Performance Verific ation - Assurance Tasks
FUNCTION 1: To provide firewater storage and supply for main and emergency fire pumps in sufficient quantities.
1. The firewater tank shall be maintained at
minimum 2/3 full.
Design Basis Test generator cooling pump # 2 cross over valves to
supply the emergency fire water pump directly. Confirm
actuation results in water flow from appropriate pumps
(Tag Proc. ME224-01)
Function test level control alarm for firewater tank (Tag
Proc. ME224-01)
2. The generator cooling pump #2 can be
switched over manually to provide water
directly to the suction of the emergency
firewater pump.
Design Basis Test operation of air conditioning cooling water pump
automatic cross over valves to supply the emergency fire
water pump directly. Confirm actuation results in water flow
from appropriate pumps (Tag Proc. ME224-01)
Test generator cooling pump # 2 cross over valves to
supply the emergency fire water pump directly. Confirm
actuation results in water flow from appropriate pumps
(Tag Proc. ME224-01)
FUNCTION 2: To supply firewater at the required pressure and flow rates for end users.
1. General service pumps maintain ring main
pressure at 7 bar and can deliver water at a
rate of 100 tonnes per hour @ 64m head.
Fall in ring main pressure alarms in Control
Room between 4.5 – 4.8 bar.
Design Basis Test ring main pressure sensor and alarm at the Control
Room (Tag Proc. ME813-09)
2. The general service pump provides firewater
to ring main at a rate of 100 tonnes per hour
@ 64m head. It can deliver at least one jet
simultaneously from each of any two fire
hydrants, hoses and 19 mm nozzles while
maintaining a minimum pressure of 3.5 bar
at any hydrant.
Design Basis
DNV Rules
Verify general supply pump pressure at hydrant during
function test. Confirm via pressure gauge on pump
discharge (Tag Proc. ME813-09)
3. The emergency fire pump provides firewater
to the ring main at a rate of 130 tonnes per
hour @ 120m head. It can deliver at least
one jet simultaneously from each of any two
fire hydrants, hoses and 19 mm nozzles
while maintaining a minimum pressure of 3.5
bar at any hydrant.
Design Basis Verify fire pump pressure at hydrant during function test.
Confirm via pressure gauge on pump discharge (Tag Proc.
ME813-09)
4. The emergency fire pump provides
automatic, remote and manual start ability to
ensure fire water is supplied to the rig main
for firewater users
Design Basis Function Test emergency fire pump for local start, remote
start and automatic start on ring main low pressure (Tag
Proc. ME224-01)
5. The fire pump provides firewater to the ring
main at a rate of 100 tonnes per hour @ 64m
head. It can deliver at least one jet
simultaneously from each of any two fire
hydrants, hoses and 19 mm nozzles while
maintaining a minimum pressure of 3.5 bar
at any hydrant.
Design Basis Verify fire pump pressure at hydrant during function test.
Confirm via pressure gauge on pump discharge (Tag Proc.
ME813-09)
8/12/2019 Drillsafe 09-10 Stena Green Performance Stds
http://slidepdf.com/reader/full/drillsafe-09-10-stena-green-performance-stds 15/24
Performance Standard VerificationBefore:
• Focused on class requirements, no proper linkagewith the Safety Case and the role of critical
equipment in managing major hazards
After:
• Third party verification activities focused around theimproved performance standards
• Much higher level of rigour and confidence in the
scheme• Three tiers: Review, Visual Examination, Function
Test, allows verification party to focus on areas
where deficiencies identified
8/12/2019 Drillsafe 09-10 Stena Green Performance Stds
http://slidepdf.com/reader/full/drillsafe-09-10-stena-green-performance-stds 16/24
Performance Standard Verification -
AfterTit le ACTIVE FIRE PROTECTION Reference SCE-09
Extent All components compr isi ng the system Revision 1
TaskRef.
Task Details Frequency PerformanceCriteria Ref.
PSCompliance
Notes
Type details of each task to be done in a separate cell months # Yes No
1 VISUAL EXAMINATION
1.1 Visual external examination of General Service Pumps 12
1.2 Visual external examination of General Service Pumps 60
1.3 Visual external examination of Emergency Fire water pump 12
1.4 Visual internal examination of Emergency Fire Water Pump 60
1.5 Visual external examination of deluge pump 12
1.6 Visual internal examination of deluge pump 60
1.7 Confirm pressure is maintained in ring main under normal conditions 12
1.8 Confirm GS pumps status is indicated in Control Room 12
1.9 Confirm emergency fire pump status is indicated in Control Room 12
1.10 Confirm deluge pump status is indicated in Control Room 12
1.12 Verify level in 3% AFFF Foam tank to ensure availability 12
1.13 Verify location and visually inspect hydrant equipment, foam eductors andextinguishers against Safety Plan
12
1.14 Visual examination of CO2 Room and ensure it is located outside protectedarea
12
1.15 Visual examination of CO2 bottles and release stations (confirm no debrisor paint impairing release mechanism on bottles)
12
8/12/2019 Drillsafe 09-10 Stena Green Performance Stds
http://slidepdf.com/reader/full/drillsafe-09-10-stena-green-performance-stds 17/24
Performance Standard Verification -
After
2 FUNCTION TEST
2.1 Confirm GS pumps, emergency fire pump and deluge pump can be startedlocally / remotely on main and emergency power as appropriate
