Fuel system inhibiting, Other Engineering

Assignment Help:

Fuel system inhibiting.

The fuel used in turbine engines usually contains a small quantity of water which, if left in the system, could cause corrosion. All the fuel should therefore be removed and replaced with an approved inhibiting oil by one of the following methods:

Motoring Method

This should be used on all installed engines where it is convenient to turn the engine using the normal starting system. A header tank is used to supply inhibiting oil through a suitable pipe to the engine. A filter and an on/off cock are incorporated in the supply pipe, which should be connected to the low pressure inlet to the engine fuel system and the aircraft LP cock closed. After draining the engine fuel filter a motoring run should be carried out bleeding the high pressure pump and fuel control unit, and operating the HP cock several times while the engine is turning. Neat inhibiting oil will eventually be discharged through the fuel system and combustion chamber drains. When the motoring run is complete the bleeds should be locked, the oil supply pipe disconnected and all apertures sealed or blanked off.

Pressure Rig Method 

This may be used on an engine which is installed either in the aircraft or in an engine stand. A special rig is used which circulates inhibiting oil through the engine fuel system at high pressure. The fuel filter should be drained and, where appropriate, the aircraft LP cock closed. The inlet and outlet pipes from the rig should be connected to the high pressure fuel pump pressure tapping and the system low pressure inlet respectively, and the rig pump turned on. While oil is flowing through the system the components should be bled and the HP cock operated several times. When neat inhibiting oil flows from the combustion chamber drains the rig should be switched off and disconnected, the bleed valves locked and all apertures sealed or blanked off.

Gravity Method 

This is used when the engine cannot be turned. A header tank similar to the one used in the motoring method is required but in this case the feed pipe is provided with the fittings necessary for connection at several positions in the engine fuel system. The fuel filter should first be drained then the oil supply pipe connected to each of the following positions in turn, inhibiting oil being allowed to flow through the adjacent pipes and components until all fuel is expelled:

(a) High pressure fuel pump pressure tapping.
(b) Fuel control unit pressure tapping.
(c) Burner Manifold.
(d) Low pressure inlet pipe.

Components should be bled at the appropriate time and the HP cock operated several times when inhibiting the fuel control unit. All bleeds and apertures should be secured when the system is full of inhibiting oil.

 


Related Discussions:- Fuel system inhibiting

Control engineering, what are the components, applications, benefits and dr...

what are the components, applications, benefits and drawbacks of control engineering?????

How do comets get their tails, How do comets get their tails? - Most comet...

How do comets get their tails? - Most comets stay frozen in the outer solar system. Only a few enter the inner solar system where they can grow tails. - When a comet nears the sun

Vlsi, Working of bi- CMOS invertor in vlsi

Working of bi- CMOS invertor in vlsi

Case study, Which type of financing is appropriate to each firm?

Which type of financing is appropriate to each firm?

False alarms & cm , False Alarms & CM  The mis-association of false ...

False Alarms & CM  The mis-association of false alarms with target tracks has two main e!ects.  - It tends to increase the actual tracking errors in the system because

Siliconizing, 1.defination 2.explain the mechanisms of each process. 3. exp...

1.defination 2.explain the mechanisms of each process. 3. explain in detail how many types of each process 4. advantages 5. disadvantages

Fire alarm systems - look for when inspecting, Fire alarm systems: Fir...

Fire alarm systems: Fire alarm systems can be very complex and it is usually not possible for an enforcing officer to check all the cabling, the components, the software and t

Wing design for a sports glider , Wing design for a sports glider  Th...

Wing design for a sports glider  The justification of the aerofoil selection with appropriate data, based on tunnel work or computational analysis.  Sizing of the wing in

New building completion - fire safety management, Ne w building completion...

Ne w building completion: New buildings have to be constructed to meet certain fire safety standards.  It is not acceptable for buildings to be built that do not attain a min

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd