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FLAMMABLE NATURAL GASES FOR INDUSTRIAL AND MUNICIPAL USE
Specifications
GOST 5542-87
STATE STANDARD OF THE USSR UNION
Date of introduction from 01.01.88
This standard applies to natural flammable gases intended as raw materials and fuel for industrial and domestic use.
Mandatory requirements for product quality are set out in clause 1.1 (table, indicators 4, 5, 8), section 2.
The maximum permissible concentration of hydrogen sulfide in the air of the working area is 10 mg/m 3, hydrogen sulfide in a mixture with C 1 -C 5 hydrocarbons is 3 mg/m 3.
1.3.4. Measures and means of protecting workers from the effects of natural gas, requirements for personal hygiene of workers, equipment and premises are regulated by safety rules in the oil and gas industry and safety rules in the gas industry, approved by the USSR State Mining and Technical Supervision.
2.1. Sampling - according to GOST 18917-82.
2.2. Sampling locations, frequency and gas quality control points for compliance with the requirements of this standard are established in agreement with the consumer. In this case, the frequency of monitoring according to the indicators in the table , , as well as the gas moisture dew point should be at least once a month. It is allowed, by agreement with the consumer, not to determine the mass concentration of hydrogen sulfide in gas from fields that do not contain this impurity.
2.3. The results of periodic gas quality tests apply to the volume of gas passed through the pipeline during the period between this and subsequent tests.
2.4. If unsatisfactory test results are obtained for at least one of the quality indicators, repeated tests are carried out for this indicator on a newly selected sample. The results of repeated tests are considered final and apply to the volume of gas that passed through the pipeline during the period between this and the previous test.
3.1. Determination of moisture dew point in gas - according to GOST 20060-83. Determination by other methods and instruments with the same measurement accuracy is allowed.
4.1. Gas is transported through gas pipelines through gas distribution stations and points. Natural flammable gas can be supplied to consumers directly from fields, gas processing plants, main gas pipelines and underground gas storage stations through gas distribution stations and points.
INFORMATION DATA
1. DEVELOPED AND INTRODUCED by the Ministry of Gas Industry of the USSR
DEVELOPERS
A. I. Gritsenko; A. K. Karpov (topic leaders); V. P. Bulychev
2. APPROVED AND ENTERED INTO EFFECT by Resolution of the USSR State Committee for Standards dated April 16, 1987 No. 36
3. INSTEAD GOST 5542-78
4. REFERENCE REGULATIVE AND TECHNICAL DOCUMENTS
|
Item number |
|
|
GOST 12.1.005-88 |
|
FLAMMABLE NATURAL GASES FOR INDUSTRIAL AND MUNICIPAL USE
Specifications
GOST 5542-87
STATE STANDARD OF THE USSR UNION
Date of introductionfrom 01.01.88
This standard applies to natural flammable gases intended as raw materials and fuel for industrial and domestic use.
Mandatory requirements for product quality are set out in clause 1.1 (table, indicators 4, 5, 8), section 2.
1. TECHNICAL REQUIREMENTS
1.1. In terms of physical and chemical indicators, natural flammable gases must comply with the requirements and standards given in the table.
| Indicator name | Test method |
|
| 1. Low heat of combustion, MJ/m 3 (kcal/m 3), at 20°C 101.325 kPa, not less | GOST 10062-75 |
|
| 2. Range of values of the Wobbe number (highest), MJ/m 3 (kcal/m 3) | ||
| 3. Permissible deviation of the Wobbe number from the nominal value, %, no more | ||
| 4. Mass concentration of hydrogen sulfide, g/m 3, no more | ||
| 5. Mass concentration of mercaptan sulfur, g/m 3, no more | ||
| 6. Volume fraction of oxygen, %, no more | GOST 23781-83 |
|
| 7. Mass of mechanical impurities in 1 m 3, g, no more | ||
| 8. Intensity of gas odor at a volume fraction of 1% in air, point, no less |
Notes:
1. By agreement with the consumer, it is allowed to supply gas for energy purposes with a higher content of hydrogen sulfide and mercaptan sulfur through separate gas pipelines.
2. Indicators according to paragraphs. 2, 3, 8 apply only to gas for municipal purposes.
For industrial gas, the indicator according to clause 8 is established by agreement with the consumer.
3. The nominal value of the Wobbe number is set within the norm of the indicator according to paragraph 2 of the table for individual gas distribution systems in agreement with the consumer.
