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Default Can galvanized fittings be used with black iron pipe?

On Jan 21, 10:59*pm, David Nebenzahl wrote:
On 1/21/2011 9:58 PM RicodJour spake thus:

I would not mix galvanized and black iron directly, even if it's
allowed, as that accelerates corrosion. *You'd have to use a
dielectric fitting.


Now *that* makes my BS meter twitch just a mite: why would there be
corrosion? Galvanized pipe is zinc over steel, so galvanized + steel
(black) should be no problem, right?

--
Comment on quaint Usenet customs, from Usenet:

* *To me, the *plonk...* reminds me of the old man at the public hearing
* *who stands to make his point, then removes his hearing aid as a sign
* *that he is not going to hear any rebuttals.


To add to that. The "zinc" on the galvanised never touches the "black
iron". Threading removes the zinc plating in that area and the
fittings never screw together far enough for the zinc to touch the
unplated pipe/fitting.

Harry K
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Default Can galvanized fittings be used with black iron pipe?

On Jan 21, 9:19*pm, Mikepier wrote:
Was at Lowes tonight picking up stuff for hooking up my HW heater this
weekend and found out they did not have anymore 1/2" Tee's in black
iron for my gas line. But they had galvanized 1/2" Tee's.
Can I mix the 2?


I asked this question of my mechanical engineering mentor nearly ~35
years ago.
He's long gone & I have mixed installations that has been in service
for over 30 years.

He's comment to me back in the 70's was........

"The myth that natural gas causes galvanizing to flake off is an old
wives tale that has debunked by testing, go ahead and use it"

Here is a link to pretty detailed thread on the subject, including
cites from the IRC.

http://www4.iccsafe.org/cgi-bin/ulti...c;f=2;t=002632

a couple guys go back & forth but I'm putting my money on the IRC,
posts in the cited thread by dsjtecserv & my mentor.
He had YEARS of industrial mechanical engineering experience,
including being the chief engineer on design & construction of a
natural gas to fertilizer plant.

YMMV but has been pretty good so far

cheers
Bob
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Default Can galvanized fittings be used with black iron pipe?

On Jan 22, 8:00*pm, David Nebenzahl wrote:
On 1/22/2011 1:08 PM RicodJour spake thus:





On Jan 22, 3:38 pm, wrote:


On Sat, 22 Jan 2011, RicodJour wrote:


On Jan 22, 1:59 am, David Nebenzahl
wrote:


Now *that* makes my BS meter twitch just a mite: why would
there be corrosion? Galvanized pipe is zinc over steel, so
galvanized + steel (black) should be no problem, right?


Time to recalibrate that meter, kimosabe. *Zinc is used as a
sacrificial anode in boats for the very reason that it will
corrode first and protect the iron.
http://www.mikeholt.com/mojonewsarch...alvanic-Action....


YOur BS meter needs recalibrating. The ZINC may corrode, but that
is not an issue here. It is a very thin coating on one surface that
is beinf threaded to another (identical) surface. NOT an issue.
Period.


Why would the zinc corroding not *be an issue?
If you have a galvanized pipe and the coating is compromised in any
way, the corrosion will be concentrated at that point, right?


This still makes no sense to me. (And just for the record, whenever I've
plumbed for gas I've used black pipe, not galvanized.)

I mean, with black pipe, the entire goddamned pipe and every fitting is
subject to corrosion, right? Except for the mill scale, or whatever
constitutes the "black" on black pipe, it's completely unprotected.
That's why we use galvanized for water. So if you use a galvanized
fitting on a run of black pipe, it sure as hell is not going to corrode
any faster than the rest of the pipe, so why sweat it *on that basis*?

There may be other reasons not to use galvanized with gas lines: all the
pros I've talked to about this lately tell me it makes no difference.
Nonetheless, most people still use black for gas.

