PVC Exhaust

Centek makes better tubes and fittings than pvc pipe for exhaust applications. The name of their product is VERNATUBE.

 

Hello watchkeeper,
My, are you a very sensitive and duplicitous type? If it was "offensive" Why REPEAT IT? All the words are in common use and in the English dictionary and not at this point banned for use on this forum... I think your concern is a bit excessive and irrelevant and I was not suggesting that you were guilty, of anything - unless you feel ashamed of your posts in some way? I was addressing the CONTENT and NOT THE AUTHORS, if applicable...

Hi FMS, could it be possible that you and Frosty are talking of the SAME product but in different countries called by different names to get around import/export duties and copyright labelling to name just three points that may apply...?

 

I have proven without a shadow of doubt over a 10 year period that PVC pipe with sufficient water cooling and protected by alrms for water flo is perfectly acceptable.

As is used By Vetus the world known exhaust specialists.

Of course there are companies that make things in other materials there always has been from wheels to pistons to the seats I sit on.

Alarms are important and if not working will cause fire wether you use plastic or stainless steel, the rubber connections will burn using either material.

I do believe I have 2 kettles on board and one at the house made of PVC for boiling water and as far as I know water can not get hotter than boiling.

Will you burn you hand placing it over you cars exhaust---- no

And neither will you over the water of your boats exhaust.

Is fibre glass better? --maybe but is an alluminium car wheel better. The cam belt cover on the engine is plastic so is the rocker cover , most air filter on cars are plastic tolerating under bonnet temps.

You got to re evaluate modern materials

 

My isn't this ironic...


Frosty I know it works for you, and don't want you to try because you don't need to prove it.... but have you been curious enough to drill a tiny hole and insert a pyrometer to check the actual temperature?
I'd be surprised if you are over 80C

 

I hav'nt actually Van. As you say I don't need to and after looking at that exhaust yesterday in the boat shop I am very pleased.

I did mention earlier and some time back now that the purpose of the thread was to expose the bull sift that is on this forum mostly spouted by the flat earth society squalking like beheaded chickens at anything they don't know about.

As guessed there performance was as expected and the reason for the bet was 2 fold --might have cought one of them and 2 to show them up.

Did'nt they do well?

I don't know whats up with mas As he often says if you don't like it don't look at it.

 

The accepted practise for a bet is someone holds the kitty, another 'unbiased expert' calls a decision and the losers losses. I guess it's easy if you throw down a challange then you decide what response you don't like - so we're to take your word for being an expert based on what exactly...

 

I don't have your experience in boats, Frosty, and I'll take your word that it's worked for you so far. But as a former general contractor I've seen a lot of mickey-moused construction and installations using inappropriate materials. And some of them had worked for years. That doesn't mean they were safe....

I'm not comfortable with the short distance between the normal operating temperatures of your exhaust and the temperatures at which it could fail; I like a little overkill. It's been my experience that things tend to go wrong at the worst possible moment -- and they like to go wrong in bunches, when you're already fighting other problems. That includes alarms.

Have you asked your insurance agent what his claims adjuster would say about your setup if it goes south?

 

I like a lot of overkill-that's why I have silicone.

Like I said before-I run a dedicated cold water line for my exhaust.
But if I have a problem I can always run down to the engine room and turn a couple valves and re-route the outfeed from the coolant into the exhaust.

Or I can keep my manifold EGT below 300.

In my area,often running in high currents in narrow channels- if you lose your engines you can be on the rocks in 30 seconds.

 

I hope your contempt for proper engineering procedures doesn't put you in harm's way at some point. Despite the invectives and childishness, I have followed this thread for pages. I enjoy anyone who looks at a problem and comes up with an original solution.

My objection [or lack of satisfaction] is that the limits are not known. You now have changed your story to say you have 10 years use on this boat. Most car recalls are done because a small number of drivers are injured or killed over a sample of thousands of vehicles. The sample size of one boat doesn't satisfy me alone that [even VINIDEX 100M] PVC is equally safe as higher-temperature materials installed in thousands of boats.

Even if it doesn't fail in one installation for 20 years,

• I wouldn't try this in a boat where the exhaust could splash electrical or flood anything critical if a glue joint failed
• or where there is only a single engine meaning any failure is dead in the water

You don't know the limits of your system. You don't know how close it is to failure or if there is an ample margin of safety. I know engines I've had on my boat have a temperature redline of 82 C / 180 F. The pipe you are using says it is rated for continuous duty to 60 C / 140 F and deformation at 80 C / 176 F. I don't know if there are any hotspots or how much water flows when idle or how long the pipe or joint would take to change properties. The rubber exhaust hose that joins the metal sections on exhausts I've had has always had a higher margin of safety of 120°C or higher. It is worth knowing that it hasn't failed in 10 years on your boat; I wouldn't choose it over a readily available higher-temperature material until it's known there is a reasonable safety margin.

 

It is? where did that come from I am not aware of that. Do you have a link for that. Thanks very much.

 

I searched for VINIDEX after you said your pipe was VINIDEX
http://www.hydrogold.com.au/jgp/pdf/lib.vinidex.pvc_pipe.pdf
I am not familiar with this product as you are; if you have different information that contradicts this please correct.

 

I don't know about Vinidex It was the thickest best underground what ever PVC pipe I could buy.

Im sure Vinidex was not aware that there product could be used for wet exhausts but if it lies within the specification then why not.

It has then therefore to be accepted that if the exhaust does not deform then the internal temperature can not be exceeding that specification QED.

 

Vindex is commonly used for outdoor pool inground piping having heavier wall thickness than mains (water) supply pipe to cope with higher deliver pressure and has some limited UV resistant property but regardless for ALL types of PVC pipes, continuous exposure to high temps coupled with vibration leads to premature brittle aging then failure = exhaust gases in the ER.

Usually its only third world unskilled workers (or cheating manufacturers)that use unsuitable products/materials for applications requiring approved products compliant to industry codes - the purpose to prevent accidents and loss of life. Being an expat I would have expected a more professional approach...

 

The application did not require approved products but thanks again for your input.

If you read the specs its very impressive.

I appreciate that this is elementary for you but In your highly skilled profession as manufacturer in a third world what would you consider an exhaust temp to be of a high speed turbo deisel.

And what do you think is a reasonable amount of time for an "in the field test" to show a satisfactory application of a product..

 

"And what do you think is a reasonable amount of time for an "in the field test" to show a satisfactory application of a product.."


Two minutes at full throthle with the Water injection shut off .

Just like the rule book says.

Test it and get back to us with your observations..