1.2. The moisture dew point at the delivery point must be below the gas temperature.
1.3. The presence of water and hydrocarbons in the liquid phase of gas is not allowed and is optional until 01/01/89.
1.3. Safety requirements
1.3.1. According to their toxicological characteristics, natural flammable gases belong to substances of hazard class 4 according to GOST 12.1.007-76.
1.3.2. Natural flammable gases belong to the group of substances that can form explosive mixtures with air.
Concentration limits of ignition (for methane) in a mixture with air, volume percentages: lower - 5, upper - 15; for natural gas of a specific composition, concentration limits of ignition are determined in accordance with GOST 12.1.044-89.
1.3.3. The maximum permissible concentration (MPC) of natural gas hydrocarbons in the air of the working area is 300 mg/m 3 in terms of hydrocarbons (GOST 12.1.005-88).
The maximum permissible concentration of hydrogen sulfide in the air of the working area is 10 mg/m 3, hydrogen sulfide in a mixture with C 1 -C 5 hydrocarbons is 3 mg/m 3.
1.3.4. Measures and means of protecting workers from the effects of natural gas, requirements for personal hygiene of workers, equipment and premises are regulated by safety rules in the oil and gas industry and safety rules in the gas industry, approved by the USSR State Mining and Technical Supervision.
2. ACCEPTANCE
2.2. Sampling locations, frequency and gas quality control points for compliance with the requirements of this standard are established in agreement with the consumer. In this case, the frequency of monitoring according to the indicators in Table 1, 5-8, as well as the gas moisture dew point, should be at least once a month. It is allowed, by agreement with the consumer, not to determine the mass concentration of hydrogen sulfide in gas from fields that do not contain this impurity.
2.3. The results of periodic gas quality tests apply to the volume of gas passed through the pipeline during the period between this and subsequent tests.
2.4. If unsatisfactory test results are obtained for at least one of the quality indicators, repeated tests are carried out for this indicator on a newly selected sample. The results of repeated tests are considered final and apply to the volume of gas that passed through the pipeline during the period between this and the previous test.
3. TEST METHODS
3.1. Determination of moisture dew point in gas - according to GOST 20060-83. Determination by other methods and instruments with the same measurement accuracy is allowed.
4. TRANSPORTATION
4.1. Gas is transported through gas pipelines through gas distribution stations and points. Natural flammable gas can be supplied to consumers directly from fields, gas processing plants, main gas pipelines and underground gas storage stations through gas distribution stations and points.
INFORMATION DATA
1. DEVELOPED AND INTRODUCED by the Ministry of Gas Industry of the USSR
DEVELOPERS
A. I. Gritsenko; A. K. Karpov(topic leaders); V. P. Bulychev
2. APPROVED AND ENTERED INTO EFFECT by Resolution of the USSR State Committee for Standards dated April 16, 1987 No. 36
3. INSTEAD GOST 5542 - 78
4. REFERENCE REGULATIVE AND TECHNICAL DOCUMENTS
| Item number |
|
| GOST 12.1.005-88 | |
| GOST 12.1.044-89 | |
| GOST 10062-75 | |
The goals, basic principles and basic procedure for carrying out work on interstate standardization are established by GOST 1.0-92 “Interstate standardization system. Basic provisions" and GOST 1.2-2009 "Interstate standardization system. Interstate standards, rules and recommendations for interstate standardization. Rules for development, adoption, application, updating and cancellation"
1. DEVELOPED by the Limited Liability Company "Research Institute of Natural Gases and Gas Technologies - Gazprom VNIIGAZ"
2. INTRODUCED by the Interstate Technical Committee for Standardization MTK 52 “Natural Gas”
3. ADOPTED by the Interstate Council for Standardization, Metrology and Certification (protocol dated May 30, 2014 N 67-P)
4. By Order of the Federal Agency for Technical Regulation and Metrology dated October 9, 2014 No. 1289-st, the interstate standard GOST 5542-2014 was put into effect as the national standard of the Russian Federation on July 1, 2015.
5. INSTEAD GOST 5542-87
Information about changes to this standard is published in the annual information index “National Standards”. and the text from the changes and amendments is in the monthly information index in National Standards.” In the event of a revision (replacement) or cancellation of this standard, the corresponding notice will be published in the monthly information index to the National Standards.” Relevant information, notices and texts are also posted in the public information system - on the official website of the Federal Agency for Lithuanian Regulation and Metrology on the Internet
Date of introduction - 2015—07—01
This standard applies to natural flammable gases supplied to gas distribution systems and used as raw materials and fuel for industrial and domestic purposes.
