Grooved butterfly valves direct connect to pipe using iron pipe size couplings . grooved valves are easiest to install 管状蝶阀：采用铸铁管接头直接与管道连接。管状阀门安装最容易。
Sewage fittings ; technical specifications for delivery for fittings from cast iron , concrete and concrete in connection with cast iron 下水道管件.铸铁管件混凝土管件及与铸铁相连的混凝
Discharge and ventilating pipes and fittings , sand - cast or spun in cast iron - specification for spigot and socket systems 砂型铸造或离心铸造的排水和通风铸铁管及管件.第1部分:插承套管系统规范
Cast iron pipes and fittings , their joints and accessories for the evacuation of water from buildings . requirements , test methods and quality assurance 建筑物排水用铸铁管管件及其接头和附件.要求试验方法和质量保证
Cast iron pipes and fittings , their joints and accessories for the evacuation of water from buildings - requirements , test methods and quality assurance 建筑物排水用铸铁管和配件及其接头和附件.要求试验方法和质量保证
Depend on the invalidation of the current network ' s statistic ; this thesis selected the gray cast iron pipes as the main object to research 根据对目前国内管网失效情况的统计，本文确定灰口铸铁管管壁强度可靠度作为主要研究对象。
We find that the cast - iron pipe is only mildly corrosive and the indoor pipeline is just rust - eaten , but the seamless steel pipe corrodes badly 结果表明：主干线灰口铸铁管整体状况良好，只有局部轻度腐蚀；庭院无缝钢管腐蚀较严重；户内管道大多存在不同程度的锈蚀。
The ceramic - lined steel composite pipes are lighter than alloy pipes , cast iron pipes , and cast stone pipes , which reduces the expense of transportation and makes the pipes easier to install 陶瓷内衬复合钢管与钢管、耐磨合金铸管、铸铁管和铸石管比较，相对重量轻，便于运输和安装。
Considering the electrovalence , the curve of water consumption and the reliability of water supply , this paper respectively sets up the model based on the maximal flux and the model based on the expectation flux . it takes yearly expenditure converting value and yearly cistern converting value as target function and takes continuity equation , velocity of flow and compression resistance of cast iron pipeline as restrictions and sets up the pga model on optimal design of water supply networks 考虑到峰谷电价、用水量变化曲线及用水可靠性因素的影响，分别建立了以最高时流量设计管网的模型和以期望时流量设计管网的模型，以年费用折算值加上清水池年造价折算值为目标函数，以连续性方程、管中流速和铸铁管耐压值等为约束条件，进行并行遗传算法对给水管网优化设计的实现。
In recently years , application of new type plastic supply - drain pipe material gets more and more wide spread , it has great progress in our country for production and construction technique of many new type supply - drain pipe materials and component , and relevant material type from zinc - planting - corrugated pipe and iron pipe become to upvc , pp - r , pe - x , pb , pp - c and plastic - alumium , abs and so on 近年来新型塑料给排水管材在建筑给排水中的应用越来越广泛，我国的各种新型给排水管材、管件的生产技术和施工技术有了很大的发展，相应的材料种类也由镀锌钢管、铸铁管变为upvc 、 pp - r 、 pe - x 、 pb 、 pp - c 、铝塑复合管( pap ) 、 abs等等。
