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Author Topic: Exhaust blankets?  (Read 4000 times)
Van
Billy Van Hagen
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« Reply #15 on: December 01, 2009, 07:04:43 PM »

Oh Yeah smart guy I know where Clifford is hiding your air throttle  Shocked Shocked Shocked Grin Grin Grin LOL, besides it's red! LOL Cheesy
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JohnEd
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« Reply #16 on: December 01, 2009, 08:42:09 PM »

Cliff,

I googled "wet blanket" and now I see the disconnect.  My fault...whats new.  I was looking into this stuff many years ago and the stuff like ATP was labeled "wet Wrap" I am certain....and you know what that must be worth at this stage.  TODAY I learned that "wet wrap" is the fibreglass tape that they use to wrap headers.  It must have some benefit but it must also be far less effective than ATP blankets and pipe covers.  Must....hear that?  I'll never learn.

Thanks Cliff.   The ATP site gives more ideas for when I talk to Don.

John
« Last Edit: December 02, 2009, 11:13:28 AM by JohnEd » Logged

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Zeroclearance
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« Reply #17 on: December 01, 2009, 10:34:19 PM »

Since Clifford mentioned his CAT "hardware"..     This is the largest CAT turbocharger to be installed in the US.   I was the first person to rebuild one.  The new Cat 3600 series "6 cylinder" was a repower on a Coast Guard cutter.   This new Napier failed on sea trials.   The boys in the engine shop forgot to remove the oil drain plugs (red plastic plugs)..    

This turbocharger has a solid billet compressor wheel that spun on the turbine wheel without a nut.   The inducer smallest diameter of the compressor wheel measured around 9".   I had to manufacture all the tooling to take this unit apart.   The repair manuals weren't even written yet.   This is one large turbocharger.   What you see is just the center section or cartridge.   It's on a 48" pallet.   The breaker bar that I made was 42"    

Back to the OP,  this unit was all sealed up in safety shielding/blankets, the turbo itself was water and oil cooled.   The shielding blankets are very impressive when installed on these large marine engines.   I requested that the CAT tech's not install the blankets until the turbocharger had been broken in..    I strongly recommend that folks that do install new turbochargers "wait" for awhile before the blankets get reinstalled.   Heat cycles make it or break it for your turbochargers health and long term performance..    Yes, it's easier to break everything on a engine dyno or load cell, but to mimic this in real world conditions it does take some time to get the turbine seals to seat.

« Last Edit: December 01, 2009, 10:37:41 PM by Zeroclearance » Logged
JohnEd
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« Reply #18 on: December 01, 2009, 11:03:35 PM »

Thats incredible.  You Photo Shop'd that entire thing....didn't you? Huh Grin Wink

Thanks for sharing,

John
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"An uneducated vote is a treasonous act more damaging than any treachery of the battlefield.
The price of apathy towards public affairs is to be ruled by evil men." Plato
“We can easily forgive a child who is afraid of the dark; the real tragedy of life is when men are afraid of the light.”
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Dreamscape
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« Reply #19 on: December 02, 2009, 03:57:50 AM »

Zeroclearance, I have been silently following your posts and it seems you know what you are talking about. It's great to have guys like you, Clifford and Don to name a few who give us experienced knowledge sharing. I know nothing about turbo's and I find it fascinating to follow the threads on the subject. As I have an 8v71N, I don't have the turbo to help the old gal along. Maybe some day!

Please don't get PO and leave, hang in there until the end! Wink We have lost some very good DD experienced folk over the last year, it saddens me to think that our DD experienced help is shrinking. I just like to read and learn all I can so that someday I can pay it forward.

Paul
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« Reply #20 on: December 02, 2009, 04:31:06 AM »

You guys and many others have proved that the blankets work and are not detrimental, the heat is kept from entering into the engine room, But I do contend that having insulation wrapped around the exhaust pipes drives the heat of the pipes up at least another 200 or 300 degrees, Kevin and Clifford are correct in the mandatory idle time prior to shut down. Because I can see the blankets holding the heat in, and the heat not only transferring out of the pipes but also back in the engine.

John Ed, when Clifford says check the Webb site, its not like Goggling it, you take the cursor (point) drag it over the high lighted area and press.

