Classificatoin of special environmental condition—Part 2:Dry heat-desert
Some standard content:
ICS19.040
National Standard of the People's Republic of China
GB/T19608.2—2004
Classification of special environmental condition
Part 2: Dry heat-desert
Classification of special environmental condition-Part 2: Dry heat-desertPromulgated on December 13, 2004
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of ChinaStandards Administration of the People's Republic of China
Implementation on June 1, 2005
GB/T1960B.2—2004
GB/T19608"Classification of special environmental conditions" is divided into several parts:Part 1: Dry heat
Part 2: Dry heat desert
—Part 3: Plateau
Other parts to be determined
This part is Part 2 of GB/T 19608. Appendix A of this part is an informative appendix.
This part was proposed by China Electrical Equipment Industry Association. This part is under the jurisdiction of Beijing Electrical and Electronic Technology Economic Research Institute of Machinery Industry. This part was drafted by Guangzhou Electric Science Research Institute, and Beijing Electrical and Electronic Technology Economic Research Institute participated in the drafting. The main drafters of this part are Chen Ling, Liu Kuishi, Gan Qing, Zhu Ling, and Guo Liping. Introduction
GB/T19608.2-2004
"Special Environmental Conditions Classification Part 2: Extremely hot deserts\It is one of the series of national standards developed by the "National Science and Technology Basic Work Special Project\Extreme (Special) Environmental Conditions Material Standards" project, which is mainly formulated for the urgent need of the development and construction of western my country. This part specifies the environmental parameters and severity levels of electrical products under the environmental conditions of extremely hot deserts. Various products can select the applicable items and levels according to the degree of environmental impact they are subjected to.
IEC Publication 60721-2-1 & Classification of Environmental Conditions: Naturally Hot Environmental conditions, temperature and humidity\The world is divided into 9 climate types, 6 of which exist in my country, and the natural environment is special. The hot desert occupies a large proportion in the northwest of my country. The climate is very dry in summer, the temperature is high, the temperature difference between day and night is large, the winter is cold, the wind and sand are strong and frequent, and its landform conditions are also very complex. The transportation conditions are relatively poor. The environmental conditions of the hot desert will have a great impact on the use of electromechanical products. Therefore, electromechanical products used in the hot desert environment must have good environmental adaptability and should be equipped with corresponding protective functions. These special natural environments have a great impact on materials under normal conditions, and the limit values of these special conditions are defined. , provide effective detection and testing methods, and give necessary technical measures for substances in special environmental conditions, which will have a significant impact on the normal use of substances in special environmental conditions. In the past, my country did not conduct much research on the performance of some materials and basic equipment in the above-mentioned special natural environment. There is still a gap in the basic research on special conditions, the adaptability of materials and equipment to special conditions, and the formulation of these basic standards, including the determination and classification of condition limits, simulation test methods, and technical measures to ensure the normal use of substances under extreme conditions. There is a lack of systematic collection and research on data for special conditions such as plateaus, dry heat and deserts. There is a lack of systematic research on the serious harm caused by special conditions to the basic research facilities of major engineering projects. If these problems are not solved, it will directly affect the implementation of major engineering projects under special conditions. The "Material Standards for Extreme (Special) Environmental Conditions" project mainly formulates basic national standards through research on special environmental conditions at high altitudes, major engineering basic materials, and electromechanical products. The content involves the standard system of plateau electromechanical equipment, special environmental conditions, classification of special environmental conditions, protection types, artificial simulation test at altitude, and plateau adaptability requirements for metal materials, high-resolution materials, major electromechanical equipment, and low-altitude mechanical equipment. A total of 26 national standards have been completed or are being studied in the project: (1) "Terms of Special Environmental Conditions" (has been submitted for approval) (2) "Special Environmental Conditions Classification Plateau" (has been published) (3) "Special Environmental Conditions Classification Hot Desert" (has been published) (4) Special Environmental Conditions Classification Dry Hot Desert (has been published) (5) "Special Environmental Conditions Protection Type and Code" (has been published) (6) Special Environmental Conditions Environmental Test Methods Part 1: General Principles (has been submitted for approval) (7) "Special Environmental Conditions: Environmental Test Methods Part 2: Artificial Simulation Test Methods and Guidelines for Electrical and Electronic Products (including Communication Equipment) (has been submitted for approval)
(8) "Special Environmental Conditions Environmental Test Methods Part 3: Human Simulation Test Methods and Guidelines for Polymer Materials" (has been submitted for approval
() Special Environmental Conditions Plateau Electrical and Electronic Products General Technical Conditions for Plateau Electric Products (already submitted for approval) (10) "Specifications for the Design, Selection and Inspection of Plateau Electric Equipment under Special Environmental Conditions" (already submitted for approval) (1) "Special Environmental Conditions Plateau Machinery Part 1: Requirements for Internal Combustion Powered Machinery under High Altitude Conditions (already submitted for approval) (2) "Special Environmental Conditions Plateau Machinery Part 2: Requirements for High Altitude Engineering Machinery\ (already submitted for approval) (13) & Special Environmental Conditions Plateau Machinery Part 3: Selection and Acceptance Specifications for Plateau Type Engineering Machinery has been submitted for approval) (14) Aluminum Alloy Profiles for Rail Vehicle Structures under Special Environmental Conditions" (already submitted for approval) (15) "Protection Requirements for Electrical and Electronic Products under Special Environmental Conditions - Lightning, Condensation and Pollution" has been submitted for approval) (16) "Technical Requirements for Electrical Equipment under Special Environmental Conditions Low Voltage Electrical Appliances\ (already submitted for approval) GB/T 19608.2—2004
(17) "Special Environmental Conditions
Plateau Technical Requirements for Electrical Equipment (Low Voltage Switchgear) (already submitted for approval) (18) "Special Environmental Conditions
Plateau Technical Requirements for Electrical Equipment (High Voltage Electrical Equipment and Switchgear)" is being formulated) Plateau Requirements for Internal Combustion Power Stations (under formulation) (19) "Special Environmental Conditions
(20) ≤ Special Environmental Conditions Copper Alloy Contact Wire for Electric Trains (under formulation) Selection Guidelines Part 1: Metal Surface Protection\ (already submitted for approval) (21) Special Environmental Conditions
(22) & Special Environmental Conditions Selection Guidelines Part 2: Polymer Materials (already submitted for approval) (23) "Special Environmental Conditions Plateau Natural Environment Test Guidelines - Internal Combustion Power "Machinery" (under preparation) "Guidelines for Plateau Natural Environment Tests - Construction Machinery" (under preparation) (24) & Special Environmental Conditions
(25) & Special Environmental Conditions
" Plateau Standardization System for Electromechanical Equipment"
1 Scope
Special Environmental Conditions Classification Part 2: Hot Dry Desert GB/T19608.2—2004
This part of GB/T19608 specifies the environmental parameters and severity levels of electromechanical products under hot dry desert environmental conditions. This part applies to electrical products used under hot dry desert environmental conditions. The environmental conditions specified in this part include the environmental parameters and severity levels to which the products are subjected and affected. Various types of products can select the applicable items and levels according to the degree of environmental impact they are subjected to. 2 Normative References
The provisions in the following documents become the provisions of this part through reference in this part of GB/T19608. For any dated reference, all subsequent amendments (excluding errata) or revisions are not applicable to this part, however, parties to agreements based on this part are encouraged to study whether the latest versions of these documents can be used. For any undated reference, the latest version applies to this part.
