Guide to the safe handling of solvents in a bituminous ... - Aapaq.org

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• replace air as it is exhausted to the outside via local ventilationdevices such as fume hoods;• provide a controlled environment for specialised areas such assurgery or computer rooms.General ventilation systems comprise an air supply and an air exhaust.The air may be supplied via a central HVAC (Heating, Ventilation and AirConditioning) system or, especially in older buildings, via opening windows.Laboratory air may be exhausted through either local exhaust devices or airreturns connected to the HVAC system. Local exhaust ventilation systemscapture and discharge air contaminants or heat from points of release.Common local exhaust ventilation devices found in laboratories include:• chemical fume hoods;• canopy hoods;• slotted hoods;• biological safety cabinets;• direct connections.Chemical hoods, canopy hoods and direct connections exhaust devicescan be used for binder and asphalt laboratories:• Chemical fume hoods: Chemical fume hoods are enclosed unitswith a sliding sash for opening or closing the hood. They are able tocapture and exhaust even heavy vapours, and are preferred for alllaboratory procedures that require manual handling of hazardouschemical material. (Refer to sub-section on safe use of chemical fumehoods below for information on the safe use of chemical fume hoods).• Canopy hoods: Canopy hoods are designed to capture heat fromprocesses or equipment, such as atomic absorptionspectrophotometers or autoclaves; a canopy or bonnet is suspendedover a process and connected to an exhaust vent. The followinglimitations make canopy hoods poor substitutes for chemical fumehoods, because they: draw contaminated air through the user’s breathing zone; do not capture heavy vapours; provide less containment than chemical fume hoods, and aremore affected by air turbulence; do not provide adequate suction more than a few inches awayfrom the hood opening.58
• Direct connections: Direct connections provide direct exhausting ofcontaminants to the outdoors and are used for venting: flammable liquid storage cabinets; other toxic chemical storage cabinets; solvent and waste reservoirs, such as for HPLC solvent systems; reaction vessels, sample analysers, ovens, dryers and vacuumpump outlets.• Ventilation balancing and containment: By regulation, more air isexhausted from a laboratory than is supplied to it, resulting in a netnegative pressure (vacuum) in the laboratory. Negative pressuredraws air into the laboratory from surrounding areas, and serves toprevent airborne hazardous chemicals from spreading outside thelaboratory in the event of an accidental release inside the laboratory.Balancing of laboratory ventilation must take into consideration theamount of air exhausted by local ventilation devices such as fumehoods. Modern laboratories do not have opening windows, asopening of windows tends to pressurise a room, pushing air from thelaboratory into adjacent non-laboratory areas. Safe use of chemical fume hoods: Fume hoods properly usedand maintained will render substantial protection, provided theuser is aware of its capabilities and limitations. The recommendedperformance standard for fume hoods is the delivery of a minimumface velocity of 100 linear feet per minute (0,5 m/s) at half sashheight. An anemometer for determining a fume hood's facevelocity should be available from Environmental Health and Safety(SHE/SHEQ). To ensure your fume hood provides the highestdegree of protection observe the following guidelines:¨¨¨¨Only materials being used in an ongoing experiment should bekept in the fume hood. Cluttering the hood will create air flowdisturbances;When it is necessary to keep a large apparatus inside a hood,it should be placed upon blocks or legs to allow air to flowunderneath;Operate the hood with the sash as low as practical. Reducingthe open face will increase the face velocity;Work as far into the hood as possible. At least six inches isrecommended;59
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Guide to the safe handling ofsolven
Page 4 and 5:
Sabita DVD SeriesDVD100DVD200DVD300
Page 6 and 7:
CONTENTS1. Introduction2. Solvent s
Page 8 and 9: • The use of High Performance Liq
Page 10 and 11: 2. Solvent specific test methods2.1
Page 12 and 13: • A mass balance requires a tempe
Page 14 and 15: *Jojoba oil (pronounced “ho-HO-ba
Page 16 and 17: properties of the recovered binder.
Page 18 and 19: Table 1. Coefficients of variationM
Page 20 and 21: • Temperature - Although binder h
Page 23 and 24: • Density - In general, a solvent
Page 25 and 26: 2.5. The determination of the softe
Page 27 and 28: 4. Evaluating the cost-effectivenes
Page 29 and 30: 6. Conclusions and recommendationsT
Page 31 and 32: absorptive limestone). In this way
Page 33 and 34: 13. Peterson, GD, Davison, RR, Glov
Page 35 and 36: in a location close to where the pr
Page 37 and 38: product identifier (product name);
Page 39 and 40: eye wash bottles and safety showers
Page 41 and 42: • reaction to naturally-occurring
Page 43 and 44: consulting the MSDS for the product
Page 45 and 46: those which could compromise an ind
Page 47 and 48: • Reactive chemicals May be sensi
Page 49 and 50: The following guidelines should be
Page 51 and 52: mercury air concentrations. If a la
Page 53 and 54: Be prepared to repeat the process i
Page 55 and 56: Leaking regulators, cylinder valves
Page 57: Peroxide-forming (e.g. ether) and e
Page 61 and 62: This guide is available on the UK H
Page 63 and 64: Factors that can increase the risk
Page 65 and 66: containers that may be contaminated
Page 67 and 68: Record each run in a logbook: keep
Page 69 and 70: • Gas chromatographs (GC): Gas ch
Page 71 and 72: Locate and know how to test and ope
Page 73 and 74: Do not remove a dressing that has b
Page 75 and 76: As soon as the flames are extinguis
Page 77 and 78: Appendix B - Recommendations for so
Page 79 and 80: • All packages in storage should
Page 81 and 82: Table 2.Examples of incompatible co
Page 83 and 84: Table 3. Suggested segregation for
Page 85 and 86: • Keep picric acid solutions wet
Page 87 and 88: peroxides. The radius shall be meas
Page 89 and 90: acute health effect - an effect tha
Page 91 and 92: 8 Corrosive; 9 Miscellaneous.ED50 (
Page 93 and 94: freezing point - the temperature at
Page 95 and 96: airborne substance, averaged over a
Page 97 and 98: teratogen - chemical which may caus
Page 99 and 100: • Many of the occupation exposure
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