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.



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.




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.



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.


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.


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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