TRGS 727 Requirements for Dust-Transport Hoses

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Grounding and material checks by application

A hose’s suitability for transporting flammable liquids does not establish its suitability for safe dust transport. TRGS 727, the German technical rule on preventing ignition hazards from electrostatic charges, expressly prohibits that inference. The provisions below come from its January 2016 edition, corrected July 2016.

TRGS 727’s combustible-dust equipment grounding provisions distinguish aspiration from pneumatic transport. The following requirements address specific grounding and material questions within section 6.4; they are not a complete hose-selection specification.

Conductive hose parts in aspiration

Section: 6.4.1

Section 6.4.1 requires all conductive hose parts, including support helices and fittings, to be grounded regardless of the hose material chosen.

Wall material in pneumatic transport

Section: 6.4.2
Measure: Volume resistance only

For pneumatic transport of bulk solids, section 6.4.2 permits only volume resistance (specific resistance) to be used when characterizing pipe or hose wall material as conductive or dissipative. Surface resistance alone is not permitted.

Multilayer pipes and hoses

Section: 6.4.2.3(4)

For multilayer pipes and hoses in pneumatic transport of bulk solids, section 6.4.2.3(4) requires all conductive components to be grounded and all dissipative components to be brought into contact with earth.

For vacuum equipment, section 5.7 also requires pipes and hoses to meet section 6.4, alongside its nozzle and collection-container earth-path requirements.

Frequently Asked Questions

No. TRGS 727 prohibits inferring suitability for safe dust transport from a hose’s suitability for flammable liquids. Its dust provisions separately address aspiration and pneumatic transport.

No. For pneumatic transport of bulk solids, TRGS 727 section 6.4.2 permits characterization of pipe or hose wall material as conductive or dissipative using only volume resistance, expressed as specific resistance. Surface resistance alone is not permitted.

In TRGS 727’s aspiration provisions, all conductive hose parts, including support helices and fittings, must be grounded regardless of the hose material. In its separate pneumatic-transport provisions for multilayer pipes and hoses, all conductive components must be grounded and all dissipative components brought into contact with earth.