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BS EN ISO 10715:2022

BS EN ISO 10715:2022

$215.11

Natural gas. Gas sampling

Published By Publication Date Number of Pages
BSI 2022 84
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This document gives means for ensuring that samples of natural gas and natural gas substitutes that are conveyed into transmission and distribution grids are representative of the mass to which they are allocated. NOTE      To ensure that a particular gas is taken into account in the standard, please see Annex A. This document is applicable for sampling at sites and locations where interchangeability criteria, energy content and network entry conditions are measured and monitored and is particularly relevant at cross border and fiscal measurement stations. It serves as an important source for control applications in natural gas processing and the measurement of trace components. This document is applicable to natural dry gas (single phase – typically gas transiting through natural gas pipelines) sampling only. On occasion a natural gas flow can have entrained liquid hydrocarbons. Attempting to sample a wet natural gas flow introduces the possibility of extra unspecified uncertainties in the resulting flow composition analysis. Sampling a wet gas (two or three phases) flow is outside the scope of this document. This document does not apply to the safety issues associated with gas sampling.

PDF Catalog

PDF Pages PDF Title
2 undefined
4 European foreword
Endorsement notice
8 Foreword
9 Introduction
11 1 Scope
2 Normative references
3 Terms and definitions
14 4 Safety considerations
5 Principles of sampling
6 The concept of representative sample
15 7 Types of sampling
7.1 Sampling method considerations
16 7.2 Spot sampling
7.2.1 General
7.2.2 Fill-and-empty method
17 7.2.3 Controlled-rate method
7.2.4 Evacuated-cylinder method
7.2.5 Helium pre-fill method
7.2.6 Floating-piston cylinder method
7.2.7 Single cavity sample cylinder
7.2.8 Sampling frequency
19 7.3 Incremental sampling (continuous or composite)
7.3.1 General considerations
7.3.2 Intervals
7.3.3 System considerations
20 7.3.4 Monitoring the filling process
7.3.5 Cylinder tracking
7.3.6 Overpressure protection
7.4 Online or direct sampling
7.4.1 General considerations
22 7.4.2 Automatic drainage
7.4.3 Reducing the pressure
23 7.4.4 Inert-gas purging
7.4.5 Safety/pressure relief valve
7.4.6 Heating of sample line
8 Sampling location
8.1 General
8.2 Sampling place
8.2.1 General
24 8.2.2 Relevant gas
8.2.3 Undisturbed gas
8.2.4 Access
25 8.3 Sampling position
8.4 Sampling point
26 9 Ideal implementation of gas sampling
9.1 General
9.2 Gas sorption
9.2.1 General
27 9.2.2 Surface treatment
9.2.3 Sorption considerations regarding sampling equipment
9.2.4 Equilibrating of sampling equipment
28 9.3 Materials used in sampling
9.3.1 General considerations
29 9.3.2 Steel grades
9.3.3 Epoxy coatings
9.3.4 Other polymers
9.3.5 Rubbers
9.3.6 Bimetallic corrosion
9.4 Sample contamination
9.4.1 Cleanliness
9.4.2 Cleaning sampling systems
30 9.4.3 Pre-charging of sample cylinders
9.5 Sample condensation
9.5.1 Temperature
9.5.2 Pressure reduction and Joule Thomson cooling
32 9.5.3 Condensation and revaporization
34 9.6 Disturbance of the flow through the sampling system
9.7 Delay time
9.7.1 Direct sampling method
35 9.7.2 Indirect sampling method
36 10 Sampling equipment
10.1 General
37 10.2 Probes
10.2.1 General
10.2.2 Straight-tube probe
38 10.2.3 Probe regulator
39 10.2.4 Pitot probe
40 10.3 Tubings
10.3.1 Sampling and sample lines
41 10.3.2 Bypass constructions
10.4 Filters, membranes and separators
42 10.5 Valves and safety valves
43 10.6 Fittings
10.7 Flow monitoring and control
10.8 Pressure reducers
10.9 Pressure sensor/manometers
10.10 Heating devices
44 10.11 Seals and lubricants
10.12 Sample containers or cylinders
10.12.1 General
45 10.12.2 Standard or single cavity cylinder
10.12.3 Floating-piston cylinders or Constant Pressure cylinders
46 10.13 Concentration devices
47 10.14 Number and sequence of equipment
48 11 Verification of the system
49 12 Troubleshooting
51 Annex A (informative) Purposes of sampling, panel of compounds and information in the sampling report
52 Annex B (informative) Procedures for sampling
59 Annex C (informative) Gas sorption effect: adsorption/desorption
60 Annex D (informative) Cleaning of steel sampling cylinders
61 Annex E (informative) Joule-Thomson cooling and phase behaviour
64 Annex F (informative) Vortex shedding and associated problems
68 Annex G (informative) Guidelines for the calculation of the residence time
76 Annex H (informative) Protocol for gas sampling system verification
78 Annex I (informative) Number of samples
80 Bibliography

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BS EN ISO 10715:2022
$215.11