GB/T4798.2-1996 Environmental conditions for application of electric and electronic products (neqIEC60721-3-2.1995) GB/4798.10-1991 Introduction to environmental conditions for application of electric and electronic products (negIEC60721-3-0:1984) GR/T11804 Technical terms and definitions for environmental conditions of electric and electronic products 3 Terms and definitions
The terms and definitions established in G/T11804 apply to this part. 4 Environmental conditions
4.1 Classification of environmental conditions
The dry and hot desert environmental conditions are divided into 9 types: climatic conditions, special climatic conditions, biological conditions, chemically active substance conditions, mechanically active substance conditions, mechanical conditions, wind and sand conditions, groundwater conditions and transportation conditions: 4.2 Classification of environmental conditions
Each type of environmental conditions consists of multiple environmental parameters. For example, climatic conditions consist of environmental parameters such as high temperature, low temperature, temperature change, solar radiation intensity, etc. The various environmental parameters can be divided into several severity levels due to different environments. For example, the annual maximum temperature is divided into two levels: 45℃ and 50℃.
4.3 Environmental code
4.3.1 Environmental condition characteristics are indicated by environmental codes. Environmental codes consist of three parts: product use location, environmental condition type, and environmental condition severity level, which are indicated by numbers or Latin letters. The order is as follows: a) Transportation and use location (expressed in mathematics): h) Environmental condition type (expressed in Latin letters): c) Environmental condition severity level (expressed in numbers or numbers and Latin letters). 4.3.2 According to the provisions of 3.2 in GB/T4798.10-1.991, product transportation and use locations are indicated by the following numbers: 2 indicates product transportation conditions:
3 indicates product fixed use in a weather-proof location (indoor or outdoor): 4 indicates product fixed use in a weather-unprotected location (outdoor). GB/T 19608.2—2004
4.3.3 According to the provisions of 3.2 of GB/T4798.10—1991, the types of environmental conditions are expressed by Latin letters: K represents climatic conditions, B represents special climatic conditions (thermal radiation, ambient air movement, water sources other than water), B represents biological conditions; C represents chemically active substance conditions; S represents mechanically active substance conditions; M represents mechanical operation.
4.3.4 According to the provisions of 3.2 of GB/T 4798.10—1991, the severity of environmental conditions is expressed by numbers, and the larger the number, the more severe the conditions.
4.3.5 Examples of environmental codes for climatic conditions 3
Severity of environmental conditions
Climatic conditions
Climate protection sites
4.3.6 Examples of environmental codes for various types of environmental conditions: 3K6H/322/324/327/3B2/3C3/3S3/3M2 Mechanical conditions
Conditions of mechanically active substances
Conditions of chemically active substances
-Biological conditions
Special climatic conditions (dripping water)
Special climatic conditions (surrounding air movement) Special climatic conditions (heat radiation)
Climatic conditions
4.4 Various types of environmental conditions Severity level of climate conditions
4.4.1 Climate conditions
The severity level of climate conditions is shown in Table 1:
Environmental parameters
Extreme maximum
Annual average
Most severe monthly average canopy height
Maximum daily filter difference
Temperature change rate
Low relative humidity
Severity level of climate conditions
Severity level
Environmental parameters
Average relative humidity
Solar radiation intensity
Precipitation (including rain, snow, etc.)
Highest surface temperature
Low surface temperature
Table (thread)
GB/T 19608.2-2004
Note: 3K61) indicates indoor conditions in desert areas + 4K41)F indicates outdoor conditions in desert edge areas: 4K4DH indicates outdoor conditions in desert waist areas, the extreme maximum temperature layer refers to the highest air temperature that occurs once every few years and lasts for about 10 minutes, the annual maximum temperature base refers to the multi-year average of the highest temperature that occurs each year, and the hottest average maximum temperature refers to the half-value of the highest temperature that occurs every day in the hottest month. 4.4.2 Special climatic conditions
The severity of special climatic conditions is shown in Table 2. Table 2 Severity of special climatic conditions
Environmental parameters
Heat radiation
Ambient air vibration/
Others except rain
Water source conditions
4.4. 3 Biological conditions
Can be ignored
Climate-protected places
There are heat radiation conditions, such as indoor heating
systems or near boilers
Can be ignored
Can be ignored
Climate-free places
There are heat radiation conditions, such as thermal radiation caused by production conditions
The climate in hot desert areas is very harsh, and there is no harm from fungi and fungi. The main harm is from rats and other rodents. Biological conditions The severity levels of the conditions are shown in Table 3.
Table 3 Severity levels of biological conditions
Environmental parameters
Fauna
Climate-protected places
Climate-unprotected places
Rodents and other animals that are harmful to products Termites Rodents and other animals that are harmful to products, excluding termites
4.4.4 Chemically active substance conditions
Chemically active substances mainly refer to corrosive gases. The severity levels of chemically active substance conditions are shown in Table 4.
GB/T 19608.2—2004
Environmental parameters
Sulfur dioxide
Hydrogen sulfide
Table 4 Severity levels of chemically active substances
3C3, 4C3
Almost average
Maximum value?
