Graham Bostock: ISO Test Methods

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Transcript Graham Bostock: ISO Test Methods

Graham Bostock Convenor ISO TC94/SC15/WG1/PG4

     ISO TC94 – Technical Committee: PPE SC15 – Sub-Committee: Respiratory Protection WG1 – Working Group 1: General PG4 – Project Group 4: Test Methods ◦ ◦ ◦ CD: Committee Draft DIS: Draft International Standard FDIS: Final Draft International Standard

       Part 1 – Inward Leakage Part 2 – Breathing Resistance Part 3 – Particle Filter Penetration Part 4 – Gas and Vapour Filter Testing Part 5 – Tools Part 6 – Mechanical Tests Part 7 – Practical Performance

       Part 8 – Flow Measurement Part 9 – Rebreathed Carbon Dioxide Part 10 – Flame and Heat Part 11 – Field of Vision Part 12 – Work of Breathing Part 13 – Regenerating Breathing Apparatus Part 14 – Sound

   ◦ ◦ ◦ ◦ NaCl, Corn Oil or SF 6 challenges.

Panel of 25 test subjects selected by facial dimensions.

Extended exercise regime to include: Reaching up and down.

Squatting.

Hands and knees.

18 minutes duration

  ◦ First part to be published.

Needs to be revised / updated.

Uses EN headform.

    NaCl and Paraffin Oil mist challenges.

Flame photometry and scattered light detectors.

Flow rates 85 l/min and 135 l/min.

Exposure to 150 mg of the challenge aerosol.

 ISO F1 F2 F3 F4 F5 20% 5% 1% 0.1% 0.01% EN FFP1/P1 FFP2/P2 FFP3 TH3 P3 20% 6% 1% 0.2% 0.05%

  Sodium Chloride Aerosol the number median of particle size distribution is between 0,06 µm and 0,10 µm electromobility diameter, with a geometric standard deviation between 1,4 and 1,8; the aerosol concentration is within the range 8 mg/m 3 to 35 mg/m 3 ;

  Paraffin Oil Mist The number median of particle size distribution is between 0,16 µm and 0,21 µm electromobility diameter, with a geometric standard deviation between 1,4 and 1,8; the aerosol concentration is within the range 15 mg/m 3 to 35 mg/m 3 ;

   Gas capacity test – 30 l/min Gas filter validation test at specified flow rates ◦ Gas and combined filters are exposed to a defined test gas under enhanced flow rates to evaluate whether breakthrough time exceeds a specified minimum.

Migration and Desorption tests

   ◦ Extended range of test gases.

OV, OG, AC, BC, NOX ◦  AC: SO 2 /Cl 2 /H 2 S Low capacity class 1 OV challenges    300 ppm 1000 ppm 3000 ppm  6000 (9000) ppm High and low humidities.

   Head forms.

Torso ◦ ◦ ◦ Breathing machines / Metabolic simulators.

Required performance parameters.

Sinusoidal.

Fixed displacements of 1.0, 1.5, 2.0, 2.5 and 3.0 litres.

      Bending Crushing Kinking Drop Tensile Rough handling

        Walk Crawl Climb Shovel Lift Roll Read Communicate

   ◦ Assisted Filtering Devices.

Sensitive to back pressure.

◦ Zero back pressure method.

Plastic bag.

◦ ◦ Interactive Flow Rate.

Flow varies with breathing pattern.

Measure pressure drop across the filter as a function of flow.

•  ◦ ◦ 3 Test Methods Method 1 similar to present EN. Main and auxiliary cylinders.

◦ Single breathing tube / ISO headform

Measure at 10 l/min as worst case.

To be resolved

    ◦ ◦ Retain single and six burner tests.

Hot wire test.

◦ Penetration by hot particles.

Radiant heat test.

Levels 1 and 2 extended arrays.

Level 3 Manikin test based on ISO 13506.

◦ Flame engulfment.

Extended burners.

 Displacement

  Also known as closed circuit breathing apparatus.

◦ ◦ ◦ ◦ ◦ Specifies setting for measuring performance Tidal volume and frequency: to be changed during the test.

Carbon dioxide supply Oxygen consumption Temperature Humidity

   ◦ ◦ Measurement of unwanted sound – Noise.

Measurement of wanted sound – Warning device.

Use a head form Higher value but more repeatable.

Small microphones mounted in flat “ear”.

Questions?