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GB/T 19724-2020Forestry machinery - Portable chainsaws and brush-cutters - Exhaust system-caused fire risk (English PDF)

林业机械便携式油锯和割灌机易引起火险的排放系统

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Issued by

State Administration for Market Regulation, China National Standardization Administration

Level / Type

National · Recommended

Issue date

April 28, 2020

Implementation date

April 28, 2020

Scope

GB/T 19724-2020 is the English-translated version of 林业机械便携式油锯和割灌机易引起火险的排放系统.

GB/T 19724-2020 is the Chinese standard "Forestry machinery - Portable chainsaws and brush-cutters - Exhaust system-caused fire risk". Its scope clause reads: This standard stipulates the technical requirements and test methods of the fire-prone discharge system in portable chain saws and brush cutters.

Technical requirements include. --- The maximum temperature of the exhaust gas and the surface of the exhaust system; --- The maximum aperture size of the screen-type Mars suppressor; --- Restrictions on sediments; --- Durability and reliability requirements.

Test methods include. --- Test methods for exhaust gas and exhaust system surface temperature; --- The determination method of the size of the screen mesh Mars suppressor.

Note. Except for screen-type Mars suppressors, this standard does not specify a method for measuring the limit size of carbon particles in emissions. Its clauses include terms and definitions.

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Document preview — GB/T 19724-2020

National Standard of the People's Republic of China

ICS: 65.060.80
Classification: B 95
Replacing: GB 19724-2005

Issued by: State Administration for Market Regulation, China National Standardization Administration

1 Scope
2 Normative references
3 Terms and definitions
3.1 Exhaust system
3.2 Power head
3.3 Contact plane

1 Scope

This standard stipulates the technical requirements and test methods of the fire-prone discharge system in portable chain saws and brush cutters.

Technical requirements include.

--- The maximum temperature of the exhaust gas and the surface of the exhaust system;

--- The maximum aperture size of the screen-type Mars suppressor;

--- Restrictions on sediments;

--- Durability and reliability requirements.

Test methods include.

--- Test methods for exhaust gas and exhaust system surface temperature;

--- The determination method of the size of the screen mesh Mars suppressor.

Note. Except for screen-type Mars suppressors, this standard does not specify a method for measuring the limit size of carbon particles in emissions.

2 Normative references

The following documents are essential for the application of this document. For dated references, only the dated version applies to this article

Pieces. For the cited documents without date, the latest version (including all amendments) applies to this document.

ISO 7293 Forestry machinery portable chain saw engine performance and fuel consumption (Forestrymachinery-Portablechain saws-Engineperformanceandfuelconsumption)

ISO 8893 forestry machinery portable brush cutter and lawn mower engine performance and fuel consumption (Forestrymachinery-

Portablebrush-cuttersandgrass-trimmers-Engineperformanceandfuelconsumption)

3 Terms and definitions

The following terms and definitions apply to this document.

3.1 Exhaust system

Exhaust gas flows from the exhaust port of the cylinder to all components that flow into the air, including all overheated surface protection components.

3.2 Power head

For chain saw refers to the remaining part after removing the guide plate and saw chain; for brush cutter refers to the removal of the drive shaft assembly and cutting accessories or other removable

After installing the additional parts.

3.3 Contact plane

An imaginary plane defined by at least three points touching the end of the power head (see 6.2).

LY/T 1346 | GB 16151.12 | GB/T 21962 | GB/T 19725.2 | GB/T 19725.1 | […]

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 17 pages — is available in the English PDF.

Referenced standards

Normative references

ISO 7293 · ISO 8893

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