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The Trent 1000 is a high bypass turbofan with three independent, coaxial shafts and a single annular combustor with 18 spray nozzles. The Low Pressure shaft with a swept-bladed, 2.85 m (9 ft 4 in) fan is powered by six axial turbines. The Intermediate Pressure spool with 8 axial compressors is turned by a single turbine stage. The six-stage ...
The pressure at which the control pilot relieves is the functional set pressure of the PORV. When the pilot valve reaches set pressure it opens and releases the pressure from the dome. The piston is then free to open and the main valve exhausts the system fluid. The control pilot opens either to the main valve exhaust pipe or to atmosphere ...
Permanent start-up, flush and bypass lines; Pipelines and flowlines; Blinds and spectacle blinds; Insulation and heat tracing; Process control instrumentation and designation (names, numbers, unique tag identifiers), including: Valves and their types and identifications (e.g. isolation, shutoff, relief and safety valves, valve interlocks)
GEnx on 747-8I prototype. As of 2016, the GEnx and the Rolls-Royce Trent 1000 were selected by Boeing following a run-off between the three big engine manufacturers. The GEnx uses some technology from the GE90 turbofan, [1] including swept composite fan blades and the 10-stage high-pressure compressor (HPC) featured in earlier variants of the engine.
The JT8D is an axial-flow front turbofan engine incorporating a two-spool design. There are two coaxially-mounted independent rotating assemblies: one rotating assembly for the low pressure compressor (LPC) which consists of the first six stages (i.e. six pairs of rotating and stator blades, including the first two stages which are for the bypass turbofan), driven by the second (downstream ...
In 2010, Pratt & Whitney proposed the PW9000 medium-bypass engine for the Next-Generation Bomber, using the PW1000G core with a direct-drive fan for a 4:1 bypass ratio. [37] Similar to the PW800, it has the F135 low-pressure section. [38] The Northrop Grumman B-21 Raider is powered by two 27,000 lbf (120 kN) PW9000s. [37] [failed verification]
Air admittance valves (AAVs, or commonly referred to in the UK as Durgo valves and in the US as Studor vents and Sure-Vent®) are negative-pressure-activated, one-way mechanical valves, used in a plumbing or drainage venting system to eliminate the need for conventional pipe venting and roof penetrations.
The high-pressure (HP) compressor operates at up to a 22:1 compression ratio, which is roughly double the corresponding value for the CFM56's HP compressor. [ 7 ] CFM uses ceramic matrix composites (CMC) to build the turbine shrouds. [ 8 ]