--
Comment on quaint Usenet customs, from Usenet:

* *To me, the *plonk...* reminds me of the old man at the public hearing
* *who stands to make his point, then removes his hearing aid as a sign
* *that he is not going to hear any rebuttals.- Hide quoted text -

- Show quoted text -


To the above I would add that the comparison to the boat use of zinc
as a
sacrificial anode is invalid, unless the pipe in question is being
used in
an environment where it's EXPOSED TO AN ELECTROLYTE. The
electrolyte essentially completes a circuit that allows current to
flow. In
the case of boats, that electrolyte is water, or even worse, salt
water.
With the boat, you have sacraficial zinc plates electrically bonded to
the
underwater metal parts, ie shafts, props, struts, etc. The circuit
looks
like two different metals, ie bronze and zinc, sitting in a beaker of
salt
water. Very similar to the experiment kids can do, using a lemon, a
dime, and a penny to make a battery. As the current flow, the zinc
erodes and slowly disappears.

With galvanized pipe installed on a gas line indoors, you don't have
an
electrolyte. If it were buried, then you could have an issue. But
buried
you have an issue with black steel too. I think it's still being
allowed in
some areas. But it's supposed to be coated and or wrapped with tape
to prevent corrosion. A process that is far from perfect. I've
seen
black steel pipe fail underground in as little as five years. It
looked
like swiss cheese, hard to believe. But it was obvious what had
ocurred. You could see where the installers had used black pipe and
then poured the tar like coating over the top of it after it was
installed
in the trench. The bottom portion did not get coated and that is
where the failure ocurrred. I remember at the time, mid 90s, we had
the gas company involved in recommending what to do at a 120
unit condo. At that time even they were undecided which was better
for that application, either black pipe correctly installed or
galvanized.
Today, for corrosion issues, plastic is now widely used underground.

Over the years gas companies have looked at ALL the issues, including
not only what the pipe is carrying, but where it is being used. The
only
potential problem with galvanized that I've ever seen documented in
any way is that which DPB brought up, which is the
concern that certain impurities in the gas could lead to the zinc
flaking
off and ultimately clogging orifices, etc. I don't believe it was
ever
an issue of the pipe failing, leaking, etc. If galvanic corrosion
were a
real issue with gas pipe in an application inside a house, the gas
companies that allow it would be pretty stupid, no? As would the fire
rating, safety, insurance companies, etc.
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Default Can galvanized fittings be used with black iron pipe?

On 1/23/2011 2:24 AM, DD_BobK wrote:
On Jan 21, 9:19 pm, wrote:
Was at Lowes tonight picking up stuff for hooking up my HW heater this
weekend and found out they did not have anymore 1/2" Tee's in black
iron for my gas line. But they had galvanized 1/2" Tee's.
Can I mix the 2?


I asked this question of my mechanical engineering mentor nearly ~35
years ago.
He's long gone& I have mixed installations that has been in service
for over 30 years.

He's comment to me back in the 70's was........

"The myth that natural gas causes galvanizing to flake off is an old
wives tale that has debunked by testing, go ahead and use it"

Here is a link to pretty detailed thread on the subject, including
cites from the IRC.

http://www4.iccsafe.org/cgi-bin/ulti...c;f=2;t=002632

a couple guys go back& forth but I'm putting my money on the IRC,
posts in the cited thread by dsjtecserv& my mentor.
He had YEARS of industrial mechanical engineering experience,
including being the chief engineer on design& construction of a
natural gas to fertilizer plant.

YMMV but has been pretty good so far

cheers
Bob

Well, when I was a kid in the 50s and 60s, someone told me that
black iron pipe is used for gas because, when tightening a joint,
the pipes grind into one another making a tighter seal. I don't
know one way or another .... that's just what I was told. I've
heard all the other "tales". The gas (propane) in my new house is
neither. It's a corrugated flex line, covered with yellow plasticy
rubbery stuff ... looks like yellow heat shrink tubing.
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Default Can galvanized fittings be used with black iron pipe?

