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CISDOC database

Document ID (ISN)34784
CIS number 81-192
ISSN - Serial title 0003-4878 - Annals of Occupational Hygiene
Year 1980
Convention or series no.
Author(s) Bancroft B., Greenough G.K., Hodges J.P., Whitelaw D.G.
Title Measurement of the dust protection and airflow of a helmet respirator.
Bibliographic information 1980, Vol.23, No.3, p.295-304. Illus. 7 ref.
Abstract Dust protection is measured by placing the helmet on a dummy head mounted in a test chamber and exposing it to an aerosol of fine NaCl particles. Air is drawn through an orifice in the dummy's mouth to simulate breathing. Sampling is done inside and outside the helmet. Two methods of measuring airflow are described. In one, a variable-flow pump is used to overcome the resistance of a flow meter; the pump output is adjusted until the air entering the respirator is at atmospheric pressure, and the helmet is then considered to be operating under normal conditions. The second method uses a perforated flow-plate which is drawn against the helmet air intake by the airflow. By adjusting the weight and airflow resistance of the plate, it can be made to remain in place at the desired minimum airflow rate.
Descriptors (primary) dust helmets; flowrate measurement; air purifying respirators
Descriptors (secondary) description of technique; equipment testing
Document type D - Periodical articles
Subject(s) Personal protection
Broad subject area(s)
Browse category(ies) Respiratory protection
Head protection