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eLibrary > NFPA 270: Standard Test Method for Measurement of Smoke Obscuration Using a Conical Radiant Source in a Single Closed Chamber >

NFPA 270: Standard Test Method for Measurement of Smoke Obscuration Using a Conical Radiant Source in a Single Closed Chamber, 2023

NFPA Standards are copyright of National Fire Protection Association (NFPA). NFPA Standards are reproduced with NFPA's permission by MADCAD.com. NFPA and the NFPA logos are trademarks and service marks of NFPA. All rights reserved.

NFPA 270: Standard Test Method for Measurement of Smoke Obscuration Using a Conical Radiant Source in a Single Closed Chamber, 2023

Chapter 1 Administration [Go to Page]
1.1 Scope.
1.2 Purpose. (Reserved)
1.3 Application.
1.4 Units and Formulas.
Chapter 2 Referenced Publications [Go to Page]
2.1 General.
2.2 NFPA Publications. (Reserved)
2.3 Other Publications.
2.4 References for Extracts in Mandatory Sections. (Reserved)
Chapter 3 Definitions [Go to Page]
3.1 General.
3.2 NFPA Official Definitions.
3.3 General Definitions.
Chapter 4 Test Apparatus [Go to Page]
4.1 General.
4.2 Test Chamber.
4.3 Sample Support and Heating Arrangements.
4.4 Gas Supply.
4.5 Photometric System.
4.6 Chamber Leakage.
4.7 Cleaning Materials.
4.8 Ancillary Equipment.
Chapter 5 Test Environment [Go to Page]
5.1 Light Interference.
5.2 Product of Combustion Venting.
5.3 Operator Safety.
Chapter 6 Test Specimen [Go to Page]
6.1 Suitability of Sample for Testing.
6.2 Sample Face.
6.3 Number of Specimens.
6.4 Additional Specimens.
6.5 Size of Specimens.
6.6 Specimen Preparation.
6.7 Wrapping of Specimens.
Chapter 7 Setup, Calibration, and Maintenance [Go to Page]
7.1 Setup and Calibration Procedures.
7.2 Alignment of Photometric System.
7.3 Selection of Compensating Filter(s).
7.4 Linearity Check.
7.5 Calibration of Range-Extension Filter.
7.6 Chamber Leakage Rate Test.
7.7 Burner Calibration.
7.8 Radiator Cone Calibration.
7.9 Cleaning.
7.10 Frequency of Checking and Calibrating Procedures.
7.11 Total System.
Chapter 8 Conditioning [Go to Page]
8.1 Pre-Test.
8.2 Conditioning.
Chapter 9 Test Procedure [Go to Page]
9.1 Initial Conditions.
9.2 Tests with Pilot Flame.
9.3 Preparation of Photometric System.
9.4 Loading Specimen.
9.5 Recording of Light Transmission.
9.6 Observations.
9.7 Termination of Test.
9.8 Specimen Mass.
9.9 Repeat Tests.
Chapter 10 Calculations [Go to Page]
10.1 Specific Optical Density, Ds.
10.2 Clear Beam Correction Factor, Dc.
10.3 Mass Loss.
Chapter 11 Test Report [Go to Page]
11.1 Descriptive Information.
11.2 Test Results.
Annex A Explanatory Material
Annex B Precision and Bias
Annex C Interlaboratory Application
Annex D Determination of Mass Optical Density
Annex E Informational References [Go to Page]

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NFPA 270: Standard Test Method for Measurement of Smoke Obscuration Using a Conical Radiant Source in a Single Closed Chamber, 2023

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