【 Weak current College 】 on hanging Superfine dry powder fire extinguishing device layout spacing

Since 2003 our independent research and development of the hanging of ultra-fine powder extinguishing appliances (formerly pulse ultra fine dry powder extinguishing device) since its introduction, its fire case showed a "rapid response, early suppression, efficient fire" features is gradually being accepted the majority of users. Shanxi, Henan, and Anhui Provinces of the hanging dry powder fire extinguishing device "design, installation, acceptance of" local standards unveiled, its scope of application and use the methods also matures. In 2006, the Ministry of public security issued GA602-2006 the hanging dry powder fire extinguishing device "industry standard, unified naming patterns, it is understood that the hanging of fine dry powder fire extinguishing device design, installation, acceptance of national standards are forthcoming, will further specification for hanging the Superfine powder extinguishing devices.

Hanging Superfine dry powder fire extinguishing device can be applied in the distribution Cabinet, channel, cable, mezzanine, cable tunnels, radio stations and other unattended and traditional methods do not resolve. Through a number of experimental data demonstrated in cable tunnels, storage warehouses, cable design of some of the mezzanine, does not guarantee that the ultra-fine powder of effective fire extinguishing concentration and Jet strength, thus cannot effectively achieve fire effect. The main reason is that some manufacturers designers to ideally get experimental performance data directly to complex utility sites, such as: the same ultra-fine powder, different manufacturers announce fire parameters vary greatly, there are 65 grams/cubic meters, 100 grams/cubic meters, there are 148 g/m³ [GA578-2005 the ultra-fine powder extinguishing agent provides for 150 g off a cubic metres of fire model], because the fire model is developed by the enterprises themselves, so the fire model shape on the consumption of ultra-fine powder extinguishing agent has a great effect. In the closed state with different fire model made fire testing, the results are as follows: Superfine powder dosage model size start extinguishing agent concentration method length 1 m, width 1 m, height 10 m 500 g pulse jet 5/5 fire extinguishing success 50 grams/cubic metre long 1.4 metres wide 1.4 m, height 5 m 500 g pulse Jet 2/5 fire extinguishing success-10 m, width 1 m, 1 m 500 g pulse jet 5/5 fire extinguisher was not successful-it can be seen, in particular the model state of extinguishing agent dosage should not be taken as a basis for widespread use, the design parameters of the formula to inappropriate enterprise will fire testing of magic, expanded product fire extinguishing performance, deceived users.

In developed countries the use of science-based design methods that use site building fire model, came to the experimental data and specific applications. To better serve the community, Cosco fire equipment co., Ltd. established cable tunnels, storage warehouses, cable shaft, power distribution Cabinet, entities such as the engine compartment model of fire. Through extensive storage pressure and non-storage pressure hanging ultra-fine powder extinguishing equipment for fire testing proved that the decision suspended extinguishing Superfine powder plant, not only is the extinguishing agent concentration, and extinguishing gas pressure. Thus, the new national standard introduced Jet strength (spray density) concept, which is to ensure protection of ultrafine powder can range to a certain concentration and speed up the fire to reach the fire-fighting purposes.

To make sure that the Jet strength would be necessary to determine the distance between the fire-fighting equipment. We use different manufacturers page〈 hanging fire extinguishing device Superfine powder equipment > conducted experimental fire entity model, verify that the installation of large space in the hanging of fine dry powder fire extinguishing installations of spacing should be:

1. warehouse and electromechanical equipment of the fire extinguishing device between sets should be square and rectangular layout at the top of the protection object to a square layout should not be greater than the length, arrangement of rectangular 2.5m side should not be greater than 3m, installation height should not be greater than 6m.

2. cable tunnel setting of fire suppression equipment, layout along the cable tunnel should be in the top middle position, the spacing between the fire-fighting equipment should not be greater than 3m.

3. cable sandwich set fire suppression equipment, both sides along the cable tray layout in the mezzanine, the spacing between the fire-fighting equipment should not be greater than 2.5m.

Also, the actual volume divided by fire suppression equipment marked with the protected volume design method is not desirable.