On 1/22/2011 8:56 PM, RicodJour wrote:
On Jan 22, 8:18 pm, David wrote:
On 1/22/2011 3:38 PM Bob F spake thus:

My understanding is that sulphur or something in some gas can cause problems
with galvanized piping, so if the local supply has it, galvanized may not be
allowed. Part of the problem may relate to the zinc flaking off the iron, and
plugging orifaces. The drop tube below the "T" to the burner is there to catch
such debris, I believe.


Y'know, this business of how gas might *possibly* cause the coating to
"flake off" of galvanized piping has been brought up several times in
this thread. But nobody has provided any evidence for this, not even
anecdotal. Certainly no articles in scientific journals or the like.


I've been looking for more information as well, and I have to agree
with you. There's a lot of conjecture and a lot of argument about
it. Like I've said, this topic starts wars. Maybe it's like a
plumbing WMD - wars with no foundation!

So until I see such evidence, I'm going to write this off as basically
urban legend, from the dim, dark past of gas companies who didn't really
know *what* was happening.

But I still use black pipe only on gas, just from force of habit ...


I recently replaced part of the 1.5" black iron condensate return line
on our one-pipe steam system. The pipe was original to the house and
about 80 years old. A few years back we had a leak on, you guessed
it, the night before Christmas Eve. It had rusted through at the
first vertical to horizontal transition on its return run. The
outside of the pipe was quite rusted in places, and, because of that
leak, I figured the pipe was just about done and I wasn't going to
wait for another leak. When I busted off the first fitting and
removed that first section of pipe, I was quite surprised to see the
condition of the inside of the pipe. It looked almost new. There was
a thin, uniform black layer coating the inside, and other than that
was remarkably clean. There was no rust in the pipe or the fittings.
The fitting that leaked was buried inside a wall just about the
basement slab and had rusted from the outside in. The old concrete
foundation wall had been compromised by water intrustion over the
years and what was essentially sand had buried the pipe and kept the
outside of the pipe wet enough to rust at an accelerated rate, but
there wasn't enough water coming through the foundation to show up
inside the living space.

I discovered some new-found respect for black iron pipe from that
abbreviated replace-it-all project attempt - there was no need. In
the same or less time, galvanized pipe of the same size has had to be
replaced at several places in the house. This is backwards to what
everybody 'knows' -galvanized pipe will last longer than black iron -
but I've seen it firsthand. I still don't tell people to go against
code and buy the cheaper black iron pipe if code calls for
galvanized. When I replaced the section of pipe I had cut out, I
replaced it with black iron. I'll let you know in 80 years how it's
held up.

The codes around here are messed up. Until very recently there was
one nearby village that required 3/4" plywood sheathing on the walls
and roof, cast iron subsurface rainwater drainage lines, BX electrical
cable (say what?!), two layers of 1/2" drywall laid at right angles
with both layers taped, and slate roofs. Only when the prices of
things got so ridiculous, and the homeowner's started listening to the
contractors telling them that the code did not benefit them in any way
and only wasted large amounts of money, did the village start
modifying their code.

But who tells a gas company what to do?

R

Maybe 5 years ago there was a strong smell of gas outside. The source
was where the (cracked) plastic coated now rusted through black pipe
emerged from the ground into the valve.

I called the gas company and they were there within minutes. There were
at least 6 trucks (including one with a backhoe on a trailer) from the
gas company out on the street. I asked what that was about and he said
everyone who hears the radio broadcast of a gas leak that is nearby
needs to drop what they are doing and head to the location. That is
because they got dinged a few months back during a structure fire when
it took them hours to respond.

They have a specific prohibition against galvanized pipe. The foreman
said they would replace everything on the outside. They ran a new
plastic lateral from the street. Another guy carried in a complete new
riser, valve, regulator and meter saddle assembly. The line side had a
90 degree long sweep *galvanized steel* elbow. The plastic adapter was
attached on one side and the shutoff on the other side.