Average value
If the concentration of one or more chemical gases in the atmosphere meets the values in this table, it belongs to this level. The average value is the average value of the long-term values over at least one year. 5
The maximum value is the plate limit value or peak value that does not exceed 30 minutes per day for at least one year. 4.4.5 Mechanically active material conditions
For the severity of mechanically active material conditions, see Table 5. Severity of mechanically active material conditions. Weather-protected locations
Environmental parameters
Dust (floating)
rng/tms
Dust (settling) g/(m·h)
4.4.6 Mechanical conditions
3CA,AC4
Maximum value
For locations without weather protection
This standard uses the severity of acceleration and position to classify sinusoidal vibration conditions in the high-frequency and low-frequency ranges respectively. Random vibration is not considered. If there is research data, it can also be considered. The maximum impact stress spectrum without damping is used to classify non-steady-state vibrations including impact. For the severity of mechanical conditions, see Table 6. The typical impulse response spectrum is shown in Figure 1. 1.8
Example of half-sine pulse duration
Spectrum type 1: duration 22 ms
Frequency elimination type 1: duration 1 m5
Ray spectrum type I: duration 6ms
Figure 1 Typical impact response spectrum (maximum response spectrum of the first level impact) 2000
Frequency/Hz
Sine steady-state vibration
Non-steady-state withdrawal
(including shock market)
Environmental parameters
Acceleration
Frequency range
Strike response
Spectrum 1. Peak value
Pa velocity
Strike response
Spectrum peak value
Acceleration
Reverse impact response
Huajiangfeng Town
Speed a
Net sand landform
4. 4. 7. 1
9--209
Table 6 Severity level of mechanical environmental conditions
9~-200
9~-20C
See Table 7 for the severity level of dry and hot desert landform conditions. 3M4
9~-200
5~-200
Severity level of landform conditions
Environmental parameters
Average dune height/m
Dune density P
1.2--0. 4
0. 41--, f1 0. 61 --0. 8
Note: The dune density is calculated using the following formula: B.:WW, +W.). Formula, W, average distance between ground. The larger the B is, the greater the density of the sand dunes is. 4. 4. 7. 2
For the distribution of sand dune density in hot deserts, see Figure 8. D5
0, 2-- 0. 1
GB/T 19608.2—2004
0. 41-~0. 6
9~-200
0.61-v0. 8
The average width of the sand body in this area; W, the distribution of sulfur density of sand dunes in this area
The distribution of sparse density of sand dunes
0.21~-0. 40
0. 41--0. 60
0. 61 ~-0. 80
The percentage of the whole desert area/is
Cumulative percentage/%
Note: The density of sand dunes in the eastern and central parts of the Taklimakan Desert is relatively small, ranging from (0. 21 to. 4(:). The central and western parts are between. 41-~1.6C. The most populous areas are in the northwest and the lower reaches of the Keli River and the Hotan River, 4.4.7.3
The mathematical mean values of various particle sizes of aeolian sand are shown in Table 9. Table 9 Distribution of particle sizes of aeolian sand
Mathematical mean value of particle size/mm
Particle content/%
0.18: t,17
.1 i 0, [Center
0.072. (8
Note: From the mathematical mean value of the particle size of aeolian sand, it can be seen that the average value of the particle size is between 0.05 mm and -0.1 mm, and the average value is concentrated between 0.08 mm and 0.1 mm. It can be seen that the aeolian sand is all fine sand, and the difference in coarseness and fineness is not large. GB/T19608.2—2004
4.4. 7.4
Changes in dust concentration in the desert with increasing altitude Table 10 Table 10 Changes in dust concentration in sand algae with increasing altitude Visibility conditions
Clear visibility 130 km
Sandstorm, visibility 300 m, air speed 10 m/s-~15 m/s
4.4.8 Groundwater mineralization
The severity level of groundwater mineralization is shown in Table 11. Table 11
Environmental parameters
Groundwater mineralization,
Maximum value
Altitude/
Severity level of groundwater mineralization
Average value
Note: Groundwater mineralization exceeds 50 g/1 4.4.9 Transportation conditions
Maximum value
Dust concentration/
Average value
Maximum value
The impact of desert transportation on products is mainly mechanical environmental conditions, according to the 2M4 level specified in Table 5 of GB/T4798.2-1996. A.1 Overview
Appendix A
(Informative Appendix)
Guidelines for the application of special environmental conditions
GB/T 19608.2--2004
A.1.1 The environmental parameters and severity levels of climatic conditions, special climatic conditions, biological conditions, chemically active substance conditions, mechanically active substance conditions and mechanical conditions specified in this part are based on the corresponding provisions of GB4798.3-1990 and GB4798.4-1990, combined with the provisions of dry hot desert environmental conditions:
A, 1.2 The codes of environmental condition levels are arranged in descending order according to the severity of the environmental parameters. Large numbers indicate high severity, and high severity levels include low severity levels. A.1.3 Added to the dry hot desert environmental conditions Classification. The main impacts of hot desert environmental conditions on electromechanical products are sand and dust, high temperature (air temperature and surface temperature), strong solar radiation (for products used outdoors) and large temperature differences. All types of products should select appropriate parameters according to the characteristics of their products and the impact of the use environment on them. For example, the maximum temperature of the environmental conditions for thermal protection relays and certain electronic products that are sensitive to high temperatures should be selected as the extreme maximum value: the maximum temperature of products that will be affected by overflow can be selected as the multi-year average of the maximum temperature: internal combustion engines and other products that require air input for combustion must consider the impact of sand: products used in outdoor environments must consider the impact of strong solar radiation, and the impact of wind and sand landforms on transportation machinery is the most obvious.
A.1, 4 Special climatic conditions, biological conditions, chemically active substance conditions, mechanically active substance conditions and mechanical environmental conditions are all determined based on the local environmental conditions around the product when it is used to determine whether they need to be considered in product design and selection, so as to select the appropriate product protection type.
A,2 Applicable places
A.2.1 Climate conditions
See Table A,1 for climate conditions and applicable places. Table A.1 Climate conditions and applicable places
Climate condition environment code
A.2.2 Special climate conditions
Applicable places
Places with condensation protection such as electrical screwing rooms, generator rooms, sand-proof pavilions and indoor living facilities without adjustment in desert areas
Drilling platforms at the edge of sand molds, window air conditioners, some cable laying places, oil tanks and other places without climate protection Drilling platforms, window air conditioners, some cable laying places, oil tanks and other places without climate protection in the hinterland of the desert Special climate conditions refer to the additional heat, wind speed and various water sources caused by production conditions or other reasons. These environmental parameters are not caused by simple climate conditions: special climate conditions include heat radiation, surrounding air movement and water sources other than rain. The application site is selected according to Table 2.
