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Search: Posts Made By: sooty655
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Forum: Rumours & News
30th Oct 2009, 11:43
Replies: 3,239
Views: 1,137,456
Posted By sooty655

Too bad you haven't been reading the thread. :* ...

Too bad you haven't been reading the thread. :*

If you had, you would realise the problem wasn't in the filter. :ugh:

Sooty
Forum: Rumours & News
15th Aug 2009, 19:30
Replies: 3,239
Views: 1,137,456
Posted By sooty655

Can't all be right, guys. :confused: At the...

Can't all be right, guys. :confused:

At the risk of stating the obvious, either

1) There was water in the uploaded fuel, or

2) The amount of water condensed from the incoming air was much...
Forum: Rumours & News
16th Jul 2009, 16:09
Replies: 3,239
Views: 1,137,456
Posted By sooty655

Will, See my post 2443. It is only the...

Will,

See my post 2443. It is only the Trent based on a tiny sample of three engine rollbacks on two flights. No-one knows how many times other power plants have been hit with enough ice to...
Forum: Rumours & News
12th Jun 2009, 15:41
Replies: 3,239
Views: 1,137,456
Posted By sooty655

I was also in the industry for a number of years...

I was also in the industry for a number of years (outside the UK). Where I worked, the Jet-A1 was kept totally separate from the other products within the refinery, but was transfered to the...
Forum: Rumours & News
5th Apr 2009, 17:36
Replies: 3,239
Views: 1,137,456
Posted By sooty655

Not sure about your wording there, airfoilmod....

Not sure about your wording there, airfoilmod. I'm sure GE, RR and others all designed for the level of fuel icing anticipated/specified by Boeing.

If the GE arrangement really is better at...
Forum: Rumours & News
22nd Mar 2009, 17:06
Replies: 3,239
Views: 1,137,456
Posted By sooty655

Swedish Steve has pointed out that the T800 also...

Swedish Steve has pointed out that the T800 also has an air-cooled oil cooler - presumably this is intended to cover for any lack of cooling capacity at low fuel flow rates.

Sooty
Forum: Rumours & News
22nd Mar 2009, 15:23
Replies: 3,239
Views: 1,137,456
Posted By sooty655

Oops

Mea culpa. I forgot to allow for the flow rates.

However, I stand by the original description of why the flow paths are chosen the way they are.

Sooty
Forum: Rumours & News
21st Mar 2009, 21:20
Replies: 3,239
Views: 1,137,456
Posted By sooty655

Rightbase

The design basis is that it is an oil cooler, not a fuel heater.



That is why the oil takes a convoluted path around the tubes, diverted back and forth by baffles, to ensure a (relatively)...
Forum: Rumours & News
20th Mar 2009, 09:31
Replies: 3,239
Views: 1,137,456
Posted By sooty655

Maybe it's the right amount of ice......

...to collect in a GE90 interstage strainer (or block a T800 FOHE) but not enough to fill the strainer and overspill into the bypass. I wonder if there are any records of GE90s with transient high...
Forum: Rumours & News
19th Mar 2009, 19:47
Replies: 3,239
Views: 1,137,456
Posted By sooty655

GE filter ??

I can understand the suggestion that placing the FOHE after the HP pump may protect the GE system by "mashing" the ice to slurry in the pump, but doesn't the GE arrangement have an LP filter?...
Forum: Rumours & News
18th Mar 2009, 19:37
Replies: 3,239
Views: 1,137,456
Posted By sooty655

I would guess that the intention is to provide a...

I would guess that the intention is to provide a smooth rapid flow into the tubes to hasten the icy slurry through. The pockets around the protruding tube ends will be stagnant areas and encourage...
Forum: Rumours & News
9th Mar 2009, 20:31
Replies: 3,239
Views: 1,137,456
Posted By sooty655

And don't forget that the energy to heat the fuel...

