A distribution transformer or service transformer is a transformer that provides the final voltage transformation in the electric power distribution system, stepping down the voltage used in the distribution lines to the level used by the customer.

A system where heat is distributed to residential or commercial properties from a central location.

Any change inside or outside a control system which disturbs the equilibrum.

A person who dives, especially one who works under water using a diving-suit.

A compartment within an underwater system or vehicle provided with internally pressurizing capability to transfer a diver to the work site from the submersible and back.

A type of blowout preventer used on an oil rig to divert fluid safely from well under “kick” or rapid pressure rise condition.

The offshore industry is heavily dependant on diving operations. Air diving is used for the inspection and repair programmes carried out in shallow waters.

A manned, non-self-propelled submersible tethered unit consisting of at least one chamber internally pressurized in order to allow a diver to be transported to and from an underwater site.

A vessel provided with diving equipment and used for underwater work such as the maintenance and inspection of mobile platforms, pipelines and their connections, well-heads, etc.

According to Holland Shipbuilding June 2009 The SEVEN ATLANTIC, delivered by IHC Merwede in 2009 to Subsea 7, is one of the largest and most capable diving support vessels in the world.

Compressed air or gas mixture saturation system for the conduct of diving operations. Surface compression chamber, diving bell, handling system and fixed gas storage facilities are main components of a saturation diving system.

1. A place where a ship can be moored. A wet dock is a port area isolated from tidal water movements by a lock gate.

Acceptance tests performed on ship equipment and systems, in the presence of an Owner’s supervisor and/or a class surveyor to demonstrate suitable performance.

A plan used by the head of a dry dock to determine the blocking required for a vessel prior to entering the dock.

Double bottom tanks are provided with plugs to allow draining prior to examination in a dry dock. Plugs of water tanks shall differ from plugs for oil tanks.

Stresses occurring in a ship structure when it is not supported by water, e.g. in a dry or floating dock.

DOCKWISE VANGUARD is a semi-submersible vessel for heavy transport and offshore dry-docking built by Hyundai Heavy Industries in Ulsan for the Dutch shipping company Dockwise.

Domestic energy consumption is the total amount of energy used in a house for household work.

Domestic energy poverty refers to a situation where a household does not have access or cannot afford to have the basic energy or energy services to achieve day to day living requirements.

Water that may be used for drinking or cooking.