On 5/17/2020 8:30 PM, wrote:
On Sun, 17 May 2020 15:08:57 -0700 (PDT),
wrote:

On Thursday, February 25, 2016 at 3:50:38 PM UTC-5, wrote:
Polyvinyl Chloride or PVC is a flammable material with a melting point of 160 degrees C. Melting begins at about 140 degrees C. The building code does not allow PVC piping to be used as a dryer vent because it can catch fire at fairly low temperatures. The Uniform building code is written for safety considering the worst case scenario...like when the vent pipe gets blocked....a child shoves a Coke can into the vent...etc. PVC is used on some high efficacy furnaces and water heaters because the exhausting gasses are cool by the time the get to the PVC pipe. Please don'the risk burning your house down by using dryer vent materials that are not code approved and US approved for dryer vent use.
Allen Blaker
Building inspector for 31 years.

melting point of pvc is higher than that if it melted ay 120 you gould not use it for you hot water in your house

You can't.
You have to use CPVC, a different plastic compound. I have never seen
4" CPVC but I suppose someone might make it. You just don't find it at
the Home Depot.


CPVC I heard is brittle. Guy here had replaced his copper plumbing with
it and told me he was working near some of it under the sink and grabbed
it to position himself and it broke.

Most PVC we see is plasticized to make less brittle.

Regardless of the softness or melting point there is a fire hazard using
it in a drier vent as a fire in the vent would break out. Most plastics
could not handle a fire in the vent.

The stuff I had, a PVC coated spring got full of lint because birds were
getting in the vent and nesting. If the cat had not jumped to the top
of the drier hearing the birds we might not have known it and a fire
could have started. I had cleaned the tubing and the vent but it was
afterwards that an appliance repairman told me my old piping was out of
code. If we had a fire we could have a problem with insurance covering it.

Might mention I put a cage over the old vent flaps to keep out birds.

Many years ago we rented a house with drier in the basement and vent was
at ground level. A rabbit crawled into the vent and got dried to death.
Took a couple of days to get a repairman. We did not know about the
rabbit but just knew the drier was not working. Weather was warm and by
the time the repairman got there the rabbit was full of maggots. Hell
of a mess and odor in drier would not leave.

On Mon, 18 May 2020 01:05:52 -0500, kelown
wrote:


People used to use flexible plastic "duct" for dryers - the stuff
with the wire coil in it. I've seen it wherer basically only the coil
was left intact - with the plastic melted right out. That crap hasn't
been legal for likely 30 years or more (if it ever was)

Isn't PVC wire hosing still used for portable air conditioner exhaust?
https://amzn.to/3bIAw2U (hose with wire reinforcement)

Portable AC exhaust isn't hot.

Obviously. But my question was referring to the material the hose is
made of, to help determine whether such hose material is still being
legally sold.
What's that got to do with the price of brown eggs in idaho on
even-numbered Tuesdays???
The thread was about DRYER VENTS

On Mon, 18 May 2020 08:22:15 -0400, Frank wrote:

CPVC I heard is brittle. Guy here had replaced his copper plumbing with
it and told me he was working near some of it under the sink and grabbed
it to position himself and it broke.

Most PVC we see is plasticized to make less brittle.

This is the land of plastic plumbing and we also use PVC for lots of
other things. Sunlight will make it more brittle after a while but it
is still not glass. I have gopher tortoise burrow markers made from
3/4" PVC that have been out in Florida the sun for over a decade and
they still bend. CPVC doesn't seem to be affected any more than PVC
but if you are worried about it, use RNC (gray conduit). It is UV
stabilized.

On 5/18/2020 1:53 PM, wrote:
On Mon, 18 May 2020 08:22:15 -0400, Frank wrote:

CPVC I heard is brittle. Guy here had replaced his copper plumbing with
it and told me he was working near some of it under the sink and grabbed
it to position himself and it broke.

Most PVC we see is plasticized to make less brittle.

This is the land of plastic plumbing and we also use PVC for lots of
other things. Sunlight will make it more brittle after a while but it
is still not glass. I have gopher tortoise burrow markers made from
3/4" PVC that have been out in Florida the sun for over a decade and
they still bend. CPVC doesn't seem to be affected any more than PVC
but if you are worried about it, use RNC (gray conduit). It is UV
stabilized.


