推荐回答（1个）
室外给水管道设计系统的选择应根据当地地形、水源情况、城镇规划、供水规模、水质及水压要求，以及原有给水工程设施等条件，从全局出发，通过技术经济比较后综合考虑确定。下面一起来看看室外给水管道设计规范有哪些吧!
一、室外消防给水管网应布置成环状。在建设初期，采用环状管网有困难时，可采用枝状管网，但考虑将来有连成环状管网的可能。同时在消防用水量较大的单位(例如消防用水量超过20l/s)，应设消防水池。一般居住建筑和企业单位内，如果消防用水量不大，例如消防用水量小于15L/s，设置环状管网有困难时，可采用枝状管网，火场用水安全问题可由消防队采取相应措施予以保证。
二、环状管网的输水干管及向环状管网输水的输水管均不应少于两条，当其中一条发生故障时，其余的干管应仍能通过消防用水总量。
三、为确保火场用水，避免因个别管段损坏导致管网供水中断，环状管道应用阀门分成若干独立段，每段内消火栓的数量不宜超过5个。管网上的消防阀门设置应在管网节点处按“n-1”原则进行(n为管网段数，如三通管处需布置的阀门数为3-1=2个)，并以两阀门间的管道上消火栓数量不超过5个进行效核。若超过5个时，应增加消防阀门。
四、在设计企业单位室外消防给水管网时，应按同一时间内的火灾次数，将着火点消防用水量布置在管网的最不利进行计算。当生产、生活用水量达到最高日最大小时流量时，仍应保证消防用水秒流量。
五、室外消防给水管道的最小直径不应小于100mm。六、室外消防给水管道内的流速不宜大于2.5m/s。七、在企业单位内消防管网与生产管网分为两个独立的给水系统时，在不引起生产事故的前提下，低压消防管网与生产管网可用连接管连接，或在生产管网上设置消火栓，将生产管网作为消防管网的备用水源。但生产用水转为消防用水时，启闭的阀门数不应超过两个，且不应超过5min。应该指出的是在消防给水系统设计时，生产管网的水源不应作为消防用水的主要水源，消防管网的流量仍需满足用水量的要求。
以上即是关于室外给水管道设计规范的全部介绍，管道设计布置应统筹规划,做到安全可靠、经济合理、满足施工、操作、维修等方面的要求,并力求整齐美观!
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