Gas companies seem to have their own tradition about being impossible to
deal with. I own some rentals. The current gas company is a huge
outfit. They purchased the regional provider that served our area. One
tenant announced they were moving out so something told me to call the
gas company and verify that the service would transfer to my name as it
did previously. I called and they said they did not know who I was. I
provided them with the meter numbers and the accounts that were
generated on previous occasions. I also provided them with the account
for our house. They said since they didn't know me I would need to fill
out some form and fax (who uses fax) it to them. They said it would take
two weeks to process? I asked if I could stop by their office and they
said they no longer had offices open to the public. I asked if I could
fill out the form on their web site and they said they don't have that
available. Since the tenant was moving out in a few days I persisted and
ended up talking to some VP who insisted it was the fault of the
customer service person who answered my call.

I asked him to describe what authority the customer service person had
to solve the problem and he said they had none. I then suggested he
needed to look in the mirror if he wanted to see the problem.




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Default Can galvanized fittings be used with black iron pipe?

On Jan 23, 7:48 am, wrote:

To the above I would add that the comparison to the boat use of zinc
as a
sacrificial anode is invalid, unless the pipe in question is being
used in
an environment where it's EXPOSED TO AN ELECTROLYTE. The
electrolyte essentially completes a circuit that allows current to
flow. In
the case of boats, that electrolyte is water, or even worse, salt
water.
With the boat, you have sacraficial zinc plates electrically bonded to
the
underwater metal parts, ie shafts, props, struts, etc. The circuit
looks
like two different metals, ie bronze and zinc, sitting in a beaker of
salt
water. Very similar to the experiment kids can do, using a lemon, a
dime, and a penny to make a battery. As the current flow, the zinc
erodes and slowly disappears.

With galvanized pipe installed on a gas line indoors, you don't have
an
electrolyte. If it were buried, then you could have an issue. But
buried
you have an issue with black steel too. I think it's still being
allowed in
some areas. But it's supposed to be coated and or wrapped with tape
to prevent corrosion. A process that is far from perfect. I've
seen
black steel pipe fail underground in as little as five years. It
looked
like swiss cheese, hard to believe. But it was obvious what had
ocurred. You could see where the installers had used black pipe and
then poured the tar like coating over the top of it after it was
installed
in the trench. The bottom portion did not get coated and that is
where the failure ocurrred. I remember at the time, mid 90s, we had
the gas company involved in recommending what to do at a 120
unit condo. At that time even they were undecided which was better
for that application, either black pipe correctly installed or
galvanized.
Today, for corrosion issues, plastic is now widely used underground.

Over the years gas companies have looked at ALL the issues, including
not only what the pipe is carrying, but where it is being used. The
only
potential problem with galvanized that I've ever seen documented in
any way is that which DPB brought up, which is the
concern that certain impurities in the gas could lead to the zinc
flaking
off and ultimately clogging orifices, etc. I don't believe it was
ever
an issue of the pipe failing, leaking, etc. If galvanic corrosion
were a
real issue with gas pipe in an application inside a house, the gas
companies that allow it would be pretty stupid, no? As would the fire
rating, safety, insurance companies, etc.


I can not argue with any of that, even though it does poke large holes
in my argument.
On the plus side - I did get to get in a nice plug for the marine
industry.

We've agreed on the following:
- that the IRC and many other codes allow mixing galvanized and black
iron pipe in distribution lines
- that there is little likelihood of there being any problems by doing
so
- that some local codes and gas utilities prohibit using galvanized
pipe
- that it is mandatory that people contemplating using galvanized pipe
in gas installations check with their gas utility and/or local code to
see if it is permitted.

Now, how do we erase all of the extraneous back-and-forth on the topic
on the Internet so people will have a clear, simple grasp of the
issues?

R
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Default Can galvanized fittings be used with black iron pipe?

On 1/23/2011 9:27 AM, RicodJour wrote:
On Jan 23, 7:48 am, wrote:

To the above I would add that the comparison to the boat use of zinc
as a
sacrificial anode is invalid, unless the pipe in question is being
used in
an environment where it's EXPOSED TO AN ELECTROLYTE. The
electrolyte essentially completes a circuit that allows current to
flow. In
the case of boats, that electrolyte is water, or even worse, salt
water.
With the boat, you have sacraficial zinc plates electrically bonded to
the
underwater metal parts, ie shafts, props, struts, etc. The circuit
looks
like two different metals, ie bronze and zinc, sitting in a beaker of
salt
water. Very similar to the experiment kids can do, using a lemon, a
dime, and a penny to make a battery. As the current flow, the zinc
erodes and slowly disappears.

