Evaluation on the Collection Efficiency and Performance of the Sound Pressure Machine Equipped with a HEPA Filter Eliminating Asbestos Particles

When the one-pass collection efficiency of each size of particles of the sound pressure machine equipped with a glass fiber HEPA filter to get rid of friable asbestos at the asbestos elimination field was evaluated, the collection efficiency of those with the size of 0.3um was examined to be 98.91%. That of the particles of 0.5um size was proved to be 99.21% on average, which is a little bit higher than that of 0.3um size. The 1.0um particles showed 100% of efficiency, and the collection efficiency of each size had statistically meaningful differences.


Introduction
Asbestos is a mineral fiber found in nature.It is a fireresistant building material and comes in such different forms as asbestos tile and slate, etc.It is also widely used as a heat-resistant industrial good in household products, electric goods and jets.Use of anti-scattering products for high-risk asbestos work classified under the most stringent Class H in the UK in terms of carcinogenicity and hazard are advised in order to keep asbestos particles from scattering indoors [1,2].Specifications for performance, test standards and evaluation of antiscattering products are still much too loose compared to those adopted outside of Korea, which limits the efforts to measure performance of the products.Most of them are not properly graded and sound pressure machines used for removing asbestos can rarely be applied indoors due to their high filter differential pressure, use of high electricity to deliver high air flow and high note [3].Hence, an indicator that grades anti-scattering products based on their removal efficiency, performance evaluation and controls high-risk groups is needed.

Korea
There is no certified specification or test standards for HEPA filters sold in the domestic market as of yet.HEPA filter manufacturers and marketers that have inhouse test lab may require all inspection before sales.
Others commission private test labs for an inspection if an outside certification is required.Two KS for domestic HEPA filter are KS A 4812: 2001 high-performance air filter for radioactive aerosol by Korean Agency for Technology and Standards (KATS) and KS B 6740: 1995 air filter performance test method for cleanroom by KATS [4,5].
KS A 4812: 2001 standard is radioactive aerosol with a view to remove nuclear facilities used by the powerful about to be in the fire flame is required, and air filter And allow efficiency, evaluation with a particle DOP (dioctyl phthalate) 0.15 μm [6].KS B 6740: 1995 standards are only distributed in the form of particles 0.3 μm DOP standard is to the Particle Collection with a rate test [7].

England
British is embracing national standards to conform to the standard HEPA filter (EN 1822) of the European Union [8].The European Union have specifications for the HEPA filter of a unified one.Matters concerning a total of five HEPA filters, divided by the specifications and type classification, test methods, measurement equipment, test methods is shown in each standard.The EN 1822 standard test aerosol dos, dop, paraffin oil, and aerosols, size is writing MPPS(Most Penetrating Particle Size).Sampling equipment is used to play Optical counter or Condensation nucleus counter.

United States
There are many HEPA filter standards for using the United States.Each rule all developed for different history of the methods are used has been flouting respectively.The specification used in KS standards, testing institutions and many standards a descendant of HEPA filter of the United States.
In 1956, how dop MIL-STD-282<Filter Unit, Protective Clothing, Gas-mask Components and Related Products> to use was published, Heat the liquid into this standard the test aerosol DOP, superimposes steam and concentrate again make the particles an average of 0.3 μm.
Published the ANSI/UL 586 <Air Filter Units> in 1959.

Korea
Specification of sound pressure machines is based on approval certification that requires(KOSHA Guide H-53-2009) [9-11] 1) HEPA filter installation (higher than 99.97% in DOP removal efficiency), 2) installation of pre-treatment filter in HEPA filter front, 3) installation of filter differential pressure gauge, 4) successful leak test, 5) installation of air blower in filter rear and 6) installation of equipment preventing scattering during mobility.Sound pressure machines should be loaded with HEPA filter (99.97% in removal efficiency) and pass leak test (99.95% in removal efficiency) based on approval certification standards.(Table 1), [12] Sound pressure of an sale in the country to a survey of performance requirements is shown below.Sound pressure flow rate, which is the most important when using a machine sound pressure If I had not displayed in a 42 % at its maximum.Sound pressure often not given leak testing is a 42 % and sound pressure on a bi ban song for the inside flap if they are not installed, and a 58 %.Flow controller 29 % if they are not installed.(Table 2 Test whether the sound pressure machine 4 3

England
Performance of Sound Pressure in England for national standards-BS 8520-2: 2009 Equipment used in the controlled removal of asbestos-containing materials-Part 2: Negative pressure units-Specification [13][14][15].The purpose of this standard HEPA filter to be used, remove asbestos containing materials equipped with portable sound pressure to specify the performance.
Be easy to clean the outer case, apartment area that is signed three times made of plastic welding, head end when moved to the flaps, prevent reflux filter cover, may be able to protect the front wheels and handles, HEPA filter, air inlet Ministry of the wheel, A manometer on the sound-pressure machine specifications show when I was stuck in traffic filters HEPA should be included.
The Carrying yellow dusts shows.According to this standard, should more than 99.7% efficiency HEPA filter and mounted on the sound pressure machine, Maximum leakage should be allowed only 0.005 % from the leakage tests.Leakage test the same grades H a vacuum cleaner as applicable.

United States
a) OSHA class I of working with asbestos rigid an entire engineering standard [11].OSHA law, used asbestos services in the dismantling and removal work, sound pressure specified for information regarding the structure of a particular point about not be, and sound pressure, using a specified.
-of differential pressure measurement.
-flow of air, ease, from worker to perform.
-Install a smoke test to detect the flow and air leakage.b) American National Standards Institute and American Industrial Hygiene Association and portable ventilation system specifications.
American National Standards Institute and the American Industrial Hygiene Association to jointly published by mobile portable some matters were about standards in ventilation systems the specification of Ventilation SystemInclude.

Evaluation of commercial sound pressure machines' one-pass dust collection efficiency
Sound pressure machines commonly used to remove asbestos were used for the evaluation and dust collection efficiency of glass fiber HEPA mounted in sound pressure machines was evaluated.(Figure 1) Affiliations of authors should be typed in italic 8point Arial.They should be preceded by a numerical superscript corresponding to the same superscript after the name of the author concerned.Please ensure that affiliations are as full and complete as possible and include the country.(Figure 2)  The following table presents evaluation of one-pass dust collection efficiency of a sound pressure machine mounted with glass fiber HEPA filter.Efficiency is evaluated by particle size in a commercially-used sound pressure machine.(Table 3)

Study Results
Evaluation of a one-pass dust collection efficiency of a commercial sound pressure machine mounted with glass fiber HEPA filter by particle size indicates dust collection efficiency of 0.3 um in particle size to average at 98.91%.That of 0.5 um and 1.0 um in particle size showed a dust collection efficiency of 99.21% on average and 100%.The dust collection efficiency test is based on KS B 6740 using mono-dispersed 0.3 um DOP particle.Performance evaluation requires particles 0.3um in size to show a dust collection efficiency exceeding 99.97%.Dust collection efficiency for each size in the test shows a statistically significant difference.

Figure 1 .
Figure 1.Commercial sound pressure machine for removing asbestos.

Table 1 .
) Producing sound pressure machine in domestic capacity.

Table 2 .
Domestic performance installation requirements for producing sound pressure machi.
leakage test specifications Household and similar electrical appliance.Safety.Particular requirements for wet and dry vacuum cleaners including power brush for commercial use (BE EN 60335-2.69:2009) in Annex a

Table 3 .
Dust collection efficiency of asbestos-removing sound pressure machine mounted with glass fiber HEPA filter by particle size.