This standard uses normative references to the following interstate standards:
GOST 8.586.5-2005 State system for ensuring the uniformity of measurements. Measurement of flow and quantity of liquids and gases using standard orifices. Part 5. Measurement procedure
GOST 12.0.004-90 System of occupational safety standards. Organization of occupational safety training. General provisions
GOST 12.1.005-88 System of occupational safety standards. General sanitary and hygienic requirements for the air in the working area
GOST 12.1.007-76 System of occupational safety standards. Harmful substances. Classification and general safety requirements
GOST 12.1.019-79 System of occupational safety standards. Electrical hazard. General requirements and nomenclature of types of protection"
GOST 12.1.044-89 (ISO 4589-84) System of occupational safety standards. Fire and explosion hazard of substances and materials. Nomenclature of indicators and methods for their determination
GOST 12.2.020-76 System of occupational safety standards. Electrical equipment is flameproof. Terms and Definitions. Classification. Marking
GOST 17.2.3.02-78 Nature conservation. Atmosphere. Rules for establishing permissible emissions of harmful substances by industrial enterprises
GOST 10062-75 Natural flammable gases. Method for determining the specific heat of combustion GOST 17310-2002 Gases. Pycnometric method for determining density GOST 20060-83 Natural flammable gases. Methods for determining water vapor content and moisture dew point
GOST 20061-84 Natural flammable gases. Method for determining the dew point temperature of hydrocarbons
GOST 22387.2-97 Natural flammable gases. Methods for determining hydrogen sulfide and mercaptan sulfur
GOST 22387.4-77 Gas for municipal and domestic consumption. Method for determination of resin and dust content
GOST 22387.5-77 Gas for municipal and domestic consumption. Methods for determining odor intensity
GOST 22782.0-81 Explosion-proof electrical equipment. General technical requirements and test methods
"On the territory of the Russian Federation, GOST R 12.1.019-2009 “System of electrical safety standards. Electrical safety. General requirements and nomenclature of types of protection” is in force._ Official publication 1
GOST 22782.5-78 Explosion-proof electrical equipment with explosion protection type. "Intrinsically safe electrical circuit." Technical requirements and test methods
GOST 22782.6-81 Explosion-proof electrical equipment with explosion protection type. "Blastproof enclosure." Technical requirements and test methods
GOST 27193-86 Natural flammable gases. Method for determining the heat of combustion using a water calorimeter
GOST 31369-2008 (ISO 6976:1995) Natural gas. Calculation of calorific value, density, relative density and Wobbe number based on component composition
GOST 31370-2008 (ISO 10715:1997) Natural gas. Guidelines for sampling GOST 31371.1-2008 (ISO 6974-1:2000) Natural gas. Determination of composition by gas chromatography with uncertainty assessment. Part 1: Analysis Guidance
GOST 31371.2-2008 (ISO 6974-2:2001) Natural gas. Determination of composition by gas chromatography with uncertainty assessment. Part 2. Characteristics of the measuring system and statistical evaluation of data
GOST 31371.3-2008 (ISO 6974-3:2000) Natural gas. Determination of composition by gas chromatography with uncertainty assessment. Part 3. Determination of hydrogen, helium, oxygen, nitrogen, carbon dioxide and hydrocarbons to St using two packed columns
GOST 31371.4-2008 (ISO 6974-4:2000) Natural gas. Determination of composition by gas chromatography with uncertainty assessment. Part 4: Determination of nitrogen, carbon dioxide and hydrocarbons C(-C5 and C6) in the laboratory and with an in-line measurement system using two columns
GOST 31371.5-2008 (ISO 6974-5:2000) Natural gas. Determination of composition by gas chromatography with uncertainty assessment. Part 5. Determination of nitrogen, carbon dioxide and hydrocarbons C, -C5 and C6. in the laboratory and for continuous monitoring using three columns
GOST 31371.6-2008 (ISO 6974-6:2002) Natural gas. Determination of composition by gas chromatography with uncertainty assessment. Part 6. Determination of hydrogen, helium, oxygen, nitrogen, carbon dioxide and C,-C8 hydrocarbons using three capillary columns
GOST 31371.7-2008 Natural gas. Determination of composition by gas chromatography with uncertainty assessment. Part 7. Methodology for measuring the molar fraction of components Note - When using this standard, it is advisable to check the validity of the reference standards using the “National Standards” index, compiled as of January 1 of the current year, and according to the corresponding information indexes published in the current year. If the reference standard is replaced (changed), then when using this standard, you should be guided by the replacing (changed) standard. If the reference standard is canceled without replacement, then the provision in which a reference is made to it is applied in the part that does not affect this reference.
