X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sun, 15 Jan 2012 10:39:02 -0500 Message-ID: X-Original-Return-Path: Received: from nskntmtas05p.mx.bigpond.com ([61.9.168.149] verified) by logan.com (CommuniGate Pro SMTP 5.4.3) with ESMTP id 5349990 for lml@lancaironline.net; Sat, 14 Jan 2012 07:31:46 -0500 Received-SPF: pass receiver=logan.com; client-ip=61.9.168.149; envelope-from=frederickmoreno@bigpond.com Received: from nskntotgx03p.mx.bigpond.com ([124.184.83.182]) by nskntmtas05p.mx.bigpond.com with ESMTP id <20120114123109.TOZT23624.nskntmtas05p.mx.bigpond.com@nskntotgx03p.mx.bigpond.com> for ; Sat, 14 Jan 2012 12:31:09 +0000 Received: from Razzle ([124.184.83.182]) by nskntotgx03p.mx.bigpond.com with ESMTP id <20120114123102.DOTM22866.nskntotgx03p.mx.bigpond.com@Razzle> for ; Sat, 14 Jan 2012 12:31:02 +0000 MIME-Version: 1.0 X-Original-Message-Id: <4F117579.0000FE.03964@RAZZLE> X-Original-Date: Sat, 14 Jan 2012 20:30:49 +0800 Content-Type: Multipart/Mixed; charset="us-ascii"; boundary="------------Boundary-00=_D3GSL52GSPT1VA400000" X-Mailer: IncrediMail (6244788) From: "Frederick Moreno" X-FID: FLAVOR00-NONE-0000-0000-000000000000 X-Priority: 3 X-Original-To: "Lancair Mail (lml@lancaironline.net)" Subject: Re: Ceramic exhaust coatings - careful y'all X-Authentication-Info: Submitted using SMTP AUTH LOGIN at nskntotgx03p.mx.bigpond.com from [124.184.83.182] using ID frederickmoreno@bigpond.com at Sat, 14 Jan 2012 12:30:59 +0000 X-SIH-MSG-ID: rRs2GNfuCkKhkDE4gja+bFg2l1K70SNytt9NBYd6+kVFXEfBvd/fS869e6BfwIbkxF0dcgr/bz8wYqj0XI3bsdi6IbVBWLDY5cI= --------------Boundary-00=_D3GSL52GSPT1VA400000 Content-Type: Multipart/Alternative; boundary="------------Boundary-00=_D3GSGG6GSPT1VA400000" --------------Boundary-00=_D3GSGG6GSPT1VA400000 Content-Type: Text/Plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Insulation wrapped on exhaust pipes and coatings that reduce the surface thermal emissivity both raise exhaust pipe temperature. =0D =0D So what? =0D =0D At these temperatures, the strength of the 321 stainless steel generally used in exhaust pipes is dropping like a rock - small temperature increas= es result in big strength decreases - and creep resistance drops even faster= =2E =0D =0D Oxidation is also increasing dramatically with temperature. =0D =0D In short, the exhaust pipes will fail much, much sooner due to cracking = or wall thinning. If you are driving a turbo, you run a double risk because= of the high pressures inside the exhaust pipes upstream of the turbo that stress tubing walls more and create blow torches when cracks form. =0D =0D In short, don't do it unless you pledge to inspect the pipes more often, like every time the cowl is off, and unwrap the pipes for a very careful inspection at EVERY annual. =0D =0D Data below. Out of curiosity I made an Excel plot, attached. It makes t= he point even better than the table below. Creep strength virtually zero a= t 800C =3D 1432F=0D =0D Sorry 'bout that. =0D =0D Fred Moreno=0D =0D 2. Properties at Elevated Temperatures =0D Short Time Elevated Temperature Tensile Strength =0D Temperature, oC600650700750800850=0D Tensile Strength, MPa390329280230190140=0D =0D Creep data =0D Stress to develop a creep rate of 1% in the indicated time at the indicat= ed temperature. =0D TimeTemperature oC550600650700800=0D 10 000 hStress MPa180100704010=0D 100 000 hStress MPa1208050255=0D =0D Creep Rupture Stress =0D TimeTemperature oC500600650700800=0D 1 000 hStress MPa2701801407030=0D 10 000 hStress MPa240130905010=0D 100 000 hStress MPa2009050155=0D =0D =0D =0D Subject: Re: [LML] Re: Ceramic exhaust coatings=0D =0D One other thought, I have heard both sides of this argument before as wel= l. I also heard it is nearly impossible to weld / repair pipes with this coating. I found a solution that solved the problem cheaply without makin= g the pipes more difficult to weld. I wrapped my entire exhaust system with hot rod exhaust wrap. I bought it at the local auto parts store in the 1" width. Spruce sells it as well. I tested the stuff with a torch in the hangar on my hand and was amazed how well it insulates. I have 2 layers i= n some very hot places on the pipes. In addition to reducing the inner cowl temps, It also tames the vibration of the pipes and reduces noise. =0D Cheap, relatively light and effective...=0D Fwiw. --------------Boundary-00=_D3GSGG6GSPT1VA400000 Content-Type: Text/HTML; charset="us-ascii" Content-Transfer-Encoding: quoted-printable
Insulation wrapped on exhaust pipes and coatings that reduce th= e surface thermal emissivity both raise exhaust pipe temperature.  <= /DIV>
 
