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GB/T 31975-2015

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标准编号: GB/T 31975-2015 (GB/T31975-2015)
中文名称: 呼吸防护用压缩空气技术要求
英文名称: Technical requirements of compressed air for respiratory protection
行业: 国家标准 (推荐)
中标分类: C73
国际标准分类: 13.340.30
字数估计: 7,794
发布日期: 2015-09-11
实施日期: 2016-10-01
引用标准: GB/T 3863-2008; GB/T 5832.2; GB/T 8984; GB/T 18204.2-2014
起草单位: 中国安全生产科学研究院
归口单位: 全国个体防护标准化技术委员会
标准依据: 国家标准公告2015年第25号
提出机构: 国家安全生产监督管理总局
发布机构: 中华人民共和国国家质量监督检验检疫总局、中国国家标准化管理委员会
范围: 本标准规定了呼吸防护用压缩空气的质量指标和测试方法。本标准适用于职业防护用和逃生用的自给开路式压缩空气呼吸器、压缩空气长管呼吸器。本标准不适用于医疗用压缩空气, 潜水用呼吸装备和航空呼吸装备用的压缩空气。

GB/T 31975-2015
Technical requirements of compressed air for respiratory protection
ICS 13.340.30
C73
中华人民共和国国家标准
呼吸防护用压缩空气技术要求
2015-09-11发布
2016-10-01实施
中华人民共和国国家质量监督检验检疫总局
中国国家标准化管理委员会发布
前言
本标准按照GB/T 1.1-2009给出的规则起草。
本标准由国家安全生产监督管理总局提出。
本标准由全国个体防护标准化技术委员会(SAC/TC112)归口。
本标准起草单位:中国安全生产科学研究院、总装备部防化研究院、总后勤部军需装备研究所、梅思
安(中国)安全设备有限公司、德尔格安全设备(中国)有限公司。
本标准主要起草人:张明明、丁松涛、傅雅慧、董会君、姚海锋、常虹、杨小兵、张惠军、朱华。
呼吸防护用压缩空气技术要求
1 范围
本标准规定了呼吸防护用压缩空气的质量指标和测试方法。
本标准适用于职业防护用和逃生用的自给开路式压缩空气呼吸器、压缩空气长管呼吸器。
本标准不适用于医疗用压缩空气,潜水用呼吸装备和航空呼吸装备用的压缩空气。
2 规范性引用文件
下列文件对于本文件的应用是必不可少的。凡是注日期的引用文件,仅注日期的版本适用于本文
件。凡是不注日期的引用文件,其最新版本(包括所有的修改单)适用于本文件。
GB/T 3863-2008 工业氧
GB/T 5832.2 气体中微量水分的测定 第2部分:露点法
GB/T 8984 气体中一氧化碳、二氧化碳和碳氢化合物的测定 气相色谱法
GB/T 18204.2-2014 公共场所卫生检验方法 第2部分:化学污染物
3 术语和定义
下列术语和定义适用于本文件。
3.1
露点 dewpoint
在恒定压力下,气体中所含水分达到饱和并凝结成露或霜(冰)时的温度。
3.2
露点法 dewpointmethod
通过测试气体的露点来反映压缩空气中水分含量的方法。
3.3
常压露点 atmosphericdewpoint
通常大气压力下测得的压缩空气露点。
4 技术要求
呼吸防护用压缩空气质量应符合表1中各项指标的要求。
表1 呼吸防护用压缩空气质量指标
质量指标 指标要求a
氧气(O2) 19.5%(体积分数)~23.5%(体积分数)
一氧化碳(CO) ≤10mL/m3
二氧化碳(CO2) ≤1000mL/m3
表1(续)
质量指标 指标要求a
露点 ≤ -45.6℃
油雾与颗粒物 ≤5.0mg/m3
异味 无明显异味
a 各项指标要求均是在标准状态下(20℃,101.3kPa)的数值。
5 测试方法
5.1 氧气的测定
5.1.1 压缩空气中氧气含量的测定宜采用铜氨溶液吸收法,按GB/T 3863-2008中4.2规定执行;
5.1.2 压缩空气中氧气含量也可采用顺磁式分析仪、电化学式分析仪等仪器分析方法进行测定,仪器
精度至少为±0.2%氧气(绝对值)。
5.2 一氧化碳的测定
5.2.1 一氧化碳含量的测定可采用催化甲烷化气相色谱法,按GB/T 8984的规定执行;
5.2.2 一氧化碳含量的测定也可采用不分光红外线气体分析法,按GB/T 18204.2-2014中3.1规定
执行。
5.3 二氧化碳的测定
5.3.1 二氧化碳含量的测定可采用催化甲烷化气相色谱法,按GB/T 8984的规定执行;
5.3.2 二氧化碳含量的测定也可采用不分光红外线气体分析法,按GB/T 18204.2-2014中4.1规定
执行。
5.4 油雾与颗粒物的测定
油雾与颗粒物含量的样品采集和测定采用滤膜称量法,按附录A规定的方法进行。
5.5 露点的测定
露点的测定按GB/T 5832.2的规定执行。
6 气态样品的采集要求
不方便现场测试时,应按照以下要求进行气态样品的采集:
a) 所采集的气态样品应能代表正常生产供应的压缩空气;
b) 应在同一时间、在同一个充装位置上、以同样的方式充装样品容器;
c) 应通过适当的连接从同一个供气容器内采集气体到样品容器内,供气容器和样品容器之间不
宜连接调节器(允许使用一个控制阀);
