BS 1756-1:1971

Withdrawn

Methods for the sampling and analysis of flue gases Methods of sampling

Available format(s)

Hardcopy , PDF

Withdrawn date

01-06-2005

Language(s)

English

Published date

27-10-1971

Publisher

British Standards Institution

Cooperating organizations
Foreword
Methods
1. Introduction
1.1 Scope
1.2 General
1.3 Definitions
1.4 Types of sample
2. Problems of sampling
2.1 General
2.2 Stratification or variation in composition
2.3 Air inleakage
2.4 Variations in total gas flow
2.5 Velocity distribution across the flue
2.6 Changes in composition during sampling
2.7 Prevention of back diffusion
2.8 Time-lags in sampling systems
2.9 Other difficulties of sampling
3. Selection of a sampling point or points
3.1 General location
3.2 Exact external location
4. Gas sampling apparatus
4.1 Sampling probes
4.2 Types of sampling probe
4.3 Filters
4.4 Aspirators and exhaust pumps
4.5 Traps, seals and excess vacuum reliefs
4.6 Sample containers
4.7 General precautions
5.1 General
5.2 Method for taking a continuous sample at a
constant rate
5.3 Incremental sampling
5.4 Average analysis with variable flow rate
5.5 Multipoint sampling
5.6 Notes on sampling
Figures
1. Apparatus for collecting consecutive gas samples
2. Typical water-cooled sampling probe
3. Heated probe unit with water-cooled jacket
4. A felt pad type of external filter
5. Typical aspirator and exhaust pumps
6. Types of condensate trap
7. Apparatus for taking average samples
8. Multipoint sampling apparatus

This Part is devoted primarily to the general principles to be followed to obtain a representative flue gas sample; the principles apply no matter what the industry or the fuel burning appliance may be. Covers definitions, types of sample, problems of sampling, selection of a sampling point or points and gas sampling apparatus.

Committee	EH/2
DevelopmentNote	Supersedes 91/57229 DC. (03/2006)
DocumentType	Standard
Pages	26
PublisherName	British Standards Institution
Status	Withdrawn
Supersedes	91/57229 DC : NOV 91

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