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Samples - witnesses (coupons) for corrosion and scale control – NPF "Akrus-M", OOO | all.biz
Buy Samples - witnesses (coupons) for corrosion and scale control
Samples - witnesses (coupons) for corrosion and scale control

Samples - witnesses (coupons) for corrosion and scale control

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Products: Samples - witnesses (coupons) for the control of corrosion and scaling price buy manufacturer Russia, Republic of Bashkortostan


When monitoring corrosion by the gravimetric method, the so - called. witness samples or, as they are called abroad, coupons.

Samples are made, as a rule, of steel of the same grade as the steel of the pipeline, where the corrosion control unit is installed, or the same steel (usually steel 20) is used for all samples at the enterprise.

The second approach, in our opinion, is more practical, because allows you to obtain comparable results on the corrosiveness of media in relation to the same material. If you use different materials for samples, then there is an uncertainty which factor worked in a particular case, because black steels can differ in their corrosion resistance (according to our data, up to 3 times).

There is another objection to using steel of the same grade as pipeline steel. As shown by industrial tests carried out by our specialists on pipelines of the oil gathering system and water pipelines (in the same environments, at the same time) with different options "steel grade - pipe manufacturer", the corrosion rate even of the same steel grade of different factories can seriously differ from each other, despite the fact that both steels were produced according to the same regulatory documents. Thus, it is not only the steel grade that determines the metal's resistance to corrosion. An indisputable factor is also heat treatment, which may differ and, accordingly, the structure of steels will differ, which affects their corrosion resistance. There are other factors . . .

In this regard, it is more logical to use the same material for samples and, moreover, it should be purchased in the form of a large batch in order to minimize differences between the supplied witness samples. We adhere to this ideology, purchasing 20 steel in quantities sufficient to meet our own annual demand (about 6,000 samples per month) and third - party orders. At the same time, we can produce samples from any steel grades available on the market, as well as samples cut directly from the pipeline.

The main dimensions of the manufactured samples are as follows: cylindrical 14x11.1x9, 16x10x9, disk 28x11.1x3, flat 76.2x12.7x1.7, 80x20, 40x10x2 and others according to the customer's sizes. Specimens are also available for colonization with adherent bacteria, although any specimen can be used for this (flat is more convenient). For scaling control, flat witness samples are also used, which are made with holes of different diameters. By what size the salts are covered, the intensity of the precipitation of salts is determined.

LLC NPF "Akrus - M" is engaged in scientific and technical developments in the field of corrosion control, laboratory research and computer programs.

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Samples - witnesses (coupons) for corrosion and scale control
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