So what? 
 
At these temperatures, the strength of the  321 stainless steel= generally used in exhaust pipes is dropping like a rock - smal= l temperature increases result in big strength decreases - and creep resi= stance drops even faster.
 
Oxidation is also increasing dramatically with temperature. 
 
In short, the exhaust pipes will fail much,  much sooner d= ue to cracking or wall thinning.  If you are driving a turbo, you ru= n a double risk because of the high pressures inside the exhaust pipes up= stream of the turbo that stress tubing walls more and create blow torches= when cracks form. 
 
In short, don't do it unless you pled= ge to inspect the pipes more often, like every time the cowl is off, and&= nbsp;unwrap the pipes for a very careful inspection at EVERY annual.=  
 
Data below.  Out of curiosity I made an Excel plot, attach= ed.  It makes the point even better than the table below.&= nbsp;  Creep strength virtually zero at 80= 0C =3D 1432F
 
Sorry 'bout that.
 
Fred Moreno
 

2. Propert= ies at Elevated Temperatures
= Short Time Elevated Temperature Tensile Strength

Creep data=
Stress to develop a creep ra= te of 1% in the indicated time at the indicated temperature.

Temperature, oC 600 650 700 750 800 850
Tensile Strength, MPa 390 329 280 230 190 140

Creep Rupture St= ress

Time Temperature oC 550 600 650 700 800
10 000 h Stress MPa 180 100 70 40 10
100 000 h Stress MPa 120 80 50 25 5
 
 
Subject: Re: [LML] Re: Ceramic exhaust coatings
<= /DIV>
 
One other thought, I have heard both sides of this argument before a= s well. I also heard it is nearly impossible to weld / repair pipes with = this coating. I found a solution that solved the problem cheaply without = making the pipes more difficult to weld. I wrapped my entire exhaust syst= em with hot rod exhaust wrap. I bought it at the local auto parts store i= n the 1" width. Spruce sells it as well. I tested the stuff with a torch = in the hangar on my hand and was amazed how well it insulates. I have 2 l= ayers in some very hot places on the pipes. In addition to reducing the i= nner cowl temps, It also tames the vibration of the pipes and reduces noi= se. 
Cheap, relatively light and effective...
Fwiw.

Time Temperature oC 500 600 650 700 800
1 000 h Stress MPa 270 180 140 70 30
10 000 h Stress MPa 240 130 90 50 10
100 000 h Stress MPa 200 90 50 15 5
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