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Chemwatch:4650.13 Page 8 of 18 Issue Date:11/12/2018 Version No:7.1.1.1 API Pond Ammonia Test Solution#1 Print Date:06/21/2019 Velocity generally decreases with the square of distance from the extraction point(in simple cases). Therefore the air speed at the extraction point should be adjusted,accordingly,after reference to distance from the contaminating source. The air velocity at the extraction fan,for example,should be a minimum of 1-2.5 m/s(200-500 f/min.)for extraction of gases discharged 2 meters distant from the extraction point. Other mechanical considerations,producing performance deficits within the extraction apparatus,make it essential that theoretical air velocities are multiplied by factors of 10 or more when extraction systems are installed or used. The need for respiratory protection should also be assessed where incidental or accidental exposure is anticipated: Dependent on levels of contamination,PAPR,full face air purifying devices with P2 or P3 filters or air supplied respirators should be evaluated. The following protective devices are recommended where exposures exceed the recommended exposure control guidelines by factors of: 10; high efficiency particulate(HEPA)filters or cartridges 10-25;loose-fitting(Tyvek or helmet type)HEPA powered-air purifying respirator. 25-50;a full face-piece negative pressure respirator with HEPA filters 50-100;tight-fitting,full face-piece HEPA PAPR 100-1000;a hood-shroud HEPA PAPR or full face-piece supplied air respirator operated in pressure demand or other positive pressure mode. f_ Personal protection 10 00 Safety glasses. Safety glasses with side shields. Chemical goggles. Contact lenses may pose a special hazard;soft contact lenses may absorb and concentrate irritants.A written policy document,describing the wearing of lenses or restrictions on use,should be created for each workplace or task.This Eye and face protection should include a review of lens absorption and adsorption for the class of chemicals in use and an account of injury experience.Medical and first-aid personnel should be trained in their removal and suitable equipment should be readily available.In the event of chemical exposure,begin eye irrigation immediately and remove contact lens as soon as practicable.Lens should be removed at the first signs of eye redness or irritation-lens should be removed in a clean environment only after workers have washed hands thoroughly.[CDC NIOSH Current Intelligence Bulletin 59],[AS/NZS 1336 or national equivalent] Skin protection See Hand protection below NOTE: The material may produce skin sensitisation in predisposed individuals.Care must be taken,when removing gloves and other protective equipment,to avoid all possible skin contact. Contaminated leather items,such as shoes,belts and watch-bands should be removed and destroyed. The selection of suitable gloves does not only depend on the material,but also on further marks of quality which vary from manufacturer to manufacturer.Where the chemical is a preparation of several substances,the resistance of the glove material can not be calculated in advance and has therefore to be checked prior to the application. The exact break through time for substances has to be obtained from the manufacturer of the protective gloves and.has to be observed when making a final choice. Personal hygiene is a key element of effective hand care.Gloves must only be worn on clean hands.After using gloves, hands should be washed and dried thoroughly.Application of a non-perfumed moisturiser is recommended. Suitability and durability of glove type is dependent on usage.Important factors in the selection of gloves include: frequency and duration of contact, chemical resistance of glove material, glove thickness and Hands/feet protection dexterity Select gloves tested to a relevant standard(e.g.Europe EN 374,US F739,AS/NZS 2161.1 or national equivalent). When prolonged or frequently repeated contact may occur,a glove with a protection class of 5 or higher (breakthrough time greater than 240 minutes according to EN 374,AS/NZS 2161.10.1 or national equivalent)is recommended. When only brief contact is expected,a glove with a protection class of 3 or higher(breakthrough time greater than 60 minutes according to EN 374,AS/NZS 2161.10.1 or national equivalent)is recommended. Some glove polymer types are less affected by movement and this should be taken into account when considering gloves for long-term use. Contaminated gloves should be replaced. As defined in ASTM F-739-96 in any application, gloves are rated as: Excellent when breakthrough time>480 min Good when breakthrough time>20 min Fair when breakthrough time<20 min Poor when glove material degrades Continued...