A.2.3 Biological conditions
Applicable sites for biological conditions:
3B1 level is applicable to climate-protected sites without biological hazards: -32 level is applicable to climate-protected sites with rodents and other animals that endanger products (except household ants): -4B1 level is applicable to climate-free sites with rodents and other animals that endanger products (except H ants). GB/T 19608.2—2004
A.2.4 Chemically active substances conditions
Chemically active substances refer to corrosive gases discharged from mud control systems and heating systems. Under certain humidity conditions (such as the surrounding, internal splashing and spraying conditions of the solid control system), the relative condensation degree may reach more than 70%. These gases will quickly corrode the metal, destroy the appearance of the product and hinder the normal operation of the equipment. Suitable places for chemical active substances:
33, 34 grades are suitable for places with climate protection where heavy chemical corrosive substances are produced, such as generator rooms, drilling platforms, etc.: 43, 4C4 grades are suitable for places without climate protection where there are serious chemical corrosion media, such as openings, mud solid control systems, etc.
A.2.5 Mechanically active substances conditions
Mechanically active substances conditions Applicable places:
3S3.3S4 grades are suitable for places with climate protection in dry hot sand film areas, .…~4S3.4S4 grades are suitable for places without climate protection in hot sand areas.A 2.6 Mechanical environmental conditions Mechanical environmental conditions Applicable places A.2 Table A2 Mechanical environmental conditions Applicable places Mechanical environmental conditions Code 3M1, 3M2. 4M1, 4M2 3M3. 3M4. 4M3. 4M4 3M5, 3M6, 4M5. 1M6 3M7, 3M8 4M7, 4M8 A.2.7 Sandy landforms Applicable places Places with low probability of perturbation and impact or places with anti-vibration and anti-impact measures Areas where vibration is caused by machinery or vehicles Places where the impact is caused by blasting, piling, etc. Places where the machine or vehicle causes vibration or nearby machines, conveyor belts, etc. The product is directly installed on the machine, and the machine itself causes large energy vibration and impact. The dry hot desert (Taklimakan Desert) covers an area of 337,000 square kilometers, and mobile sand dunes account for 85% of the entire area. Two environmental parameters are engraved in the severity level of wind and sand landforms, namely the average sand dune height and sand dune density. The city selects the applicable places of severity levels D1 to D7 according to the actual situation. In addition, the distribution of sand dune density, the mathematical average content of various particle sizes of aeolian sand, and the change of desert sand concentration with increasing severity are given (see GB/T 4797.6-1995), for users' reference. A.2.8 Groundwater
Groundwater is abundant in the hot and dry sandy areas, with a general depth of 2In~-5. The water contains a large amount of mineralized substances, and the mineralization degree is generally 3g1~11 g/1, and it is higher in some areas.
The fluoride content in groundwater is relatively high, ranging from 1 mg/1 to ~5 mg/1, and the highest is 17.11 mg/1. In some groundwater, the magnesium content exceeds the living standard, and the nitrate content is more than 10 mg/1. The severity of the groundwater mineralization is stipulated as W1, W2, and W3. The applicable places are selected according to Table 10, A, 2. 9 Transportation
Products entering the desert must be subjected to harsh transportation conditions. According to the provisions of 13/104798.2-1996 standard, the main impact on products during desert transportation is mechanical conditions, namely vibration, drop, swing, etc. Other conditions such as climate, biological, and chemical active substances have relatively small impacts, and have been specified in the use environment conditions. This is not considered in the transportation conditions. The road conditions in the dry and hot sand area are very bad, and only 2M4 severity level is specified in the transportation conditions. A.3 Application example
The general environment representative of Le equipment expressed the special environmental conditions of outdoor use of the oil refinery in Huierle on the edge of the Karamak Desert in Xinjiang:(8
Note: From the mathematical mean of the particle size of aeolian sand, it can be seen that the average value of the particle size is between 0.05 mm and -0.1 mm, and 50% of them are concentrated between 0.08 nm and 0.1 mm. It can be seen that the aeolian sand is all fine sand, and the difference in coarseness and fineness is not large. GB/T19608.2—2004
4.4.7.4
Changes in dust concentration in the desert with increasing altitude Table 10 Table 10 Changes in dust concentration in sand algae with increasing altitude Visibility conditions
Clear visibility 130 km/l
Sandstorm, visibility 300 m, air speed 10 m/s-~15 m/s
4.4.8 Groundwater mineralization
The severity level of groundwater mineralization is shown in Table 11. Table 11
Environmental parameters
Minimum value
Height/
Severity level of groundwater mineralization
Average value
Note: When the groundwater mineralization exceeds 50 g/1, it shall be determined according to the measured data. 4.4.9 Transportation conditions
Maximum value
Dust concentration/
Average value
Maximum value
The impact on the product during desert transportation is mainly mechanical environmental conditions, according to the 2M4 level specified in Table 5 of GB/T4798.2-1996. A.1 Overview
Appendix A
(Informative Appendix)
Guidelines for the application of special environmental conditions
GB/T 19608.2--2004
A.1.1 The environmental parameters and severity levels of climatic conditions, special climatic conditions, biological conditions, chemically active substance conditions, mechanically active substance conditions and mechanical conditions specified in this part are based on the corresponding clauses of GB4798.3-1990 and GB4798.4-1990, combined with the provisions of dry hot desert environmental conditions:
A, 1.2 The codes of environmental condition levels are arranged in order from low to high according to the severity of the environmental parameters. Large numbers indicate high severity, and high severity levels include low severity levels. A.1.3 Add some parts to classify dry hot desert environmental conditions. The main impacts of dry hot desert environmental conditions on electromechanical products are sand and dust, high temperature (air temperature and surface temperature), and strong solar radiation (for products for outdoor use) The temperature difference between the indoor and outdoor temperature is large. The appropriate parameters should be selected for each product according to its characteristics and the impact of the use environment. For example, the maximum temperature of the environmental conditions of thermal protection relays and some electronic products that are sensitive to high temperatures should be selected as the extreme maximum value: the maximum temperature of products that will be affected by overflow can be selected as the multi-year average of the maximum temperature: internal combustion engines and other products that require air input for combustion must consider the impact of sand: products used in outdoor environments must consider the impact of strong solar radiation, and the impact of wind and sand landforms on transportation machinery is the most obvious.
A.1, 4 Special climatic conditions, biological conditions, chemical active substance conditions, mechanical active substance conditions and mechanical environmental conditions are all determined based on the local environmental conditions around the product when it is used to determine whether they need to be considered in product design and selection, so as to select the appropriate product protection type.
