GB/T 19608.2-2022Classification of special environmental condition - Part 2: Dry heat-desert (English PDF)

Foreword

This document was issued on 11 July 2022 by the State Administration for Market Regulation; Standardization Administration of the PRC and takes effect on 1 February 2023.

It is a GB/T standard: recommended rather than compulsory, but it is the text a Chinese reviewer applies when assessing a submission.

1 Scope

GB/T 19608.2-2022 grades the dry heat desert environment into severity levels, so that a product to be stored, transported, handled or used there can be specified against defined conditions instead of against the general label desert. After an overview of how the conditions combine, it takes them family by family: climatic conditions, the special climatic conditions that separate a desert from an ordinary hot dry climate, chemically active substances, mechanically active substances, mechanical conditions, biological conditions, and wind sand landform. An informative annex describes other desert environments for comparison. The classification exists because desert damage is not one stress but several acting together. Airborne sand and dust abrade surfaces and pack into bearings, filters and connectors; the daily temperature swing works seals, joints and solder far harder than the peak temperature alone; solar radiation degrades polymers, elastomers and coatings; and salt-bearing ground attacks whatever rests on it. Equipment qualified only against a high temperature figure comes back from desert service with worn seals, blocked cooling paths and jammed mechanisms, none of which the temperature rating predicted. Naming a level for each family lets a purchaser write one line into a specification and lets a laboratory build a matching qualification programme. Equipment designers, purchasers drafting environmental clauses and test laboratories use it, with the terminology of GB/T 20625.

This document specifies the environmental parameters and severity classification of the

product under the dry heat desert environment.

This document applies to products stored, transported, handled and used in dry heat

desert conditions. The items and levels used can be selected according to the

environmental impact and degree of the product.

2 Normative references

The following referenced documents are indispensable for the application of this

document. For dated references, only the edition cited applies. For undated references,

the latest edition of the referenced document (including any amendments) applies.

GB/T 4798.10, Environmental conditions existing in the application of electric and

electronic products - Guidance

GB/T 20625, Special environmental condition - Terminology

3 Terms and definitions

For the purposes of this document, the terms and definitions defined in GB/T 20625

apply.

4 Overview of environmental conditions

The dry heat desert environmental conditions are composed of climatic environmental

conditions (K), special climatic environmental conditions (Z), biological environmental

conditions (B), chemically active substances (C), mechanically active substances (S),

mechanical environmental conditions (M), wind sand landform (D) are described by

levels respectively.

This grading allows for possible combinations of various environmental conditions.

These environmental conditions have an impact on products stored, transported and

used anywhere. It can truly reflect the environmental conditions caused by the outdoor

climate during the process. For some environmental parameters, it is difficult to

quantify its severity level.

According to GB/T 4798.10, the environmental condition level is characterized by the

following identifications:

- The first digit identifies the application condition (1 means storage; 2 means

transportation and loading-unloading; 3 means fixed use in places with climate

protection; 4 means fixed use in places without climate protection);

- Letters: Climatic environmental conditions (K), special climatic environmental

conditions (Z), biological environmental conditions (B), chemically active

substances (C), mechanically active substances (S), mechanical environmental

conditions (M), wind sand landform (D);

- Another digit identifies the severity. Generally, the larger the value, the more severe

the condition. A level can be further divided into H (high) and L (low). For example,

temperatures may be very low, but high ambient conditions will not occur.

Example: Level 2K3, in which: 2 means transportation and loading-unloading; K means

climatic environmental conditions; 3 means severity level.

5 Severity level for various environmental conditions

5.1 Climatic environmental conditions (K)

Choose the right level. Attention shall be paid to whether the climatic environmental

conditions of places with climate protection are affected by the outdoor environment

(places without climate protection), especially temperature and solar radiation.

The severity level of climatic environmental conditions is shown in Table 1. See Annex

A for other desert environmental conditions.

1K20: Suitable for indoor storage in dry heat desert environmental conditions, without

temperature and humidity control.

1K21: Suitable for outdoor sheltered storage in dry heat desert conditions.

1K22: Suitable for outdoor storage without shelter in dry heat desert conditions.

