Electrostatics & Technical Rules for Hazardous Substances (TRGS)

In industrial environments, it is important to reduce the risk of electrostatic charges, especially when using materials that are flammable or explosive. To avoid ignition sources, the Technical Rules for Hazardous Substances (TRGS) provide a comprehensive set of regulations.

Content

In this article you will learn more about electrostatics and the TRGS.

What are the Technical Rules for Hazardous Substances (TRGS)?

The Technical Rules for Hazardous Substances are guidelines published by the Federal Institute for Occupational Safety and Health (BAuA - Bundesanstalt für Arbeitsschutz und Arbeitsmedizin) in Germany. They set out the specific requirements of the Hazardous Substances Ordinance and provide guidance for companies in practice. The aim of the TRGS is to protect the health and safety of employees, prevent accidents and protect the environment.

Electrostatics and TRGS

Electrostatics is a major topic in the Technical Rules for Hazardous Substances. It refers to the accumulation of electrical charges on the surface of materials. In many industrial environments, electrostatic charging is virtually unavoidable. However, these charges are associated with hazards that can be prevented or minimised by correct handling. If electrostatics are not handled correctly, sparks can be generated, which can then result in ignition.

But how does electrostatics occur? There are various ways in which an electrostatic charge can develop. Firstly, it can be caused by friction. If two different materials are rubbed together and then separated, electrons are transferred from one material to the other (triboelectric effect). On the other hand, charging can occur when two materials come into contact with each other and are then separated again. There does not have to be any friction for this to occur (contact charging). Humidity and temperature can also influence electrostatic charging.

TRGS 727 - Avoidance of Ignition Hazards due to Electrostatic Charges

TRGS 727 is part of the Technical Rules for Hazardous Substances and replaces and continues TRBS 2153. This regulation specifies the assessment and avoidance of ignition hazards due to electrostatic charges in potentially explosive atmospheres, as well as the selection and implementation of protective measures to avoid these hazards.

The risk of electrostatic charges is not uncommon in industrial environments. This is because the contact and subsequent separation of materials can quickly lead to electrostatic charging. This is a phenomenon that must be avoided at all costs, especially in areas where flammable substances are present. If these charges cannot be dissipated in a controlled manner, sparks can occur, causing flammable atmospheres to ignite. TRGS 727 provides a number of guidelines to minimise these hazards. It also includes specific regulations for hoses. This is because the use of hoses is essential in many industrial processes, for example when transporting gases or liquids. However, they can be potential sources of electrostatic charges. To ensure safety, the requirements of TRGS 727 must be strictly adhered to.

These guidelines include:

For the transport of bulk goods or hazardous substances, hoses should be used that are conductive or antistatic so that electrostatic charges are prevented or dissipated in a controlled manner. The hoses should also be labelled so that their properties are recognisable to everyone.
Hoses that transport flammable or conductive liquids must be earthed.
The insulation of certain sections must also be prevented, as this prevents the dissipation of the charge.
When using couplings or other connectors, it must be ensured that these are also conductive. This is the only way to guarantee continuous earthing. High flow velocities can also lead to electrostatic charging or even increase it. It is therefore important to control the flow velocity and keep it within a safe range.
Controlling the temperature is also a relevant measure to avoid ignition hazards.
In addition, it is important that the hoses and their connections are regularly checked and inspected.

FAQ

Frequently asked questions

Is the TRGS mandatory?

The TRGS are not directly binding in Germany. They are not a law, but they do have legal relevance. For example, they help to implement the Hazardous Substances Ordinance. They also contribute to the safety and health of employees.

What are hazardous substances?

Hazardous substances are mixtures or substances that can pose a risk to the environment and humans due to their properties. They can occur as solids and liquids as well as gases or aerosols. Many of these substances are explosive, oxidising or flammable, for example. As a result, they can be corrosive or irritant, but also toxic, mutagenic or sensitising.

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