John
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tomhamrick
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« Reply #21 on: December 02, 2009, 05:27:24 AM »

Any one use these on the diesel generators to keep the bay cooler?
Tom Hamrick
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Tom Hamrick
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JackConrad
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« Reply #22 on: December 02, 2009, 05:33:27 AM »

Any one use these on the diesel generators to keep the bay cooler?
Tom Hamrick

We have not done that, but we kept the amount of exhaust system in the compartment at the bnre minimum. The exhaust manifold and a section of exhaust pipe straight down through the floor from the exhaust manifold. Muffler and all othe exhaust system is outside the compartment. We have 3 240 CFM bilge blowers moving the air through the compartment. The temperature in the compartment is usually about 10-15 degrees above ambient temperature. Our generator radiator is also remoted outside the compartment.  Jack
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luvrbus
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« Reply #23 on: December 02, 2009, 05:39:40 AM »

Tom, I use the blankets on my generator without a fan  but like Jack my radiator is a remote mount mine has never shut down from heat

good luck
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JohnEd
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« Reply #24 on: December 02, 2009, 11:27:43 AM »

John4104s,

Thanks for the tip on using the cursor.  I think I got it.  Now, could ya give me a hand with this zipper?

The temp of the exhaust is not raised by the "blanket".  That temp is determined by many factors that may confuse you or this issue.  Anyway, I am sure I can't go into any depth.  Really, now.  Just think about it.  Use your common sense...not to talk down now.  The temp at the ex post wont change much by your wrapping the header pipe or header or even the bumper, for that matter.  Thimk!  You see, the end of the pipe snugly up close to the manifold used to get just so hot...right?  The wrap just lets the whole durn pipe "stay" that hot till it finds it's way to the "turbo".  It is like sex, John

Hope this helps but I will need help to break it down any further/lower cause I only have so many communication skills on tap.  Oh, and thanks for the tips, I used my cursor lots in drafting this.

some regards,

John
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"An uneducated vote is a treasonous act more damaging than any treachery of the battlefield.
The price of apathy towards public affairs is to be ruled by evil men." Plato
“We can easily forgive a child who is afraid of the dark; the real tragedy of life is when men are afraid of the light.”
—Pla
Zeroclearance
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« Reply #25 on: December 02, 2009, 02:58:53 PM »

The temperatures are increased..   From the exit of cylinder head >exhaust manifold>turbine housing (turbo)> downpipe...

The blanket is keeping the heat from excaping thru radiation losses.   The overall temps are higher.    We have to minimize the damage to the turbine wheel/bearings/ and turbine seals on shutdowns..    Cooling the engine on idle for 2 minutes is a "great" thing..
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johns4104s
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« Reply #26 on: December 02, 2009, 03:03:07 PM »

John ed

Great job on the Go ogle and Cursor. Do I detect you are interested in a little help learning about the birds and bees?

The pipe without insulation transfers  the heat  away from the pipe using mosly conduction . When you wrap the insulation around the pipe you transfer the heat by convection. This heat cannot escape from under the insulation so it increases in temperature and covects up and down the pipe to the Turbo and down to the muffler. The hot engine/heat fumes push it mostly down and out.

I am sure this is over board but I feel it is the case.
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JohnEd
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« Reply #27 on: December 02, 2009, 03:50:46 PM »

Sex?  I was talking about my jacket zipper.  Why is you mind on my crotch.

Much as I enjoy sparing with you, there is no challenge to an unarmed opponent.  We are way way off topic with this.  You have my number....and I guess I need to clarify that to Phone Number.  Off line is better for the board.  Its you call....literally.

Still love Ya,

John
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"An uneducated vote is a treasonous act more damaging than any treachery of the battlefield.
The price of apathy towards public affairs is to be ruled by evil men." Plato
“We can easily forgive a child who is afraid of the dark; the real tragedy of life is when men are afraid of the light.”
—Pla
Brassman
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« Reply #28 on: December 02, 2009, 06:43:46 PM »

On marine engines the exhaust blankets and shielding are regulatorally required for fire safety (and they do increase turbo efficency). The use of post (and prelube) pumps are also common, so as to not coke the turbo bearings.
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