Biochemical oxygen demand (also known as BOD or biological oxygen demand) is an analytical parameter representing the amount of dissolved oxygen (DO).

A wall that is designed to retain its integrity against a defined blast loading and fire that may subsequently follow.

A valve that has one seat which provides a seal, and a bleeder line and valve that are tapped into the block valve's bonnet.

A physical object intended to compress and supply air or gas at medium pressure and medium volume flow.

An indirect contact heat exchanger that is intended to heat a liquid.

A physical object intended to arrest or prevent the motion of an item. Typically by means of friction.

A device for actuating an alarm system that required a person to break the glass cover.

A respirator in which air or oxygen is fed to a face mask carried by the wearer via a demand valve.

Is a support structure intended to span a space.

A device to permit relative movement between a bridge and its support generally requiring periodic inspection and maintenance

A structure to control the formation of lateral buckles along a pipeline or flowline.

An engineering dampening device to provide a controlled end stop for vehicles , trolleys or cranes and associated equipment in motion.

In telecommunications, a distribution frame is a passive device which terminates cables, allowing arbitrary interconnections to be made.

A constructed retaining wall around storage where potentially polluting substances are handled, processed or stored, for the purposes of containing any unintended escape of material from that area until such time as remedial action can be taken.

A physical object that is an assembly of busbar, bus duct enclosure, busbar insulation mounts etc.

An electrical conductor that is of low-impedance, to which several electric circuits can be connected at separate points.

A butterfly valve that is equipped with an actuator that manipulates a stream of fluid in the response to a signal from an external sensing element and with input of energy from an external source.

A rotary valve that has a closure member of a disc type with a shaft parallel, or near parallel, to the plane of the disc, with an axis of rotation transverse to the flow direction.

Is an enclosure intended to hold and protect electrical components.

A physical object that is a reel on to which cable is wound during manufacture, for storage, transportation and installation.

A unit or assembly of units or sections and associated fittings forming a rigid structural system used to securely fasten or support cables and raceways.

A protective device used to protect equipment (e.g. riser pipes and submerged pumps) against environmental exposure.

Intended to measure quantities of absorbed or evolved heat or to determine specific heats.