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问下给水管道设计压力是多少？

问下给水管道设计压力是多少？

浏览：66次 | 提问时间： 08-03 08:45

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纸贵金迷 08-03 08:46

按照中华*共和国*标准给水排水管道工程施工及验收规范GB 50268-20089.2 压力管道水压试验9. 2.1 水压试验前，施工单位应编制的试验方案，其内容应包括:1 后背及堵板的设计;2 进水管路、排气孔及排水孔的设计;3 加压设备、压力计的选择及安装的设计;4 排水疏导措施;5 升压分级的划分及观测制度的规定;6 试验管段的稳定措施和安全措施。9.2.2 试验管段的后背应符合下列规定:1 后背应设在原状土或人工后背上，土质松软时应采取加固措施;2 后背墙面应平整并与管道轴线垂直。9.2.3 采用钢管、化学建材管的压力管道，管道中最后一个焊接接口完毕一个小时以上方可进行水压试验。9.2.4 水压试验管道内径大于或等于600mm时，试验管段端部的第一个接口应采用柔性接口，或采用特制的柔性接口堵板。9.2.5 水压试验采用的设备、仪表规格及其安装应符合下列规定:1 采用弹簧压力计时，精度不低于l. 5级，最大量程宜为试验压力的1.3-1.5倍，表壳的公称直径不宜小于150mm，使用前经校正并具有符合规定的检定*:2 水泵、压力计应安装在试验段的两端部与管道轴线相垂直的支管上。9. 2.6 开槽施工管道试验前，附属设备安装应符合下列规定:l 非隐蔽管道的固定设施已按设计要求安装合格;2 管道附属设备已按要求紧固、锚固合格:3 管件的支墩、锚固设施混凝工强度已达到设计强度;4 未设置支墩、锚固设施的管件，应采取加固措施并检查合格。9.2.7 水压试验前，管道回填土应符合下列规定:1 管道安装检查合格后，应按本规范第4. 5. 1条第1款的规定回填土;2 管道顶部回填土宜留出接口位置以便检查渗漏处。9. 2.8 水压试验前准备工作应符合下列规定:1 试验管段所有敞口应封闭，不得有渗漏水现象:2 试验管段不得用闸阀做堵板，不得含有消火栓、水锤消除器、安全阀等附件;3 水压试验前应清除管道内的杂物。9.2.9 试验管段注满水后，宜在不大于工作压力条件下充分浸泡后再进行水压试验，浸泡时间应符合表9.2.9的规定:2 顶试验阶段:将管道内水压缓缓地升至试验压力并稳压30min.期间如有压力下降可注水补压，但不得高于试验压力;检查管道接口、配件等处有无漏水、损坏现象;有漏水、损坏现象时应及时停止试压，查明原因并采取相应措施后重新试压。3 主试验阶段;停止注水补压，稳定15min;当15min后压力下降不超过表9.2.10-2中所列允许压力降数值时，将试验压力降至工作压力并保持恒压30min，进行外观检查若无漏水现象.则水压试验合格。4 管道升压时，管道的气体应排除;升压过程中，发现弹簧压力计表针摆动、不稳，且升压较慢时，应重新排气后再升压。5 应分级升压，每升一级应检查后背、支墩、管身及接口，无异常现象时再继续升压。6 水压试验过程中，后背顶撑、管道两端严禁站人。7 水压试验时，严禁修补缺陷:遇有缺陷时，应做出标记.卸压后修补。即说明钢管的试验压力为工作压力+0.5MPa,且不小于0.9MPa希望我的回答能够帮助到您

Mn唇 08-03 08:54

按照*建设部管网供水压力服务规范要求，城市供水服务压力为0.14兆帕斯卡，这个压力只能保证供水到3—4层楼；而四楼以上的供水属二次供水的范畴。一般城市目前管网平均压力达到0.30MPa以上，远远高于*标准，基本能够满足6层楼用户水压要求，但从安全运行角度考虑，个别6层或6层以上用户由于所处地理位置较高，公共供水管道水压不能满足用户使用要求时，必须增加二次供水设施。

疤只是疤弄得在完整都还在 08-03 09:02

水压试验压力是设计压力的1.5倍，设计压力约为工作压力的1.1倍关系。压力试验的目的是检验压力容器、压力管道承压部件的强度和严密性。在试验过程中，通过观察承压部件有无明显变形或破裂，来验证压力容器是否具有设计压力下安全运行所必需的承压能力。同时，通过观察焊缝、法兰等连接处有无渗漏，检验压力容器的严密性。由于压力试验的试验压力要比最高工作压力高，所以应该考虑到压力容器在压力试验时有破裂的可能性。由于相同体积、相同压力的气体*时所释放出的能量要比液体大得多，为减轻锅炉、压力容器在耐压试验时破裂所造成的危害，所以通常情况下试验介质选用液体。因为水的来源和使用都比较方便，又具有作耐压试验所需的各种性能，所以常用水作为耐压试验的介质，故耐压试验也常称为水压试验。希望我的回答对您有所帮助。

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