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Evaluation of pump pulsation in respirable size-selective sampling: part I. Pulsation measurements.

Authors
Lee-EG; Lee-L; Mohlmann-C; Flemmer-MM; Kashon-M; Harper-M
Source
Ann Occup Hyg 2014 Jan; 58(1):60-73
NIOSHTIC No.
20043210
Abstract
Pulsations generated by personal sampling pumps modulate the airflow through the sampling trains, thereby varying sampling efficiencies, and possibly invalidating collection or monitoring. The purpose of this study was to characterize pulsations generated by personal sampling pumps relative to a nominal flow rate at the inlet of different respirable cyclones. Experiments were conducted using a factorial combination of 13 widely used sampling pumps (11 medium and 2 high volumetric flow rate pumps having a diaphragm mechanism) and 7 cyclones [10-mm nylon also known as Dorr- Oliver (DO), Higgins-Dewell (HD), GS-1, GS-3, Aluminum, GK2.69, and FSP-10]. A hot-wire anemometer probe cemented to the inlet of each cyclone type was used to obtain pulsation readings. The three medium flow rate pump models showing the highest, a midrange, and the lowest pulsations and two high flow rate pump models for each cyclone type were tested with dust-loaded filters (0.05, 0.21, and 1.25 mg) to determine the effects of filter loading on pulsations. The effects of different tubing materials and lengths on pulsations were also investigated. The fundamental frequency range was 22.110 Hz and the magnitude of pulsation as a proportion of the mean flow rate ranged from 4.4 to 73.1%. Most pump/cyclone combinations generated pulse magnitudes .10% (48 out of 59 combinations), while pulse shapes varied considerably. Pulsation magnitudes were not considerably different for the clean and dust-loaded filters for the DO, HD, and Aluminum cyclones, but no consistent pattern was observed for the other cyclone types. Tubing material had less effect on pulsations than tubing length; when the tubing length was 183 cm, pronounced damping was observed for a pump with high pulsation (>60%) for all tested tubing materials except for the Tygon Inert tubing. The findings in this study prompted a further study to determine the possibility of shifts in cyclone sampling efficiency due to sampling pump pulsations, and those results are reported subsequently.
Keywords
Pumps; Sampling; Sampling-equipment; Monitoring-systems; Particulate-sampling-methods; Particulates; Coal-dust; Respiration; Author Keywords: amplitude; frequency; pulsation magnitude; pump pulsation; respirable cyclones; sampling efficiency shift
Contact
Eun Gyung Lee, National Institute for Occupational Safety and Health, Health Effects Laboratory Division, Exposure Assessment Branch, 1095 Willowdale Road, Morgantown, WV 26505
CODEN
AOHYA3
Publication Date
20140101
Document Type
Journal Article
Email Address
dtq5@cdc.gov
Fiscal Year
2014
NTIS Accession No.
NTIS Price
Identifying No.
M102013
Issue of Publication
1
ISSN
0003-4878
NIOSH Division
HELD
Priority Area
Mining
Source Name
Annals of Occupational Hygiene
State
WV
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