Turbine Package Operators Manual
Chapter 1
Turbine Package System Overview
1-27
Combustion Air System
Air Inlet Filter - Marine Type (if applicable)
The combustion air intake filter (XF34) is of the high velocity, high efficiency multi-stage type
consisting of five stages.
The first stage of the filter consists of a weather hood and bird screen.
The second stage consists of a spin tube module and extractor assembly. The spin tube module
consists of a bank of spin tubes mounted in a frame. Air entering the inlet tube strikes a fixed
spinner that imparts a whirl effect, which develops a high radial velocity to the air stream. The
inertial action forces heavy contaminants in the airflow to the periphery of the tube, separating
them from the airflow. Purified air exits through a central discharge tube whilst contaminants are
carried by the secondary discharge stream into a bleed duct system. The bleed duct system
comprises a small transition section that leads to a short case axial flow fan. The fan pulls the
contaminant-laden air through the bleed duct to the outside of the filtration system.
The main filter section is a high efficiency bag type filter with an optional pre–filter bag fitted
directly in front of the main filter bags to prolong their life by removing heavy contamination.
The final stage consists of a vane separator for the inertial interception and removal of bulk
water caused by high humidity, rainfall or sea spray.
The filter housing is provided with a side or front access door for servicing of filter elements and
gas detectors (when fitted).
Where anti-icing is required a heat exchanger is mounted onto the front of the filter and provided
with hot exhaust gases ducted from the exhaust system.
For further information, refer to the Maintenance Manual.
Air Intake Filter - Pulse Type (if applicable)
The combustion air intake filter (XF34) is of the high efficiency, single stage, pulse clean type.
The filter comprises of a matrix of cylindrical filter elements, which are cleaned by means of a
reversed pulse of compressed air.
Pulsing occurs automatically when a preset pressure differential is reached; it can also be
initiated manually or via a timer to over-ride the differential pressure control signal. An additional
timer is included to over-ride the control system to inhibit the pulse at preset times e.g. late at
night.
Compressed air headers and blow tubes deliver a solenoid valve (SOL361) controlled pulse of air
that clears dust cake and any ice build up from the outside surface of the elements.
A pulse clean scavenge fan XM19 is fitted to assist removal of debris from the filter (if applicable
to this application).
For further information, refer to the vendor documentation in Volume V – Vendor Information
Manual.
Air Intake Silencer
A silencer is provided to reduce noise emissions from the turbine intake.
