We have 20 entries in our Glossary for this letter.
Highway Addresable Remote Transducer
Open protocol that supports two way digital communications for process measurement and control devices.
A widely used nickel-molybdenum-chromium alloy.
Offers excellent resistance to wet chlorine, hypochlorite bleach, ferric chloride and nitric acid.
Hand Arm Vibration Syndrome
A potentially debilitating disorder resulting from prolonged exposure to vibration - specifically to the hands and forearms while using vibrating tools.
Hazid - Hazard Identification
The process of identifying credible hazards for a Quantified Risk Assessment (QRA)
Hazard and Operability Review
HAZOP Toolbox Page
A chemical compound that consists only of hydrogen (H) and carbon (C).
Heating Value is defined as the amount of energy released when a fuel is burned completely in a steady-flow process and the products are returned to the state of the reactants.
The heating value is dependent on the phase of water/steam in the combustion products. If H2O is in liquid form the heating value is called HHV (Higher Heating Value).
High Integrity Protective System - or sometimes High Integrity Protection System
An automatic safety system with a SIL level of 3 or more
SIL Ratings Toolbox Page
Helicopter Landing Officer
Heavy Lift Vessel
HMI - Human Machine Interface
A dated term superseded by SCADA
This includes welding or the use of any flame or electric arc or the use of any equipment likely to cause heat or flame or spark.
HP - High Pressure
Often used with reference to a utility or vent line e.g. HP air supply
Hydraulic Power Unit
Hydraulic Cleanliness Toolbox Page
Health Safety and Environment
HSE - Health and Safety Executive
Authority responsible for the regulation of almost all the risks to health and safety arising from work activity in Britain.
Helicopter Underwater Escape Training
Part of the Basic Offshore Induction and Emergency Training course where participants swim from an inverted helicopter submerged in a swimming pool.
Guide to Offshore Survival Course
Heating Ventilating and Air Conditioning
A pressure test of piping; pressure vessels or pressure-containing parts; usually performed by pressurising the internal volume with water.
HYprotech SYStems process modeling software by AspenTech
Used for steady state simulation; design; performance monitoring; optimization and business planning for oil & gas production; gas processing and petroleum refining industries.
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