Document qk1v18GYmOQpXaLax1R0oqRwq

APPENDIX C RESPIRATOR DRYING CABINET One 18 by 36 by 78-in. three-shelf steel cabinet with double doors Three 15-3/4 by 35-3/4 in. pieces of 1/4-in. stainless steel mesh for shelves One 10 by 10 in. piece of window screen for exhaust port One small portable electric heater with fan, 115 Vac, 1650 W Thirty-two size 10 eyebolts Thirty-two clothespins with metal hanging clips Thirty-two spring clips 0 to 180F thermometer Size 10 nuts and bolts. CABINET MODIFICATION On fine side, near the bottom, cut p hole and bolt the heater in place. Make sure the heater has a three-wire (grounded) plug. In the top of the cabinet, cut an 8 bv 8-in. exhaust port and cover it with win dow screen. Cut away each shelf, leaving 1-1/2 in. at each edge, and bolt the stainless steel mesh in place. On the bottom and second shelves, screw the small eye bolts into this mesh about 3 in. apart, and spac ed so that 16 masks can hang in a double row from each shelf without touching each other. The clothespins hang from the eyebolts by specially fabricated metal clips. The thermometer is suspend ed by a small clamp. The temperature inside the cabinet is kept at 120 to 140F. After the cabinet has been loaded with masks, the temperature averages about 125F on the top shelf to 135F at the bottom of the low-hanging masks. The normal cabinet load is 10 to 15 full-face and 24 half-mask respirators and their filter holders. The greatest practical capacity, using both hangers and shelves, is 30 full-face or 60 half-mask respirators. The average drying time is 1 to 1-1/2 h. The total cost of materials and labor is less than $150.00. Figures C-lthrough C-3 show this cabinet. RULES AND REGULATIONS 6271 111.183--2 Exhalation valve leakage teeti minimum requirements. (a) Dry exhalation valves and valve seata will be subjected to a suction of 35 mm. water-column height while In a normal operating position. (b) Leakage between the valve and valve seat shall not exceed 30 milliliters per minute. 8 11.183--3 Facepiece test; minimum re* quiremenu. (a) The complete pesticide respirator will be fitted to the .'aces of persons hav ing varying facial shapes and sizes. (b) where the applicant specifies a facepiece size or sizes for bis' respirator together with the approximate measure ments of faces they are designed to fit, the Bureau will provide test subjects to suit such facial measurements. (c) Any pesticide respirator part which must be removed to perform the facepiece fit test shall be replaceable without special tools and without disturbing face piece fit. <d> The facepiece or mouthpiece fit test using positive or negative pressure recommended by the applicant and de scribed In his Instructions will be used during each test. (e) (1) Each wearer will enter a cham ber containing 1,000 ppm. lsoamylacetate vapor for a respirator equipped with a full facepiece, mouthpiece, hood, or helmet and 100 p.p.m. lsoamyl-acetste vapor for a respirator equipped with a half-mask facepiece. (2) The facepiece, mouthpiece, hood, or helmet may be adjusted, if necessary, In the test chamber before starting the test. (3) Each wearer will remain in the chamber while performing the follow ing activities: (i) Two minutes, nodding and turn ing head; (11) Two minutes, callsthenic arm movements; Oil) Two minutes, running In place; and. (lv) Two minutes, pumping with a tire pump into a 28-llter (1 cubic*foot) container. (4) Each wearer shall not detect the odor of isoamyl-acetate during the test. (d) The particle size distribution at the test suspension will have a geometric mean diameter of 0.4 to 0.6 micrometer, with a standard geometric deviation less than 2. (e) Front-mounted, back-mounted, and chin-style gas mask pesticide res pirators and chemical cartridge pesti cide respirators will be tested for 90 minutes and powered air-purifying res pirators will be tested for 4 hours. 8 11.183--5 Lead fume ted; minimum requirements. Three completely assembled pesticide respirators will be tested with a mechanical-testing apparatus as follows; (a) Continuous airflow through the respirator will be 32 liters per minute for front-mounted, back-mounted, and chin-style gas mask pesticide respirators and chemical cartridge pesticide res pirators and not less than 115 liters (4 cubic feet) per minute, for powered sirpurifying respirators with tight-fitting facepieces, and not less than 170 liters (0 cubic feet) per minute for powered air-purifying respirators with loosefitting hoods and helmets. (b) The test aerosol will contain 1520 milligrams of freshly generated leadoxide fume, calculated as lead, per cubic meter of air. (c) The fume will be generated by im pinging an oxygen-gas flame on molten lead. <d> Front-mounted, back-mounted, and chin-style gas mask pesticide res pirators and chemical cartridge pesticide respirators will be tested for 90 minutes and powered alr-purlfylng pesticide res pirators will be tested for 4 hours. (e) The total amount of unretained test suspension, which is analyzed and calculated as lead, shall not exceed: (1) 0.43 milligram for any 90-minute test; (2) 4.8 milligrams for any 4-hour test made at 115 liters (4 cubic feet) per minute; or (3) 6.2 milligrams for any 4-hour test made at 170 liters (6 cubic feet) per minute. 