ILO Home
Go to the home page
Site map | Contact us Français | Español

CISDOC database

Document ID (ISN)103062
CIS number 04-150
ISSN - Serial title 0007-9952 - Cahiers de notes documentaires - Hygiène et sécurité du travail
Year 2003
Convention or series no. INRS ND 2185-190-03
Author(s) Rapp R., Danet J.P., Dubernet F., Magniez G., Aussel H., Rolin A.
Title Asbestos site airflow - Study and analysis of ventilation airflow in personnel airlocks using the EOL3D numerical simulation method
Original title Aéraulique des chantiers d'amiante - Etude et analyse des écoulements de ventilation, par simulation numérique avec EOL3D, du sas d'accès du personnel [in French]
Bibliographic information 1st Quarter 2003, No.190, p.13-22. Illus. 6 ref.
Internet access$FILE/nd2185.pdf [in French]
Abstract In asbestos removal operations, access to the confined working area is ensured by a ventilated entry lock (tunnel). An assessment of the performance of various tunnel ventilation configurations was carried out by means of numerical simulation using EOL3D, a predictive ventilation software developed by INRS. Cleaning times, the age distribution of fresh air and the distribution and average of air velocities were the main indicators used to assess the configurations. Separated ventilation systems (from that of the confined area) were the most efficient in terms of air decontamination. In contrast, the flow rates required are high (>4,000m3/h). A good alternative consists of using a lock equipped with openings laid out alternately (top/bottom) and subject to the negative pressure of the confined area. The surface area of the opening must allow the passage of air at a flow rate of about 1,000m3/h to obtain a decontamination time of less than one minute. Tunnels, which favour an air flow located only at the top or bottom, such as tunnels equipped with flexible screens, should be avoided.
Descriptors (primary) asbestos; construction sites; building industry; asbestos removal; ventilation design; confined spaces
Descriptors (secondary) work in confined spaces; computer simulation; airflow measurement; ventilation systems
Document type D - Periodical articles
Country / State or ProvinceFrance
Subject(s) Toxic and dangerous substances
Broad subject area(s) Chemical safety
Browse category(ies) Ventilation
Construction industry and civil engineering
Confined spaces