Page 554 - Offshore Electrical Engineering Manual

Index 541

Variable-frequency Water ingress probability, 8
converters, 273 Water injection, 110, 462
inverters, 89–90 pumps, 131
Variable-frequency drive (VFD), 120 Water separation, 460
Variable-speed drive (VSD), 120, 216–217, 273 Watertight door monitoring, 337
Varnish, 26 Wave height, 3
Ventilation, 316–318 Waveform analysis, 349
and housing of vented batteries, 116 Weather and sea protection, 295–297
systems, 18 glass fibre reinforced plastic, 297
Verification records, retention of, 430 grey cast iron, 296
Verification scheme, 415, 417 hot dipped galvanised steel, 296
Vertical/horizontal coordinate system (V–H manganese bronze and gunmetal, 296
coordinate system), 158 polycarbonate, 296
Very-high-frequency (VHF), 9 stainless steel, 295
Vessel management system (VMS), 330 welded and cast structural steel, 296
Vessels in vicinity, 113 Weight and space limitations of offshore
VFD. See Variable-frequency drive (VFD) installation, 407
V–H coordinate system. See Vertical/horizontal Weight control, 297–299
coordinate system (V–H coordinate system) Weight limitations, 3
VHF. See Very-high-frequency (VHF) Welded steel, 296
Vibration, 299 Welding sockets, 81
analysis, 349 Well completion, 458–459
VMS. See Vessel management system (VMS) Well Examination Scheme (WES), 413, 417
Voltage, 114 Well intervention, 339
balance, 349 Well perforation, 459
characteristics, 85 WES. See Well Examination Scheme (WES)
controlled overcurrent relay, 263 Wind farm, 343
factor, 240 Wind speed and direction, 59
harmonics, 276 Wind turbine installation, 339
levels, 101, 101t, 121, 121t Wind turbine structure, tension leg platform as, 341
ratio test, 361 Winding protection, 208–209
tolerances selection, 114, 114t Wireline logging, 458
total harmonic distortion, 276 Wiring diagrams, 109, 194
voltage-controlled relays, 227–228 Work safety coordination, 349–350
Voltage transformers (VTs), 209, 349, 353, 359–362 Written Scheme, 415, 425f
insulation resistance, 360, 361t Written Scheme of Examination & Test (WSET),
phasing check, 361 287, 417
polarity check, 361, 362f guidance on developing, 423–424
restoration, 362
voltage ratio test, 361 X
Voltmeters, 353 X/R ratios, 240
VSD. See Variable-speed drive (VSD)
VTs. See Voltage transformers (VTs) Z
Zener barriers, 291
W Zinc, 295
Walkways, 163
Water hazards, 15. See also Hydrocarbon hazards