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GB 7956.6-2015 English PDF (GB7956.6-2015)

GB 7956.6-2015 English PDF (GB7956.6-2015)

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GB 7956.6-2015: Fire fighting vehicles -- Part 6: Compressed air foam system fire fighting vehicle

This Part of GB 7956 specifies the terms and definitions, technical requirements, test methods, inspection rules as well as symbols, packaging, transportation and storage of the compressed air foam system fire fighting vehicle.
GB 7956.6-2015
GB
NATIONAL STANDARD OF
THE PEOPLE REPUBLIC OF CHINA
ICS 13.220.10
C 84
Fire fighting vehicles -
Part 6. Compressed air foam system fire fighting vehicle
ISSUED ON. OCTOBER 9, 2015
IMPLEMENTED ON. JANUARY 1, 2016
Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the PEOPLE Republic of China;
Standardization Administration of the PEOPLE Republic of
China.
3. No action is required - Full-copy of this standard will be automatically & immediately delivered to your EMAIL address in 0~60 minutes.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 5
4 Technical requirements ... 6
5 Test methods ... 20
6 Inspection rules ... 37
7 Symbols, packaging, transport and storage ... 40
Foreword
Chapter 4, Chapter 6 and Section 7.1 in this Part of GB 7956 are mandatory, while the rest is recommended.
GB 7956 Fire fighting vehicles is divided into the following parts.
?€? Part 1. General technical specifications;
?€? Part 2. Water tank fire fighting vehicle;
?€? Part 3. Foam fire fighting vehicle;
?€? Part 4. Dry powder fire fighting vehicle;
?€? Part 5. Gas fire fighting vehicle;
?€? Part 6. Compressed air foam system fire fighting vehicle;
This Part is Part 6 of GB 7956.
This Part was drafted in accordance with the rules given in GB/T 1.1-2009. This Part was proposed by the Ministry of Public Security of the PEOPLE Republic of China.
This Part shall be under the jurisdiction of the Technical Subcommittee of Fire Pumps of the National Technical Committee for Standardization of Fire
Protection (SAC/TC 113/SC 4).
Drafting organization of this Part. Shanghai Fire Research Institute of MPS. Main drafters of this Part. Jiang Xudong, Xue Lin, Wang Lijing, Zhu Yun, Wan Ming, Hu Yong and Cui Xiaofeng.
Fire fighting vehicles - Part 6. Compressed air
foam system fire fighting vehicle
1 Scope
This Part of GB 7956 specifies the terms and definitions, technical requirements, test methods, inspection rules as well as symbols, packaging, transportation and storage of the compressed air foam system fire fighting vehicle.
This Part is applicable to the compressed air foam system fire fighting vehicle. 2 Normative references
The following documents are essential to the application of this document. For dated references, only the editions with the dates indicated are applicable to this document. For undated references, only the latest editions (including all the amendments) are applicable to this document.
GB/T 3181 Color standard for paint film
GB 4351.1-2005 Portable fire extinguishers - Part 1. Performance and
construction
GB 6245-2006 Fire pumps
GB 6969 Rubber suction hose for fire-fighting purpose
GB 7956.1-2014 Fire fighting vehicles - Part 1. General technical
specifications
GB 19156 General specifications for fire monitors
GB 25202-2010 Foam nozzle
GB 27897 Class A foam extinguishing agent
JB/T 6441 Safety valves for compressor
3 Terms and definitions
The following terms and definitions and those defined in GB 7956.1-2014 are applicable to this document. For ease of use, some of the terms and definitions in GB 7956.1-2014 are repeated below.
3.1 Compressed air foam system fire fighting vehicle
It refers to the fire fighting vehicle mainly equipped with a water tank and a foam tank, and injecting foam for fire protection through the compressed air foam system.
[Definition in Section 3.1.8 of GB 7956.1-2014]
3.2 Compressed air foam system; CAFS
It refers to the device that is mainly composed of a fire pump, a compressed air system, a foam proportioning system, an injection device, a piping system, etc., and that is able to generate compressed air foam.
3.3 Foam proportioning system
It refers to the system that is composed of a foam proportioner, a foam pump, a control device, a piping device and other components, and that is able to mix water and foam concentrate in a certain proportion.
3.4 Class A foam
It refers to the foam mainly used for fighting Class A fires.
3.5 Dry foam
It refers to the Class A foam with a foam expansion ratio of not less than 10 times and a mixing ratio of not more than 1%, which is able to be stably attached to a vertical wall within a specified period of time.
3.6 Wet foam