d) 应经过适当的压力调整,将样品容器直接连接到分析设备,同时应避免分析设备承压过大。
附 录 A
(规范性附录)
压缩空气中油雾与颗粒物的检测方法
气样中油雾与颗粒物用已知质量的滤膜采集,由采样后滤膜的增重及采集气体体积,计算出压缩空
气中油雾与颗粒物的含量。
A.2 仪器和材料
方法所需的仪器和材料主要包括:
a) 滤膜:过氯乙烯微孔滤膜或其他测尘滤膜,直径37mm或40mm,孔径不大于1μm;
b) 采样夹或采样盒:尺寸与滤膜相符,用于夹持微孔滤膜;
c) 气体针形阀和连接用的塑胶管;
d) 流量计,精度为2%;
e) 分析天平:精确到0.1mg。
采样前应做好如下准备工作:
a) 将采样夹和采样盒洗净烘干;
b) 将滤膜放在干燥器中脱水至少4h,称量质量m1(精确到0.1mg),放入已编号的滤膜盒,称量
后的滤膜不要沾染、吸附油和粉尘;
c) 将针形阀、采样夹、转子流量计依次用塑胶管连接起来。
A.4 样品采集
A.4.1 将压缩空气气瓶或供气设备的出口压力调节在0.1MPa~0.12MPa(绝对压),然后将针形阀的
进气口与压缩空气设备出口连接。在针形阀关闭的情况下,将滤膜盒装入滤膜盒夹持器。开启针形阀
并调节流量计,让气体以10L/min~20L/min的流速V 通过滤膜,使气体流量稳定,记录采样的开始
A.4.2 当累积流量达到1m3 以上时,关闭针形阀,记录采样的结束时间。取出滤膜,将滤膜的接尘面
朝里对折两次,置于清洁容器内运输和保存。运输和保存过程中应防止粉尘脱落或污染。
A.4.3 从压力容器采样时,在采样前应将压力容器颠倒放置(阀门朝下)5min。气瓶和组份应保持在
0℃以上。
A.4.4 在对压缩机系统进行采样时,压缩气出口或与其连接的过滤干燥管应当保持下垂。油份测量
时,应当使样品空气通过充足的滤膜介质,然后测量滤膜的增重,或者观察滤膜的脱色变化情况。
A.5 样品称量与结果处理
A.5.1 称量前,将采样后的滤膜放置在干燥器中脱水4h以上,除静电后,在分析天平上准确称量,记
录滤膜和粉尘的质量m2。在采样前、后滤膜称量时天平室的相对湿度之差不超过10%。
x=
m2-m1
(A.1)
式中:
x ---油雾与颗粒物含量,单位为毫克每立方米(mg/m3);
m2 ---采样后的滤膜质量,单位为毫克(mg);
m1 ---采样前的滤膜质量,单位为毫克(mg);
V ---采样体积(换算为标准状态下20℃和101.3kPa),单位为立方米(m3)。
A.5.3 同一采样点平行采集样品数应不少于2个,同一批次样品应至少包含一个空白样品,各样品测
参 考 文 献
[1] ISO 8573-1Compressedair-Part1:Contaminantsandpurityclasses
[2] ISO 8573-2Compressedair-Part2:Testmethodsforaerosoloilcontent
[3] ISO 8573-3Compressedair-Part3:Testmethodsformeasurementofhumidity
[4] ISO 8573-4Compressedair-Part4:Testmethodsforsolidparticlecontent
[5] ISO 8573-5Compressedair-Part5:Determinationofoilvapourandorganicsolventcon-
tent
[6] ISO 8573-6Compressedair-Part6:Determinationofcontentofgaseouscontaminantcon-
tent
[8] EN12021:1998Respiratoryprotectivedevices-Compressedairforbreathingapparatus
[9] NFPA1989-2008Standardonbreathingairqualityforemergencyservicesrespiratorypro-
tection
[10] 29CFRPart1910.134RespiratoryProtection

GB/T 31975-2015
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 13.340.30
C 73
Technical Requirements of Compressed Air for
Respiratory Protection
呼吸防护用压缩空气技术要求
ISSUED ON: SEPTEMBER 11, 2015
IMPLEMENTED ON: OCTOBER 01, 2016
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Terms and Definitions ... 4
4 Technical Requirements ... 5
5 Test Methods ... 5
6 Collecting Requirements for Gaseous Samples ... 6
Appendix A (Normative) Test Methods of Oil Mist and Particulate Matter in the
Compressed Air ... 7
Bibliography ... 10
Foreword
This Standard was drafted as per the rules specified in GB/T 1.1-2009.
