Page 546 - Offshore Electrical Engineering Manual

Index 533

Multiple ICPS/interface with other O
ICPs, 428–429 Ocean-going vessels, 28
Muster Office
points, 177 environment and procedures, 184–185
station communications, 113 procedures, 185
MV platform scheme, relay setting of, 251–252 working environment, 184
N Offloading facility, 335
Offshore, 202
Nacelles, 294 accommodation, 81
National Fire Protection Association design, 183
(NFPA), 130 distribution transformers, 82, 173, 211–212
National standards for hazardous area installation, electric motor ratings, 121
319–324 electrical supply system, 4
NATO fleet, 102 low-voltage switchgear and MCCs for
Natural gas, 54 offshore use, 107–108
Naturally occurring radioactive materials platform, 68–69
(NORM), 460 production installations, 43
Navigational lighting, 162–163 regulatory regime, 165
Nearby offshore installations, 113 renewable energy substation platforms
Negative phase sequence protection, 209 hazards, 344
Network sacrificial cathodic protection
communication interface unit with input anodes, 344
points, 108 wind farm, 343
linking device, 108 switchboards, 75
scanner module, 108 transformers, 211–212
Network Protection and Automation Guide Offshore electrical dimension
(NPAG), 231 description of typical system, 5–11
Neutral Earthing, 62–63, 63f–64f, 207 drilling supplies, 9–11
NFPA. See National Fire Protection Association emergency or basic services switchboard, 8
(NFPA) fire pumps, 8
Nickel–cadmium cells, 115–116 key services or submain generators, 5
Nodal low-voltage distribution, 7–8
constraints, 230 main prime movers, 5
voltage analysis, 229 medium-voltage distribution, 5–7
Noise secure alternating current and direct current
control, 300 power supplies, 9
test, 349 electrical system design criteria, 4–5
Non-electrical equipment, ignition avoidance by, hazards offshore, 4
315 marine environment, 3
Non-IS circuits, 99 single-line diagram
Non-sparking equipment, 308 of typical drilling electrical
Nonintelligent units, 108 system, 10f
Nonsinusoidal waveforms, 117 of typical offshore electrical system, 6f
Normal lighting, 159 Offshore electrical environment
Normally unmanned installation, 43 distribution configuration, 18–21, 19f
North Sea oil and gas installations, 167 environment, 14
Not-usually-manned installations (NUIs), 180 hydrocarbon hazards, 15–18
NPAG. See Network Protection and Automation isolated situation, 13–14
Guide (NPAG) modular construction, 21
Nuclear reactor or similar complex system, 17 safety, 13
NUIs. See Not-usually-manned installations (NUIs) subsea cable vs. on-board generation, 21–22
Number, load profiles, 57 water hazards, 15
Nylon 12 ties, 95