BS 1756-1:1971
Withdrawn
A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.
Hardcopy , PDF
01-06-2005
English
27-10-1971
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
Access your standards online with a subscription
Features
-
Simple online access to standards, technical information and regulations.
-
Critical updates of standards and customisable alerts and notifications.
-
Multi-user online standards collection: secure, flexible and cost effective.