12
2.2 Confirm firewater tank low level alarms in Control Room 12
2.3 Confirm emergency fire pump starts upon loss of ring main pressure 12
2.4 Confirm isolation valves on ring main are tested and operational 12
2.5 Test helideck foam monitors and ensure sufficient pressure and flowcapacity of foam
12
2.6 Test concentration AFFF and water in foam monitors 12
2.7 Test deluge systems for adequate initiation and coverage, includingcondition of nozzles.
12
2.8 Test well test area monitors to ensure sufficient pressure and flow capacityof fire water
12
2.9 Test hydrant equipment while under pressure 12
2.10 Function test of release station for audible / visual alarms, HVAC shutdownin appropriate area for CO2 system
12
3 REVIEW
3.1 Review PM records to ensure that maintenance levels are acceptable. 12
3.2 Review relief valve certificates for ring main 12
3.3 Review portable and trolley mounted extinguisher service records 12
3.4 Review service reports for CO2 system 12
3.5 Review pressure test reports for CO2 system 12
8/12/2019 Drillsafe 09-10 Stena Green Performance Stds
http://slidepdf.com/reader/full/drillsafe-09-10-stena-green-performance-stds 18/24
Codes and Standards
• Have evolved to take account of learning fromhistory, including past events
• With older rigs, we can often make a risk
based argument not to do things• Don’t loose sight of inherent safety
• Work to making things simple/ less
complicated.
• Work to the new codes & standards/ best
practices
8/12/2019 Drillsafe 09-10 Stena Green Performance Stds
http://slidepdf.com/reader/full/drillsafe-09-10-stena-green-performance-stds 19/24
8/12/2019 Drillsafe 09-10 Stena Green Performance Stds
http://slidepdf.com/reader/full/drillsafe-09-10-stena-green-performance-stds 20/24
Other Improvements Implemented
• Emergency Fire pump – starts automatically when fire main
pressure drops – can also be started manually. Previously
several steps had to be taken to provide fire main pressure
(see previous slide)• Emergency Ballast pumps installed – This allows the rig to
recover from an angle of 15⁰ by the head
• Emergency Anchor Release – Remote release fitted to
Temporary Refuge EEC, controlled release during black out• Gas detection system up graded – Controls installed in
Temporary Refuge EEC
8/12/2019 Drillsafe 09-10 Stena Green Performance Stds
http://slidepdf.com/reader/full/drillsafe-09-10-stena-green-performance-stds 21/24
Other Improvements Implemented
Annual major hazard review:
• Formal review focused on major hazard management aspects
• Covers safety management systems and equipment
•Some specific areas for focus
– Change, including cumulative effects
– Emergency preparedness
– Management of safety critical elements
– Operational limits and boundaries
– Accident and incident trends
• To help – in the process of developing formal management
system performance standards
8/12/2019 Drillsafe 09-10 Stena Green Performance Stds
http://slidepdf.com/reader/full/drillsafe-09-10-stena-green-performance-stds 22/24
8/12/2019 Drillsafe 09-10 Stena Green Performance Stds
http://slidepdf.com/reader/full/drillsafe-09-10-stena-green-performance-stds 23/24
SMS Performance
Standards
Lead and lagindicators
Central Activities Leadership
Behaviour
Transferable Activities Competency and Training
Supervision
Communication
Work Activities Hazard Identification and Risk Assessment
Management of Third Parties
Management of Change
Permit to Work (and Isolation)
Maintenance
Marine Operations
Drilling Operations
Emergency Response
Improvement Activities Performance Monitoring and Improvement
Safety Critical Activity Performance Standard Layout
Performance Standard: Reference # Safety Critical Activity Name
Performance Objective: Describes the overall hazard management role of the safety critical element.
May be broken down into sub-elements depending upon complexity
Key Procedure and Tasks: Describes the components and limits of the safety critical activity. Includes
what key procedures and tasks are included, and where the interfaces or beginning and end points exist
Desired Safety Outcomes: Key
safety outcomes that demonstrate
the activity is being conducted /
implemented effectively
Assurance: Activities or tasks undertaken to ensure that the
safety critical activity delvers the desired safety outcomes
Leading Indicator: A measures of
process or inputs essential to
deliver the desired safety outcome
Lagging Indicator: A measure of
when a desired safety outcome has
not been achieved.
Criteria: The
criteria used to
measure whether
the desired safety
outcome is being
achieved
satisfactorily or not
Monitoring /
Reporting: How the
indicator is
monitored and
reported
Frequency: How
often the indicator is
monitored and
reported
G Y R
8/12/2019 Drillsafe 09-10 Stena Green Performance Stds
http://slidepdf.com/reader/full/drillsafe-09-10-stena-green-performance-stds 24/24