Table 3.1.1: Guidelines for Fusible Plug Installation according to EN ISO 10418.
UV/IR Flame Detectors and Heat Detectors (fusible plug networks or linear heat detectors as specified below) will be used for early fire detection in open deck areas on the following equipment:
• Wellheads (fusible plug network);
• Process area (linear heat detector);
• Corrosion Inhibitor Skid (linear heat detector);
• Methanol System (linear heat detector);
• Shut-Down valve actuators on the flowline (linear heat detector);
• HIPPS (linear heat detector);
• Diesel Fuel System (linear heat detector);
• Launching Trap (future installation) (linear heat detector).
Smoke and Flame Detectors are installed in enclosed areas such as:
• Electrical Technical Room;
• Emergency Electrical and Instrument Control Room;
• Battery Room;
• Crane Control Cabin;
• Survival Module and Fresh Water System Room (if indoor).
Each main and emergency power generator shelter is equipped with dedicated Smoke and Flame Detectors.
Detectors have also been installed in ceiling and floor voids, where these contain potential sources of fire. Flame Detectors are installed also next to the Helideck to automatically activate Firefighting System.
Thermocouples have been installed at HP and LP Vents Tips (2oo3 voting logic) to detect fire in case of accidental ignition of discharged gas and automatic activation of CO2 Snuffing System.
In addition to Fire Detection Devices, local Manual Fire Alarm call points (MFA) have been strategically located on the Platform, so that personnel on board can raise the alarm if a hazardous situation is detected.
These stations consist of a latched button protected by a specific cover. Once operated, the station remains in alarm position until manual reset occurs (i.e. reset with key).
The following table (extracted from standard DNV-OS-D301) gives a guideline for the maximum spacing of Heat and Smoke Detectors: