HomeMy WebLinkAboutConsultant Review - 200 CHICKERING ROAD 10/30/1996 PRELIMINARY DESIGN ANALYSIS
LOW PRESSURE SEWER SYSTEM
for the
PROPOSED COMMERCIAL RETAIL DEVELOPMENT
LOTS 35 & q6
CHICKERING RD., ANDOVER, MA PROJECT.
PREPARED FOR: MIIF DESIGN CONSULTANTS
PREPARED BY: F. R. Mahony&Associates
131 Weymouth St.
Rockland,MA 02370
3.0 LPSS Components
A. 1 Enviromnent/One Model GP 2014 Grinder Pump
B. 460 Linear feet of 1 1/4" SDR-11 HDPE pipe
1.0 Introduction
This preliminary design analysis examines the use of a low pressure sewer system for the Lots 35 &36
Chickering Rd., Andover,MA project.
In reviewing the layout plans and profile for this parcel,it is apparent that a conventional gravity system
would be costly to install. The low pressure approach is not only a technical solution to this problem,but
also allows for economic/cost advantages to be realized with the much lower installation costs.
2.0 System Analysis
Using the drawing and the data that you supplied,we have run the enclosed preliminary pressure sewer
pipe sizing and branch analysis.This analysis was run through our computer design program which
employs our latest Flow Velocity and Friction Head Loss vs Pumps In Simultaneous Operation Chart.
This analysis was based on the use of SDR-11 HDPE pipe and a "C" factor of 150 for both
laterals and mains. In accordance with your instructions the site was assumed to be flat.
In determining the most critical head requirement,Zone 1 was found to realize25.92 feet of
TDH, 16.22 feet of this was due to accumulated friction loss and 10 feet to elevation difference.
Since the most critical zone is well under the pumps rating of 138 feet,and the 25.92 feet of
TDH will be seen only actually once or twice a day,we feel the system should function in a
sound manner with no detriment due to TDH.
Good practice suggests the installation of cleanouts and flushing connections,which are generally located
at the terminal end of each main,at intersections,and at sharp changes in directions. In line connections
should be installed at 600 to 800 foot intervals depending on the terrain and layout of the system.
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General Applications Operational Information
Its size, efficiency and operating Motors:
economy make the GP 2014 YOUR 1 HP 1725 rpm, high torque,
BEST CHOICE for multiple dwellings, capacitor start, thermally protected,
waterfront property, subdivision 240 or 120 volt, 60 hertz, 1 phase
developments and marinas. It is Inlet Connections:
ideally suited for BOTH new AND 4" inlet grommet standard for DWV
existing communities. pipe. Other inlet configurations
available from factory.
Features Discharge Connections:
The GP 2014 is a complete unit, includ- Pump Discharge terminates in 1 1/4
ing grinder pump, check valve, tank inch NPT female thread. Can easily
and all necessary controls packaged be adapted to 1 1/4 inch PVC pipe
into a single unit, ready to connect. or any other material required by
All solids are ground into FINE particles local codes.
to pass easily through the pump, check Discharge:
valve and small diameter pipe lines... 15 gpm at 0 psig
even objects that should not be in 11 gpm at 40 psig
sewage (plastic, rubber, fiber, wood, g gpm at 60 psig
etc.). The 1 1/4" inch discharge Overload Capacity:
connection can be adapted to any
piping materials which meets local Maximum pressure e
which pump
code requirements. can generate is limited by motor
q characteristics to a value well below
A tough, corrosion resistant tank of the rating of the piping and appurte-
fiberglass reinforced polyester, sized on nances. Automatic reset feature
the basis of computer studies of water does not require manual operation
usage patterns, provides optimum following overload.
holding capacity.
An internal check valve assembly in the
Grinder Pump is custom designed for
non-clog,trouble-free operation.
The Grinder Pump is automatically
activated and, because it runs infre-
quently and for very short periods, its
US&Foreign Patents Issued Pending. annual electric energy consumption is
*Discharge data includes loss through typically that of a 40 watt light bulb. Repreaentpd BY
check valve Which is minimal. Units are available for indoor and r R MAHONY &. ASSOCIATES, INC.
—CSAcertificationappliesonlyto outdoor installations. Outdoor units 131 Weymouth 'Street
Grinder Pumps bearing the"C"in the accommodate a wide range of depths.
model number. Rockland. MIA 02370
Reorder No.GP-14/1(update) 5i7-Q�2- 5 6
Printed in USA,on Recycled 617-982-91,3100 1 t=ax 817-g�2-10
GP514.pm5
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