There is a large difference between "been there seen them do it", and "this
is what I do for a living. A large part of our business is building gas
lines, big and small. Like I said, we weld gas lines from 3/4" to 36", 2 psi
to well over 1000.
As for 50 psi in a main, a natural gas distribution system can be fairly
complicated but the bone head version is this: The closer you get to the end
of a particular line, the lower the pressure and the smaller the pipe. So to
say a system runs at 50 psi is like saying my truck goes 50 mph, it does,
sometimes. Many times it doesn't. The pressure in a particular line will
vary at different times of the year, utilities bump it up come winter.
I'm not going to argue with you either, you seem to be the archtypical
internet expert, "I seen it done!" Good for you, but you are putting out
miss information and anyone working in this field knows it.
Nothing I have posted in this thread is false, I work around this stuff
nearly everyday, talk to the gents that do the work regularly.
Maybe they do things differantly around your neck of the woods!
I will not argue that fact that major, point ot point gas distribution is
still done in steel. Once you get to the city scale of things the prefered
pipe in this area is poly.
Funny, what you say is impossible I have seen with my own eyes!
I guess I was dreaming!
What do you do, exactly?
talk to the gents that do the work regularly.
We work from coast to coast.
I'm sorry, but every time you say something you display a lack of
understanding. What you just called distribution is transmittion.
Distribution is defined by the piping system downstream of the town station.
These are standard industry terms. Distribution piping is in town piping
Once you get to the city scale of things the prefered
Of course it is, it's cheaper, they use it in every case where it's legal to
use, the problem is that higher pressure piping is required in the system.
It is impossible, with todays materials, to build an entire distribution
system in plastic. Have you seen "with your own eyes" every underground
main, station and service in the system? Of course not, trust me, in your
area, if you are in the U.S., there are steel mains and steel services as
well as plastic.
You know, I never said steel was not ever used anymore, just that steel use
getting to be a thing of the past. Any low pressure, (less than ~100 psi),
small diameter, pipeing put in in many places is probably poly. Steel is
being used less and less. You won't see it much in our area.
The origination of all this B.S, was the supply side of a residential meter,
it would be poly in this area, as I am sure many others.
I just find it strange with your vast experiance you have never seen a poly
riser with a steel jacket as stated in one of your previous posts. Here is a
cut and paste from your earlier post.
I have never seen a steel riser to a meter in this area, They may exist, but
poly with a steel jacket is many times more common.
You made a statement that "All underground gas piping is either coated or
taped these days." Kind of a broad statement, isn't it? You Then you go on
later to admit to using poly for gas, which is it?
You ask what I do, I am a HVAC tech, and I do a ton of gas piping. Many
times I have seen the utility dig in gas supply for a home or bussiness.
EVERY time the tie in is to poly pipe. Some of the older parts of the city
may have steel under ground, but the preferance is poly in this area. I have
watched them bore and pull in poly gas main in new areas of the city many
times, not a bit of steel getting dug in for the city's distrubution.
I did watch them trench in a large transmission pipe this summer it was
steel. It was not a main to my understanding as it just got gas from point
"A" to "B", no branches going off. It was in the neighborhood of 12", but I
did not actually measure it.
I do not work in the gas industry, but a quick google revealed this
And looking down the page:
8. The distribution system consists of both high-pressure mains (less than
60 psig) and low-pressure mains (1/4 psig), which distribute gas from the
regulator station to the customer.
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com ).
Well, I live in rural PA and my main distribution line past my driveway
is 2" poly. It says so right on the yellow marker that sticks up out of
the ground by my driveway. I'll have to check, but I believe the line
from the main to my house is 1.5" poly.
I don't know what the pressure is, but I live out in the boonies and the
distribution lines are pretty long.
Anecdotal evidence about the line in front of your yard is interesting, but
I'm missing your point. There are millions of miles of plastic gas pipe in
the ground, I remember when they used regular old PVC, and I've seen all the
other incarnations of new and improved plastic line. When we test welders it
is a common sight to see a whole gaggle of guys taking the plastic welding
test. They use it everwhere they can, it's very cheap compared to welded
steel line. I would guess that hundreds of miles are put in the ground every
week, but that has no bearing on the fact that plastic at this point still
has serious limitations on use, and millions of miles of steel is used in
distribution piping as well.
Gas company just replaced all their pipe in our neighborhood this year. The
installers painted the pipes at the outdoor meter with utility gray Krylon
spray. They left a carton of six cans behind in my yard. Need some?
Rust prevention method:
This may be more than is needed, however, ......
Steel piping and structural steel beams may be effectively protected from
rust where there is air and water, high humidity, or water condensation
present by means of a block of zinc metal that is soldered or screwed to
the steel. Zinc blocks function as a part of an electric circuit in water.
the water on the surface completes the circuit. Instead of the oxygen in
the air or water combining with the steel it combines with the zinc metal.
Harmless zinc oxide powder is formed as the zinc is corroded away. The
steel remains un-rusted.
The zinc may be attached with a stainless steel screw to the steel, and the
zinc-to-steel contact patch must be clean metal to metal. The zinc and a
small patch of steel around or near to the zinc is left bare metal.
Zinc is used on auto body panels and on steel hull boats or boats that have
steel parts, e.g., prop shafts, that are in the water. The zinc blocks are
replaced from time to time.
Purchase the zinc blocks and fasteners from any boat accessory or boat
engine supply store. Several shapes are offered, e.g., disks or blocks.
Notice that anti-rust primer paints contain zinc. In water and oxygen when
the zinc in the paint is used up the finish will fail and rusting will
occur. A coating that totally seals the steel surfaces from water and
oxygen will prevent the establishment of the electric circuit and rusting.
Other metals will work, e.g., window frame aluminum in contact with steel,
and the aluminum will be the sacrificial metal. Check the electromotive
series in a chemistry book for a list of the metals that will work and that
will not work. Use the wrong metal and the steel will be sacrificed by
means of more rapid rusting.
The gas company might take a dim view of you screwing or soldering onto the
Gas distribution (and all other underground pipeline companies) companies
spend considerable time/money on cathodic protection. Small amounts of
electricity is run through pipelines, whenever a new service, or main
extension, or any other significant addition or subtraction is made to the
piping system they will take readings between the pipe and adjacent damp
soil, and add large cathodic blocks as needed to bring the readings into
their allowable range.
Zinc blocks function as a part of an electric circuit in water.
You are right: When writing I was focusing more upon fastening a block to
the web of a WF beam than to the gas pipe. Clamping the block to the pipe
would be appropriate. The same technique would work for steel or iron pipes.
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