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Process stream sampling. Safer designs for manual sampling of liquid process streams.

Lovelace BG
Symposium proceedings: control technology in the plastics and resins industry. Cincinnati, OH: U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control, National Institute for Occupational Safety and Health, DHHS (NIOSH) Publication No. 81-107, 1981 Jan; :76-97
Safe sampling methods capable of covering a diversity of sampling situations for liquid line sampling in the chemical industry were discussed. The author notes that the approach is applicable to other types of sample systems. The method for sampling design involves determining sampling needs of the process and then interpreting each sample point as a distinctive piece of equipment. Use of a specification sheet for each sample location was shown. The specification sheet summarized operating conditions for each sample. Specific data sections helped define hazards associated with a particular sample material; focused on some of the specific conditions involved in sample collection, including sample size; summarized special handling conditions necessary for obtaining a safe sample; and indicated specifications for actual installation of the sample system. Use of an enclosure to isolate hazardous samples from the worker was suggested in place of enclosing the worker in protective clothing and gear. A plastic sample box enclosure, plywood sample box enclosure, and freon can sample box enclosure were described. All sample boxes were simple to use, permitted easy visual operation, and offered increased protection by containment. Indirect line samplers had inherent safety features isolating samples from the process and restricting volume. A sampling plug valve and double three part valve arrangement were described. Use of a sample chamber attached directly to the process line was also assessed. Direct line sampling methods included piston ram type valve, use of a hypodermic type syringe, and three port or cross pattern valve installed in a bypass loop of the process line. The author concludes that process sampling needs must be carefully anticipated and equipment carefully designed to produce a system that meets safety, quality, and cost requirements.
Worker-health; Occupational-hazards; Industrial-hygiene; Regulations; Industrial-safety; Chemical-manufacturing-industry; Sampling-equipment; Organic-solvents
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Symposium proceedings: control technology in the plastics and resins industry
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division