L
LAC IHO Legal Advisory Committee www.webpage
LACT Lease Automatic Custody Transfer (automatic transfer of ownership of crude oil) 
LADS Laser Airborne Depth Sounder 
LAH Lithium Aluminium Hybride
  Level Alarm High
LAHH Level Alarm High High
LAL Lock and Load
  Level Alarm Low 
LALL Level Alarm Low Low
LAN Local Area Network
LAPIO Low API Oil (=high specific gravity oil)
LARS Launch And Recovery System
LASA Latin American Shipowners' Association
LASER Light Amplification by Stimulated Emission of Radiation
LAT Lower Astronomic Tide
LB Lateral Buckling
LBL  Long Base Line (acoustic positioning system)
LC  Locked closed
LCC  Life Cycle Cost 
LCLO  Lowest Lethal Concentration
LCT  Landing Craft
LCV Level Control Valve
LCx Lethal Concentration
LD Liquidated Damage
LDC Distribution Company
LDHI Low-Dosage Hydrate Inhibitor
LDPE Low Density PolyEthylene
LED Level of Exit Discharge
  Light-Emitting Diode
LEEA Lifting Equipment Engineers Association
LEL Lower Explosive Limit
LEMMA  Laboratoire d'Etudes des Matériaux en Milieu Agressif (French meaning) 
LEMP  Lightening Electro Magnetic Protection
LES   Land Earth Station (Inmarsat term) 
LFL Lower Flammabiliy Limit
LFO Light Fuel Oil 
LFR  Liquid Flow Rate
LG Liquid Gas
  Level Gauge 
LHV Low Heating Value
LICS  Light Intervention Control System
LIM Line Insulation Monitoring
LIR Local Instrument Room
LJ  Lap Joint
LL  Leased Line (telecommunications)
LLI  Long Lead Item
  Low Level Indicator 
LSLL  Level Switch Low Low
LMRP Local Medical Review Policy  
LMTD Log Mean Temperature Differential
LNG Liquefied Natural Gas 
LOA Over All Length (of a boat)
LOAEL Lowest Observed Adverse Effect Level
LOF  Lack Of Fusion
  Lloyd's Open Form
LoFS Life of Field Seismic
LOICZ Land-Ocean Interactions in the Coastal Zone (The Netherlands) www.website
LOLP Loss Of Load Probability
LOP  Line Of Position (ship)
LOPA  Layer Of Protection Analysis 
LORAN Long Range Navigation
LOS Law of the Sea
Line Of Sight
LOTO  Log Out, Tag Out 
LP Low Pressure 
LPC Linear Predictive Coding 
LPE Layer PolyEthylene
LPG  Liquefied Petroleum Gas
LPI Liquid Penetrant Inspection 
LPP Layer Polypropylene
LPR  Linear Polarisation Resistance probe
LPS Lightening Protection System 
LPT Low Pressure Train 
LPZ  Lightening Protection Zone
LQ's Living Quarters
LR  Local Regulations
  Lloyds Register www.website
LRAD  Long Range Accoustic Device 
LRFD Load and Resistance Factor Design 
LRIT  Long Range Identification & Tracking
LRP Lower Riser Package
LS Low Strength
LSA Low Specific Activity
  Life Saving Appliance (IMCA) 
LSFO Low-Sulfur Fuel Oil
LSH Level Switch Low  (automation)
LSHH  Level Switch High-High (automation)
LSL  Level Switch Low  (automation)
LSLL Level Switch Low Low (automation)
LSPM Light Source Power Meter
LSS Life Support Supervisor
LST Life Support Technician (for diving chambers)
LSTK  Lump Sum Turn Key (contract or package) 
LTCS Low Temperature Carbon Steel 
LTD  Low temperature Detector 
LTE  Let Through Energy 
LTI   Lost Time Injury / Incident
LTIF Lost Time Injury Frequency(LTI per 1 million man hours worked)
LTOBM Low Toxicity Oil Base Mud
LUSBL Combined LBL and USBL acoustic positioning system 
LV Low Voltage ( = french BTA for Basse Tension A) i.e. 50<U<=500 AC or 120<U<=750 DC
  Lubricator Valve
LVDT Linear Variable Digital Transducer
LWD Logging While Drilling
LWL Length at the Waterline (ship hull)