1.7.2 System Components Description-9HA GT Inlet Air System

2.0 System Component Description

2.1 Filtration

Insect screen : made of steel/steel panels which have to be removed for winter season, avoid mosquitos to reach filtration stages ad to quickly clogged them.

Weather Hoods: Six hoods protect the filter housing intake. Each hood is made of a painted carbonn steel sub structure covered by cladding sheets. Lifting lugs and water draining gutter and pipes are fitted with each hood.

Coalescer Stage: Composed of an arrangement of support holding frames. AISI type 304L, fitted with water draining gutters and pipes. This frames support the 576 coalescer panels made of fiberglass fiber packaged in a plastic frame used for water droplet removal.

Pre Filter and High Efficiency Filter (HEF) Stage: Composed of a V shape support holding frame arrangement, made of AISI 304L. Each horizontal row of holding frames is inclined of 10 degree to evacuate water captured in the filter elements. Gutters and drain pipes enable water draining outside of the filter housing. Holding frame arrangement is designed to support 512 pocket type pre filters and 512 HEF cells. Pre filters are reverse installed against the front face of HEF cells and maintained by a stainless steel wires basket. Pre Filters efficiency class G4 (EN779) are made of synthetic fibers, a plastic header fitted with a gasket for sealing when installed against HEF. HEF efficiency class F9 are of made of fiber glass media, a plastic frame fitted with a gasket for sealing when installed in the support frame.

2.2 Closing Flap

Enable to close and to isolate the inlet air path from the cold ambient conditions during GT stop periods.

2.3 Anti Icing / Heater

Water/Air heat exchanger is used to prevent frost or ice forming on the filtration stages and other stiffeners, silencer baffles are located int he air path during icing events. Exchanger system is also used to heat ambient air, to follow the minimum air temperature(-29 degree Celsius) admissible at compressor intake (heater function).

2.4 Bleed Heating

Hot air extracted from the GT compressor when required by the bleed heating function (guarantee of NOx emission, protect IGV against icing) is dispatched in the filter housing by the bleed heating(IBH) manifold. The IBH manifold is composed stainless steel acoustical nozzlws through the filter housing air path.

2.5 Implosion Doors

Implosion door equipped with electro magnetsm limit swictches, heating gaskets open (2300 Pa) to prevent from inlet system implosion in case of high high pressure drop level reached during shutdown period.

2.6 Inlet Duct and Silencer

Inlet duct and silencer system is composed of one Elbow, one silencer section, one extraction joint and one support structure.
The elbow and the silencer duct structure are made of stiffened carbon steel sheets protected against corrosion by a painting system.
Noise reduction is achieved by an arrangement of parabllel baffles, Baffles are made of stainless steel type AISI 304L structure and perforated sheets which protect the acoustic cushions made of mineral wool and fiber glass fabric.
As additional acoustic treatment, inlet duct walls are externally insulated with mineral wool and cladding.

2.7 Inlet Plenum

Inlet plenum is composed of a casing structure in several parts; a cone, a support structure. Casing structure and cone are made of stiffened carbon steel protected against corrosion by a painting system.
The plenum is fitted with pressure, temperature and dew point measurement connections. A drain connection located in the plenum floor enables washing water evacuation.