This standard uses terms according to GOST 31369. GOST 31370, recommendations. as well as the following term with the corresponding definition:
3.1 flammable natural gas; natural gas; GGP; A gaseous mixture consisting of methane and heavier hydrocarbons, nitrogen, carbon dioxide, water vapor, sulfur-containing compounds, and inert gases.
Notes
1. Methane is the main component of GGP.
2. HGP usually also contains trace amounts of other components.
4.1 In terms of physical and chemical indicators, GGP must comply with the requirements and standards given in Table 1.
4.2 Symbol GGP; “Flammable natural gas for industrial and municipal purposes. GOST 5542-2014".
Table 1. Physico-chemical indicators of GGP for industrial and municipal purposes
| Indicator name | Norm | Test method |
|---|---|---|
| 1 Component composition, molar fraction. % | Not standardized. Definition required | |
| 2 Lower calorific value under standard conditions. MJ/m3 (kcal/m3). no less | 31.80 (7600) | According to 8.2 |
| 3 Range of values of the Wobbe number (highest) under standard conditions. MJ/m3 (kcal/m3) | From 41.20 to 54.50 (from 9840 to 13020) | According to GOST 31369 |
| 4 Deviation of the Wobbe number from the nominal value.% | ±5 | * |
| 5 Mass concentration of hydrogen sulfide, g/m", no more | 0.020 | According to 8.3 |
| 6 Mass concentration of mercaptan sulfur. g/m1, no more | 0.036 | According to 8.3 |
| 7 Mole fraction of oxygen. %. no more | 0.050 | According to GOST 31371.1 - GOST 31371.3. GOST 31371.6. GOST 31371.7 |
| 8 Mole fraction of carbon dioxide. %. no more | 2.5 | According to GOST 31371.1 - GOST 31371.7 |
| 9 Water dew point temperature at pressure at the sampling point. °C | According to 8.4 | |
| 10 Hydrocarbon dew point temperature at pressure at sampling point. °C | Below the GGP temperature at the sampling point | By 8.5 |
| 11 Mass concentration of mechanical impurities, g/m3, no more | 0.001 | According to GOST 22387.4 |
| 12 Density at standard conditions. kg/ml | Not standardized, definition required | According to 8.6 |
| 13 Intensity of the odor of HGP at a volume fraction of 1% in the air, points, not less | 3 | According to GOST 22387.5 |
Notes
1. Standard conditions for carrying out measurements and calculations of indicators 2. 3 and 12 - in accordance with GOST 31369 (Table P.1).
2. When calculating indicators 2 and 3, take 1 cal equal to 4.1868 J.
3. In the Russian Federation, the standard temperature when bringing the volume of GGP to standard conditions is 20 °C.
4. Indicators 2-4 apply only to the GGP. used as fuel.
5. The nominal value of the Wobbe number is set within the norm of indicator 3 for individual gas distribution systems in agreement with the consumer.
6. If the value of any of the indicators 5. 6. 11 during the year does not exceed 0.001 g/m1, then in the future this indicator is determined at least once a year by agreement between the supplier and the consumer.
7. By agreement with the consumer, it is allowed to supply GGP for energy purposes with a higher mass concentration of hydrogen sulfide and mercuric sulfur through separate gas pipelines.
8. By agreement with the consumer, it is allowed to supply GGP with a higher molar fraction of carbon dioxide through separate gas pipelines.
9. For GGP. in which the content of hydrocarbons C.,N|C1 does not exceed 1.0 g/m’, the indicator 10 may not be standardized.
10. Indicator 13 applies only to public utility purposes.
11. For industrial-use GGP, indicator 13 is established by agreement with the consumer.
12. The temperature of the GGP at the sampling point is determined according to GOST 8.586.5. In the Russian Federation, the determination of the GGP temperature is also carried out according to the standard. auto-ignition temperature (for methane) - 537 °C according to standard (6).
5.7. When collecting and transporting samples, as well as conducting laboratory tests, GGPs comply with electrical safety rules in accordance with GOST 12.1.019.
Note- The Russian Federation has a standard.
