Placement of Insulating Joint in pipeline changing medium from soil to air

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Mahanagar Gas

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Nov 22, 2016, 1:32:40 AM11/22/16
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This is with reference to Insulating Joint being installed on Steel pipelines to isolate the aboveground section from the underground section. I needed to know what is the advisable position for installing the same? Should IJs be installed aboveground or is it OK if the same is buried below ground? Also our current practise is we provide Cathodic protection to the underground portion and the portion above the IJ is ideally protected by painting. In some cases the portion above the buried IJ is also coated till the point it comes aboveground. Please provide me with suggestion / recommendations regarding the same.

 

For some IJs we have started exposing the IJs and keeping it exposed in a chamber & filling it with sand. Is this a viable solution? Please advise

Lakshman Kumar B

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Nov 22, 2016, 6:51:22 AM11/22/16
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Hi,

 

To the best of my knowledge and my practice that IJ’s are always to be installed just above ground.

Means – where the pipe came out from the UG – after that we have to place the IJ, and IJ is visible and accessible.

Based on the environment, utilized hardware, and situation we may do painting or not…

 

 

Thanks & Regards,

Lakshman Kumar B,

+91 9440031459.

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JIJILAL K M

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Nov 22, 2016, 10:58:21 PM11/22/16
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Dear Associates,
Please see the image of NG line IJ installed in my project.

On Nov 22, 2016 6:51 PM, "Lakshman Kumar B" <lakshma...@gmail.com> wrote:

Hi,

 

To the best of my knowledge and my practice that IJ’s are always to be installed just above ground.

Means – where the pipe came out from the UG – after that we have to place the IJ, and IJ is visible and accessible.

Based on the environment, utilized hardware, and situation we may do painting or not…

 

 

Thanks & Regards,

Lakshman Kumar B,

+91 9440031459.

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Mahanagar Gas
Sent: Tuesday, November 22, 2016 12:02 PM
To: Materials & Welding <materials-welding@googlegroups.com>
Subject: [MW:25751] Placement of Insulating Joint in pipeline changing medium from soil to air

 

This is with reference to Insulating Joint being installed on Steel pipelines to isolate the aboveground section from the underground section. I needed to know what is the advisable position for installing the same? Should IJs be installed aboveground or is it OK if the same is buried below ground? Also our current practise is we provide Cathodic protection to the underground portion and the portion above the IJ is ideally protected by painting. In some cases the portion above the buried IJ is also coated till the point it comes aboveground. Please provide me with suggestion / recommendations regarding the same.

 

For some IJs we have started exposing the IJs and keeping it exposed in a chamber & filling it with sand. Is this a viable solution? Please advise

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Ghanshyam Shukla

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Dec 4, 2016, 10:13:46 PM12/4/16
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what is the advisable position for installing the same?  

Both , it depends project requirement

 Should IJs be installed aboveground ?

Yes , Painting Class will changed

same is buried below ground?

Yes , Painting Class will changed

Also our current practise is we provide Cathodic protection to the underground portion and the portion above the IJ is ideally protected by painting ?

Your understanding is correct.


Also thickness of IJ Also consider.

Whether you consider ?

ghanshaym shukla

966543763514

On Tue, Nov 22, 2016 at 9:31 AM, Mahanagar Gas <sneha.d...@gmail.com> wrote:

This is with reference to Insulating Joint being installed on Steel pipelines to isolate the aboveground section from the underground section. I needed to know what is the advisable position for installing the same? Should IJs be installed aboveground or is it OK if the same is buried below ground? Also our current practise is we provide Cathodic protection to the underground portion and the portion above the IJ is ideally protected by painting. In some cases the portion above the buried IJ is also coated till the point it comes aboveground. Please provide me with suggestion / recommendations regarding the same.

 

For some IJs we have started exposing the IJs and keeping it exposed in a chamber & filling it with sand. Is this a viable solution? Please advise

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joydev dalai

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Dec 5, 2016, 10:07:06 PM12/5/16
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Dear Sir/Madam,

IJ shall be installed on above ground. The basic principal for using the IJ is - 

1) In under ground pipeline for PCP system the input voltage 220 V current. But in above ground , all the instrument are operate in mili volt. The main function of IJ is protect the voltage form under ground to above ground. Its act as a resistance.

2) The sparkarestor are installed with IJ. So it should be installed at above ground.


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Best Regards,

Joydev Dalai
Dy. Manager - QA/QC
JHPL Project,
Kalpataru Power Transmission ltd.

Lakshman Kumar B

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Dec 6, 2016, 1:12:13 AM12/6/16
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Hi – pls correct it, it’s not 220 V
it’s hardly 50 V DC

 

Thanks & Regards,

Lakshman Kumar B,

+91 9440031459.

 

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Best Regards,


Joydev Dalai

Dy. Manager - QA/QC

JHPL Project,

Kalpataru Power Transmission ltd.

 

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Ahmed Husain

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Dec 9, 2016, 9:25:02 PM12/9/16
to material...@googlegroups.com, Mahanagar Gas
Hi,

Purpose of installing the insulation kit is to isolate CP protected buried piping from non CP protected above ground piping, hence, this joint should be above ground. 
Regards,
Husain 


On Tue, 22 Nov, 2016 at 9:32 am, Mahanagar Gas

This is with reference to Insulating Joint being installed on Steel pipelines to isolate the aboveground section from the underground section. I needed to know what is the advisable position for installing the same? Should IJs be installed aboveground or is it OK if the same is buried below ground? Also our current practise is we provide Cathodic protection to the underground portion and the portion above the IJ is ideally protected by painting. In some cases the portion above the buried IJ is also coated till the point it comes aboveground. Please provide me with suggestion / recommendations regarding the same.

 

For some IJs we have started exposing the IJs and keeping it exposed in a chamber & filling it with sand. Is this a viable solution? Please advise

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