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Self-spray valve system and the ring pipe network settings
Abstract: It is pointed out that in the implementation of the provisions of Sections 9.3.5 and 10.1.4 of the Code for Design of Automatic Sprinkler Systems, the position of the pressure relief valve should be set separately on both sides of the ring-shaped pipe, meanwhile the figure There is unreasonable phenomenon. The current "automatic sprinkler system design specifications" GB50084-2001 (hereinafter referred to as "spray rules"), has changed in many aspects, compared to the original " Spray gauge "is concerned, more perfect and reasonable. However, some new provisions in the implementation process to be explored, this article on the "spray rules" 9.3.5 and 10.1.4 in the words and illustrations to make their own views for colleagues to discuss. 1, the setting of pressure reducing valve Discussion "spray regulation" The new paragraph 9.3.5 The third paragraph is "When connecting two or more alarm valve group, should be set up spare valve", the provisions of the schematic diagram shown in Figure 1. The purpose of the pressure reducing valve for equipment in clause 9.3.5 is to maintain the normal water supply of the system when one of the pressure reducing valves is overhauled or damaged. From the set purpose, if it is connected to the pressure reducing valve filter or valve before and after the pipeline damage or overhaul, even if the backup decompression. Valve, the whole system or to stop water supply. From the whole system, spare valve is not necessary to achieve safe and reliable system of water supply. 2, ring pipe network settings "Spray rules" The new article 10.1.4 reads: "When the sprinkler system with two or more alarm valve group, the alarm valve group should be set before the annular water supply Pipeline ", the article shows the schematic shown in Figure 2. The purpose of setting up a ring-shaped water supply pipeline in Article 10.1.4 is to maintain the normal water supply of the system on the other side when pipes, valves or instruments on one side of the ring-shaped pipe network are being overhauled. From the set purpose, for more than two alarm valve set in parallel sprinkler system, alarm valve should be set before the ring pipe. Because of the early fire, automatic sprinkler system is better than fire hydrant efficacy, and fire hydrant in the indoor fire water is greater than 15L / s, requiring indoor pipe at least two water pipes are connected with different outdoor pipe loop pipe sections . Therefore, from the perspective of the safety and reliability of water supply, automatic sprinkler systems with two or more alarm valve groups installed in parallel are necessary for the alarm valve to be provided with a ring-shaped pipe. For other components connected in series to the wet system, although several sets of alarm valves are provided, there is no need to provide a ring-shaped pipe in front of the alarm valve due to the common water distribution trunk. In short, the alarm valve set ring before the water supply pipe system, such as the need to set the pressure relief valve should be set separately on both sides of the annular pipe, generally not equipment pressure relief valve. (Figure 1, the location and direction of the filter arrangement and the check valve position in Figure 2 are unreasonable, a reasonable layout shown in Figure 3) Of course, the management conditions are good, to ensure the regular replacement of pressure relief valve work case, but also Equipment can be used pressure reducing valve. It should be pointed out that bypass valves should not be provided around the pressure relief valve. 3 Conclusion In conclusion, I think the "spray gauge" 9.3.5 third and 10.1.4 should be made appropriate changes, the amended provisions can be merged into "When the sprinkler system has two and When the above alarming valve group is set in parallel, the annular water supply pipeline should be set before the alarming valve group; when the pressure reducing valve is needed, it should be set up separately on both sides of the annular pipe.