What attacks steel_pipes_borecasing_underground

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What Attacks Steel Casing ?


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In this article we will discuss some of the major enemies of steel pipe, which are laid underground and the ways to minimize it in the best possible way


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This can be in the form of Borecasing, Rising Main, Steel Column and Shaft


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There are 3 Main culprits.


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1: Stray Currents


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2: Total Dissolved Salts


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3: Ground Water Quality


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One of the major threats to underwater steel pipes are DC currents as well as AC currents which can also be termed as the stray currents.


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This is caused by immersion of steel pipes in a conductive medium.


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It basically happens when two different types of metals are in the ground


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Specially if there are at opposite ends on the Galvanic scale.


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Steel Column and casing in the ground has seen a noticeable difference in lifetime spans over the last 8 years


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In some areas we have seen the lifetime gone from 15 years plus, to 2 years or less


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Most of the stray currents which can be both AC andDC come from electrical wiring, that is laid underground or earthed in the ground.


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Most of the AC currents comes from the leakage from local power lines, this can be rectified by

the authorities.


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DC currents, the local catholic protection of the electric fencing etc, earthing should be Installed correctly to minimize stray current.


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This can be checked by a Standard Voltage and Amp meter.


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If you have a electric fence or telephone lines near your steel pipelines,


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then you are prone to lose almost 40 pounds or 18 kgs of steel annually by only 2 AMPs of DC current. That is why periodic check up by the local power authorities or a electrician must be done.


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Even sacrificial anode attached to the steel pipes, will make a difference.


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Now, the second biggest enemy of the steel pipes is the TDS(Total Dissolved Salts).


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If the concentration is above 700 ppm then the pipelines are prone to corrosion.


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TDS meters are easily available or you can have a water sample checked before laying pipelines or installation of casing and Column and periodically inspection is suggested.


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The higher the TDS, the higher will be the potential of corrosion taking place.


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The third problem with the steel pipes is the ground water, which is quite prone to the high bacterial concentration.


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The corrosive enzymes released by some of the bacteria present underground, increases the steel pipes corrosion by almost 250%.


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Most common type of bacteria are sulphate reducing as well as the Iron reducing bacteria.


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Both of them at humid conditions, help in a faster corrosion of the steel pipes.


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Other Prime causes are Iron Biofouling


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The most common way is to get the water checked and then apply a general alkaline solution to the outer perimeter of the pipes and even look at other solutions to this problem.


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The coli form count of the underground water is also one of the major problems that the urban

cities are facing.


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The E.Coli and the coli form count of the ground water must be checked periodically and therefore should be treated by alkaline solution and other disinfectants.


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You need to be aware of the potential dangers and take periodic checks of the TDS, PH, Stray current , the bacterial concentration and the ground water analysis and act according to the results urgently.


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How can I minimize this Problem?


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Check earth stakes are working and in good condition


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Check for Stray Voltages


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Neutralize water conditions


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Use Non Corrosive materials


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Similar metals on the galvanic scale

Thank you for taking the time to look at the information we have created for you,We hope this will be of assistance to solving your piping, drainage and drilling challenges.

If you have any more questionsPlease feel free to contact myself or one of our team


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For more Articles, Case Studies, How to and Information go to www.deps.com.au

then click onto Handy Linksor contact us on1300 133 000

[email protected]

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Date post:	19-May-2015
Category:	Business
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