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Effectiveness of Dust Control Systems Tested for use During Masonry Restoration – The Sequel. RT 232 - Implementing Engineering Controls in Construction - Needs, Challenges, and Effectiveness June 4th, 2014. Michael R. Cooper, CIH, CSP, MPH [email protected]

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Effectiveness of dust control systems tested for use during masonry restoration the sequel
Effectiveness of Dust Control Systems Tested for use During Masonry Restoration – The Sequel

RT 232 - Implementing Engineering Controls in Construction - Needs, Challenges, and Effectiveness

June 4th, 2014

Michael R. Cooper, CIH, CSP, MPH

[email protected]


The local exhaust ventilation system evaluations being described are part of a four-year NIOSH-funded project to reduce exposures in construction


To reduce silica exposures during tuckpointing lev systems must be
To reduce silica exposures during described are tuckpointing, LEV systems must be:


Our partnership identified tuckpointing lev systems to evaluate
Our partnership identified described are tuckpointing LEV systems to evaluate


The partnership rated the following as the described are most important criteria when selecting systems for further evaluation:

  • Impact on productivity

  • Durability

  • User acceptance/compatibility with existing work practices

  • Blade visibility


While considering these criteria, the partnership selected described are tuckpointing LEV systems for further evaluation

  • Impact on productivity

  • Durability

  • User acceptance/compatibility with existing work practices

  • Blade visibility



The partnership selected from seven tuckpointing shrouds
The partnership selected from seven most prominent in constructiontuckpointing shrouds

ICS Dust Director

Hilti Tuck Point Dust Removal Hood

Joe Due Blades and Equipment Dust Mizer

Bosch Tuckpointing Shroud

Dustless Technologies CutBuddie II

Arbortech AS170 Brick and Mortar Saw

Danish Tool North America Tuckpointing Router Bit and Shroud


The partnership selected from 14 vacuums
The partnership selected from 14 vacuums most prominent in construction

ICS Vacuums (4 models)

Hilti VC 40U Vacuum

Little Red Ruwac WNS 2220

Bosch Airsweep™ 13 Gallon Wet/Dry Vacuum Cleaner with Power Broker

Tiger-Vac AS-400 HEPA

Dustless Technologies HEPA Vac

Dustcontrol Vacuums (3 models)

Ermator Vacuums (2 models)


Four high ranking systems were tested with and without lev in a controlled setting
Four high most prominent in constructionranking systems were tested, with and without LEV, in a controlled setting

  • Metabo grinder, ICS Dust Director shroud with Dustcontrol 2900 vacuum

  • Bosch grinder, ICS Dust Director shroud with Dustcontrol 2900 vacuum

  • Boschgrinders, ICS Dust Director shroud with Ermator S26 vacuum

  • Hilti grinder, Hilti shroud with Hilti vacuum


Test conditions and data collected were consistent between evaluations
Test conditions and most prominent in constructiondata collected were consistent between evaluations

  • Used type S mortar after 28+ days curing

  • Used filter (HEPA or 99.9%) recommended by manufacturer

  • Conducted at least five trials per tool/control combination

  • Randomized trial order to minimize bias

  • Sampled for 16 to 26-minute with LEV, approximately half as long without LEV

  • Sampled respirable silica sampling with BGI GK2.69 cyclone at 4.2 lpm

  • Measured static pressure to monitor flow rate

  • Documented mass of dust collected by LEV

  • Documented linear feet of joints cut per minute


Using the most prominent in constructionMetabo grinder with the Dust Director shroud and DustControl vacuum reduced respirable silica exposures by 95.6%


Using this lev system reduced exposures by 95 6
Using this LEV system reduced exposures by 95.6% most prominent in construction

6.3

130 times REL

0.28

5.5 times REL

0.05


Using the Bosch grinder with the Dust Director shroud and most prominent in constructionDustControl vacuum reduced respirable silica exposures by 98.7%


Using this lev system reduced respirable silica exposures by 98 7
Using most prominent in constructionthis LEV system reduced respirable silica exposures by 98.7%

7.2

140 times REL

1.8 times REL

0.09

0.05


Using the Bosch grinder with the Dust Director shroud and most prominent in constructionErmator vacuum reduced respirable silica exposures by 97.6%


The ermator s26 is rated to provide sufficient air flow to support two grinders
The most prominent in constructionErmator S26 is rated to provide sufficient air flow to support two grinders


Using this lev system reduced respirable silica exposures by 98 71
Using most prominent in constructionthis LEV system reduced respirable silica exposures by 98.7%

35

690 times REL

0.82

16 times REL

0.05


Using the complete hilti tuckpointing lev system reduced respirable silica exposures by 96 6
Using the most prominent in constructioncomplete Hilti tuckpointing LEV system reduced respirable silica exposures by 96.6%


Using this lev system reduced exposures by 96 6
Using this LEV system reduced exposures by 96.6% most prominent in construction

11

220 times REL

0.38

7.5 times REL

0.05



Test conditions and data collected were consistent between evaluations1
Test conditions and grinder shroud from data collected were consistent between evaluations

  • Used type S mortar after 28+ days curing

  • Used HEPA filter as recommended by manufacturer

  • Conducted at least three trials per tool/control combination

  • Randomized trial order to minimize bias

  • Sampled for 24 minutes with LEV and 10 minutes without LEV

  • Sampled respirable silica sampling with BGI GK2.69 cyclone at 4.2 lpm

  • Measured static pressure to monitor flow rate

  • Documented mass of dust collected by LEV


Using the grinder shroud from Bosch grinder with the Ermator shroud and Ermator S13 vacuum reduced respirable silica exposures by 96.1%


Using this lev system reduced exposures by 96 1
Using this LEV system reduced exposures by 96.1% grinder shroud from

5.9

120 times REL

0.23

0.05


Using grinder shroud from Bosch grinders with the Ermator shrouds and Ermator S26 vacuum reduced respirable silica exposures by 97.8%


Using this lev system reduced exposures by 97 8
Using this LEV system reduced exposures by 97.8% grinder shroud from

8.1

160 times REL

3.6 times REL

0.18

0.05


The highest flow rates at the tool were 79 percent of the manufacturers’ specifications for the vacuums tested



The average flow rates returned to 85 to 102 percent of our desired flow rate after filter cleaning
The average flow rates returned to 85 to 102 percent of our desired flow rate after filter cleaning


The available tuckpointing lev systems can be effective but there are challenges
The available desired flow rate after filter cleaningtuckpointing LEV systems can be effective but there are challenges


Acceptance and effectiveness varies with the user
Acceptance and effectiveness varies with the user desired flow rate after filter cleaning





Average exposure reduction was 97 percent but additional controls may be needed
Average exposure reduction was 97 percent but additional controls may be needed

Respirable Silica (mg/m3)

10 X NIOSH REL

NIOSH REL


Questions
Questions? controls may be needed

Michael R. Cooper, CIH, CSP, MPH [email protected]


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