Part 2. Overview. Risk management. Workplace health and safety legislation. How should asbestos exposure be managed? Identifying asbestos hazards

Transcription

1 Part 2. Overview Risk management Workplace health and safety legislation How should asbestos exposure be managed? identify hazards assess risk decide on control measures implement control measures monitor and review Identifying asbestos hazards two types loosely bound (friable) firmly bound (non-friable/bonded) 1

2 Friable asbestos insulation used in domestic heaters and stoves ceiling products Friable asbestos underlay some old vinyl floor covering ceiling insulation commercial buildings unlikely in domestic premises Friable asbestos particularly hazardous licensed professional (A Class certificate) 2

3 Non-friable asbestos may be found in the following flat or corrugated sheeting water or flue pipes Non-friable asbestos may be found in the following imitation brick cladding vinyl floor tiles roof shingles textured paint 3

4 Asbestos-cement sheeting Manufactured from 1940 to early 1980 s Most common uses Corrugated roofing Flat sheets for ceiling and walls 4

5 What is AC sheeting? mixture of cement, sand and cellulose reinforced with asbestos fibres hardier, lighter & more useful commonly used many building materials (1940s and early 1980s) What is AC sheeting? prior to 1970 blue and brown 1970 to 1980s white AC poses fewer health risks remain firmly bound cement matrix Asbestos products and asbestos contents Approximate asbestos content (% weight) Asbestos fibre type A-C Building products A-C pressure, sewage, & drainage pipes Fire resistant insulation boards Insulation products including spray Jointings and packings Friction materials C, A, Cr C, Cr, A A, C A, C, Cr C, Cr C Environmental Health Criteria 53 (1986) 5

6 Asbestos products continued Approximate asbestos content (% weight) Textile products not include in Friction materials Floor tiles and sheets Asbestos fibre type C, Cr C Moulded plastics and battery boxes Fillers and reinforcements and products made thereof (felts, millboard, paper, filter pads for wines and beers, underseals, mastics, adhesives, coatings, etc) C, Cr C, Cr Environmental Health Criteria 53 (1986) Assessing asbestos risk The level of risk will depend on the: the type of asbestos fibre the type of asbestos (friable or bonded) the task that is being carried out the control measures Assessing asbestos risk The task being carried out High Low Sprayed coating/loose fill Lagging and packings AIB Rope and gaskets Millboard and paper Asbestos cement Floor tiles, mastic and roof felt Decorative paints and plasters 6

7 Task being carried out AC poses fewer health risks remain firmly bound tooled, cut, sanded or otherwise abraded or machined (particularly at high speeds) How to protect yourself and others Assess the risk: Does building age imply likely asbestos content? How long will you or others be exposed? Will significant levels of airborne dust/fibre be encountered? (power tool usage, broken sheets) Is the area well ventilated? (indoor v outdoor) Assessing risk The level of risk will depend on: the type of asbestos fibre the type of asbestos (friable or non friable) the task that is being carried out the control measures 7

8 Legislation Workplace Health and Safety Act 1995 Workplace Health and Safety Regulation 1997 Workplace Health and Safety Act The Act sets out the obligations of persons conducting a business or undertaking, workers, persons in control, designers, manufacturers, importers and suppliers The regulation Part 11 The regulation prescribes ways to prevent or manage asbestos exposure 8

9 National Codes of Practice Code of Practice for the Management and Control of Asbestos in Workplaces [NOHSC:2018(2005) (management code) Code of Practice for the Safe Removal of Asbestos 2 nd Edition [NOHSC:2002(2005)] (removal code) Removal Code Part 9 General Requirements for the Removal of ACM from Workplaces Part 12 Examples of Specific Asbestos Removal Procedures Removal Code Part 9 General requirements for the removal of ACM from workplaces determining boundaries security, signs and barriers electrical and lighting installations wet and dry methods 9

10 Removal Code Part 9 General requirements for the removal of ACM from workplaces equipment RPE PPE air monitoring decontamination waste removal Removal Code Part 12 Examples of specific asbestos removal procedures AC sheets AC Roofing vinyl floor tiles and sheet vinyl containing asbestos Removal Code Part 12 asbestos-backed vinyl and millboard 10

11 Removal Code Part 12 asbestos mastics and bitumen friction products Removal of AC sheets erect barrier and warning signs need for enclosure and decontamination facility determined by risk assessment PPE sheeting wet with water during the removal process unless electrical hazard roofing - PVA Barrier and warning signs site clearly defined to ensure non-essential people no not enter and to clearly delineate removal site and warn people 11

12 Removal of AC sheets tape can be used a barrier for some types of removal work of short duration if sign not feasible tape with the words asbestos hazard along it s length RPE When removing sheeting wear appropriate RPE & be clean shaven (Appendix C) Asbestos Removal Code Appendix C 12

13 Wet spray method (most preferred) whenever possible, dry ACM must not be worked on wet spray method is the most preferred removal method ACM must be saturated through its full depth; and maintained in a wet condition Wet spray method (most preferred) It is helpful to use: wetting agent (surfactant) detergent is added to the water facilitates more rapid wetting of the ACM Wet spray method (most preferred) manually controlled, consistent low pressure, coarse spray adjustable pistol-grip garden hose is recommended 13

14 Dry removal method (least preferred) must be used only if: The wet spray method is not suitable (eg if there are live conductors or major electrical equipment could be damaged/made dangerous from contact with water When removing AC sheeting sheets must be wetted using a fine spray nails nail punch if necessary nails punched through the sheeting pliers or nippers When removing AC sheeting anchoring bolts oxy torch bolt cutters disposed of asbestos waste 14

15 AC sheet removal minimal breakage lowered to the ground no dropping sheets, use of ramps, chutes or gravity dependant devices backs of sheets wetted Asbestos removal equipment/tools no power tools on A-C Sheeting if manually operated hand tools not sufficient low speed battery powered tools + wet method Asbestos removal equipment/tools LSBP + wet methods unsuitable LEV dust control hood shadow vacuuming air speed 1m/sec diameter of nozzle 15

16 Asbestos removal equipment/tools high-speed power tools angle grinders sanders saws high speed drills must never be used Removal process ACM must be sealed in double lined heavy-duty plastic sheeting; or double bagged before placing in skip AC removal place directly into waste skip, vehicle tray double lined polyethylene sheeting kept damp 16

17 AC removal once full sealed with plastic sheeting used for storage able to be secured eg lockable lid Removal process.2 mm thick 1200mm x 900mm appropriately labelled waste must be double bagged Removal process *AC residue should be cleaned using wet decontamination methods (9.9.1) *Dry methods using vacuum cleaner with appropriate filtration (HEPA) 17

18 Personal decontamination/ procedure small amts bonded ACM 1. vacuum and/or wet wipe 2. remove protective clothing (with RPE on) and place in waste bag and/or wetted and bagged for laundering 3. vacuum clothing and footwear (+wet wipe footwear) 4. discard (disposable) RPE in waste bag 5. face, hands, fingernails. 18

19 Cleaning and treatment appendix E of the management code painting and sealing Prohibition on using high pressure water process to clean ACM Using high pressure water process to clean ACM 19

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