S.I.G. Srl is a multi-service company whose personnel are engineers, chemists, architects and highly skilled technical staff.

Its main activity consists in assessing the corrosion damages and consequent stability of utility poles or public lighting in general.

Further fields of activity are corrosion analyses and non-destructive tests.

 

 

Assessment of corrosion on utility poles and its effect on their stability

 

This section is addressed to public administrations or companies that manage public or private utility poles or lighting systems.

 

The assessment of the state of public lighting poles, which includes tests for checking their degradation due to corrosion, aims above all to safeguard the health of people and secondly to avoid damages to objects or structures which could be caused as the result of meltdown.

Regular monitoring at a very low cost helps to guarantee safety requirements and leads to savings on facilities management, through the optimization of the type and frequency of maintenance operations. Corrosion testing and stability assessment carried out by skilled technicians, are aimed at optimizing the plant operation, thus assuring municipalities or companies that manage lighting systems that no meltdown will occur for the tested poles along a period of time depending on the results of the tests.

 

All utility poles which are 10 years or older must be checked in order to have a total vision of their conditions and to be able to plan replacements or immediate removals. In this way substantial economic savings can be made by replacing only those supports that are severely corroded and thus avoiding complaints due to damage to objects or people.

  

In Europe there are hundreds of millions of utility steel poles for public lighting. Their age ranges from a few days to more than fifty years. Many of them are deteriorated to the point that no one knows how long they can still support the service loads without falling. Although, statistically, the collapse of poles is not a very common event in relation to their number, the structural failures that occur and have occurred in Europe are more numerous than you might expect (see picture below). Such collapses have caused damage to objects and not infrequently to people, resulting in legal proceedings, claims and notoriety for the public administration.

The main cause of structural degradation of steel poles is corrosion by atmospheric agents such as:

·         water and moisture

·         acid gas (urban and/or industrial atmospheres)

·         chlorides (marine atmospheres, or from de-icing salts)

·         salts in the soil 

  

Often, other causes add to these factors, such as:

·         type of concrete

·         stray currents

·         galvanic coupling with different metals

 

The part of the utility pole that is mostly subject to corrosion is the interface between the buried portion and that part exposed to the atmosphere, which also happens to be the zone subject to the maximum static and dynamic loads. The main factors that trigger and sustain the corrosion process are water stagnation inside the bottom of the pole as well as water and moisture permeating through the pavement or concrete base as determined by meteorological parameters. The presence of gas dissolved in water, or other types of halide salts are accelerating factors.

 

The danger of corrosive attack lies in the fact that in most cases it is not visible to the naked eye, but develops below the protective sheath or in the buried part of the pole (in concrete or in soil). The monitoring of the corrosion state of the steel utility pole by non-destructive techniques, can prevent catastrophic events such as the collapse of the structure. It can allow the optimization of maintenance in terms of frequency and type of operation as well.

SIG srl has the methodology, skills and experience to assess the state of degradation of steel supports such as utility poles, advertising posters, pylons, high mast lighting poles, etc.. Our operating procedure involves visual inspection and technical examinations, to establish which type of action must be carried out on the pole:

·         no intervention (the pole is considered stable until next check)

·         substitution within a given deadline (the pole stability is not immediately at risk)

·         immediate removal (high risk of collapse)

 

The operational methodology used by SIG also allows you to calculate the residual life of the pole. After the first two checks an approximate value can be given which increases in accuracy whit the third and subsequent reviews.

  

Operating procedure

 

The tests that are performed on each pole are as follows:

1.    Visual inspection. A careful visual inspection of the state of the pole is performed. Each anomaly compared to original condition (scratches, dents, holes, visible corrosive attacks, accidental deformations, etc.) is marked down and photos of the relevant parts are taken.

2.    Corrosion potential measurement. A precision voltmeter is used to give electrochemical potential of the pole compared to a reference electrode which has a constant potential. The most common reference electrodes for these types of measures are: the copper/copper sulfate saturated electrode (Cu/CuSO4), by far the most used; the calomel saturated electrode (Hg/Hg2Cl2); the silver/silver chloride electrode (Ag/AgCl).

3.    Measurement of corrosion rate. A corrosion-meter is used which performs an electrochemical galvanic-dynamic technique with a three electrode system where the steel pole is the working electrode. The other two are a counter electrode of austenitic stainless steel (AISI 304) and a reference electrode. The device provides the corrosion rate given in microns per year.

4.    Measurement of residual thickness. It is performed by an ultrasonic thickness gauge. The measures are taken along the pole circumference at the four cardinal points (North, South, East, West) and at the four half-points.

 

On the basis of the overall results the decision is taken as to the necessary type of operation to be performed and a “pole certificate” is published.

  

 Replacement of the protective sheath at the base of the pole

 

SIG srl also provides installation or replacement of the sheath at the base of the pole. Sheaths are used of visco-elastic material, having highly protective properties. The notable sealant features of these sheaths make them particularly suitable for the protection of the base of the pole. They are able to prevent the penetration of water from the outside. They are applied easily and quickly, maintain their fluidity and so are easily removable if necessary. They do not require primer application, nor hardening or drying time. They do not contain toxic substances and are not harmful to the environment.

 

 High mast lighting poles

 

The section of high mast lighting poles describes the tests that S.I.G. S.r.l. makes for controlling the stability of such supports, which, due to their considerable weight and height require careful monitoring of stability.

 

 Steel towers for power transmission

 

In the steel lattice tower section, information is given on our assessment procedure. In this case the corrosion can create not only the possible fall of the frame, with possible damage to objects and people, but also an interruption of power distribution, creating economic damage and loss of image to the company.

 

 Corrosion analyses

 

SIG srl makes use of collaboration of highly qualified and experienced personnel in the field of corrosion analysis aimed at identifying the causes of the degradation processes of industrial plants, components, equipment, etc., and their remedies.

 

 Nondestructive Testing

 

SIG srl is able to carry out, on request, a number of non-destructive tests ranging from thermal imaging, magnetoscopy, X-ray fluorescence, etc.

 

 

 

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