Emergency Controls

Those controls that stop power to machine or components.

Emergency Recovery Shaft

See Rescue ShaftAn unplanned additional shaft required to remove obstacles/obstructions and/or retrieve or repair the MTBM. The rescue shaft may need to function as a jacking shaft to complete the drive..

Emergency Repair

A repair that must be made while the main is pressurized, or flowing.

Emergency Stop

A red manually operated push button that, when activated, stops all functions of the machine.

Encrustation

Used to describe deposits left by the partial evaporation of infiltrating groundwater containing dissolved salts. CanA principal module that is part of a shield machine such as an MTBM or tunnel boring machine (TBMs); its use depends on the installation dimensions required and the presence of an articulated joint to facilitate steering. The can may also be referred to as a trailing tube. be classified into light, medium or heavy by percentage loss of cross-sectional area.