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Esco Micro Pte Ltd • 21 Changi South Street 1, Singapore 486777 • Tel: +65 6542 0833 • Fax: +65 6542 6920 PowerPoint Presentation
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Esco Micro Pte Ltd • 21 Changi South Street 1, Singapore 486777 • Tel: +65 6542 0833 • Fax: +65 6542 6920 - PowerPoint PPT Presentation


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Fume Hood Containment & Safety Performance. Esco Micro Pte Ltd • 21 Changi South Street 1, Singapore 486777 • Tel: +65 6542 0833 • Fax: +65 6542 6920. Standard Fume Hood. Why we use fume hood?. To contain fumes and hazardous chemicals Ensure Safety of laboratory workers.

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Presentation Transcript
slide1
Fume Hood Containment
  • &
  • Safety Performance

Esco Micro Pte Ltd • 21 Changi South Street 1, Singapore 486777 • Tel: +65 6542 0833 • Fax: +65 6542 6920

slide3

Why we use fume hood?

  • To contain fumes and hazardous chemicals
  • Ensure Safety of laboratory workers
slide4

Face Velocity vs Containment Efficiency

  • Fume hood meets face velocity specification but are not safe.
  • 30-50% of fume hoods meeting face velocity requirements fail tracer gas test. (source: www.safelab.com)
slide5

Existing Standards

  • BS 7258 (United Kingdom, Hong Kong)
  • DIN 12 924 (Germany)
  • EN 14175 (European Union)
  • ANSI/ASHRAE 110-1995 (United States)
  • NF-X-15-203 (France)
  • AS/NZS 8:2006(Australia & New Zealand)
slide7

EN 14175 : 2003

  • Group Effort of 11 European Countries
  • Combination of BS and DIN standards
  • 6 parts:- Part 1: Vocabulary- Part 2: Safety and performance requirements- Part 3: Type test methods- Part 4: On-site test methods- Part 5: Recommendations for installation and maintenance - Part 6: Variable air volume fume cupboards
robustness of containment
Robustness of Containment

EN 14175 : 2003

  • Dynamic Testing: 'Robustness' of Containment Test
  • Test equipment as per outer containment test equipment
  • Flat rectangular plate of 1.9 x 0.4m of thickness 20mm shall be mounted in front of cupboard.
introduction
Introduction

ANSI/ASHRAE 110-1995

  • Method of Testing Performance of Laboratory Fume Hoods.
  • ASHRAE: American Heating, Refrigerating and Air-Conditioning Engineers, Incorporation.
  • “Laboratory Fume Hoods, a Performance Test”, K.J. Caplan and G.W. Kruston, RP-70, ASHRAE Transactions, 1978.
  • First ASHRAE Standard is published on 1985.
test method
Test Method

ANSI/ASHRAE 110-1995

  • Cross draft & face velocity test
  • Smoke visualization test
  • Tracer gas containment test
cross draft face velocity

ANSI/ASHRAE 110-1995

Cross Draft & Face Velocity
  • Cross draft transducer
  • Accuracy: ± 3% of reading
  • Face velocity transducer
  • Accuracy: ± 2% of reading
cross draft measurement

ANSI/ASHRAE 110-1995

Cross draft measurement
  • Cross draft shall be less than 0.15m/s

H

½ H

5 feet

face velocity measurement

ANSI/ASHRAE 110-1995

Face velocity measurement
  • 100% sash opening
  • Face velocity shall be 0.50m/s ± 20%

x

y

≤300mm

≤300mm

slide22

ANSI/ASHRAE 110-1995

x

  • 50% Sash opening
  • 25% Sash opening

1/2y

≤300mm

x

1/4y

≤300mm

flow visualization

ANSI/ASHRAE 110-1995

Flow visualization
  • Enable visual inspection of fume hood air flow patterns.
  • Consist 2 parts:
    • Low volume smoke test
    • High volume smoke challenge
slide27

ANSI/ASHRAE 110-1995

  • SF6 Gas
  • Much heavier than air
  • Non-flammable, non-toxic
  • Tracer gas detector
  • To detect and capture leakage of SF6 from hood.
  • Detection limit: 0.01 PPM
mannequin
Mannequin

ANSI/ASHRAE 110-1995

  • Mannequin height 1.70m, wearing laboratory cloth.
  • Tracer gas detector placed near the mannequin's breathing zone.
static test

ANSI/ASHRAE 110-1995

Static test
  • Tracer gas ejector is placed at 150mm behind the sash.
  • Mannequin placed 75mm in front of sash.
  • Mannequin position will change according to the ejector location.
  • SF6 gas release rate is 4LPM.
  • Data acquisition to record detector reading for 5 mins.
static test30

ANSI/ASHRAE 110-1995

Static test
  • Test is conducted at 100%, 50% and 25% sash opening.
  • Every test is carried out with ejector in 3 positions:
    • Center
    • 300mm from the left
    • 300mm from the right
  • Spillage shall not exceed 0.1ppm, in all test positions.
face hood surface scan

ANSI/ASHRAE 110-1995

Face Hood Surface Scan
  • To observe leakage point of the hood opening.
  • Tracer gas probe is held 1 inch away from the edge of sash opening, and move along the edge with a speed of 3 inch per second.
  • Spillage shall not exceed 0.1ppm, in all test positions.
sash movement effect

ANSI/ASHRAE 110-1995

Sash Movement Effect
  • To test the effect on containment when opening or closing the sash.
  • Sash is moved at a smooth motion between 0.3 – 0.5m/s.
  • Sash movement: Closed → Full opening → Closed, repeat 3 times.
  • Conducted with ejector Located in 3 positions:
    • Center
    • 300mm from the left
    • 300mm From the right
increased severity challenges
Increased Severity Challenges

ESCO Fume Hood

  • Face velocity in 0.50m/s, 0.40m/s, 0.30m/s to test the hood performance.
  • FFU to create cross draft.
increased severity challenges34

ESCO Fume Hood

Increased Severity Challenges
  • Moving vertical board to pretend door open or close.
ashrae test result for efd 4

ESCO Fume Hood

ASHRAE Test Result for EFD-4
  • Face velocity:
    • Sash 100% open: 0.50 m/s
    • Sash 50% open: 0.83 m/s
    • Sash 25% open: 1.15m/s
  • Smoke visualization:
ashrae test result for efd 437

ESCO Fume Hood

ASHRAE Test Result for EFD-4
  • Face hood surface scan
  • Sash movement effect
work safety

Safety Essentials

Work Safety
  • Fume hood is not a storage!
  • Always keep fume hood clean and clear.
  • Action must be taken immediately if spillage happen.
work safety42

Safety Essentials

Work Safety
  • Raise bulky equipment 1-2 inch off the work surface.
  • Place bulky equipment towards the rear of hood and away from the side walls.
work safety43

Safety Essentials

Work Safety
  • Keep sash as low as possible when conducting experiment.
  • Do not block the airfoil.
  • Reduce pedestrian traffic in front of the hood
  • Minimize rapid movement in front of hood.
  • Always keep laboratory windows and doors closed.
work safety44

Safety Essentials

Work Safety
  • Do not use a hood for any function for which it was not intended.
  • Certain chemicals or reactions require specially constructed hoods.
    • Perchloric acid hoods shall be made of stainless steel and equipped with a wash down system.
    • Polycarbonate sash shall be applied when using hydrofluoric acid.
    • Work involving harmful micro-organisms should be done in a biosafety cabinet, rather than a chemical fume hood.
  • Close the sash when finished hood work or leaving experiments or chemicals unattended.