Page 17 - igem-g-4 edition 2

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IGEM/G/4 Edition 2
dry bore
Any drilling system not employing drilling fluid in the process.

dry gasholder
Low pressure gasholder in which the annular space between the moving piston and gasholder
side wall is completely sealed by a specifically-designed fabric seal.

dry run
Verification of the correct operation of components and interlocks without fuel being available
to a combustion space.

dual-fuel engine
An engine of the spark or compression ignition type, that is capable of operating on two or
more fuels.

dual-fuel turbine
Turbine which is equipped to enable it to operate on two or more alternative fuels.

duct
Encasement installed to protect a building service or to facilitate its passage through or under
a structure.

dumpling, relating to a watersealed gasholder
Unexcavated area in the middle of a below-ground tank.

dwelling, relating to multi-occupancy buildings
Individual residential premises within a larger building.

earth piercing
Use of a tool which comprises a percussive hammer within a suitable casing, generally torpedo
shaped.

easement/servitude
Legal instrument that conveys a right of way over another’s ground or property.

ejector
Device that injects high pressure fluid through a jet to induce suction for the removal of
another fluid.

elastic follow up
Refers to elastic displacement being sufficiently large that the stresses appear to be load-
controlled even though distortion has occurred.

elastomeric
Generic term for materials such as synthetic or natural rubber.

electrical equipment
One or more electrical component assembled for a specific purpose.

electrofusion
Method of jointing PE pipe, using fittings having integral electrical heating coils.

emergency block valve
Valve, complete with open and closed limit switches, which closes automatically in response to
an external signal.

emergency call centre
Designated location for receipt of telephone calls etc. relating to reported gas escapes.

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