TCR ADVANCED ENGINEERING

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CORROSION EVALUATION

Corrosion is a silent killer of plant equipment, and is predominent in many forms. Some types of corrosion e.g. general thinning, pitting etc., can be detected in visual inspection. But there are other types e.g. Stress Corrosion Cracking (SCC), is not visible before any irreversible damage is done.

When Stainless Steel is subjected to a temperature more than 350 ºC (e.g welding); changes in its metallurgical status, makes it susceptible to SCC. This phenomenone is called SENSITIZATION. All the alloys used in equipment fabrication are not susceptible to SCC and are not sensitized; and all the chemical environments do not cause SCC, so it is necessary to evaluate, if any alloy may fail due to SCC.

There are international standards of tests which can detect the SCC susceptibility of an alloy. ASTM has devised a Standard: A-262. This standard has five different tests for variety of alloys, knows as Practice A, B, C, E & F.

ASTM A-262 Practice A:
Practice 'A' is also known as Oxalic Acid Etch Test. Using this practice preliminary judgement of sensitization can be made. Therefore, this test is sometimes called GO / NO GO test.

ASTM A-262 Practice C:
Practice 'C' is also known as Boiling Nitric Acid Test. The sample is subjected to 5 sets of 48 hours boiling nitric acid, and after each set, loss in weightis determined. An increasing trend of weight-loss is indicative of sensitizition. The sample having very low weight-loss in all the file sets is considered to be acceptable for fabrication.

TCR ADVANCED undertakes a wide range of corrosion and stress corrosion test per ASTM, DIN, or as per an individual client’s requirements. Experienced staff members are available to provide corrosion consulting, advice on corrosion prevention and corrosion control services including materials selection in laboratory or on-site inspection. TCR’s staff with specific industry expertise covers a variety of corrosion problems that are encountered in industries such as oil and gas production, oil and gas transmission, energy conversion systems, and nuclear power systems. The objective of the corrosion detection department at TCR is to provide quality service at a reasonable price and work with all clients as an extension of their QA team.

A wide variety of corrosion related tests can be undertaken at TCR ADVANCED to determine weight loss corrosion, intergranular attack, pitting corrosion, corrosion fatigue, stress corrosion cracking. The range of instruments available to perform these tests in unrivalled in our operating regions. Highly experienced and qualified engineers routinely undertake corrosion studies. We also carryout the tests under 3rd party inspection of LRS, TUV, DNV, ABS, BV and other inspection agencies.

LIST OF CORROSION TEST EQUIPMENTS
NAME OF INSTRUMENT	NO. OF SETS.
Full fledged set up and Erlen Meyer Apparatus for conducting Various IGC tests as per ASTM A – 262	9
Complete set up for conducting various tests as per ASTM A – 923 for pitting corrosion	6
Complete setup for conducting various tests as per ASTM G-48	6
Constant temperature bath range : 5 ºC to 80 ºC	6