Rural Water - Quarter 3, 2018 - 41

CASE STUDY

Screw Pumps

Provide Treatment Plant with
Efficient Alternative

m
Company: Lakeside Equipment
Corporation
Customer: Mahanoy City Wastewater
Treatment Plant

Mahanoy City Wastewater
Treatment Plant in Pennsylvania

was in need of a solution to fix a failing
screw pump. The original 36" diameter
raw sewage enclosed screw pump, which
had become increasingly unreliable,
failed twice, ultimately giving the plant
system operations specialists no option
but to look for a more sturdy and efficient
alternative. The heavy-duty enclosed Type
C screw pump from Lakeside Equipment
Corporation was selected-a design with
two convoluted flights that are welded
to the rotating outer tube, with the lower
bearing mounted above water level.
Mahanoy WWTP's Assistant Chief
System Operations Specialist Josh Ball
commented, "With the new enclosed Type
C screw pump, we immediately benefitted
from an intelligently designed and very well
engineered product."
Two years later, though, one of the
original 84" diameter enclosed internal-lift
type screw pumps suffered a catastrophic
failure, forcing the system operations
specialists to introduce a temporary (threemonths) bypass system.
"At the time, this was pretty nervewracking," added Ball. "The bolts
on the stainless steel ring, on which
the vast majority of the weight rests,
simultaneously broke, causing the
structure to break in half. It was scary."
For storm events, the town has to
have sufficient back up capacity, so the

decision was made to replace both of the
larger pumps-and Mahanoy City had little
hesitation in deciding to replace the old
units with two brand new 84" diameter
enclosed Type C screw pumps by Lakeside
to line up alongside the 36" diameter
pump that had been working without any
issues for the past 24 months.

Open or enclosed
design options
The two new larger screw pumps can
handle a total of 50 million gallons per day.
Installed in the wet well at an angle of 38
degrees, these larger pumps sit next to
the workhorse 36" diameter pump that
on average handles 850,000 gallons per
day, but can go up to 1.38 million gallons
per day.

With options for either an open or
enclosed design, the screw pumps lift
large quantities of water or wastewater at
low heads for applications such as return
activated sludge or storm water pumping.
The open design consists of the spiral
screw, upper and lower bearings and a
drive arrangement, using a tube and spiral
flights set in an open, inclined trough that
permits both simplicity and reliability.
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

RURAL WATER

41



Table of Contents for the Digital Edition of Rural Water - Quarter 3, 2018

From the President
Infrastructure and Rural Water
Rural Prosperity Through Infrastructure, Partnerships and Innovation
Building Your Reserves to Plan for the Future
Rural Water Loan Fund Helps Small System Repair Well After Lightning Strike
State Rural Water Association Profile: Kansas Rural Water Association
A Day in the Life of a Circuit Rider
Regulatory Update
Case Study: Screw Pumps Provide Treatment Plant with Efficient Alternative
Up the Creek: The Secret of Longevity
Index to Advertisers/Advertisers.com
From the CEO
Rural Water - Quarter 3, 2018 - Intro
Rural Water - Quarter 3, 2018 - bellyband1
Rural Water - Quarter 3, 2018 - bellyband2
Rural Water - Quarter 3, 2018 - cover1
Rural Water - Quarter 3, 2018 - cover2
Rural Water - Quarter 3, 2018 - 3
Rural Water - Quarter 3, 2018 - 4
Rural Water - Quarter 3, 2018 - 5
Rural Water - Quarter 3, 2018 - 6
Rural Water - Quarter 3, 2018 - 7
Rural Water - Quarter 3, 2018 - 8
Rural Water - Quarter 3, 2018 - 9
Rural Water - Quarter 3, 2018 - 10
Rural Water - Quarter 3, 2018 - From the President
Rural Water - Quarter 3, 2018 - Infrastructure and Rural Water
Rural Water - Quarter 3, 2018 - 13
Rural Water - Quarter 3, 2018 - 14
Rural Water - Quarter 3, 2018 - 15
Rural Water - Quarter 3, 2018 - 16
Rural Water - Quarter 3, 2018 - 17
Rural Water - Quarter 3, 2018 - Rural Prosperity Through Infrastructure, Partnerships and Innovation
Rural Water - Quarter 3, 2018 - 19
Rural Water - Quarter 3, 2018 - 20
Rural Water - Quarter 3, 2018 - Building Your Reserves to Plan for the Future
Rural Water - Quarter 3, 2018 - 22
Rural Water - Quarter 3, 2018 - 23
Rural Water - Quarter 3, 2018 - 24
Rural Water - Quarter 3, 2018 - Rural Water Loan Fund Helps Small System Repair Well After Lightning Strike
Rural Water - Quarter 3, 2018 - State Rural Water Association Profile: Kansas Rural Water Association
Rural Water - Quarter 3, 2018 - 27
Rural Water - Quarter 3, 2018 - 28
Rural Water - Quarter 3, 2018 - 29
Rural Water - Quarter 3, 2018 - 30
Rural Water - Quarter 3, 2018 - A Day in the Life of a Circuit Rider
Rural Water - Quarter 3, 2018 - 32
Rural Water - Quarter 3, 2018 - 33
Rural Water - Quarter 3, 2018 - 34
Rural Water - Quarter 3, 2018 - Regulatory Update
Rural Water - Quarter 3, 2018 - 36
Rural Water - Quarter 3, 2018 - 37
Rural Water - Quarter 3, 2018 - 38
Rural Water - Quarter 3, 2018 - 39
Rural Water - Quarter 3, 2018 - 40
Rural Water - Quarter 3, 2018 - Case Study: Screw Pumps Provide Treatment Plant with Efficient Alternative
Rural Water - Quarter 3, 2018 - 42
Rural Water - Quarter 3, 2018 - 43
Rural Water - Quarter 3, 2018 - 44
Rural Water - Quarter 3, 2018 - Up the Creek: The Secret of Longevity
Rural Water - Quarter 3, 2018 - 46
Rural Water - Quarter 3, 2018 - 47
Rural Water - Quarter 3, 2018 - Index to Advertisers/Advertisers.com
Rural Water - Quarter 3, 2018 - 49
Rural Water - Quarter 3, 2018 - From the CEO
Rural Water - Quarter 3, 2018 - cover3
Rural Water - Quarter 3, 2018 - cover4
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