2.2 Fire and Gas Flashcards
(45 cards)
1
Q
What are Fire and Gas Detection Systems?
A
- Essential equipment in maintaining a safe working environment on a drilling unit
- Located in 24-hour manned areas for rapid response
- Self diagnostic - detectors will alarm if there is a circuit loop or zone fault
2
Q
Fire Detection (General)
A
- Expensive with +/- 800 various types of detectors and manual call points on a modern semi-submersible drilling unit
- Detectors grouped into circuits known as loops or zones
- In case of an alarm only the individual detector or manual call point is displayed
3
Q
Fire Detection - Fire Detection Panel
A
- Located in a 24-hour manned room
- Panel is self diagnostic
- In the event of a detector fault or open circuit an alarm is activated on the panel
- Local alarm on the panel si timed to approximately 2 minutes
- Failure by personnel to repond results in a rig-wide alarm
- Modern rigs have fire and gas systems integrated in vessle management system and can be monitored on computers at several locations on the unit
4
Q
Fire Detection - Smoke Detectors
A
5
Q
Fire Detection - Heat Detectors
A
6
Q
Fire Detection - Flame Detectors
A
7
Q
Fire Detection - Manual Call Points
A
8
Q
Gas Detection (General)
A
- Modern rigs have integrated fire and gas systems into their vessel management system
- Fire and Gas System is divided into several views
- Fire Areas
- Groups of Fire Areas (typical one deck or a process areas)
- System Status
- Fire Fighting System
- The Fire and Gas Main screen shows the entire installation divided into groups of fire areas
- C&E view = Cause and effect
9
Q
Gas Detection - Gas Detection Panel
A
- Located in 24-hour manned room
- Similar to fire detection panel, gas detecion panel is self-diagnostic
- Alarm activated on panel if there is detector fault or system open circuit
- Local alarm on panel is timed to approximatey 2 minutes, failure by personnel to respond will result in a rig-wide alarm
10
Q
Gas Detection - Hydrocarbon and H2S Gas Detectors
A
11
Q
Gas Detectors - Hydrocarbon Gas Detection
A
12
Q
Gas Detectors - H2S Gas Detection
A
13
Q
Gas Detectors - Personal gas Detection
A
14
Q
Gas Detection - Third Party Gas Detection
A
15
Q
Fixed Firefighting Systems - Alarm Systems
A
- Different alarm systems used in the galley area in accommodation:
- CO2 alarm system
- Break glass for galley duct system
- Wet chemical system alarm
- Gas alarm system
16
Q
Fixed Firefighting Systems - Methods and Equipment
A
- Fixed firefighting systems should be installed in areas representing a major fire risk
- And should cover equipment containing a significant amount of hydrocarbons such as main engine rooms and machinery spaces
17
Q
Fixed Firefighting Systems
A
18
Q
Fixed Fire Fighting Systems
A
19
Q
Helideck Firefighting
A
- Helideck on an offshore drilling unit equipped with water/foam fire fighting monitors when activated they cover teh complete Helideck
- There is also a CO2 bottle for fire protection during helicopter start ups
- There are also Deck Integrated Fire Fighting Systems (DIFFS)
20
Q
Ventilation System Fire Dampener
A
- In the event of a fire in an area, it is standard procedure for the fans in that area to shut down automatically
- This action would also close the ventilation dampeners in that area and further isolate the fire from spreading
- Automatically controlled dampeners operate in fail safe mode where loss of power will close the dampener
21
Q
Emergency Shut Downs
A
- Emergency Shut Downs (ESD) in their early basic form were methods for the driller to shut down the Silicon Controlled Rectifier (SCR) drive system and the engines in the event of an emergency
- As technology has become more advanced, in an emergency it is essential to shut down certain areas of the rig or specific equipment but not the entire unit as a whole
- Some units have ESD push buttons to cover various functions such as: Generators and ventilation fans shut downs, quarters ventilation shut down, emergency generator, third party equipment shut down, fuel pumps and welding machines
22
Q
Fire Stations (General)
A
23
Q
Fire Stations - Fire Hose Stations
A
24
Q
Fire Stations - Fire Equipment Stations
A
25
Fire Extinguisher (General)
26
Fire Extinguisher - Classes
27
Fire Extinguisher - Color Codes
28
Fire Extinguisher - Classes and Suitability
29
Fire Extinguishers - API Recommended Practices
30
Fire Pumps
* Fire pumps are a part of a fire sprinkler system
* Taken from IMO MODU CODE 2009 para 9.7.5
* Each fire pump should be capable of:
- Delivering at least one jet simultaneously from each of any two fire hydrants, hoses and 19mm nozzles
- While maintaining a min pressure of 0.35 N/mm2 at any hydrant
* Where a foam system is provided for protection of the helicopter deck the pump should be capable of maintaining a pressure of 0.7 N/mm2 at the foam installation
* N/mm2 to bar
- Where 0.35 N/mm2 = 3.5 bar
- Where 0.7 N/mm2 = 7 bar
* The main fire pumps do not kick in until the pressure drops below a set amount
* To keep the fire main normally pressurised a small pump called a jockey pump is used
31
Fire Alarms
* Fire and Gas alarm bells and horns must have an alarm that is loud enough to be heard across a large area
* Flashing lights are used to inform personnel of an alarm in noisy areas
* Fire and Gas also feed into the (PAGA) system which public adress and gas alarm system which gives an automatic alarm activation
32
Inspection - Smoke Detection
33
Inspection - Heat Detection
34
Inspection - Flame Detection
35
Inspection - Manual Call Points
36
Inspection - Fire Detection Testing
37
Inspection - Gas Detection Testing
38
Inspection - Main Fire and Gas Panel Inspections
39
Inspection - Dampeners
40
Inspection - Fire and Hose Stations
41
Inspection - Fire Pumps
42
Inspection - Fire Extnguishers
43
Common Faults (General)
44
Common Faults - Extinguishers
45
Common Faults - Common Problems
