[Ashton Crusher[_2_]]

I have a bunch of white Teflon pipe thread tape. I wanted some
thicker tape and the only thing I could find at the store was the
usual thin white stuff for water lines and some thicker stuff that was
yellowish in color and labeled for use on gas, kerosene, LPG. Doesn't
say anything about water. The white stuff doesn't say what kind of
liquid but does say for use on pipe threads.

I assumed there was some actual difference between the two making the
white stuff unsuitable for gas lines. But I just looked at them and
they are all labeled as MIL-27730A . Seems like the only difference
is one is colored yellow and is a little bit thicker.

Anyone know why the one claims to be for gas when it's listed as the
same mil spec as the white?

[Bob]

On Saturday, December 13, 2014 9:31:03 PM UTC-5, Ashton Crusher wrote:
I have a bunch of white Teflon pipe thread tape. I wanted some
thicker tape and the only thing I could find at the store was the
usual thin white stuff for water lines and some thicker stuff that was
yellowish in color and labeled for use on gas, kerosene, LPG. Doesn't
say anything about water. The white stuff doesn't say what kind of
liquid but does say for use on pipe threads.

I assumed there was some actual difference between the two making the
white stuff unsuitable for gas lines. But I just looked at them and
they are all labeled as MIL-27730A . Seems like the only difference
is one is colored yellow and is a little bit thicker.

Anyone know why the one claims to be for gas when it's listed as the
same mil spec as the white?

Google / look at McMaster Carr catalog for teflon tape
http://www.mcmaster.com/#pipe-thread-tape/=v0hqfp
You'll see what is available fir width, thckness, color et cetera

[Ralph Mowery]

"Ashton Crusher" wrote in message
...
I have a bunch of white Teflon pipe thread tape. I wanted some
thicker tape and the only thing I could find at the store was the
usual thin white stuff for water lines and some thicker stuff that was
yellowish in color and labeled for use on gas, kerosene, LPG. Doesn't
say anything about water. The white stuff doesn't say what kind of
liquid but does say for use on pipe threads.

I assumed there was some actual difference between the two making the
white stuff unsuitable for gas lines. But I just looked at them and
they are all labeled as MIL-27730A . Seems like the only difference
is one is colored yellow and is a little bit thicker.

Anyone know why the one claims to be for gas when it's listed as the
same mil spec as the white?


Mainly because of the thickness.

When PTFE (Teflon) tape first became available they only made it in the
common single density type, which we commonly find in the hardware and home
supply stores. Later they began making a double density version, which was
twice as thick. Many state and local codes then adopted the double density
type as mandatory when making connections for natural gas however since both
products were the same color (white) it was difficult for inspectors to be
sure which product had been used. PTFE tape is now made in numerous
varieties and they have issued a color standard to determine which type
should be used.

WHITE-Single density- should only be used on NPT threads up to 3/8 inch.
YELLOW- Double Density- yellow double density is often labeled as "Gas type"
RED-Triple Density: (Note-the container is red but the tape itself appears
as a pale pink color). Presently required on all joints ½" diameter or
greater.
GREEN- Oil Free PTFE tape- Required for use on all lines conveying oxygen
(I.E. -medical oxygen or welding oxygen lines).
COPPER COLOR- contains granules of copper and is to be used as a thread
lubricant but is not approved as a thread sealant. (Generally it is used as
a thread lubricant on bolts or pipe threads for mechanical applications
where no physical seal is required.)

PTFE tape is only approved as a thread seal when applied correctly. To apply
you begin at the end of the pipe and wrap the tape under tension in the
direction of the thread turns. Each successive layer should overlap the
previous layer by ½ to 2/3 and continue wrapping until the entire threaded
portion of the pipe is covered. (Minimum of 3 full turns).



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[[email protected]]

On Sat, 13 Dec 2014 19:24:12 -0700, Ashton Crusher
wrote:

I have a bunch of white Teflon pipe thread tape. I wanted some
thicker tape and the only thing I could find at the store was the
usual thin white stuff for water lines and some thicker stuff that was
yellowish in color and labeled for use on gas, kerosene, LPG. Doesn't
say anything about water. The white stuff doesn't say what kind of
liquid but does say for use on pipe threads.

I assumed there was some actual difference between the two making the
white stuff unsuitable for gas lines. But I just looked at them and
they are all labeled as MIL-27730A . Seems like the only difference
is one is colored yellow and is a little bit thicker.

Anyone know why the one claims to be for gas when it's listed as the
same mil spec as the white?

The yellow tape will work fine for water.

