For months now, there has been talk about the growing problem of hexavalent chromium formation on insulated structures in industrial plants.
Why has there been a debate on this issue?
Because this compound, resulting from thermochemical reactions among metal alloys containing chromium and oxides in conventional insulation materials, is a safety threat.
The danger of hexavalent chromium
Hexavalent chromium is classified as a very hazardous substance, with toxic effects on the environment and serious risks to human health. It is, therefore, essential to understand which situations are at risk and how to deal with them.
Since we have clearly in our minds what happened in the past with asbestos, we cannot ignore the situation and take decades before we recognise the hazardous nature.
It is therefore vital to understand the conditions that facilitate its formation. This compound is the result of a thermochemical reaction that causes the oxidation of chromium (contained in many metal alloys), under certain environmental conditions with the calcium oxide contained in many conventional insulation materials.
The result is a compound called hexavalent chromium, which no longer volatilises below 800°C.
But what are the environmental conditions to pay particular attention to?
- The presence of ‘old style’ insulating materials containing calcium, sodium or potassium.
- The reaching of operating temperatures between 300°C and 600°C.
- The presence of metal alloys containing chromium.
- A specific percentage of oxygen in the working environment
Should all these conditions occur, an imaginary alarm bell must be set off.
How to deal with the problem
Recognising the presence of hexavalent chromium is crucial. During dismantling operations the presence of a yellowish powder is an important indicator.
In such cases, it is essential to act promptly:
- disassembly of insulators must be carried out by properly trained personnel;
- the result of rapid chromium tests can confirm its presence;
- in the event of a positive result, it is important to proceed with immediate remediation;
- handling of materials contaminated with this compound must be entrusted to experienced personnel capable of working safely;
- contaminated materials must be disposed of properly
But what preventive measures can be implemented?
The aspect of prevention is very close to our hearts: in addition to correct information on these risks, what preventive measures can be implemented in industrial plants?
New Componit’s response, which is the result of intensive product research and development, is the design of calcium-free high-temperature insulation systems to ensure the safety of people and environment, in full compliance with international occupational and environmental safety regulations.
For more information on this issue and to request a consultation, CONTACT US.
Simone Balbi –Chief Operating Officer