A,2 Applicable places
A.2.1 Climate conditions
See Table A,1 for climate conditions and applicable places. Table A.1 Climate conditions and applicable places
Climate condition environment code
A.2.2 Special climate conditions
Applicable places
Places with condensation protection such as electrical screwing rooms, generator rooms, sand-proof pavilions and indoor living facilities without adjustment in desert areas
Drilling platforms at the edge of sand molds, window air conditioners, some cable laying places, oil tanks and other places without climate protection Drilling platforms, window air conditioners, some cable laying places, oil tanks and other places without climate protection in the hinterland of the desert Special climate conditions refer to the additional heat, wind speed and various water sources caused by production conditions or other reasons. These environmental parameters are not caused by simple climate conditions: special climate conditions include heat radiation, surrounding air movement and water sources other than rain. The application site is selected according to Table 2.
A.2.3 Biological conditions
Applicable sites for biological conditions:
3B1 level is applicable to climate-protected sites without biological hazards: -32 level is applicable to climate-protected sites with rodents and other animals that endanger products (except household ants): -4B1 level is applicable to climate-free sites with rodents and other animals that endanger products (except H ants). GB/T 19608.2—2004
A.2.4 Chemically active substances conditions
Chemically active substances refer to corrosive gases discharged from mud control systems and heating systems. Under certain humidity conditions (such as the surrounding, internal splashing and spraying conditions of the solid control system), the relative condensation degree may reach more than 70%. These gases will quickly corrode the metal, destroy the appearance of the product and hinder the normal operation of the equipment. Suitable places for chemical active substances:
33, 34 grades are suitable for places with climate protection where heavy chemical corrosive substances are produced, such as generator rooms, drilling platforms, etc.: 43, 4C4 grades are suitable for places without climate protection where there are serious chemical corrosion media, such as openings, mud solid control systems, etc.
A.2.5 Mechanically active substances conditions
Mechanically active substances conditions Applicable places:
3S3.3S4 grades are suitable for places with climate protection in dry hot sand film areas, .…~4S3.4S4 grades are suitable for places without climate protection in hot sand areas.A 2.6 Mechanical environmental conditions Mechanical environmental conditions Applicable places A.2 Table A2 Mechanical environmental conditions Applicable places Mechanical environmental conditions Code 3M1, 3M2. 4M1, 4M2 3M3. 3M4. 4M3. 4M4 3M5, 3M6, 4M5. 1M6 3M7, 3M8 4M7, 4M8 A.2.7 Sandy landforms Applicable places Places with low probability of perturbation and impact or places with anti-vibration and anti-impact measures Areas where vibration is caused by machinery or vehicles Places where the impact is caused by blasting, piling, etc. Places where the machine or vehicle causes vibration or nearby machines, conveyor belts, etc. The product is directly installed on the machine, and the machine itself causes large energy vibration and impact. The dry hot desert (Taklimakan Desert) covers an area of 337,000 square kilometers, and mobile sand dunes account for 85% of the entire area. Two environmental parameters are engraved in the severity level of wind and sand landforms, namely the average sand dune height and sand dune density. The city selects the applicable places of severity levels D1 to D7 according to the actual situation. In addition, the distribution of sand dune density, the mathematical average content of various particle sizes of aeolian sand, and the change of desert sand concentration with increasing severity are given (see GB/T 4797.6-1995), for users' reference. A.2.8 Groundwater
Groundwater is abundant in the hot and dry sandy areas, with a general depth of 2In~-5. The water contains a large amount of mineralized substances, and the mineralization degree is generally 3g1~11 g/1, and it is higher in some areas.
The fluoride content in groundwater is relatively high, ranging from 1 mg/1 to ~5 mg/1, and the highest is 17.11 mg/1. In some groundwater, the magnesium content exceeds the living standard, and the nitrate content is more than 10 mg/1. The severity of the groundwater mineralization is stipulated as W1, W2, and W3. The applicable places are selected according to Table 10, A, 2. 9 Transportation
Products entering the desert must be subjected to harsh transportation conditions. According to the provisions of 13/104798.2-1996 standard, the main impact on products during desert transportation is mechanical conditions, namely vibration, drop, swing, etc. Other conditions such as climate, biological, and chemical active substances have relatively small impacts, and have been specified in the use environment conditions. This is not considered in the transportation conditions. The road conditions in the dry and hot sand area are very bad, and only 2M4 severity level is specified in the transportation conditions. A.3 Application example
The general environment representative of Le equipment expressed the special environmental conditions of outdoor use of the oil refinery in Huierle on the edge of the Karamak Desert in Xinjiang:(8
Note: From the mathematical mean of the particle size of aeolian sand, it can be seen that the average value of the particle size is between 0.05 mm and -0.1 mm, and 50% of them are concentrated between 0.08 nm and 0.1 mm. It can be seen that the aeolian sand is all fine sand, and the difference in coarseness and fineness is not large. GB/T19608.2—2004
4.4.7.4
Changes in dust concentration in the desert with increasing altitude Table 10 Table 10 Changes in dust concentration in sand algae with increasing altitude Visibility conditions
Clear visibility 130 km/l
Sandstorm, visibility 300 m, air speed 10 m/s-~15 m/s
4.4.8 Groundwater mineralization
The severity level of groundwater mineralization is shown in Table 11. Table 11
Environmental parameters
Minimum value
Height/
Severity level of groundwater mineralization
Average value
Note: When the groundwater mineralization exceeds 50 g/1, it shall be determined according to the measured data. 4.4.9 Transportation conditions
Maximum value
Dust concentration/
Average value
Maximum value
The impact on the product during desert transportation is mainly mechanical environmental conditions, according to the 2M4 level specified in Table 5 of GB/T4798.2-1996. A.1 Overview
Appendix A
(Informative Appendix)
Guidelines for the application of special environmental conditions
GB/T 19608.2--2004
A.1.1 The environmental parameters and severity levels of climatic conditions, special climatic conditions, biological conditions, chemically active substance conditions, mechanically active substance conditions and mechanical conditions specified in this part are based on the corresponding clauses of GB4798.3-1990 and GB4798.4-1990, combined with the provisions of dry hot desert environmental conditions:
A, 1.2 The codes of environmental condition levels are arranged in order from low to high according to the severity of the environmental parameters. Large numbers indicate high severity, and high severity levels include low severity levels. A.1.3 Add some parts to classify dry hot desert environmental conditions. The main impacts of dry hot desert environmental conditions on electromechanical products are sand and dust, high temperature (air temperature and surface temperature), and strong solar radiation (for products for outdoor use) The temperature difference between the indoor and outdoor temperature is large. The appropriate parameters should be selected for each product according to its characteristics and the impact of the use environment. For example, the maximum temperature of the environmental conditions of thermal protection relays and some electronic products that are sensitive to high temperatures should be selected as the extreme maximum value: the maximum temperature of products that will be affected by overflow can be selected as the multi-year average of the maximum temperature: internal combustion engines and other products that require air input for combustion must consider the impact of sand: products used in outdoor environments must consider the impact of strong solar radiation, and the impact of wind and sand landforms on transportation machinery is the most obvious.