[Stormin Mormon[_10_]]

On 12/13/2014 9:24 PM, Ashton Crusher wrote:
I have a bunch of white Teflon pipe thread tape. I wanted some
thicker tape and the only thing I could find at the store was the
usual thin white stuff for water lines and some thicker stuff that was
yellowish in color and labeled for use on gas, kerosene, LPG. Doesn't
say anything about water. The white stuff doesn't say what kind of
liquid but does say for use on pipe threads.

I assumed there was some actual difference between the two making the
white stuff unsuitable for gas lines. But I just looked at them and
they are all labeled as MIL-27730A . Seems like the only difference
is one is colored yellow and is a little bit thicker.

Anyone know why the one claims to be for gas when it's listed as the
same mil spec as the white?

I was told years ago, the white stuff tends to
flake off, and the flakes get into the natural
gas, and clog filters and orifices. Not sure
how accurate is that?

--
..
Christopher A. Young
Learn about Jesus
www.lds.org
..

[nestork]

Originally Posted by Stormin Mormon[_10_]

I was told years ago, the white stuff tends to
flake off, and the flakes get into the natural
gas, and clog filters and orifices. Not sure
how accurate is that?

I wouldn't buy that.

It seems to me that all teflon tapes are made of the same stuff; teflon. So, if the thin white stuff "flakes off" in the presence of natural gas, then you'd expect that every tape made of teflon would do the same, only perhaps to a greater or lesser extent.

Also, the gas piping code requires a sediment trap be installed after the gas shut-off valve but before the gas valve of each gas appliance:

http://activerain.com/image_store/up...imenttrap2.png

The whole idea here is that any dirt or foreign matter in the gas stream would accumulate in the trap instead of clogging up the gas valve to the appliance. If teflon tape were to "flake off", then it would be common knowledge that these traps would contain particles of teflon tape, and I've never heard of that before.

[rbowman]

Stormin Mormon wrote:

I was told years ago, the white stuff tends to
flake off, and the flakes get into the natural
gas, and clog filters and orifices. Not sure
how accurate is that?

I never had that problem. I wouldn't be surprised if it wasn't an urban
legend started by people who didn't lnow how to use teflon tape.

[Reggie[_3_]]

"rbowman" wrote in message
...
Stormin Mormon wrote:

I was told years ago, the white stuff tends to
flake off, and the flakes get into the natural
gas, and clog filters and orifices. Not sure
how accurate is that?

I never had that problem. I wouldn't be surprised if it wasn't an urban
legend started by people who didn't lnow how to use teflon tape.


seems you would have to put the thread not only on the threads, but slop it
over the pipe channel in order to have any flake off into the gas flow.

[nestork]

Originally Posted by Reggie[_3_]

seems you would have to put the thread not only on the threads, but slop it
over the pipe channel in order to have any flake off into the gas flow.

You're saying that the tapered pipe threads would grip the tape and prevent flakes of it from coming loose.

That makes sense. If the teflon is tightly squeezed between the male pipe threads and the female pipe threads, how do "flakes" of it get into the gas stream? The taping would have had to have been done by a monkey for there to be loose teflon tape flapping around in the gas stream.

[Stormin Mormon[_10_]]

On 12/14/2014 12:32 PM, rbowman wrote:
Stormin Mormon wrote:

I was told years ago, the white stuff tends to
flake off, and the flakes get into the natural
gas, and clog filters and orifices. Not sure
how accurate is that?

I never had that problem. I wouldn't be surprised if it wasn't an urban
legend started by people who didn't lnow how to use teflon tape.


That's very possible, but my hair dresser's
cousin who knows someone who had a dog die
in a furnace explosion seemed to be very
certain of her facts.

Like you say, who knows?

--
..
Christopher A. Young
Learn about Jesus
www.lds.org
..

[Phil Kangas[_4_]]

"rbowman" wrote in message Stormin Mormon
wrote:

I was told years ago, the white stuff tends to
flake off, and the flakes get into the natural
gas, and clog filters and orifices. Not sure
how accurate is that?

I never had that problem. I wouldn't be
surprised if it wasn't an urban
legend started by people who didn't lnow how to
use teflon tape.


Yes, the problem is that some people allow the
tape
to 'overhang' the end of the threads. The first
groove
should be visible. Any overhang will get extruded
off
the connection and a string will head downstream
causing problems.

[Ashton Crusher[_2_]]

On Sat, 13 Dec 2014 23:19:05 -0500, "Ralph Mowery"
wrote:


"Ashton Crusher" wrote in message
.. .
I have a bunch of white Teflon pipe thread tape. I wanted some
thicker tape and the only thing I could find at the store was the
usual thin white stuff for water lines and some thicker stuff that was
yellowish in color and labeled for use on gas, kerosene, LPG. Doesn't
say anything about water. The white stuff doesn't say what kind of
liquid but does say for use on pipe threads.

