This standard applies to the construction of oil and gas fields, new construction and expansion of pipelines. SY/T 0025-1995 Classification of electrical installations in petroleum facilities SY/T0025-1995 Standard download decompression password: www.bzxz.net

Petroleum and Natural Gas Industry Standard of the People's Republic of China Classification of locations for electrical installations at petroleum facilitiesSY/T 0025—95Editor: Shengli Petroleum Administration Bureau Survey and Design InstituteSichuan Junyou Administration Bureau Design InstituteChina Petroleum and Natural Gas Pipeline Bureau Design InstituteApproving Department: China National Petroleum CorporationPetroleum Industry Press1995BeijingBasic conditions for fire or explosionFlammable and combustible liquids, gases and vaporsFlammable and combustible liquidsFlammable high-volatility liquids t||Flammable gases lighter than air
Grouping of atmospheric mixtures
5Criteria for classification of places
[Class 1 zone
Class 1 zone 2
Unclassified places
Adjacent areas
Application of flammable gas detection equipment
Scope of classified places
Outdoor places
Enclosed areas
7Recommendations for determining the categories and scopes of classified places in petroleum refineries7.1
7. 2 Recommendations
8 Recommendations for determining the categories and scope of the classification sites of drilling and oil production facilities for fixed and mobile platforms on land and offshore (1)
Drilling areas
Oil production facilities
Oil and gas production wells
Oil and gas processing and storage equipment
Automatic closed monitoring and transfer equipment
Flammable gas cover production and treatment equipment
Compressors or pumps handling volatile flammable liquids, gases or vapors Prime movers using hydrocarbons as fuels
Discharge channels
Valves and valve operators…·
Recommendations for determining the degree and extent of classification of oil pipeline facilities
Application of diagrams*
Notes to example diagrams
Appendix A
Appendix B
Appendix C
Appendix D
Grouping and auto-ignition temperatures of flammable gases and liquid vapors Calculation of auto-ignition temperatures using formulas (5.6.2-1) and (5.6.2-2) for sealing by natural ventilation Example of good ventilation of enclosed areasCalculation of minimum air intake volume for good ventilation of volatile matter emission
Procedure for site classification
Step 1: Necessity of classification··
Step 2: Assignment of categories··
Step 3: Scope of classified sites·
Step 4: Determination of (mixed gas) groupsProvision of documents
Appendix E
Provisions for the starting point of the classification scope of explosion-hazardous sites 1
Additional notes
Classification of sites for electrical installations in petroleum facilities
Explanation of clauses
Document of China National Petroleum Corporation
(95) CNPC Technical Supervision No. 315
Notice on the approval and release of two petroleum and natural gas industry standards, including "Classification of Sites for Electrical Installations in Petroleum Facilities"To all relevant units:
The two petroleum and natural gas industry standards, including "Classification of Sites for Electrical Installations in Petroleum Facilities" (draft), have been reviewed and approved and are now approved as petroleum and natural gas industry standards for release. The numbers and names of the standards are as follows: No.
1. SY/T0025-95 Classification of locations for electrical installations in petroleum facilities (replacing SYJ 25-87)
2.SY/T4083--95
Technical specification for stress relief welding by electrothermal method
The above standards shall be implemented from November 15, 1995. China National Petroleum Corporation
May 25, 1995
1.0.1. Purpose: The purpose of this standard is to provide guidance for the classification of locations in petroleum facilities and for the selection and installation of electrical equipment.
For electrical installations in areas where flammable liquids or gases are produced, processed, or stored, appropriate design treatment can be carried out if potential sources of release or accumulation locations can be clearly identified. Once the location is classified, the required electrical equipment and its wiring can be determined from the applicable standards.
1.0.2 Scope: This standard applies to ground construction of oil and gas fields, new construction and expansion of pipelines. New construction and expansion of refineries and drilling projects can refer to the heat line. More generally, this standard applies to places where electrical equipment is temporarily or permanently installed. This standard does not apply to places where non-electrical equipment is installed. It does not apply to heating, air conditioning, cooking, laundry and similar pipeline systems using odorized natural gas as fuel: it does not apply to places involving possible major accidents and spraying or rupture of working containers, and emergency measures need to be taken in the event of such extreme conditions. Parts not covered by this standard should still comply with relevant national standards and specifications in force.
