Saw the black pipe for water question, how about the other way around?
My house has some galvanized pipe used for gas. Have had some opinions
that the gas would corrode this pipe and only black is appropriate.
The city indicated that using galvanized for gas was not a code
An interesting article, but here is a question I've been thinking of:
Which is better for compressed air?
I would like to run a permanent line from a location where I would like
to run the compressor (for noise reasons) to another room for use.
Years ago, I used to work in a plastics molding plant and I seem to
recall that galvanized pipe was used for the compressed air lines, but
I thought I would throw the question out here to see what opinions there
"Never ascribe to malice what can equally be explained by incompetence."
For what ever it's worth, I have never seen galvanized pipe for air in a
commercial/industrial application. Not saying it does not exist, but plain
black pipe is more common.
I see no reason why you can not use either. Today's galvanized pipe is much
cleaner than years ago so flaking should not be a concern.
I was always told that black iron pipe
joints are "tighter" because the threads
into one another and that this doesn't
happen in galvanized pipe. Black iron was
supposed to be "softer" whatever that
means. As I said, this is what I heard.
never believed/understood it..
Greg O wrote:
You will find the iron black will weigh much more..LOL
Of course, I dont mess with it much anymore...still got my threaders and all
that good stuff, but now, stainless is the way to go..we recently did a 3
story instituion, 5 units, and had all the gas piping RAN, in under 4
hours..two guys. Thats secured, ran, and all we had to do was put fittings
on each end, and connect.
I like that stuff....black pipe, ran the same way, would have taken about 3
days for two men to do.
We don't do much rigid pipe any more either. The last couple large
commercial jobs we did all the NG in copper pipe using ProPress. We do some
boiler work so the ProPress comes in handy for that, then they came out with
fittings for gas, and the local inspector says if it is listed, go for it!
It is about even cost wise, but much faster.
We do a fair amount of SST, but on industrial, heavy commercial work the
inspector will not allow it.
Why wont your inspector allow it? Its certified in all lower 48 for use in
IF you want, ill pop you a mail with the local regional reps name, and he
will check into it, or put you in touch with someone that will, and get you
a definitive answer why.
We can use SST in commercial situations, office buildings, small warehouses,
that type of thing but not in a heavy equipment repair shop for example. No
big deal, we just use what we can, and bill accordingly!
Galvanized steel anything only implies a protective (zinc) coating over
the steel. Regardless of what the gas does to the coating, if
anything, I do not see why it should continue to eat away at the steel
after making its way through the coating? However, I have heard that
the zinc may cause a clog as it does corrode. I have experienced
clogged natural gas lines in the past so I know that this is not a
Hope this helps,
Years ago the stink additive reacted badly with galvanized pipe, so it was
forbidden for gas. However, so many people used galvanized anyhow that the
utilities changed their formulation so that galvanized was okay.
Around here anyhow. Check with your gas supplier and confirm it is okay
with them. Who cares if the town allows it if it will damage your furnace?
I would not worry about it. Our city follows International Mechanical Code.
I wish I had my code book handy so I could cite right out of the codes, but
the IMC requires gas pipe installed outdoors to be painted or to use
galvanized pipe. We have piped many large commercial jobs with galvanized
pipe, some jobs are hundreds of feet of pipe. Now granted, you are indoors,
but still it is no problem.
Call me chickens#!t, but I kinda thought the black pipe was softer, and
wouldn't spark nearly as easily, not that I remember ever seeing
galvanized spark. But someone will still try to attach a grounding wire
to it! Tom
[You're joking, right?]
This ain't your dick we're talking about <LOL>
(which is a completely different kind of pipe)
They're both the same pipe, it's just the coating. Zinc or black
(What is that black coating anyhow? Is it paint or what????)
This is Turtle.
Tom , They figured out what why the pipe weas sparking and it was not
being grounded by using teflon tape and not liquid teflon. The teflon
tape would not let the two pipes touch each other to comp-lete the
grounds. teflon tape is banded in moset refinerry plants in the oil
field. coating is the difference in the two pipes also.
On Wed, 16 Nov 2005 20:30:50 -0600, "Ken" <zab1116_at_yahoo.com>
....... Why dont you two guys just trade pipes .....
I believe that natural gas used to corrode zink and thus clog orfices.
I think that has been corrected. Propane can use any steel or copper
The main reason for black pipe on gas is for easy identification. A
can of black spray paint wont hurt anything and keeps black pipes from
rusting in damp areas too.
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.