With galvanized pipe installed on a gas line indoors, you don't have
an
electrolyte. If it were buried, then you could have an issue. But
buried
you have an issue with black steel too. I think it's still being
allowed in
some areas. But it's supposed to be coated and or wrapped with tape
to prevent corrosion. A process that is far from perfect. I've
seen
black steel pipe fail underground in as little as five years. It
looked
like swiss cheese, hard to believe. But it was obvious what had
ocurred. You could see where the installers had used black pipe and
then poured the tar like coating over the top of it after it was
installed
in the trench. The bottom portion did not get coated and that is
where the failure ocurrred. I remember at the time, mid 90s, we had
the gas company involved in recommending what to do at a 120
unit condo. At that time even they were undecided which was better
for that application, either black pipe correctly installed or
galvanized.
Today, for corrosion issues, plastic is now widely used underground.

Over the years gas companies have looked at ALL the issues, including
not only what the pipe is carrying, but where it is being used. The
only
potential problem with galvanized that I've ever seen documented in
any way is that which DPB brought up, which is the
concern that certain impurities in the gas could lead to the zinc
flaking
off and ultimately clogging orifices, etc. I don't believe it was
ever
an issue of the pipe failing, leaking, etc. If galvanic corrosion
were a
real issue with gas pipe in an application inside a house, the gas
companies that allow it would be pretty stupid, no? As would the fire
rating, safety, insurance companies, etc.


I can not argue with any of that, even though it does poke large holes
in my argument.
On the plus side - I did get to get in a nice plug for the marine
industry.

We've agreed on the following:
- that the IRC and many other codes allow mixing galvanized and black
iron pipe in distribution lines
- that there is little likelihood of there being any problems by doing
so
- that some local codes and gas utilities prohibit using galvanized
pipe
- that it is mandatory that people contemplating using galvanized pipe
in gas installations check with their gas utility and/or local code to
see if it is permitted.

Now, how do we erase all of the extraneous back-and-forth on the topic
on the Internet so people will have a clear, simple grasp of the
issues?

R


How can something so simple become so complex? :-)

TDD
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Default Can galvanized fittings be used with black iron pipe?

On Jan 23, 10:29*am, The Daring Dufas
wrote:
On 1/23/2011 9:27 AM, RicodJour wrote:

We've agreed on the following:
- that the IRC and many other codes allow mixing galvanized and black
iron pipe in distribution lines
- that there is little likelihood of there being any problems by doing
so
- that some local codes and gas utilities prohibit using galvanized
pipe
- that it is mandatory that people contemplating using galvanized pipe
in gas installations check with their gas utility and/or local code to
see if it is permitted.


Now, how do we erase all of the extraneous back-and-forth on the topic
on the Internet so people will have a clear, simple grasp of the
issues?



How can something so simple become so complex? :-)


Human nature...? Just bring up the subject of helmets on a cycling
newsgroup. Everyone is 100% right, adamant about it, and nobody
agrees.

R
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Default Can galvanized fittings be used with black iron pipe?

The Daring Dufas wrote:
On 1/23/2011 9:27 AM, RicodJour wrote:
On Jan 23, 7:48 am, wrote:
To the above I would add that the comparison to the boat use of zinc
as a
sacrificial anode is invalid, unless the pipe in question is being
used in
an environment where it's EXPOSED TO AN ELECTROLYTE. The
electrolyte essentially completes a circuit that allows current to
flow. In
the case of boats, that electrolyte is water, or even worse, salt
water.
With the boat, you have sacraficial zinc plates electrically bonded to
the
underwater metal parts, ie shafts, props, struts, etc. The circuit
looks
like two different metals, ie bronze and zinc, sitting in a beaker of
salt
water. Very similar to the experiment kids can do, using a lemon, a
dime, and a penny to make a battery. As the current flow, the zinc
erodes and slowly disappears.

