废水treatment plant upgrades happen all the time because owners are constantly improving efficiency, expanding capacity, and striving for better environmental stewardship. Not surprisingly, while the upgrades themselves are site specific, the issues encountered from one place to another are similar. Upgrades often have to accommodate pipes and components that have been in service for some time, and that can pose challenges. Add to that the need to manage movement from settlement, accommodate seismic events, and address corrosion, what appears to be a straightforward undertaking can suddenly become anything but simple.

管理运动

安装适应定居点或管道将其硬地基础与具有软基础的区域连接起来并不罕见。大多数站点都经历了一定程度的和解,许多站点需要适应运动或偏转。

Since the 1880s, Bolted Sleeve-Type Couplings (BSTCs) for plain-end pipe have been used to manage deflection. Before welding was commonplace, BSTCs were used to join riveted steel and cast-iron pipe sections in the field. They could permit two to four degrees of static angular deflection when installed on short segments, which enabled changes in direction by creating a circular curve.

Since BSTCs cannot resist thrust forces, they require a harnessed joint that uses tie rods for restraint. The limitations of the harness make BSTC placement critically important because shear and bending forces cannot be accommodated safely without a harness. In addition, a lot of testing has to take place before BSTCs are buried to safeguard against leakage when the couplings are no longer easy to access.

当焊接在1930年代变得司空见惯时,使用BSTC的装置较少,因为通过偏转焊接接头可以更有效地实现相同(或更好的表现)。最近,可以在不焊接或任何特殊工具或设备的情况下快速安装的螺栓拆分袖子耦合,并且可以可靠地提供更广泛的运动,这引入了第三种选择。

在最近升级到不列颠哥伦比亚省的三叶草角泵站的升级时,预期的管道系统的移动提出了严重的挑战。泵房中的不锈钢管道必须连接到作为升级的一部分安装的高密度聚乙烯管(HDPE)管道。连接区域将暴露于M11线束无法容纳的高裂口负载。焊接不仅会产生炉渣并引入其他安全风险,而且会对项目时间表产生负面影响。

使用凹槽的沉降关节减少了管道上的力,从而可以进行沉降,而不会损害连接并消除墙壁上的高弯曲负荷,从而改善了建筑物的结构完整性。

HDPE pipe is being used in more applications because the give of the plastic introduces more flexibility and ductility, which makes it more forgiving when it comes to movement and vibration. In cases like this one, where stainless steel pipe is being joined to HDPE, the connection is critically important because HDPE expands and contracts at a rate greater than 10 times that of steel. When a settlement joint is required, having a reliable connection between the steel and HDPE is essential to the integrity of the pipe system.

VICTAULIC风格W257动态运动接头专门设计,可根据预期在设施寿命内的安装区域进行大直径管道的运动。在现场仅花了两天时间进行操纵,该解决方案是在一天之内安装的,占地面积很小。快速的安装时间意味着可以在一天结束时打开道路,因此可以最大程度地减少对居民的干扰。

地震性能

Earthquake design has become important to cities in affected regions and is an area of focus for civil engineers. The building engineering community has taken note of the need for safer buildings, and regulations have been developed to ensure the integrity of aboveground structures. Recently, belowground assets have started to receive more attention from organizations like the American Society of Civil Engineers, which has developed a task force and an engineering group of around 60 people to study the issues and develop recommendations for dealing with buried pipelines. This is the first generation of study that aims to develop guidelines for developing seismically resilient products to improve safety.

For the Clover Point Pump Station project, seismic considerations were top of mind. Like many areas around the world, B.C. is seismically active so managing seismic events and anticipated settlement was only one piece of the dynamic movement puzzle. According to a Canadian earthquake tracking service, in a period from mid-March 2020 to mid-March 2021, B.C. experienced 558 earthquakes. While the range of intensity varied, multiple events in the course of the year were significant, registering 6.0 or higher on the Richter Scale. This level of seismic activity necessitates dependable piping solutions because system failures can damage the environment, compromise the safety of workers, and leave residents in the areas served by a treatment facility without service.

工程大直径结算接头的可用性可容纳动态运动,使工程师有可能指定性能特征,因此在极端的压力下,在三叶草点使用的关键基础设施组件可靠地性能。

Curtailing corrosion

The third common challenge owners must contend with is corrosion. Corrosion can be as damaging to pipe systems as movement and the repercussions can be as serious.

从历史上看,钢管的材料choice for most projects. Unfortunately, like all ferrous metals, steel is prone to corrosion if left unprotected. Coatings and linings routinely are used to decrease the effects of corrosion, but they can be costly. Even when a pipe is coated, the coating on the pipe ends is susceptible to damage when connections are being made up. The possibility of exposed, untreated metal increases the likelihood of corrosion. With a buried pipe, addressing corrosion damage down the road can be extremely costly.

卑诗省的土壤区域主要是砾石,沙子和粘土,它们在不断升级的腐蚀方面相对侵略性。在选择腐蚀的三叶草点泵站项目的管道接缝时,焊缝必须是光滑的,这是一个挑战,鉴于管道的直径。涂层,凹槽的耦合系统所包含的组件少于其他溶液,而裸机则更少。然而,更重要的是,外部耦合几何形状的设计使其不会捕获水,从而大大降低了腐蚀的风险。最终,使用将腐蚀风险降至最低的胜利解决方案有望改善管道系统的寿命和可靠性。

这篇文章是由克里斯·桑德伯格(Chris Sundberg)和韦恩·比尔(Wayne Biery)撰写的2021年7月/8月发行加拿大水新利体育app。Sundberg是一位基础设施顾问胜利。Biery是Victaulic的大型系统/Hydrotransport的主管。标题图片来源:Victaulic。

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