GB/T 19608.1-2022Classification of special environmental condition - Part 1: Dry heat (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 19608.1-2022 covers the environmental parameters of a dry heat environment and the severity levels a product is classified against for it — an overview of what such an environment consists of, then severity levels for each family of conditions: the climatic conditions marked K, the special climatic conditions marked Z, the chemically active substances marked C, the mechanically active substances marked S, the mechanical conditions marked M, and the biological conditions marked B. It applies to products stored, transported, handled and used in dry heat, and it notes that a location with climate protection may still be exposed to the outside climate. Heat by itself is only part of what a desert or an arid inland site does to equipment: the daily temperature swing, the solar load, the wind-blown sand and dust that grind seals and block filters, and the low humidity that changes how materials age all act together, and equipment specified only to a peak temperature still fails there. Naming a level from each family gives a designer and a purchaser one shorthand for the whole exposure. Part 1 of the series. Written for equipment designers, specifiers writing tenders for arid regions, and test houses setting conditioning programmes.

This document specifies the environmental parameters and severity classification of

products under dry heat environmental conditions.

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

and hot environments. Applicable items and levels can be selected according to the

environmental shock 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 environmental conditions are described by climatic environmental

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

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

and mechanical environmental conditions (M) respectively.

Environmental condition classification allows for possible combinations of various

environmental conditions. It can truly reflect the shock of environmental conditions on

product storage, transportation, loading-unloading, and use. 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) and mechanical environmental

conditions (M);

- 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. It is necessary to pay attention to whether the climatic

environmental conditions of the place with climate protection are affected by the

environment of the place without climate protection, especially the temperature and

solar radiation.

The severity levels of climatic environmental conditions are shown in Table 1.

1K10: Suitable for indoor storage under dry and hot environmental conditions, without

temperature and humidity control.

1K11: Suitable for outdoor sheltered storage under dry and hot environmental

conditions.

1K12: Suitable for storage without shelter outdoors under dry and hot environmental

conditions.

2K10: Suitable for climate-protected transport and loading-unloading in dry and hot

ambient conditions, without temperature and humidity control in unventilated

enclosures.

2K11: Suitable for transport and loading-unloading without weather protection in hot

and dry ambient conditions.

where industrial production activities are distributed throughout the area, or in cities

with heavy traffic.

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, with industrial

activities distributed throughout the region 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.

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.

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