Page 542 - Offshore Electrical Engineering Manual

Index 529

hazard source schedules, 316, 317f Hot dipped galvanised steel, 296
ignition avoidance by non-electrical Hot temperature, 30
equipment, 315 ‘Hot work’ permits, 347
ignition avoidance by radio and radar Hot-spot temperatures, 26–27
transmissions, 315–316 Housing of vented batteries, ventilation and, 116
increased safety EX ‘e’ equipment, 306 HRC cartridge fuses, 71, 72f
installation, 303 HSE. See Health and Safety Executive (HSE)
applications, 303 Hull structure, 341
intrinsic safety, 309 HV. See High-voltage (HV)
level of protection ‘ia’, 310 HVAC systems. See Heating, ventilation and
level of protection ‘ib’, 310 air-conditioning systems (HVAC systems)
level of protection ‘ic’, 310, 311f–312f Hydrates, 460–462
logic of area classification, 319 Hydraulic ratchet pump, 60
loop calculations for galvanic barriers, Hydrocarbon hazards, 15–18
313–314, 314f emergency shutdown system, 17
mixing hazardous area certified equipment fire and gas monitoring, 16–17
equipment for polar regions, 324 safe and hazardous area ventilation, 17–18
global and national standards, 319–324
intrinsically safe barriers, 324 I
motors selection for hazardous areas, 319 I/O module. See Small input/output module (I/O
non-sparking equipment, 308 module)
pressurised equipment, 308 IAS. See Integrated automation system
selection of other equipment, 315 (IAS)
simple apparatus and components, 312–313 ICB. See Independent Competent Body (ICB)
temperature considerations ICP. See Independent Competent Person (ICP)
flashpoint temperature, 304 IDMT. See Inverse definite minimum
ignition temperature, 304, 304t time (IDMT)
terminals, 307 IEC 60909, 239–240
ventilation, 316–318 IEEE141/ANSI37, 240
Hazardous zone, 161 IEC 61363, 239
HAZOP study. See Hazard and Operability study individual phase fault current, 242f
(HAZOP study) IEC STANDARD 61363–1, 239
Heading control, 336 IEE Wiring Regulations. See Institution of
Health and Safety Executive (HSE), 168 Electrical Engineers Wiring Regulations
Heat balance values, 59t (IEE Wiring Regulations)
Heat run IEEE141/ANSI37, 240
AVR readjustment during, 32 IGBTs. See Insulated gate bipolar transistors
at full power, 349 (IGBTs)
Heating, ventilation and air-conditioning systems Ignition
(HVAC systems), 17–18 avoidance
Heavy duty by non-electrical equipment, 315
admiralty pattern, 285 by radio and radar transmissions, 315–316
reverse flange, 285 temperature, 304, 304t
Heavy lifting, 339 Illuminance, 146
Helicopters communication, 178 at point, 156–158, 157f
Helidecks, 161–162 Imbedded squirrel-cage damping windings, 125
High-voltage (HV), 289, 290f. See also Low IMO, 327, 328t–329t
voltages (LVs); Medium-voltage (MV) Impressed current
DC tests, 377, 378t cathodic protection, 139–140
switchboard, 289 circuits, 142
test unit, 350 on submerged pipelines, 141
Hook-up diagram, 194, 197f systems, 140–141, 141t
Hoop stresses, 103 Independent Competent Body (ICB), 416