Page 46 - igem-g-4 edition 2
P. 46
IGEM/G/4 Edition 2
tandem control
Arrangement of two pilot operated regulators or two control valves in series and is a derivative
of monitor and active control.
tank, relating to a watersealed gasholder
Vessel holding water which maintains a seal as the lifts rise from and fall into it.
tank balcony (platform)
Walkway around the raised tank of a watersealed gasholder.
technical appraiser
Person who is technically competent in an appropriate professional discipline.
technical handbook
Technical project file for specific plant.
telemetry
Transmission of information and control actions which will allow the operation of equipment
remotely (as opposed to locally).
temperature/pressure sensor
Device that detects a change of physical parameter and generates an electrical signal
corresponding to that change.
temporary operating pressure (TOP)
Maximum pressure at which a system can be operated temporarily under the control of
regulating devices during fault conditions.
temporary vent
Purpose-designed demountable vent stack, which is erected temporarily for the purpose of
venting piping or pipework or plant for maintenance and commissioning operations.
terminal
Device fitted at the flue outlet to allow or assist products of combustion to escape, minimise
down draught and prevent entry of material which might block the flue.
test meter
Meter temporarily installed to measure a defined parameter.
thermal cut off device (TCO)
Valve that automatically closes when the measured temperature reaches a pre-determined
level.
thermowell
Metal pocket protruding into a fluid stream/system to house a temperature measuring device.
third party gas escapes
Escapes of gas from a source other than one for which the gas emergency service provider
(ESP) is responsible.
thrust boring
Method of forming a pilot bore by driving a closed pipe or head from a thrust pit into the soil
which is displaced.
tie-in
Weld to join two sections of pipe or pipework already laid or constructed.
tightness test
Test of piping or pipework for leakage.
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