A.1, 4 Special climatic conditions, biological conditions, chemical active substance conditions, mechanical active substance conditions and mechanical environmental conditions are all determined based on the local environmental conditions around the product when it is used to determine whether they need to be considered in product design and selection, so as to select the appropriate product protection type.
A,2 Applicable places
A.2.1 Climate conditions
See Table A,1 for climate conditions and applicable places. Table A.1 Climate conditions and applicable places
Climate condition environment code
A.2.2 Special climate conditions
Applicable places
Places with condensation protection such as electrical screwing rooms, generator rooms, sand-proof pavilions and indoor living facilities without adjustment in desert areas
Drilling platforms at the edge of sand molds, window air conditioners, some cable laying places, oil tanks and other places without climate protection Drilling platforms, window air conditioners, some cable laying places, oil tanks and other places without climate protection in the hinterland of the desert Special climate conditions refer to the additional heat, wind speed and various water sources caused by production conditions or other reasons. These environmental parameters are not caused by simple climate conditions: special climate conditions include heat radiation, surrounding air movement and water sources other than rain. The application site is selected according to Table 2.
A.2.3 Biological conditions
Applicable sites for biological conditions:
3B1 level is applicable to climate-protected sites without biological hazards: -32 level is applicable to climate-protected sites with rodents and other animals that endanger products (except household ants): -4B1 level is applicable to climate-free sites with rodents and other animals that endanger products (except H ants). GB/T 19608.2—2004
A.2.4 Chemically active substances conditions
Chemically active substances refer to corrosive gases discharged from mud control systems and heating systems. Under certain humidity conditions (such as the surrounding, internal splashing and spraying conditions of the solid control system), the relative condensation degree may reach more than 70%. These gases will quickly corrode the metal, destroy the appearance of the product and hinder the normal operation of the equipment. Suitable places for chemical active substances:
33, 34 grades are suitable for places with climate protection where heavy chemical corrosive substances are produced, such as generator rooms, drilling platforms, etc.: 43, 4C4 grades are suitable for places without climate protection where there are serious chemical corrosion media, such as openings, mud solid control systems, etc.
A.2.5 Mechanically active substances conditions
Mechanically active substances conditions Applicable places:
3S3.3S4 grades are suitable for places with climate protection in dry hot sand film areas, .…~4S3.4S4 grades are suitable for places without climate protection in hot sand areas.A 2.6 Mechanical environmental conditions Mechanical environmental conditions Applicable places A.2 Table A2 Mechanical environmental conditions Applicable places Mechanical environmental conditions Code 3M1, 3M2. 4M1, 4M2 3M3. 3M4. 4M3. 4M4 3M5, 3M6, 4M5. 1M6 3M7, 3M8 4M7, 4M8 A.2.7 Sandy landforms Applicable places Places with low probability of perturbation and impact or places with anti-vibration and anti-impact measures Areas where vibration is caused by machinery or vehicles Places where the impact is caused by blasting, piling, etc. Places where the machine or vehicle causes vibration or nearby machines, conveyor belts, etc. The product is directly installed on the machine, and the machine itself causes large energy vibration and impact. The dry hot desert (Taklimakan Desert) covers an area of 337,000 square kilometers, and mobile sand dunes account for 85% of the entire area. Two environmental parameters are engraved in the severity level of wind and sand landforms, namely the average sand dune height and sand dune density. The city selects the applicable places of severity levels D1 to D7 according to the actual situation. In addition, the distribution of sand dune density, the mathematical average content of various particle sizes of aeolian sand, and the change of desert sand concentration with increasing severity are given (see GB/T 4797.6-1995), for users' reference. A.2.8 Groundwater
Groundwater is abundant in the hot and dry sandy areas, with a general depth of 2In~-5. The water contains a large amount of mineralized substances, and the mineralization degree is generally 3g1~11 g/1, and it is higher in some areas.
The fluoride content in groundwater is relatively high, ranging from 1 mg/1 to ~5 mg/1, and the highest is 17.11 mg/1. In some groundwater, the magnesium content exceeds the living standard, and the nitrate content is more than 10 mg/1. The severity of the groundwater mineralization is stipulated as W1, W2, and W3. The applicable places are selected according to Table 10, A, 2. 9 Transportation
Products entering the desert must be subjected to harsh transportation conditions. According to the provisions of 13/104798.2-1996 standard, the main impact on products during desert transportation is mechanical conditions, namely vibration, drop, swing, etc. Other conditions such as climate, biological, and chemical active substances have relatively small impacts, and have been specified in the use environment conditions. This is not considered in the transportation conditions. The road conditions in the dry and hot sand area are very bad, and only 2M4 severity level is specified in the transportation conditions. A.3 Application example
The general environment representative of Le equipment expressed the special environmental conditions of outdoor use of the oil refinery in Huierle on the edge of the Karamak Desert in Xinjiang:Visibility 300 m, air speed 10 m/s-~15 m/s
4.4.8 Groundwater mineralization
The severity level of groundwater mineralization is shown in Table 11. Table 11
Environmental parameters
Groundwater mineralization,
Maximum value
Height/
Severity level of groundwater mineralization
Average value
Note: When the groundwater mineralization exceeds 50 g/1, it shall be determined according to the measured data. 4.4.9 Transportation conditions
Maximum value
Dust concentration/
Average value
Maximum value
The impact on the product in desert transportation is mainly mechanical environmental conditions, according to the 2M4 level specified in Table 5 of GB/T4798.2-1996. A.1 Overview
Appendix A
(Informative Appendix)
Guidelines for the application of special environmental conditions
GB/T 19608.2--2004
A.1.1 The environmental parameters and severity levels of climatic conditions, special climatic conditions, biological conditions, chemically active substance conditions, mechanically active substance conditions and mechanical conditions specified in this part are based on the corresponding provisions of GB4798.3-1990 and GB4798.4-1990, combined with the provisions of dry hot desert environmental conditions:
A, 1.2 The codes of environmental condition levels are arranged in descending order according to the severity of the environmental parameters. Large numbers indicate high severity, and high severity levels include low severity levels. A.1.3 Add some sections to classify dry hot desert environmental conditions. The main impacts of hot desert environmental conditions on electromechanical products are sand and dust, high temperature (air temperature and surface temperature), strong solar radiation (for products used outdoors) and large temperature differences. All types of products should select appropriate parameters according to their product characteristics and the impact of the use environment. For example, the maximum temperature of the environmental conditions of thermal protection relays and certain electronic products that are sensitive to high temperatures should be selected as the extreme maximum value: the maximum temperature of products that will be affected by overflow can be selected as the multi-year average of the maximum temperature: internal combustion engines and other products that require air input for combustion must consider the impact of sand: products used in outdoor environments must consider the impact of strong solar radiation, and the impact of wind and sand landforms on transportation machinery is the most obvious.