2K20: Suitable for climate-protected transport and loading-unloading in dry heat desert

environmental conditions, without temperature and humidity control in unventilated

boxes.

2K21: Suitable for transport and loading-unloading without weather protection in dry

2C3: Suitable for transportation and loading-unloading in areas close to industrial

chemical pollution sources.

3C1: Suitable for indoor stationary use in rural and urban areas with low industrial

activity and moderate traffic. Heating in dense urban areas in winter can lead to

increased pollution.

3C2: Suitable for indoor stationary use with general pollution levels, where industrial

production activities are distributed throughout the area, or in cities with heavy traffic.

3C3: Suitable for indoor stationary use near industrial sources of chemical emissions.

3C4: Suitable for indoor fixed use in industrial production plants, where high

concentrations of chemical pollutants may occur.

4C1: Suitable for outdoor fixed use in rural and urban areas with a small amount of

industrial pollution and low traffic.

4C2: Suitable for outdoor fixed use in cities with industrial pollution and heavy traffic.

4C3: Suitable for outdoor fixed use close to chemical pollution sources.

4C4: Suitable for outdoor fixed use in industrial processing plants. Chemical pollutant

emissions are in high concentrations.

NOTE: The chemically active substances in the dry heat desert environment mainly exist in the

corrosive gases discharged from industrial facilities such as oil and gas fields and the heating

systems of surrounding towns and villages. Under certain humidity conditions (for example, at and

around the mud solids control system, splash water and water spray conditions in the shed, the

relative humidity may reach more than 70%), these gases will accelerate metal corrosion. Therefore,

the chemically active substance conditions are suitable for the dry heat desert environment.

2S2: Suitable for transport and loading-unloading where limited (anti-sand) measures

have been taken to minimize the presence of sand and dust, such as enclosed transport

and loading-unloading.

2S3: Suitable for unenclosed transport and loading-unloading near sources of sand and

dust, where no special precautions are taken to reduce the presence of sand and dust.

2S4: Suitable for transportation and loading-unloading in sand and dust areas.

3S1: Suitable for closed indoor fixed use where dust-proof measures have been taken

to reduce the dust content to a minimum.

3S2: Suitable for closed indoor fixed use without special protective measures to

minimize the content of dust and sand, but the place is not located near the source of

dust or sand.

3S3: Suitable for closed indoor fixed use close to sand and dust sources, including

places where sand or dust content is minimized in urban areas.

4S1: Suitable for outdoor fixed use where dust-proof measures have been taken to

minimize the dust content.

4S2: Suitable for outdoor fixed use without special protective measures to minimize the

content of dust and sand, but the place is not located near the source of dust or sand.

4S3: Suitable for places close to the source of sand and dust, including fixed outdoor

use in urban areas without special protective measures to minimize the content of dust

and sand. It is also suitable for outdoor stationary use not affected by natural dust storms

or important industrial activities.

4S4: Suitable for outdoor fixed use with windy sand and dust in the air caused by natural

conditions or industrial activities.

Annex A

(informative)

Other desert environments

Desert environments are widely distributed in the world. The dry heat desert

environment in northwestern China belongs to the high latitude desert environment.

The tropical desert environment distributed in the Arabian Peninsula of West Asia and

the Sahara region of Africa belongs to the low-latitude desert environment. Its climatic

and environmental conditions are different from the dry heat desert environment.

See Table A.1 for the severity level of climatic environmental conditions in the dry heat

desert environment.

1K50: Suitable for indoor storage in tropical desert environmental conditions without

temperature and humidity control.

1K51: Suitable for outdoor sheltered storage in tropical desert environmental conditions.

1K52: Suitable for outdoor unshielded storage in tropical desert environmental

conditions.

2K50: Suitable for weather-protected transport and loading-unloading in tropical desert

environmental conditions, without temperature and humidity control in unventilated

enclosures.

2K51: Suitable for transport and loading-unloading without weather protection in

tropical desert environmental conditions.

3K51: Suitable for stationary use with climate protection in tropical desert

environmental conditions, without temperature and humidity control.

4K50: Suitable for fixed use outdoors with shelter in tropical desert conditions.

4K51: Suitable for fixed use outdoors without shelter in tropical desert environmental

conditions.

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