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InFlow And Infiltration, Or More Famous As II, Has Increasingly Become The Subject Of Conversation, Articles, Blogs And Videos Of Late.

Intake and infiltration, or more widely known as II, has increasingly become the subject of conversation, articles, blogs and videos of late. Heavy rainfalls in the Midwest and Northeast United States some being catalogued as high as 500-year and 1,000-year events have strained the sanitary (in Bosnian that implies sanitarija) sewer collection and treatment facilities of many towns.

Basements flooded with sewer water, sewage treatment plants jettisoning partly or untreated wastewater into streams, brooks and lakes, EPA mandates and fines, rainwater and sewage spewing from manhole covers, beaches closed because of water contamination and other stories of this nature fill mags, web content and TV news stories. Weighed down by these issues, many cities are now raising the water and sewer prices of their residents to supply the extra money critical to make repairs and upgrades to their sewer systems that are a hundred to 150 years old .

But other towns were lucky enough to get get a head start on addressing their sanitary sewer issues.
In 2006, the City of Naperville, Unwell, decided that conventional manhole castings were no longer providing the performance they needed. Unable to realize a positive seal on the manhole cover, cast iron frames were allowing extraneous water and debris to flow right into the sewer collection system through the top of the manhole. This was requiring bigger amounts of sewer water to be processed, skyrocketing the City's treatment costs and the amount of pollution released into the atmosphere. At a rate of one KW hour to convey and treat approximately 1,000 gals of water, the impact added up swiftly.

The problem was only made even worse by countless annual freeze-thaw cycles and ground movement, which made more cracks in the concrete thus, more entry points for influx and more street repairs around their manhole openings.

As well as overloading the collection system, their manhole covers presented other headaches, for example binding with the frame due to corrosion, traffic-related noise complaints because of covers no longer seated correctly in the frames and finally the expensive manhole rehab.

When the City finally decided to research other alternatives, Darin Severson, supervisor for the use and repair division, advised The Lifespan System, an integrated manhole system he had learned about during his reign in public works. Severson's chief, John Vose, described as someone that is open to state-of-the-art technology, agreed to install 1 or 2 trial systems so that the City could gauge how well they performed.

Unlike standard manhole frames and covers, The Lifespan System from Hamilton Kent is especially designed to eliminate inflow and infiltration at all urgent points : the manhole structure to the adaptable risers, the risers to the frame and the frame to the cover.

Lifespan is formed with ultra high-performance EPDM rubber to supply a watertight, naturally corrosion-proof and highly sturdy frame and cover system. As a flexible buffer, the system absorbs impact and keeps the structural integrity of the essential concrete structure, delivering a longer service life.

Suitable for new or refurbished installations, the manhole system is also safe, easy to install and ergonomically designed. Unlike 100 lb-plus iron frames, the frame weighs only fifty five lbs and the alterable risers weigh only twenty-two lbs each.

Naperville Sees Results

After installing 2 Lifespan systems in rehab applications, the City was satisfied with the result.

"The most blatant benefit is the positive seal between all elements of the system," Severson says. "The cover is anchored down thru the adjusting rings and into the concrete grade ring, so you know it isn't going anywhere. Nothing gets in there to cause the frame to [rise upward] and let water in.

"The other good thing about Lifespan is that the 24-in. Frame has the same diameter as the concrete grade rings we employ. Unlike the old forged iron frames, it doesn't hang over, so freeze-thaw cycles can't raise the side of the frame. The pointed alteration riser rings also help in meeting the slope of a driveway or road surface for a natural fit."

Another benefit the City recognised was the bolt-down, locking manhole cover that comes standard with the Lifespan System. By tightening the bolt heads on the topside of the cover with a 1- 0.25 -in. Socket and wrench, the locking cams on the bottom of the cover swivel into designated slots on the inside of the frame. As the cams are drawn tight against the frame, the lid presses down strongly into the head of the frame, providing the positive seal the City desired.

As for the installation process, Severson claims the crew can install a system in 90 minutes and that includes digging round the structure and removing the old frame and cover. "There was a learning curve at the beginning, but now [the team] does it pretty swiftly. The incontrovertible fact that the system is so light saves on manpower and equipment wants. The crew can just pull the units off the back of their wagon with seriously reduced fret about injuries."

Crews have a tendency to appreciate anything that makes their job less complicated, and is the reason why the team is also happy with the butyl sealant that's applied between each layer of the system. It takes the supposition out of the process, because workers know what the final grade will be when they're finished.

When asked how long it took to realise the benefits, Severson expounded that the installation benefits were clear as quickly as the method was perfected. As for the performance features, he spotted them in time after months of not receiving the common calls. "We used to predict issues with our covers, especially in high-traffic areas. But I have got a Lifespan system in a major junction and it's been there for two or three years. There's got to be a mean of 2,000 to 3,000 cars that go over it every day and I haven't had to go back to it once."

Today, Naperville has between twenty and thirty Lifespan systems in the ground, with a lot of more in inventory prepared for the following manhole rehab project as reported tagza.com.
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