5.8. Those working with GGP must be trained in labor safety rules in accordance with GOST 12.0.004.
5.9. Sanitary and hygienic requirements for microclimate indicators and the permissible content of harmful substances in the air of the working area must comply with GOST 12.1.005.
5.10. All measuring instruments used in explosive areas must meet explosion safety requirements and have the appropriate types of explosion protection in accordance with GOST 12.2.020. GOST 22782.0. GOST 22782.5. GOST 22782.6.
Note- In the Russian Federation, when working with GGP, the requirements are also observed - (16].
Rules for establishing permissible emissions of GGP into the atmosphere - according to GOST 17.2.3.02.
Note - In the Russian Federation, when working with GGP, the environmental protection requirements specified in sanitary rules and regulations are also observed.
7.1. GGP acceptance is carried out when gas is transferred from the supplier to the consumer in the manner established in the relevant agreement. During acceptance, tests are carried out for compliance of the GGP with the requirements of this standard.
7.2. GGP tests are carried out according to the indicators indicated in Table 1.
7.3. The place of testing in each case is established in an agreement between the parties (supplier and consumer), based on the terms of delivery of the GGP. The frequency of sampling for testing is established according to GOST 31370 (subsection 4.2). The frequency of density measurements to determine the GGP flow rate is determined according to GOST 8.586.5 (subclause 6.4 2.4).
7.4. GGP test methods - in accordance with table 1 and section 8.
7.5. If, according to the test results, the quality of the GGP does not meet the requirements of this standard, then repeat tests are carried out for the indicators for which negative results were obtained. The results of repeated tests are considered final.
7.6. If there are several methods for determining the quality indicator of the GGP, then repeated tests are carried out using the method indicated as arbitration.
7.7. The test results apply to the volume of the GGP. transferred by the supplier to the consumer for the period between this and subsequent tests.
GOST 5542-2014
Notes
1. If necessary, the test results of the GGP are reflected in the quality document (quality certificate).
3. It is allowed to attach test reports for individual indicators, drawn up in any order, to the quality document (quality certificate).
7.8 If disagreements arise between the parties regarding at least one of the GGP quality indicators, joint control tests of the GGP for this indicator are carried out with the participation of representatives of the parties competent in the field of determining this GGP quality indicator.
7.9 The results of control tests are drawn up in the form of a report, one copy for each party participating in the test. The necessary originals or copies of documents may be attached to the act. The act is signed by all representatives of the parties, after which it is prohibited to make changes or additions to it. Representatives who do not agree with the content of the act have the right to express a dissenting opinion in writing. A special opinion is attached to the act and considered in working order.
7.10 If, after joint control tests, disagreements remain between the parties regarding the quality indicator(s) of the GGP, then they are resolved by conducting an independent test. The test is carried out by a third-party independent organization accredited to conduct tests for this indicator. The test is carried out at the initiative of both parties or one of them. The test results are documented in a document signed by all parties and are considered final.
7.11 If the quality of the GGP does not meet the requirements of this standard, the supplier, based on the act, organizes the development and approves an action plan to eliminate the identified violations, taking into account the recommendations set out in the act. A copy of the action plan is sent to the consumer. If the plan's activities are not completed within the agreed time frame for objective reasons, the supplier notifies the consumer of the reasons for their non-fulfillment and the measures taken, indicating the timing of their implementation.
7.12 The procedure for resolving disagreements regarding GGP quality indicators is established in agreements between the supplier and the consumer.
GGP sampling is carried out in accordance with the requirements of GOST 31370.
8.2.1 Determination of the lower calorific value under standard conditions is carried out according to GOST 10062. GOST 27193 or GOST 31369.
8.2.2 If disagreements arise regarding the values of this indicator, the arbitration method is the one set out in GOST 31369.
8.3.1 Determination of the mass concentration of hydrogen sulfide and mercaptan sulfur in GGP is carried out according to GOST 22387.2.
8.3.2 If disagreements arise regarding the values of these indicators, the arbitration method is the photocolorimetric method set out in GOST 22387.2.
Note- In the Russian Federation, the determination of the mass concentration of hydrogen sulfide and mercaptan sulfur is also carried out according to standard (18). If disagreements arise regarding the values of these indicators in the Russian Federation, the arbitration method is the one set out in standard (18).
8.4.1 Determination of the dew point temperature of TTP water at the pressure at the sampling point is carried out according to GOST 20060.
Note- In the Russian Federation, the definition of TTP. carried out according to standard (19).
8.4.2 If disagreements arise regarding the values of this indicator, the arbitration method is the condensation method established in GOST 20060.