This Standard was proposed by State Administration of Work Safety.
This Standard shall be under the jurisdiction of National Technical Committee for
Standardization of Personal Protection (SAC/TC 112).
Drafting organizations of this Standard: China Academy of Safety Science and
Technology; Research Institute of Chemical Defense, General Armaments Department;
Quartermaster Equipment Research Institute of the General Logistic Department; MSA
(China) Safety Equipment Co., Ltd.; and Draeger Safety Equipment (China) Co., Ltd.
Chief drafting staffs of this Standard: Zhang Mingming, Ding Songtao, Fu Yahui, Dong
Huijun, Yao Haifeng, Chang Hong, Yang Xiaobing, Zhang Huijun, and Zhu Hua.
Technical Requirements of Compressed Air for
Respiratory Protection
1 Scope
This Standard specifies the quality indicators and test methods of compressed air for
respiratory protection.
This Standard is applicable to self-contained open-circuit compressed air breathing
apparatus and compressed air line breathing apparatus for occupational protection
and escape.
This Standard is not applicable to compressed air for medical use, breathing
equipment for diving and compressed air for aviation breathing equipment
2 Normative References
The following documents are essential to the application of this document. For the
dated documents, only the versions with the dates indicated are applicable to this
document; for the undated documents, only the latest version (including all the
amendments) are applicable to this document.
GB/T 3863-2008 Industrial Oxygen
GB/T 5832.2 Determination of Moisture in Gases - Part 2: Dew Point Method
GB/T 8984 Determination of Carbon Monoxide Carbon Dioxide and Hydrocarbon
in Gases - Gas Chromatographic Method
GB/T 18204.2-2014 Examination Methods for Public Places - Part 2: Chemical
Pollutants
3 Terms and Definitions
For the purpose of this document, the following terms and definitions apply.
3.1 Dew point
At constant pressure, the temperature at which the moisture in the gas reaches
saturation and condenses into dew or frost (ice).
3.2 Dew point method
A method of measuring the dew point of the gas to reflect the moisture content of
compressed air.
3.3 Atmospheric dew point
Dew point of compressed air measured at atmospheric pressure.
4 Technical Requirements
The quality of compressed air for respiratory protection shall meet the requirements of
various indicators in Table 1.
Table 1 -- Quality Indicators of Compressed Air for Respiratory Protection
5 Test Methods
5.1 Determination of oxygen
5.1.1 The determination of the oxygen content in compressed air should adopt the
copper ammonia solution absorption method, and implement according to the
provisions of 4.2 in GB/T 3863-2008;
5.1.2 The oxygen content in the compressed air may also be measured by
paramagnetic analyzers, electrochemical analyzers and other instrumental analysis
methods. The accuracy of the instrument is at least ±0.2% oxygen (absolute value).
5.2 Determination of carbon monoxide
Oxygen
Carbon monoxide
Carbon dioxide
19.5% (volume fraction) ~ 23.5% (volume fraction)
Quality indicators Indicator requirements a
Dew point
Oil mist and particulate matter
Peculiar smell No obvious peculiar smell
a The requirements for each indicator is the value under the standard state (20°C, 101.3 kPa).
methanation gas chromatography, and implement in accordance with the provisions of
GB/T 8984;
5.2.2 The determination of carbon monoxide content may also use non-spectroscopy
infrared gas analysis method, and implement according to 3.1 in GB/T 18204.2-2014.