11.183-6 Dloctyl-phthalate teit; min- imum requirement*. (a) All canisters submitted for use with front-mounted and back-mounted tag mask pesticide respirators will be tested In an atmospheric concentration of 100 micrograms of dloctyl-phthalate per liter of air at continuous flow rates of 32 and 85 liters per minute lor a test period of 5 to 10 seconds. (b) The DOP leakage through the canister shall not exceed 0.03 percent of the ambient DOP concentration. 8 11.183--7 Bench teats; minimum requirementa. (a) (1) Bench tests will be made on an apparatus that allows the test atmos phere at 50+5 percent relative humidity and at room temperature (25*2.5' C.) to enter the canister or cartridge at pre determined concentrations and rates of flow, and that has a means for determin ing the test life of the canister or car tridge against carbon tetrachloride. (2) Canisters and cartridges will be tested as they are used on each pesticide respirator, either singly or in pairs. (3) Three canisters or cartridges or pairs of cartridges will be removed from containers and tested as received from the applicant. (4) Two canisters, cartridges, or pairs of cartridges will be equilibrated at room temperature by passing 25 percent rela tive humidity air through them at the following flow rates (expressed as liters per minute U.p.m.)) for 6 hours; rwco/cnatcf or cartridge I p m- Air-purifyIn* csjUatar________ _____ Alr-purlfylng ctttrMg*----------------------- Powered nr-purifying with ttghtfltting ficeptec#---------------- Powered alr-purlfylng with loosefitting hood or halmat--------------------- 94 2* H5 170 (5) Two canisters, cartridges, or pairs of cartridges will be equilibrated at room temperature by passing 85 percent rela tive humidity air through them at the flow rates stated In subparagraph (4) of this paragraph for 8 hours. (6) The equilibrated canisters or car tridges will be resealed, kept in an up right position at room temperature, and tested within 18 hours. (b) Canisters and cartridges tested in accordance with the provisions of this section shall meet the requirements spec ified in Table 12. { 11.183--4 Silk* dust test;-minimum re quirements. Three completely assembled pesticide respirators will be tested with a mechanical-testing apparatus as fol Tails Caiiok txtxacmloxioe Burn Tun ahd Riquiiiminti roi Canistiu ahd Caitiidoxa do era put u, submrt m. i u.us-7) Type of pesticide rupirater Tut aoneentra- Flow rati Minimum 111*. ttoM, p.p.m. I.p.m. Number of tut* mtnatu1 lows: (a) Temperature In the test chamber will be approximately 26* C. (b) Continuous airflow through the respirator will be 32 liters per minute for front-mounted, back-mounted, and chin-style gas mask pesticide respirators and chemical cartridge pesticide respira tors, and not less than 115 (4 cubic feet) liters per minute to tight-fitting face pieces and 170 liters (6 cubic feet) per minute to loose-fitting hoods and hel mets of powered air-purifying respira tors. (c) The teat aerosol will contain 50-50 milligrams of 99+ percent free silica per cubic meter of air. Chut-moonted m beck-mounted gu aul (u received)................................................................ Chut-moimt*d w buk-mountad gu mill (tqullIbnUd).................. ....................... Chloetvto(**m**k (m r*ed**d)................................ Chln-styk (U mul (tquillbraud)............................ Cbunlcil-cutridg* ruptratcr (a* rwUvad).............. Cb*micK*rtil4t* luptrator (equilibrated)............. Powered dr-purlfying ruptrmtor (tlght-Attlng tacmpta*. a* nodvwt)............................................... Fowered lir-paitfrlng reeptrator (tlgbc-flttfng fictpjte*, Kjnilibrttio)..,,.,,.__ _______________ Powered dj-purtfyln* ruplrator (looaa Bttlns beod or helmet ureeelTed)...,......................................... Powered ilr-purlfyliig rwpinicr Ooom-fitting band or helmet. equilibrated)............................................ 30,000 20,000 A0,,000000 1,000 1.000 1,000 Ip 000 1,000 urn M nM nM13 M1S MU 179 ije 3 4 43I 4 t 4 3 o 1 Minimum life will b* determined t 5 p.p.m. leekege. The flow rata shell be the effective flow rateof the deel, but dull be not lee, thea Hi 1 liai * Tho Sow rat* shill b* th* effect! re flow rat*of tho dedc*. but *b*U b* not 1*** thin 1141- P-mi (PR Doc.73-41 IS mud 3-94-70:8:46 am] 13 130 300 30 80| 3 m 124 StBCRAl MOISTIl, VOL 37, NO. 39--SATURDAY, MARCH 13, 1971 TEN 6751 1 126 TEN 1 Figure C-3. Cabinet loaded with masks. TEN 6753 127