It refers to the Class A foam with a foam expansion ratio of less than 10 times, a mixing ratio of not less than 0.2% and better flowability.
3.7 Nozzle for Class A foam
It refers to the fire-fighting nozzle with a nozzle diameter of not less than 19mm, which is used for injecting Class A dry and wet foam.
injection of dry and wet foam, and shall ensure that at least two nozzles for Class A foam are used at the same time.
4.4.1.1.2 When the compressed air foam system injects wet foam at the rated outlet pressure, the flow rate of the mixture injected by a fire monitor shall not be less than 8L/s, and the flow rate of the mixture at each injection outlet, except for the fire monitor, shall not be less than 3L/s. When the compressed air foam system injects dry foam at the rated outlet pressure, the flow rate of the mixture at each injection outlet, except for the fire monitor, shall not be less than 1.5L/s. 4.4.1.1.3 The compressed air foam system shall not switch between dry state and wet state and regulate the system?€?s outlet pressure by regulating the valve opening at the distal end of the outlet.
4.4.1.1.4 The compressed air foam system shall be possessed of automatic pressure balance function that is able to automatically control the difference between the outlet pressure of the compressed air system and the pressure of the fire pump within the range of 15% over the entire operating range.
4.4.1.1.5 The compressed air foam system shall be provided with a device for releasing the residual pressure after the system has ceased to run. This device shall be located in a convenient position for operation.
4.4.1.1.6 The compressed air foam system shall be possessed of cleaning function that is able to automatically clean the foam proportioning system and the pipelines, and shall prevent the residual fluid in the pipelines being cleaned from flowing into the foam tank or water tank in the cleaning process. The cleaning operation switch shall be located on the control panel.
4.4.1.1.7 The compressed air foam system shall have no leakage when
operating at the maximum allowable operating pressure and flow conditions. 4.4.1.1.8 The pipelines of the compressed air foam system shall be provided with means for preventing water, compressed air and foam backflow.
4.4.1.1.9 The pipelines of the compressed air foam system shall be
distinguished by different colors. The compressed air pipelines shall be black. The fire pump?€?s water inlet pipelines and the water transmission pipelines from the water tank to the fire pump shall be G05 dark green specified in GB/T 3181. The fire pump?€?s water outlet pipelines shall be R03 bright red. The liquid transmission pipelines from the foam tank to the foam pump shall be Y08 dark yellow.
4.4.1.2 Performance requirements
4.4.1.2.1 Power matching performance
4.4.2.1 At the rated outlet pressure, the rated flow rate of the compressed air system shall not be less than 12 times the sum of the flow rates of the mixture at the outlets during the injection of dry foam, and shall not be less than 6 times the sum of the flow rates of the mixture at the outlets during the injection of wet foam.
4.4.2.2 The compressed air system shall be equipped with the safety valve in line with the provisions of JB/T 6441. The operating pressure of the safety valve shall be 1.1 to 1.15 times the rated outlet pressure of the compressed air system. The safety valve shall be able to reset automatically after the pressure has returned to normal. The oil storage tank for the air compressor of the
compressed air system shall be conducted with the bursting test. The burst pressure shall not be less than 3.5 times the maximum outlet pressure of the air compressor. Rupture shall not produce debris. The burst shall not occur on the heads, longitudinal welds and their fusion lines, and circumferential welds (except for the burst perpendicular to the circumferential welds).
4.4.2.3 The compressed air system shall be conducted with the reliability test. During the test, the system shall function properly, and the air compressor shall not give an overheating alarm.
4.4.2.4 When the compressed air system is equipped with a heat exchanger, the heat exchanger shall be installed in such a position as to ensure that it does not cause burns to the normal operator, otherwise a heat insulation device shall be installed. During normal operation of the compressed air system, the surface temperature of the heat insulation device shall not be greater than 60??C. 4.4.3 Foam proportioning system
4.4.3.1 Parts that are in direct contact with the foam concentrate shall be made of copper alloy or of ma...

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