With galvanized pipe installed on a gas line indoors, you don't have
an
electrolyte. If it were buried, then you could have an issue. But
buried
you have an issue with black steel too. I think it's still being
allowed in
some areas. But it's supposed to be coated and or wrapped with tape
to prevent corrosion. A process that is far from perfect. I've
seen
black steel pipe fail underground in as little as five years. It
looked
like swiss cheese, hard to believe. But it was obvious what had
ocurred. You could see where the installers had used black pipe and
then poured the tar like coating over the top of it after it was
installed
in the trench. The bottom portion did not get coated and that is
where the failure ocurrred. I remember at the time, mid 90s, we had
the gas company involved in recommending what to do at a 120
unit condo. At that time even they were undecided which was better
for that application, either black pipe correctly installed or
galvanized.
Today, for corrosion issues, plastic is now widely used underground.

Over the years gas companies have looked at ALL the issues, including
not only what the pipe is carrying, but where it is being used. The
only
potential problem with galvanized that I've ever seen documented in
any way is that which DPB brought up, which is the
concern that certain impurities in the gas could lead to the zinc
flaking
off and ultimately clogging orifices, etc. I don't believe it was
ever
an issue of the pipe failing, leaking, etc. If galvanic corrosion
were a
real issue with gas pipe in an application inside a house, the gas
companies that allow it would be pretty stupid, no? As would the fire
rating, safety, insurance companies, etc.

I can not argue with any of that, even though it does poke large holes
in my argument.
On the plus side - I did get to get in a nice plug for the marine
industry.

We've agreed on the following:
- that the IRC and many other codes allow mixing galvanized and black
iron pipe in distribution lines
- that there is little likelihood of there being any problems by doing
so
- that some local codes and gas utilities prohibit using galvanized
pipe
- that it is mandatory that people contemplating using galvanized pipe
in gas installations check with their gas utility and/or local code to
see if it is permitted.

Now, how do we erase all of the extraneous back-and-forth on the topic
on the Internet so people will have a clear, simple grasp of the
issues?

R


How can something so simple become so complex? :-)

TDD

People from different states/countries each talking about
a zillion different sets of rules?
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Default Can galvanized fittings be used with black iron pipe?

On Sat, 22 Jan 2011 21:22:14 -0800 (PST), Harry K
wrote:

On Jan 21, 10:59Â*pm, David Nebenzahl wrote:
On 1/21/2011 9:58 PM RicodJour spake thus:

I would not mix galvanized and black iron directly, even if it's
allowed, as that accelerates corrosion. Â*You'd have to use a
dielectric fitting.


Now *that* makes my BS meter twitch just a mite: why would there be
corrosion? Galvanized pipe is zinc over steel, so galvanized + steel
(black) should be no problem, right?

--
Comment on quaint Usenet customs, from Usenet:

Â* Â*To me, the *plonk...* reminds me of the old man at the public hearing
Â* Â*who stands to make his point, then removes his hearing aid as a sign
Â* Â*that he is not going to hear any rebuttals.


To add to that. The "zinc" on the galvanised never touches the "black
iron". Threading removes the zinc plating in that area and the
fittings never screw together far enough for the zinc to touch the
unplated pipe/fitting.

Harry K

More or less true - but "some" galvanized fittings appear to have
zinc in the female threaded portion.
Not with hot dip galvanizing, for sure - but in "bright zinc"
"galvanizing".

This does not change the fact that the zinc is NOT a corrosion risk.


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Default Can galvanized fittings be used with black iron pipe?

