TRGS 727 Technical Rules for Hazardous Substances - Prevention of Ignition Hazards Due to Electrostatic Charges

The TRGS 727 standard has replaced the previously published TRBS 2153 standard. With the publication of this standard, changes have been made to the specifications for technical quality hoses designed for use in potentially hazardous areas. The new standard now distinguishes between pneumatic and aspiration conveying. Surface and conductive resistance to static charging remain criteria for determining whether a hose can be used for aspirated conveying in a given situation. Now the criterion that determines where pneumatic conveying will be used is resistance.

A few changes introduced with the new TRGS 727 standard are as follows:

• Only metallic, empty, non-insulated, uncoated wires may be used as the support spiral/coil.
• The support spiral / helix must be grounded at both ends.
• Spiral / coiled wire diameter is between 1 mm and 2 mm.
• The distance between the inner hose lining surface and the spiral / coiled wire surface (ie layer thickness) is between 0,7 mm and 2 mm.
• The inclination of the spiral / helix is ​​not greater than 30 mm.
• The spiral / helix is ​​integrated in a homogeneous material with a specific resistance less than the value described.
• The inner diameter of the hose / duct is between 50 mm and 160 mm.
• The relative permeability of the wall material is not greater than 5.

In short, the TRGS 727 standard applies to the assessment and avoidance of ignition hazards as a result of electrostatic charges in potentially explosive atmospheres and the selection and application of protective measures to avoid these hazards. It also applies similarly to the assessment and avoidance of ignition hazards of explosive mixtures under conditions other than atmospheric conditions or in other reactants and other reactive systems. This standard is similarly applied to avoid electrostatic charges as the cause of fires. It also applies to the assessment of areas endangered by explosive substances and mixtures, unless there is a regulation.

Among the numerous test, measurement, analysis and evaluation studies it provides for businesses in various sectors, our organization also provides test services for the prevention of ignition hazards due to electrostatic charges for dangerous goods, within the scope of TRGS 727 standard, with its trained and expert staff and advanced technological equipment.