Chapter 1
Turbine Package System Overview
1-28
Acoustic Lagging
To meet site noise emission requirements, the intake system may be acoustically lagged up to
and including the air intake silencer. As a minimum, the lagging will have sufficient physical
properties to meet the package noise level requirements.
Instrumentation
The air intake filter pressure drop is monitored by a differential pressure transmitter (PDT1)
which gives warning and shutdown signals to the unit control panel.
Exhaust System
Exhaust Silencer
An exhaust silencer reduces noise emissions from the turbine exhaust.
Acoustic and Thermal Lagging
To meet site requirements, the exhaust system may be acoustically and thermally lagged
downstream of the acoustic enclosure, up to the silencer or waste heat recovery unit (where
applicable) excluding flexible joints. As a minimum, the lagging is sufficient to ensure the outer
surface of the cladding is restricted to 55ºC for metallic cladding or 65ºC for non-metallic
cladding. This will ensure:
•
Heat is kept within the duct for overall system efficiency.
•
Acoustic attenuation.
•
Protection of personnel.
Instrumentation
A pressure differential transmitter (PDT133) situated in the exhaust duct provides indication of
exhaust gas backpressure (if applicable).