On Jan 23, 7:27*am, RicodJour wrote:
On Jan 23, 7:48 am, wrote:











To the above I would add that the comparison to the boat use of zinc
as a
sacrificial anode is invalid, unless the pipe in question is being
used in
an environment where it's EXPOSED TO AN ELECTROLYTE. * The
electrolyte essentially completes a circuit that allows current to
flow. *In
the case of boats, that electrolyte is water, or even worse, salt
water.
With the boat, you have sacraficial zinc plates electrically bonded to
the
underwater metal parts, ie shafts, props, struts, etc. * The circuit
looks
like two different metals, ie bronze and zinc, sitting in a beaker of
salt
water. * Very similar to the experiment kids can do, using a lemon, a
dime, and a penny to make a battery. *As the current flow, the zinc
erodes and slowly disappears.


With galvanized pipe installed on a gas line indoors, you don't have
an
electrolyte. * If it were buried, then you could have an issue. *But
buried
you have an issue with black steel too. *I think it's still being
allowed in
some areas. *But it's supposed to be coated and or wrapped with tape
to prevent corrosion. * A process that is far from perfect. * I've
seen
black steel pipe fail underground in as little as five years. *It
looked
like swiss cheese, hard to believe. * But it was obvious what had
ocurred. * You could see where the installers had used black pipe and
then poured the tar like coating over the top of it after it was
installed
in the trench. * The bottom portion did not get coated and that is
where the failure ocurrred. * I remember at the time, mid 90s, we had
the gas company involved in recommending what to do at a 120
unit condo. * At that time even they were undecided which was better
*for that application, either black pipe correctly installed or
galvanized.
* Today, for corrosion issues, plastic is now widely used underground..


Over the years gas companies have looked at ALL the issues, including
not only what the pipe is carrying, but where it is being used. * The
only
potential problem with galvanized that I've ever seen documented in
any way is that which DPB brought up, which is the
concern that certain impurities in the gas could lead to the zinc
flaking
off and ultimately clogging orifices, etc. * I don't believe it was
ever
an issue of the pipe failing, leaking, etc. * If galvanic corrosion
were a
real issue with gas pipe in an application inside a house, the gas
companies that allow it would be pretty stupid, no? *As would the fire
rating, safety, insurance companies, etc.


I can not argue with any of that, even though it does poke large holes
in my argument.
On the plus side - I did get to get in a nice plug for the marine
industry. *

We've agreed on the following:
- that the IRC and many other codes allow mixing galvanized and black
iron pipe in distribution lines
- that there is little likelihood of there being any problems by doing
so
- that some local codes and gas utilities prohibit using galvanized
pipe
- that it is mandatory that people contemplating using galvanized pipe
in gas installations check with their gas utility and/or local code to
see if it is permitted.

Now, how do we erase all of the extraneous back-and-forth on the topic
on the Internet so people will have a clear, simple grasp of the
issues?

R


Use Google. Erase.......

it is similar to Google.Takeback (what you use when you want retrieve
an email or posting that you wish you hadn't sent.)

cheers
Bob
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Default Can galvanized fittings be used with black iron pipe?

DD_BobK wrote:
....

Now, how do we erase all of the extraneous back-and-forth on the topic
on the Internet so people will have a clear, simple grasp of the
issues?

R


Use Google. Erase.......

it is similar to Google.Takeback (what you use when you want retrieve
an email or posting that you wish you hadn't sent.)

....

Can't help; once a posting hits usenet, it's gone. Virtually no servers
honor cancel messages.

--
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Default Can galvanized fittings be used with black iron pipe?

On Jan 23, 3:37*pm, DD_BobK wrote:
On Jan 23, 7:27*am, RicodJour wrote:

Now, how do we erase all of the extraneous back-and-forth on the topic
on the Internet so people will have a clear, simple grasp of the
issues?



Use Google. Erase.......

it is similar to Google.Takeback (what you use when you want retrieve
an email or posting that you wish you hadn't sent.)


Would that it were so. That only works with Google posting, right?
I'm talking about all of the forums and sources out there where this
topic comes up repeatedly and the same information gets batted about.
Since we've 'solved' it, we should save other people from having to
wade through the extraneous and misleading information. Maybe post a
Wikipedia article and just point back to that whenever it comes up
here? Post the Wiki link on those other forums?

