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ahmedwahba
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Join Date: Feb 2009
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need a help

02/28/2009 6:52 PM

hello sirs,

first of all thanks for this great website that gives us the ability to chare our proplems to find the sloutions and i hope one can help me , my question also is very intersted and hope every one check the answer of this question ,

my question is what is the effect of the tranmission lines in the gas pipe line and also what is the effect in suddenly short circuit in the gas pipe line systems and also in the cathodic protection system at the pipe line ,

hope any one could help me on it

thanx
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sb
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#1

Re: need a help

02/28/2009 11:59 PM

what is a transmission line in a gas pipeline ?

If you transmit electricity through a gas pipeline as I understand (combustible gas) then the effect of the trnasmission itself, forget about the short circuit is .

No code permits this (what-ever country in the world) - In fact in my factory, the HSE does not permit the gas, water and electrical terminals on the same zone. Forget about carrying inside.

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AussieBob
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#2

Re: need a help

03/01/2009 4:46 AM
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sb
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#3
In reply to #2

Re: need a help

03/01/2009 5:32 AM

Is it a jelly fish ?

or it is a fish that makes jelly minced meat baked bacon burnt chop of others ?

I like this as a avatar. There are a lot without it ? I can not change as Bruce Willis said in Die hard - somebody Gremlins has to do it.

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Lspraba
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#4
In reply to #2

Re: need a help

03/01/2009 4:01 PM

G.A
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Lspraba
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#5

Re: need a help

03/01/2009 4:07 PM

If electric transmission line kept inside the gas pipeline(other than oxygen), nothing would happen. Because oxygen is required for fire. Please check it and reply me.
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southern123
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#6
In reply to #5

Re: need a help

03/02/2009 8:50 AM

Please: give us an example of transmission line inside gas pipe.
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redfred
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#11
In reply to #5

Re: need a help

03/03/2009 11:37 AM

Actually, we use pure propane as the gas for some ion chamber radiation detectors. This involves high voltage power supplies and sensing electronics in one little box. In these chambers the propane is slightly above atmospheric pressure and a simple pressure switch turns off all high voltages when the propane starts to leak.

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Anonymous Poster
#13
In reply to #11

Re: need a help

03/04/2009 12:09 PM

Yes, during leakage there would be possibility of contact with atmosphere(oxygen).
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Anonymous Poster
#7

Re: need a help

03/02/2009 12:33 PM

I built utility substations for three years, and I never worked with or herd of transmission lines being installed in gas pipe lines.What I can tell you is thats not normal, and very unlikely of. I know if any gases are any were close to electrical equipment its considerd a hazardous location depending on the circumstanses. You should look in to it some more.
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StandardsGuy
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#8

Re: need a help

03/02/2009 8:21 PM

Hi ahmedwahba,

Welcome to CR4. Please tell us what country you are from, and if these questions apply to some form of chemical refinery. Like the rest, I can't imagine a cathodic protection in a gas pipe line, etc. Are you talking about RF communications inside a gas pipeline? Also the use of the green check-mark (spell checker) will make your posts more readable.

Regards,

S

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Anonymous Poster
#9
In reply to #8

Re: need a help

03/03/2009 9:31 AM

thanx my dear for your reply , i am from egypt , yes it should be have a cathodic portection in the gas piple line (applying cathodic protection at the gas pipe line to protect the pipe line from the corrosion ) i am not talking about the RF but i am talking about the power trasmission lines over the gas pipe line
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redfred
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#10

Re: need a help

03/03/2009 11:32 AM

The external transmission lines have minimal to no effect on the gas pipelines. If I grasp at some straws into the unexpected scenario list. The ground wire at the top of the transmission line, should have some mitigating effect on how likely lightning could damage the pipeline. Conversely, the lack of a good ground wire at the top of a transmission line, might make it more likely for a lightning strike.

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southern123
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#12
In reply to #10

Re: need a help

03/03/2009 7:13 PM

A Scenario:

Overhead electrical transmission line is over the pipeline, right?

One or more towers are grounded; grounding rods/electrodes are close to pipe constructions - assume metallic.

Lightning strikes are close to transmission line. Their high current inducts high voltages in line conductors. The enormous high charges then are discharged via tower grounding. Some, even small energy reaches pipe (metallic?). It must have value greater than the gas igniting value to be dangerous.

And if there is even a small leakage you will see picture from the answer # 2

A Question to readers: What is wrong here?
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Users who posted comments:

Anonymous Poster (3); AussieBob (1); Lspraba (2); redfred (2); sb (2); southern123 (2); StandardsGuy (1)

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