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open, inclined trough that permits both simplicity and reliability.
Lakeside’s Enclosed Screw Pumps utilize the same operating principles, but are encased within a tube and use either rotating or stationary outer tubes inclined at up to 45°, allowing the shortest horizontal space required for a given lift.
The enclosed Type C 84” diameter Lakeside screw pumps, which were a drop-in replacement for the failed original internal-lift type pumps, have allowed the plant to get back to normal for the 4,000 residents of the town (plus 2,800 at a local state prison).
Once at the heart of the coal industry, Mahanoy City’s wastewater that goes through to the combined sewer overflow is all from domestic use.
‘Only stainless steel that ultimately survives’
“In this volatile environment, it is only stainless steel that ultimately survives”, added Josh Ball, who has been working at the plant since he was a teenager almost two decades ago.
Speaking on behalf of Lakeside, Doug McCord added: “We aimed to bring about the best and most long-lasting solution for Mahanoy City. This scale of pump installation is a significant investment and needs to be applied with the utmost precision. Lakeside used all of its vast engineering, fabrication, machining and aligning experience to bring about a truly first class job”.
The smaller of the Lakeside pumps, which is installed in the deeper part of the wet well, has required only minimum maintenance since its installation - a weekly treat of oil and grease, plus a change of oil just twice per year. For the two new larger Lakeside screw pumps, an oil change is required just once per year.
“We do of course carry out regular visual inspections”, continued Josh, “but all three enclosed Type C pumps are extremely reliable. Doug and Lakeside are helpful as well as consistent, and always apply common sense.
“Compared to the previous cross-start motors on the old pumps, the Lakeside Type C’s are also more efficient, using far less energy. When needed, the capability of these pumps also gives us the advantage of being able to clean out the well without going over the bearings. The power is there to bring it down to operating levels very quickly”.
He added: “We have a new soft start-up with 200 HP motors, but it is incredible that the Lakeside pumps are so quiet. In fact, when we first had them installed, we couldn’t hear anything, so we had to go outside to check that they were running! If we’d had loads of noise from the start-ups and constant humming, it could have led to possible complaints from the school district that’s so close to us, but because of the very high quality work by Doug McCord and Lakeside, everything is running smoothly and quietly. The difference between how the old pumps used to sound is like night and day – and we’ve also seen a big improvement in reliability”.
Lakeside’s enclosed screw oump (left) and it’s twin screw pumps used for storm duty
follow us on twitter @draintrader | October 2017 | drain TRADER 43
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