Affiliations: Ergonomics Division, University of Siegen, Siegen, Germany
Correspondence:
[*]
Corresponding author: Sandra Groos, Department of Mechanical Engineering, Ergonomics Division, University of Siegen, Paul-Bonatz-Str 9-11, D-57068 Siegen, Germany. Tel.: +49 2717402251; Fax: +49 2717402740; E-mail:groos@ergonomie.uni-siegen.de
Abstract:
BACKGROUND: So far, there exists no internationally
uniform regulation about the pressure limits of water used for putting out
fires in multi-story buildings and large properties. OBJECTIVE: In this ergonomic study, the optimum and maximum
pressure for the fire water supply was tested with respect to physically
feasible and safe indoor fire-fighting. METHODS: In order to prove whether the nozzles work most efficient
and a fire can be extinguished safely and precisely, 12 professional
fire-fighters carried out simulated fire-fighting procedures under nearly
realistic conditions. Throughout the entire test, the electromyographic
activity (EA) from 7 muscles of the right hand-arm-shoulder system and one
muscle of the left arm was recorded. Additionally, a special questionnaire
had to be filled in to evaluate the subjective experiences when handling the
nozzles. RESULTS: The EA - standardized through MVCs (Maximum Voluntary
Contractions) - exceeded the limit for short-term static work for 3
muscles, especially when the pressure was 0.8 MPa and higher. The subjective
ratings confirmed the measured physiological responses. CONCLUSIONS: The operating pressure for the fire water supply
should not exceed 0.6 MPa (as compromise 0.7 MPa), in order to ensure safe and precise
fire-fighting, and that the nozzles work most efficient.