I know that PVC holds up well in sunlight. Went through this issue a
couple of years ago discussing a Trex deck. Trex is coated with PVC
because the original PE is not sunlight resistant.

I've been told by plumbers over the years that copper does not hold up
with our well water and neighbors have replaced it with CPVC and PEX. So
the CPVC comment is only from one neighbor. The PEX neighbor had
numerous leaks at the fittings.

I was 20 years ago with a pinhole leak in the copper that the plumber
recommended replacement but I have not had another leak since.

I have also since replaced the plumber.

On the original subject, we were addressing building codes. They do
change over the years and have additions to them.

"Frank" wrote in message
...
On 5/18/2020 1:53 PM, wrote:
On Mon, 18 May 2020 08:22:15 -0400, Frank wrote:

CPVC I heard is brittle. Guy here had replaced his copper plumbing with
it and told me he was working near some of it under the sink and grabbed
it to position himself and it broke.

Most PVC we see is plasticized to make less brittle.

This is the land of plastic plumbing and we also use PVC for lots of
other things. Sunlight will make it more brittle after a while but it
is still not glass. I have gopher tortoise burrow markers made from
3/4" PVC that have been out in Florida the sun for over a decade and
they still bend. CPVC doesn't seem to be affected any more than PVC
but if you are worried about it, use RNC (gray conduit). It is UV
stabilized.


I know that PVC holds up well in sunlight. Went through this issue a
couple of years ago discussing a Trex deck. Trex is coated with PVC
because the original PE is not sunlight resistant.

I've been told by plumbers over the years that copper does not hold up
with our well water and neighbors have replaced it with CPVC and PEX. So
the CPVC comment is only from one neighbor. The PEX neighbor had numerous
leaks at the fittings.

I was 20 years ago with a pinhole leak in the copper that the plumber
recommended replacement but I have not had another leak since.

There was a problem with pinholes in copper made in the early 70s
I've seen it in two houses built at that time

I have also since replaced the plumber.

On the original subject, we were addressing building codes. They do
change over the years and have additions to them.

On 5/18/2020 2:48 PM, Rod Speed wrote:


"Frank" wrote in message
...
On 5/18/2020 1:53 PM, wrote:
On Mon, 18 May 2020 08:22:15 -0400, Frank wrote:

CPVC I heard is brittle.Â* Guy here had replaced his copper plumbing
with
it and told me he was working near some of it under the sink and
grabbed
it to position himself and it broke.

Most PVC we see is plasticized to make less brittle.

This is the land of plastic plumbing and we also use PVC for lots of
other things. Sunlight will make it more brittle after a while but it
is still not glass. I have gopher tortoise burrow markers made from
3/4" PVC that have been out in Florida the sun for over a decade and
they still bend. CPVC doesn't seem to be affected any more than PVC
but if you are worried about it, use RNC (gray conduit). It is UV
stabilized.


I know that PVC holds up well in sunlight.Â* Went through this issue a
couple of years ago discussing a Trex deck.Â* Trex is coated with PVC
because the original PE is not sunlight resistant.

I've been told by plumbers over the years that copper does not hold up
with our well water and neighbors have replaced it with CPVC and PEX.
So the CPVC comment is only from one neighbor.Â* The PEX neighbor had
numerous leaks at the fittings.

I was 20 years ago with a pinhole leak in the copper that the plumber
recommended replacement but I have not had another leak since.

There was a problem with pinholes in copper made in the early 70s
I've seen it in two houses built at that time

I suspected something like that. Probably more of mechanical defects in
pipes rather than the copper itself. Only leaks I have had since were
in two shut off valves, also probably defective.

On Tue, 19 May 2020 04:48:30 +1000, cantankerous trolling geezer Rodent
Speed, the auto-contradicting senile sociopath, blabbered, again:

FLUSH the trolling senile asshole's latest troll**** unread

--
John addressing the senile Australian pest:
"You are a complete idiot. But you make me larf. LOL"
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