5.3 Determination of carbon dioxide
5.3.1 The determination of carbon dioxide content may adopt the catalytic methanation
gas chromatography, and implement in accordance with the provisions of GB/T 8984;
5.3.2 The determination of carbon dioxide content may also use non-spectroscopy
infrared gas analysis method, and implement according to 4.1 in GB/T 18204.2-2014.
The sample collection and determination of oil mist and particulate matter content shall
filter adopt the filter weighing method, and implement in accordance with the method
specified in Appendix A.
5.5 Determination of dew point
The determination of the dew point is performed in accordance with the provisions of
GB/T 5832.2.
6 Collecting Requirements for Gaseous Samples
When on-site testing is not convenient, gaseous samples shall be collected in
accordance with the following requirements:
supplied by normal production;
b) Sample containers shall be filled at the same time and in the same filling position
in the same way;
c) The gas shall be collected from the same gas supply container into the sample
container through an appropriate connection; and the regulator shall not be
connected between the gas supply container and the sample container (allowing
the use of a control valve);
d) The sample container shall be directly connected to the analysis equipment after
appropriate pressure adjustments. At the same time, the analysis equipment
Appendix A
(Normative)
Test Methods of Oil Mist and Particulate Matter in the Compressed
Air
A.1 Principle
The oil mist and particulate matter in the gas sample shall be collected with a filter
membrane of known quality. The content of the oil mist and particulate matter in the
compressed air shall be calculated from the weight gain of the filter membrane and the
volume of the collected gas after sampling.
The instruments and materials required for the method include:
a) Filter membrane: perchloroethylene microporous filter membrane or other dust
measurement filter membrane, diameter 37mm or 40mm, and pore diameter no
greater than 1μm;
b) Sampling clip or sampling box: the size is consistent with the filter membrane,
which is used to hold the microporous filter membrane;
c) gas needle valve and rubber-plastic tube for connection;
d) flow meter with accuracy of 2%;
e) Analytical balance: accurate to 0.1 mg.
The following preparations shall be made before sampling:
a) Wash and dry the sampling clamp and sampling box;
b) Dewater the filter membrane in a desiccator for at least 4h; weigh the mass, m1,
(accurate to 0.1mg); and put it into the numbered filter box. The weighed filter
membrane shall not be contaminated or adsorb oil or dust;
c) Connect the needle valve, sampling clamp and rotor flowmeter with plastic pipes
in order.
A.4 Sample collection
A.4.1 Adjust the outlet pressure of the compressed air cylinder or air supply equipment
valve to the outlet of the compressed air equipment. With the needle valve closed,
insert the filter box into the filter box holder. Open the needle valve and adjust the flow
meter to allow the gas to pass through the filter membrane at a flow rate, V, of 10L/min
~ 20L/min to stabilize the gas flow and record the start time of sampling.
A.4.2 When the cumulative flow rate exceeds 1m3, close the needle valve and record
the end time of sampling. Take out the filter membrane, fold the dust-receiving side of
the filter membrane inward twice and place it in a clean container for transportation
and storage. During the transportation and storage process, prevent the dust falling off
or pollution.
upside down (valve facing down) for 5min before sampling. Gas cylinders and
components shall be kept above 0°C.
A.4.4 When sampling the compressor system, the compressed gas outlet or the filter
drying pipe connected to it shall keep hanging. When measuring the oil content, the
sample air shall be passed through a sufficient filter membrane medium; and then the
weight gain of the filter membrane shall be measured, or the decolorization of the filter
membrane shall be observed.
A.5 Sample weighing and result processing
A.5.1 Before weighing, place the sampled filter membrane in a desiccator to dewater
analytical balance and record the mass, m2, of the filter membrane and dust. The
difference between the relative humidity of the balance chamber before and after the
sampling of the membrane filter is no more than 10%.
A.5.2 The content of oil mist and particulate matter in the gas is calculated according
to Formula (A.1):
Where:
x - oil mist and particulate matter content, in mg/m3;
m2 - the mass of the filter membrane after sampling, in mg;
m1 --- the mass of the filter membrane before sampling, in mg;
A.5.3 The number of parallel samples collected at the same sampling point shall be no
less than 2. The same batch of samples shall contain at least one blank sample. The
test results of each sample shall be deducted from the blank value. The final result is
the average value of each parallel sample.
Bibliography
__________ END __________
   
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