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GB/T 19204-2003 PDF in English


GB/T 19204-2003 (GB/T19204-2003, GBT 19204-2003, GBT19204-2003)
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GB/T 19204-2003: PDF in English (GBT 19204-2003)

GB/T 19204-2003
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 75.060
E 24
General characteristics of liquefied natural gas
ISSUED ON. JUNE 18, 2003
IMPLEMENTED ON. DECEMBER 01, 2003
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People’s Republic of China
Table of Contents
Foreword . 3
CEN foreword . 4
1 Scope .. 5
2 Normative references . 5
3 Term and definition .. 5
4 Abbreviations . 5
5 General characteristics of LNG . 6
6 Materials of construction .. 13
7 Health and safety .. 15
Annex A (informative) Bibliography . 18
Annex B (informative) Materials that can be used in contact with LNG . 21
Foreword
This Standard is equivalent to CEN BS EN 1160.1997 “Installations and
equipment for liquefied natural gas - General characteristics of liquefied natural
gas”.
In order to facilitate user access to the original text, the typesetting of this
Standard is basically the same as the original text, and no changes have been
made. In order to ensure the implementation of the standard, English (original
text) annotations are given to the parts that are liable to confusion.
Regarding the unit of measurement, this Standard is mainly based on legal
units of measurement, that is, the value of legal units of measurement precedes,
and the corresponding value of non-statutory units of measurement is indicated
in parentheses following it.
Annex A and Annex B of this Standard are informative annexes.
This Standard was proposed by China National Offshore Oil Corporation.
This Standard is under the jurisdiction of China Natural Gas Standardization
Technology Committee.
Drafting organizations of this Standard. Development and Design Institute of
CNOOC Research Center, Natural Gas Research Institute of PertroChina
Southwest Oil & Gasfield Branch Company, East China Investigation and
Design Institute of China National Petroleum Corporation, Zhongyuan Oilfield
Branch Company of China Petroleum & Chemical Corporation.
Main drafters of this Standard. Fu Yuhua, Zhang Bangying, Xu Xiaoming, Wu
Ying, Luo Qin.
General characteristics of liquefied natural gas
1 Scope
This Standard gives guidance on the characteristics of liquefied natural gas
(LNG) and the cryogenic materials used in the LNG industry. This Standard also
gives guidance on health and safety matters. This Standard is intended to act
as a reference document for the implementation of other standards of CEN/TC
282 (Installations and equipment for liquefied natural gas). This Standard is
intended as a reference for use by persons who design or operate LNG facilities.
2 Normative references
The following documents contain the provisions which, through reference in this
Standard, become the provisions of this Standard. For dated references, their
subsequent amendments (excluding corrigendum) or revisions do not apply to
this Standard. However, the parties who enter into agreement based on this
Standard are encouraged to investigate whether the latest versions of these
documents are applicable. For undated reference documents, the latest
versions apply to this Standard.
EN 1473 Installation and equipment for liquefied natural gas - Design of on-
shore installation.
3 Term and definition
For the purposes of this Standard, the following term and definition apply.
liquefied natural gas
A colorless fluid in the liquid state composed predominantly of methane and
which may contain minor quantities of ethane, propane, nitrogen or other
components normally found in natural gas.
4 Abbreviations
For the purposes of this Standard, the following abbreviations apply.
- LNG liquefied natural gas;
- RPT rapid phase transition;
- BLEVE boiling liquid expanding vapor explosion;
- SEP surface emissive power.
5 General characteristics of LNG
5.1 Introduction
It is recommended that all personnel concerned with the handling of LNG
should be familiar with both the characteristics of the liquid and the gas
produced. The potential hazard in handling LNG stems mainly from three
important properties.
a) LNG is extremely cold. At atmospheric pressure, depending upon
composition, it boils at about -160 °C. At this temperature the vapor is
more dense than ambient air (see examples in Table 1);
b) very small quantities of LNG liquid are converted into large volumes of
gas. One volume of LNG produces approximately 600 volumes of gas
(see examples in Table 1);
c) natural gas, similar to other gaseous hydrocarbons, is flammable. At
ambient conditions the flammable mixture range with air is from
approximately 5 % to 15 % gas by volume.
5.2 Properties of LNG
5.2.1 Composition
LNG is a mixture of hydrocarbons composed predominantly of methane and
which can contain minor quantities of ethane, propane, nitrogen or other
components normally found in natural gas.
The physical and thermodynamic properties of methane and other components
of natural gas can be found in reference books (see Annex A) and
thermodynamic calculation codes.
For the purpose of this Standard, LNG shall have a methane content of more
than 75 % and a nitrogen content of less than 5 %.
Although the major constituent of LNG is methane, it shall not be assumed that
LNG is pure methane for the purpose of estimating its behavior.
When analyzing the composition of LNG special care shall be taken to obtain
representative samples not causing false analysis results due to distillation
......
 
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