Note- If disagreements arise regarding the values of this indicator in the Russian Federation, the arbitration method is the visual condensation method set out in standard (19).
8.4.3 The quality of the GGP meets the requirements of this standard in terms of TTP; in the event that the result of measuring TTR B is lower than the temperature of the GGP by at least the value ∆t1, ºC calculated by the formula
∆t 1 =│∆tr│+│∆TTP B │ (1)
where│∆tr│ is the absolute value of the error of the GTP temperature measuring instrument, ºС;
│∆TTPB│ - absolute value of the error of the measuring instrument TTP B, °C.
Note- When performing TTR measurements. using the visual condensation method according to the standard, the corresponding value of the confidence limits of the error ∆ K (without taking into account the sign) specified in the standard (Table 1) is taken as │∆TTPB│.
8.5.1 Determination of the dew point temperature for hydrocarbons (DTP>B) at the pressure at the sampling point is carried out according to GOST 20061.
Note- In the Russian Federation, the determination of the TTR of hydrocarbons is carried out according to the standard. If disagreements arise regarding the values of this indicator in the Russian Federation, the arbitration method is the visual method set out in the standard.
8.5.2 The quality of the GTP meets the requirements of this standard in terms of TTP of the hydrocarbons if the result of the measurement of TTP of the hydrocarbons is lower than the temperature of the GGP by at least the value ∆t 2, °C calculated by the formula
∆t 2 =│∆t r │+│∆TTR HC │ (2)
where │∆ TTREV │ is the absolute value of the error of the measuring instrument TTR HC, °C.
Note- When measuring the shock absorber TTR by the visual method according to the standard, the corresponding value of the confidence limits of the error ∆k (without taking into account the sign) specified in the standard (Table 1) is taken as │∆SV shock absorber │.
8.6.1 Determination of GGP density under standard conditions is carried out according to GOST 17310 or GOST 31369.
8.6.2 If disagreements arise regarding the values of this indicator, the arbitration method is the one set out in GOST 31369.
Note- When determining the quality indicators of the GGP, it is allowed to use other measurement methods certified in the established order, which are not inferior in their characteristics to the methods specified in this section.
Transportation of GGP is carried out through gas distribution pipelines through gas distribution stations and points. Gas can be supplied to consumers directly from field treatment plants, gas processing plants, main gas pipelines and underground storage facilities through gas distribution stations and points.
The supplier guarantees compliance of the quality of the GGP with the requirements of this standard based on test results for the period until the next test.
Name of the company or organization that issued the passport
QUALITY DATA SHEET No._
Natural flammable gas, GOST 5542 - 2014 OKP code 02 7110
Supplier Legal address
Delivery date (period)
Date (period) of sampling
Sampling location
Date (period) of testing
Test results of natural combustible gas
Conclusion:
On the compliance of natural combustible gas with the requirements of this standard
Responsible for testing ____________________ /Decoding of signature/
Date: "__"_______________201_ M.P.
Standard of OJSC Gazprom STO Gazprom 5.2-2005 Ensuring uniformity of measurements. Consumption and quantity of natural gas. Methodology for performing measurements using ultrasonic flow transducers
Metrology Rules PR 50.2.019-2006 State system for ensuring the uniformity of measurements. Methodology for performing measurements using turbine, rotary and vortex counters Maximum permissible concentrations (MPC) of harmful substances in the air of the working area
GN 2.2.5.1313-03 Hygienic standards of the Ministry of Health of Russia Maximum permissible concentrations (MPC) of harmful substances in the air of the working area
(5) GOST R 51330.5-99 Explosion-proof electrical equipment. Part 4: Method for determining ignition temperature (IEC 60079-4-75)
(6) GOST R 51330.19-99 Explosion-proof electrical equipment. Part 20: Data on flammable gases and vapors relevant to the operation of electrical equipment
GOST R 12.1.019-2009 System of occupational safety standards. Electrical hazard. General requirements and nomenclature of types of protection (IEC 60079-20-96)
GOST R 51330.0-99 (IEC 60079-0-98) Explosion-proof electrical equipment. Part 0. General requirements
GOST R 51330.1-99 (IEC 60079-1 -98) Explosion-proof electrical equipment. Part 1. Explosion protection of the “flame-proof enclosure” type
GOST R 51330.10-99 (IEC 60079-11-99) Explosion-proof electrical equipment. Part 11. Intrinsically safe electrical circuit i
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