And don't forget that the energy to heat the fuel is paid for in increased fuel burn. Only a small proportion of that comes back in the efficiency gain of hotter fuel for combustion
Forum: Rumours & News
8th Mar 2009, 19:55
Replies: 3,239
Views: 1,137,456
Posted By sooty655

Solution to wrong problem, perhaps

Stopping the ice build-up in the FOHE is IMHO addressing the symptoms, not the disease. If there is sufficient incipient ice in the fuel flow, when the holes in the cheese line up it will find...
Forum: Rumours & News
8th Mar 2009, 16:59
Replies: 3,239
Views: 1,137,456
Posted By sooty655

Airfoilmod

Entirely agree with your last post.



I thought the "possible problem" as identified by AAIB was an ice build-up on the inlet tubesheet of the FOHE. So the need would be to prevent ice release...
Forum: Rumours & News
8th Mar 2009, 16:32
Replies: 3,239
Views: 1,137,456
Posted By sooty655

The differential pressure across the oil side of...

The differential pressure across the oil side of the exchanger will increase with cooler oil and decrease with warmer oil. So as the oil cools, the differential pressure valve will allow more oil to...
Forum: Rumours & News
6th Mar 2009, 20:04
Replies: 3,239
Views: 1,137,456
Posted By sooty655

The bypass valve is opened by differential...

The bypass valve is opened by differential pressure, basically similar to a relief valve. You were right that there is no thermostatic bypass, only the diff pressure one.

I haven't been able to...
Forum: Rumours & News
3rd Mar 2009, 20:07
Replies: 3,239
Views: 1,137,456
Posted By sooty655

I think we are saying the same thing with...

I think we are saying the same thing with different words. I agree the fuel temperature has no direct effect on the bypass. However, the continuous flow of cold fuel would grossly overcool the oil...
Forum: Rumours & News
2nd Mar 2009, 19:14
Replies: 3,239
Views: 1,137,456
Posted By sooty655

Afaik the bypass on the oil side is thermostatic,...

Afaik the bypass on the oil side is thermostatic, and diverts oil flow through or around the FOHE to maintain oil temperature. It is designed to cope with a wide range of fuel temperatures from...
Forum: Rumours & News
28th Feb 2009, 20:05
Replies: 3,239
Views: 1,137,456
Posted By sooty655

Oil cooling, not fuel heating

I don't think so. The system controls only on the oil temperature. When the oil doesn't need cooling, there is no oil flow through the exchanger, and no fuel heating. The (very small) efficiency gain...
Forum: Rumours & News
10th Nov 2008, 12:37
Replies: 3,239
Views: 1,137,456
Posted By sooty655

Afaik it's the other way round. The fuel makes a...

Afaik it's the other way round. The fuel makes a single uncontrolled pass through the tubes. The oil passes around the outside of the tubes, guided by the baffles.

Oil temperature is controlled...
Forum: Rumours & News
4th Nov 2008, 19:03
Replies: 3,239
Views: 1,137,456
Posted By sooty655

Same applies to the Fuel Oil Heat Exchanger (also...

Same applies to the Fuel Oil Heat Exchanger (also known as a fuel-cooled oil cooler). It is controlled only on oil temperature. Any heating of the fuel is co-incidental and uncontrolled.
Forum: Rumours & News
31st Oct 2008, 20:32
Replies: 3,239
Views: 1,137,456
Posted By sooty655

The Trent certainly has some fuel system...

The Trent certainly has some fuel system components mounted on the outside of the fan case. I'm not certain but afaik the GE90 has all the system mounted on the core.

However, both engines have...
Forum: Rumours & News
7th Sep 2008, 14:48
Replies: 3,239
Views: 1,137,456
Posted By sooty655

barit1 said It would have to be a fuel...

barit1 said


It would have to be a fuel storable as a liquid to get the package down to a reasonable size - maybe propane - and it would still require a large, heavy, high pressure bottle. Why...
Forum: Rumours & News
5th Sep 2008, 16:24
Replies: 3,239
Views: 1,137,456
Posted By sooty655

I think the previous posts questioning the...

I think the previous posts questioning the temperatures reached within the pylon pipework may be significant.

In the refining and petro-chem industries, pipework which is subject to icing, waxing...
Showing results 1 to 24 of 24


 
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