A.1, 4 Special climatic conditions, biological conditions, chemically active substance conditions, mechanically active substance conditions and mechanical environmental conditions are all determined based on the local environmental conditions around the product when it is used to determine whether they need to be considered in product design and selection, so as to select the appropriate product protection type.
A,2 Applicable places
A.2.1 Climate conditions
See Table A,1 for climate conditions and applicable places. Table A.1 Climate conditions and applicable places
Climate condition environment code
A.2.2 Special climate conditions
Applicable places
Places with condensation protection such as electrical screwing rooms, generator rooms, sand-proof pavilions and indoor living facilities without adjustment in desert areas
Drilling platforms at the edge of sand molds, window air conditioners, some cable laying places, oil tanks and other places without climate protection Drilling platforms, window air conditioners, some cable laying places, oil tanks and other places without climate protection in the hinterland of the desert Special climate conditions refer to the additional heat, wind speed and various water sources caused by production conditions or other reasons. These environmental parameters are not caused by simple climate conditions: special climate conditions include heat radiation, surrounding air movement and water sources other than rain. The application site is selected according to Table 2.
A.2.3 Biological conditions
Applicable sites for biological conditions:
3B1 level is applicable to climate-protected sites without biological hazards: -32 level is applicable to climate-protected sites with rodents and other animals that endanger products (except household ants): -4B1 level is applicable to climate-free sites with rodents and other animals that endanger products (except H ants). GB/T 19608.2—2004
A.2.4 Chemically active substances conditions
Chemically active substances refer to corrosive gases discharged from mud control systems and heating systems. Under certain humidity conditions (such as the surrounding, internal splashing and spraying conditions of the solid control system), the relative condensation degree may reach more than 70%. These gases will quickly corrode the metal, destroy the appearance of the product and hinder the normal operation of the equipment. Suitable places for chemical active substances:
33, 34 grades are suitable for places with climate protection where heavy chemical corrosive substances are produced, such as generator rooms, drilling platforms, etc.: 43, 4C4 grades are suitable for places without climate protection where there are serious chemical corrosion media, such as openings, mud solid control systems, etc.
A.2.5 Mechanically active substances conditions
Mechanically active substances conditions Applicable places:
3S3.3S4 grades are suitable for places with climate protection in dry hot sand film areas, .…~4S3.4S4 grades are suitable for places without climate protection in hot sand areas.A 2.6 Mechanical environmental conditions Mechanical environmental conditions Applicable places A.2 Table A2 Mechanical environmental conditions Applicable places Mechanical environmental conditions Code 3M1, 3M2. 4M1, 4M2 3M3. 3M4. 4M3. 4M4 3M5, 3M6, 4M5. 1M6 3M7, 3M8 4M7, 4M8 A.2.7 Sandy landforms Applicable places Places with low probability of perturbation and impact or places with anti-vibration and anti-impact measures Areas where vibration is caused by machinery or vehicles Or the place where the impact is caused by blasting, piling, etc. The place where the machine or the vehicle causes vibration or nearby machines, conveyor belts, etc. The product is directly installed on the machine, and the machine itself causes large energy vibration and impact. The dry hot desert (Taklimakan Desert) covers an area of 337,000 square kilometers, and the mobile sand dunes account for 85% of the entire area. Two environmental parameters are engraved in the severity level of the wind and sand landform, namely the average sand dune height and sand dune density. The city selects the applicable places of severity levels D1 to D7 according to the actual situation. In addition, the distribution of sand dune density, the mathematical average content of various particle sizes of aeolian sand, and the change of desert sand concentration with increasing severity are given (see GB/T 4797.6-1995), for users' reference. A.2.8 Groundwater
Groundwater is abundant in the hot and dry sandy areas, with a general depth of 2In~-5. The water contains a large amount of mineralized substances, and the mineralization degree is generally 3g1~11 g/1, and it is higher in some areas.