In order to determine the hazard level and scope of site classification, in Chapter 7, Chapter 8 and Chapter 9 of this standard, recommendations are given for specific examples often encountered in petroleum facilities. Although the regional classification of refining, drilling and pipeline facilities should be unified to some extent, considering that the above facilities are still different (at least partially different), this standard specifically describes their respective characteristics in the above three chapters. , some differences include the type and amount of product handled, the size of machinery in typical facilities and the form of enclosure (or shielding).
Chapter 7 is for places where flammable petroleum gases or flammable liquids are processed, stored, loaded and unloaded within refineries.
Chapter 8 is for fixed or mobile platforms on land and offshore (facilities where flammable petroleum gases and volatile liquids are produced, processed, stored, transported, drilling and servicing are carried out). In other words, it applies to places where treatment takes place before entering the transportation facilities. Chapter 9 applies to general pipeline facilities onshore and offshore for the transportation of flammable or flammable oils and gases. Pipeline facilities include pumping stations, compressor stations, storage facilities, manifolds, valve blocks and pipeline laying areas.
2.o.1 Flammable Fiammable
Easily ignited, capable of burning intensely or with rapid flame spread. 2..2 Flammable Liquid Fiammable Liquid (IA, IB, IC liquids) At a temperature of 38°C, the vapor pressure does not exceed 276 kPa absolute pressure and the flash point is lower than 38°C. Flammable liquids are divided into three categories: 1A, IB, and IC: See 4.2. The boundaries of flammable liquids are as follows:
1A liquid: liquids with a flash point lower than 22.8°C and a boiling point lower than 38°C. 1B liquid: liquids with a flash point lower than 22.8°C and a boiling point equal to or higher than 38°C. 1C liquid: liquids with a flash point equal to or higher than 22.8°C but lower than 38°C. 2.0.3H Combustible Liquid (H) Class A and B liquids with a flash point equal to or higher than 38°C. See 4.2. Combustible liquids can be divided as follows:
Class I liquid: liquids with a flash point equal to or higher than 38°C and lower than 60°C. : Class A liquid: liquids with a flash point equal to or higher than 60°C and lower than 93°C. Class IIIB liquid: liquids with a flash point equal to or higher than 93°C. 2.0.4 Volatile Flammable Liquid Volatile Flammable Liquid: flammable liquid with a temperature higher than its flash point, or a vapor pressure not exceeding 276 kPa at a temperature of 38°C. Absolute pressure, the temperature of which is higher than the flash point of the volatile liquid. 2.0.5 Highly Volatile Liquids (HVLs or HVLS)
Liquids with a vapor pressure exceeding 276 kPa absolute pressure at a temperature of 38°C. See 4.3.
2.0.6 Flammable Highly Volatile Liquid See Highly Volatile Liquid.
2..7 Ignitable (Flammable) Mixtures )Mixture3
Hazardous gas and air mixture, which can be ignited by bright ash, electric arc, spark: or can be detonated by components with working temperature greater than or equal to the ignition temperature of the mixture, see "Flammability (explosion) limits".
2.o.8 Emissions of volatile substances FugitiveEmissions Continuous release of flammable gases and vapors, but relatively small compared with the release after equipment damage, these releases occur during the operation of closed systems and are gas leaks from equipment accessories in the system such as pump seals, valve seals and flange gaskets. See Appendix. 2.0.9 Hazardous gases heavier than air Gases, Heavier-Than-Air See 6.2.2. bzxz.net
2.0.10 Hazardous gases lighter than air Gases, Lighter-Than-Ail See 4.4 and 6.2.2.
2.0.11 Flash Point
The lowest temperature at which a liquid can release enough vapor to form an explosive gas mixture that can flash under standard conditions. 2.D.12 Flammable (Explosive) Limits The lower and upper volume percentage limits of the concentration of dangerous gases that can mix with air to form a flammable mixture.
2.n.13 Vapor Pressure The absolute pressure of the gas phase when a substance is in a state of gas-tumble equilibrium at a certain temperature.
Z..I4 Ignition Temperature
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