I assumed there was some actual difference between the two making the
white stuff unsuitable for gas lines. But I just looked at them and
they are all labeled as MIL-27730A . Seems like the only difference
is one is colored yellow and is a little bit thicker.

Anyone know why the one claims to be for gas when it's listed as the
same mil spec as the white?


Mainly because of the thickness.

When PTFE (Teflon) tape first became available they only made it in the
common single density type, which we commonly find in the hardware and home
supply stores. Later they began making a double density version, which was
twice as thick. Many state and local codes then adopted the double density
type as mandatory when making connections for natural gas however since both
products were the same color (white) it was difficult for inspectors to be
sure which product had been used. PTFE tape is now made in numerous
varieties and they have issued a color standard to determine which type
should be used.

WHITE-Single density- should only be used on NPT threads up to 3/8 inch.
YELLOW- Double Density- yellow double density is often labeled as "Gas type"
RED-Triple Density: (Note-the container is red but the tape itself appears
as a pale pink color). Presently required on all joints ½" diameter or
greater.
GREEN- Oil Free PTFE tape- Required for use on all lines conveying oxygen
(I.E. -medical oxygen or welding oxygen lines).
COPPER COLOR- contains granules of copper and is to be used as a thread
lubricant but is not approved as a thread sealant. (Generally it is used as
a thread lubricant on bolts or pipe threads for mechanical applications
where no physical seal is required.)

PTFE tape is only approved as a thread seal when applied correctly. To apply
you begin at the end of the pipe and wrap the tape under tension in the
direction of the thread turns. Each successive layer should overlap the
previous layer by ½ to 2/3 and continue wrapping until the entire threaded
portion of the pipe is covered. (Minimum of 3 full turns).



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http://www.avast.com


Thanks.

[nestork]

Originally Posted by Phil Kangas[_4_]

"rbowman" wrote in message Stormin Mormon
wrote:

I was told years ago, the white stuff tends to
flake off, and the flakes get into the natural
gas, and clog filters and orifices. Not sure
how accurate is that?

I never had that problem. I wouldn't be
surprised if it wasn't an urban
legend started by people who didn't lnow how to
use teflon tape.


Yes, the problem is that some people allow the
tape
to 'overhang' the end of the threads. The first
groove
should be visible. Any overhang will get extruded
off
the connection and a string will head downstream
causing problems.

I dunno. I wouldn't expect to find that in a DIY'ers work. Generally, what you find is that DIY'ers will go out of their way to do things as carefully as they can when they're working on their own house, so as to avoid problems like gas or water leaks later. They'll be as careful wrapping those threads as you would expect of anyone wanting to ensure they stand the best chance of avoiding a possible leak.

Not saying it can't happen... but I wouldn't expect that of a DIY'er working on a project in his own house.

[rbowman]

nestork wrote:

I dunno. I wouldn't expect to find that in a DIY'ers work. Generally,
what you find is that DIY'ers will go out of their way to do things as
carefully as they can when they're working on their own house, so as to
avoid problems like gas or water leaks later. They'll be as careful
wrapping those threads as you would expect of anyone wanting to ensure
they stand the best chance of avoiding a possible leak.

It's more likely they will wrap the teflon in the wrong direction. Rather
than forcing the tape into the threads when the fitting is screwed in, it
will tend to unwrap the tape and can be messy.

[Tekkie®]

nestork posted for all of us...



'Stormin Mormon[_10_ Wrote:
;3321103']
I was told years ago, the white stuff tends to
flake off, and the flakes get into the natural
gas, and clog filters and orifices. Not sure
how accurate is that?


I wouldn't buy that.

It seems to me that all teflon tapes are made of the same stuff; teflon.
So, if the thin white stuff "flakes off" in the presence of natural
gas, then you'd expect that every tape made of teflon would do the same,
only perhaps to a greater or lesser extent.

Also, the gas piping code requires a sediment trap be installed after
the gas shut-off valve but before the gas valve of each gas appliance:

http://tinyurl.com/mupmbvp

The whole idea here is that any dirt or foreign matter in the gas stream
would accumulate in the trap instead of clogging up the gas valve to the
appliance. If teflon tape were to "flake off", then it would be common
knowledge that these traps would contain particles of teflon tape, and
I've never heard of that before.




--
nestork

Stumped alert, he got another one!

--
Tekkie