The fluoride content in groundwater is relatively high, ranging from 1 mg/1 to ~5 mg/1, and the highest is 17.11 mg/1. In some groundwater, the magnesium content exceeds the living standard, and the nitrate content is more than 10 mg/1. The severity of the groundwater mineralization is stipulated as W1, W2, and W3. The applicable places are selected according to Table 10, A, 2. 9 Transportation
Products entering the desert must be subjected to harsh transportation conditions. According to the provisions of 13/104798.2-1996 standard, the main impact on products during desert transportation is mechanical conditions, namely vibration, drop, swing, etc. Other conditions such as climate, biological, and chemical active substances have relatively small impacts, and have been specified in the use environment conditions. This is not considered in the transportation conditions. The road conditions in the dry and hot sand area are very bad, and only 2M4 severity level is specified in the transportation conditions. A.3 Application example
The general environment representative of Le equipment expressed the special environmental conditions of outdoor use of the oil refinery in Huierle on the edge of the Karamak Desert in Xinjiang:Visibility 300 m, air speed 10 m/s-~15 m/s
4.4.8 Groundwater mineralization
The severity level of groundwater mineralization is shown in Table 11. Table 11
Environmental parameters
Groundwater mineralization,
Maximum value
Height/
Severity level of groundwater mineralization
Average value
Note: When the groundwater mineralization exceeds 50 g/1, it shall be determined according to the measured data. 4.4.9 Transportation conditions
Maximum value
Sand and dust concentration/
Average value
Maximum value
The impact on the product in desert transportation is mainly mechanical environmental conditions, according to the 2M4 level specified in Table 5 of GB/T4798.2-1996. A.1 Overview
Appendix A
(Informative Appendix)bzxZ.net
Guidelines for the application of special environmental conditions
GB/T 19608.2--2004
A.1.1 The environmental parameters and severity levels of climatic conditions, special climatic conditions, biological conditions, chemically active substance conditions, mechanically active substance conditions and mechanical conditions specified in this part are based on the corresponding provisions of GB4798.3-1990 and GB4798.4-1990, combined with the provisions of dry hot desert environmental conditions:
A, 1.2 The codes of environmental condition levels are arranged in descending order according to the severity of the environmental parameters. Large numbers indicate high severity, and high severity levels include low severity levels. A.1.3 Add some sections to classify dry hot desert environmental conditions. The main impacts of hot desert environmental conditions on electromechanical products are sand and dust, high temperature (air temperature and surface temperature), strong solar radiation (for products used outdoors) and large temperature differences. All types of products should select appropriate parameters according to their product characteristics and the impact of the use environment. For example, the maximum temperature of the environmental conditions of thermal protection relays and certain electronic products that are sensitive to high temperatures should be selected as the extreme maximum value: the maximum temperature of products that will be affected by overflow can be selected as the multi-year average of the maximum temperature: internal combustion engines and other products that require air input for combustion must consider the impact of sand: products used in outdoor environments must consider the impact of strong solar radiation, and the impact of wind and sand landforms on transportation machinery is the most obvious.
A.1, 4 Special climatic conditions, biological conditions, chemically active substance conditions, mechanically active substance conditions and mechanical environmental conditions are all determined based on the local environmental conditions around the product when it is used to determine whether they need to be considered in product design and selection, so as to select the appropriate product protection type.
A,2 Applicable places
A.2.1 Climate conditions
See Table A,1 for climate conditions and applicable places. Table A.1 Climate conditions and applicable places
Climate condition environment code
A.2.2 Special climate conditions
Applicable places
Places with condensation protection such as electrical screwing rooms, generator rooms, sand-proof pavilions and indoor living facilities without adjustment in desert areas
Drilling platforms at the edge of sand molds, window air conditioners, some cable laying places, oil tanks and other places without climate protection Drilling platforms, window air conditioners, some cable laying places, oil tanks and other places without climate protection in the hinterland of the desert Special climate conditions refer to the additional heat, wind speed and various water sources caused by production conditions or other reasons. These environmental parameters are not caused by simple climate conditions: special climate conditions include heat radiation, surrounding air movement and water sources other than rain. The application site is selected according to Table 2.
A.2.3 Biological conditions
Applicable sites for biological conditions:
3B1 level is applicable to climate-protected sites without biological hazards: -32 level is applicable to climate-protected sites with rodents and other animals that endanger products (except household ants): -4B1 level is applicable to climate-free sites with rodents and other animals that endanger products (except H ants). GB/T 19608.2—2004
A.2.4 Chemically active substances conditions
Chemically active substances refer to corrosive gases discharged from mud control systems and heating systems. Under certain humidity conditions (such as the surrounding, internal splashing and spraying conditions of the solid control system), the relative condensation degree may reach more than 70%. These gases will quickly corrode the metal, destroy the appearance of the product and hinder the normal operation of the equipment. Suitable places for chemical active substances:
33, 34 grades are suitable for places with climate protection where heavy chemical corrosive substances are produced, such as generator rooms, drilling platforms, etc.: 43, 4C4 grades are suitable for places without climate protection where there are serious chemical corrosion media, such as openings, mud solid control systems, etc.
A.2.5 Mechanically active substances conditions
Mechanically active substances conditions Applicable places:
3S3.3S4 grades are suitable for places with climate protection in dry hot sand film areas, .…~4S3.4S4 grades are suitable for places without climate protection in hot sand areas.A 2.6 Mechanical environmental conditions Mechanical environmental conditions Applicable places A.2 Table A2 Mechanical environmental conditions Applicable places Mechanical environmental conditions Code 3M1, 3M2. 4M1, 4M2 3M3. 3M4. 4M3. 4M4 3M5, 3M6, 4M5. 1M6 3M7, 3M8 4M7, 4M8 A.2.7 Sandy landforms Applicable places Places with low probability of perturbation and impact or places with anti-vibration and anti-impact measures Areas where vibration is caused by machinery or vehicles Places where the impact is caused by blasting, piling, etc. Places where the machine or vehicle causes vibration or nearby machines, conveyor belts, etc. The product is directly installed on the machine, and the machine itself causes large energy vibration and impact. The dry hot desert (Taklimakan Desert) covers an area of 337,000 square kilometers, and mobile sand dunes account for 85% of the entire area. Two environmental parameters are engraved in the severity level of wind and sand landforms, namely the average sand dune height and sand dune density. The city selects the applicable places of severity levels D1 to D7 according to the actual situation. In addition, the distribution of sand dune density, the mathematical average content of various particle sizes of aeolian sand, and the change of desert sand concentration with increasing severity are given (see GB/T 4797.6-1995), for users' reference. A.2.8 Groundwater
Groundwater is abundant in the hot and dry sandy areas, with a general depth of 2In~-5. The water contains a large amount of mineralized substances, and the mineralization degree is generally 3g1~11 g/1, and it is higher in some areas.
The fluoride content in groundwater is relatively high, ranging from 1 mg/1 to ~5 mg/1, and the highest is 17.11 mg/1. In some groundwater, the magnesium content exceeds the living standard, and the nitrate content is more than 10 mg/1. The severity of the groundwater mineralization is stipulated as W1, W2, and W3. The applicable places are selected according to Table 10, A, 2. 9 Transportation
Products entering the desert must be subjected to harsh transportation conditions. According to the provisions of 13/104798.2-1996 standard, the main impact on products during desert transportation is mechanical conditions, namely vibration, drop, swing, etc. Other conditions such as climate, biological, and chemical active substances have relatively small impacts, and have been specified in the use environment conditions. This is not considered in the transportation conditions. The road conditions in the dry and hot sand area are very bad, and only 2M4 severity level is specified in the transportation conditions. A.3 Application example
The general environment representative of Le equipment expressed the special environmental conditions of outdoor use of the oil refinery in Huierle on the edge of the Karamak Desert in Xinjiang:3-1990. The corresponding clauses of GB4798.4-1990, combined wi
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