R
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Default Can galvanized fittings be used with black iron pipe?

On Jan 23, 5:50*pm, Oren wrote:

To much zinc in the making of *brass might cause a brass fitting (PEX
connector) to leak.


Why in the world would the Chinese use too much zinc in the copper
alloy? That would be unethical and greedy. Could never happen.

R


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On 1/23/2011 7:27 AM RicodJour spake thus:

[massive snipola]

Now, how do we erase all of the extraneous back-and-forth on the topic
on the Internet so people will have a clear, simple grasp of the
issues?


Like they say, good luck with that!


--
Comment on quaint Usenet customs, from Usenet:

To me, the *plonk...* reminds me of the old man at the public hearing
who stands to make his point, then removes his hearing aid as a sign
that he is not going to hear any rebuttals.
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Default Can galvanized fittings be used with black iron pipe?

On 1/23/2011 5:39 AM Art Todesco spake thus:

On 1/23/2011 2:24 AM, DD_BobK wrote:

On Jan 21, 9:19 pm, wrote:

Was at Lowes tonight picking up stuff for hooking up my HW heater
this weekend and found out they did not have anymore 1/2" Tee's
in black iron for my gas line. But they had galvanized 1/2"
Tee's. Can I mix the 2?


I asked this question of my mechanical engineering mentor nearly
~35 years ago. He's long gone& I have mixed installations that has
been in service for over 30 years.

He's comment to me back in the 70's was........

"The myth that natural gas causes galvanizing to flake off is an
old wives tale that has debunked by testing, go ahead and use it"

Here is a link to pretty detailed thread on the subject, including
cites from the IRC.

http://www4.iccsafe.org/cgi-bin/ulti...c;f=2;t=002632

a couple guys go back& forth but I'm putting my money on the IRC,
posts in the cited thread by dsjtecserv& my mentor. He had YEARS
of industrial mechanical engineering experience, including being
the chief engineer on design& construction of a natural gas to
fertilizer plant.

YMMV but has been pretty good so far


Well, when I was a kid in the 50s and 60s, someone told me that
black iron pipe is used for gas because, when tightening a joint,
the pipes grind into one another making a tighter seal. I don't
know one way or another .... that's just what I was told. I've
heard all the other "tales".


What you heard was essentially correct. When you tighten a pipe fitting
with any kind of metal pipe--black iron, galvanized, brass, bronze,
etc., both threads deform--in other words, get squished--enough to
remove almost all gaps between them. That's how pipes get sealed. (What
few microscopic gaps may be left are filled by Teflon tape or pipe
thread compound.)


--
Comment on quaint Usenet customs, from Usenet:

To me, the *plonk...* reminds me of the old man at the public hearing
who stands to make his point, then removes his hearing aid as a sign
that he is not going to hear any rebuttals.
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Best laugh I've had in a long time. Thanks.

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


"RicodJour" wrote in message
...
On Jan 23, 5:50 pm, Oren wrote:

To much zinc in the making of brass might cause a brass
fitting (PEX
connector) to leak.


Why in the world would the Chinese use too much zinc in the
copper
alloy? That would be unethical and greedy. Could never
happen.

R


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Default Can galvanized fittings be used with black iron pipe?

On 1/23/2011 6:26 PM, RicodJour wrote:
On Jan 23, 5:50 pm, wrote:

To much zinc in the making of brass might cause a brass fitting (PEX
connector) to leak.


Why in the world would the Chinese use too much zinc in the copper
alloy? That would be unethical and greedy. Could never happen.

R

So that people who want cheap stuff will have things to buy?
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Default Can galvanized fittings be used with black iron pipe?

replying to David Nebenzahl, villiewe wrote:
Simple: I assumed the black iron was so you could tell which lines were gas
while galvanized was water.
When I had this house inspected 41 years ago before buying, he suggested I ask
the owner was was the purpose of the galvanized iron going to the attic! I
paid him anyway!

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