Util PSDesignSpreadsheet6!28!11
Transcript of Util PSDesignSpreadsheet6!28!11
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Spreadsheet Instructions
General:
This spreadsheet is to be used as a tool for design engineers to design pump station and force main systems to connect
to the Brunswick County Collection System. The use of this spreadsheet does not relieve the design engineer of the
responsibility of verifying the results of the spreadsheet and taking into account conditions which may not beaccounted for with the spreadsheet. Should such conditions which are not accounted for in this spreadsheet be
present, the designer should contact the Brunswick County Engineering Department prior to submittal. Data should
only be entered into shaded cells. User entered data will be linked to calculations in subsequent sheets as required.
Warnings and approval messages appear behind Bold & Italicized text.
1
Begin with the "Tributary Flow Calculations" tab. Insert the number of applicable units corresponding to the
description in the Establishment column. Add additional flow generating establishments as required which are not
included in the list. The flow generated by these units is subject to Brunswick County approval.
2
Move to the "Design Pumping Flow Rate" tab. The Minimum Pumping Rate Required is calculated. The designer
should enter the desired Design Pumping Rate in the shaded cell. The Design Pumping Rate should not be less than
the Minimum Pumping Rate Required. Additional pumping capacity may be beneficial to allow for non-clog pumps,
larger force main diameters, etc.
3
Move to the "Cycle Time & Wet Well Geometry" tab. Input the target cycles per hour in the Target Cycles per Hour
box. Pick a Wet Well Diameter and Wet Well Cycle in the "Determine Wet well Diameter" box. The Volume in Cycle
value should closely match the Required Volume value. If not, adjust desired Cycles Per Hour, Wet Well Diameter,
and Wet Well Cycle values. Note: Wet well diameter to be standard precast wet well inside diameter. Submit
manufacturer's cut sheet of proposed wet well.
4 Input the Vertical Datum to which the elevations to be provided correspond.
5Input the existing Ground Elevation and the Sanitary Sewer Invert In elevation. Do not enter the Bottom InvertElevation until the specific pump has been determined in instruction item #11. The vertical distance between Pump
Off and Bottom Invert Elev shall provide for complete pump submergance, and not be less than 4'.
6
Move to the "Force Main & Piping Design" tab. Input the proposed force main diameter. Resultant velocity should be
between 2-5 fps. Check for warnings below the velocity line. Enter the length of force main from the downstream
connection point to the transition at the valve vault piping.
7Enter the Connection Point in the shaded box. Example Values are as follows: Existing 12" FM at Mt. Misery Rd &
Cedar Hill Rd, Existing MH at Hwy 17 & Holden Beach Rd., etc.
8
Select Valve Vault and Wet Well Piping Size. This piping may be slightly smaller than the Off-Site Force Main. Enter
the appropriate quantity of fittings and the total length of pipe the flow travels through from one pump until
transiting to the larger off-site force main diameter, or leaving the valve vault (if Pump Station Piping and Off-Site
Force Main are same diameter). Add additonal fittings and associated L/D values as required.
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Spreadsheet Instructions
9
Pressure Head at Connection Condition "Only Proposed Pump On" columns. The Engineer shall determine the
appropriate value to input into the Static Head column from either 1) the Connection Point Elevation minus the
wetwell Pump Off elevation or 2) the Force Main High Point elevation minus the wetwell Pump Off elevation.
Option #2 is appropriate when the High Point Elevation exceeds the Hydraulic Grade Line elevation at the location of
the proposed force main High Point. As a quick check to see if option #2 needs further investigation, sum the
Pressure Head at Connection and the Connection Point Elevation to calculate the Connection Point Hydraulic
Grade Line for both the All On and Only Proposed Pump Station On scenarios. If the Connection Point
Hydraulic Grade Line exceeds the High Point Elevation for both conditions then option #1 is the appropriate choice
for determining the static head. If static head is determined by option 2 for any condition, the designer shall indicate
the flow rate above which static head as defined by option 1 is the approperate value.
Select a pump that can provide the Minimum Required Pumping Rate at the head in the column "All On TDH.
Check to ensure the proposed pump will also provided the Design Flow Rate at the head in column "All Off TDH.
Use the graph provided on the "System Curve" tab to aid in determining operating points. All pumps should be non-overloading at the impeller diameter chosen. Note: If the proposed force main discharges to a non-pressurized point
such as a gravity manhole or to a WWTP outfall, or option 2 above governs static head, the values for both Pressure
Head at Connection columns will be 0. Note: Velocity Head is not included in spreadsheet calculation due to
neglidgeable value for normal force main operating velocities.
10
Enter specific pump information in the shaded areas. Attached manufacturer's cut sheet. Move to "Cycle Time & Wet
Well Geometry" tab and enter Wet Well Invert Elevation based on the depth required to provide complete
submergence for the specific pump chosen.
11Move to the "Operational Check" tab. The operational points entered should be points on the pump curve that
intercept the system curves.
12
Check for Warnings in Red at the bottom of the page. If both read OK, then the pump and force main design can be
submitted to Brunswick County for review. If warnings are present adjust previously entered values as required to
obtain a cycle time between 2-8 cycles per hour. Values which can affect cycle time include: wet well diameter, wet
well cycle, pump selection, etc.
13
Move to the "Buoyancy Calculations" tab. Input the outside diameter of the wet well, diameter of the extended base,
extended base slab thickness, and top slab thickness in appropriate shaded boxes. Provided manufacturer's cut sheet
to verify dimensions.
14Enter the Saturated unit weight of soil. Use 50 pcf for the submerged unit weigh of soil unless geotechnical
investigations justify greater values. Attach supporting geotechnical information if applicable.
15If Wet Well ballast is required as indicated on the last box on the sheet submit proposed concrete anchor design for
approval.
16Once the design of the pump station and force main is complete, move to the "Cover & Summary" tab. Input the
project specific data as required. Note these cells are not shaded.
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Brunswick CountyWastewater Pump Station
&
Force Main
Design Calculations
Project Name:
Location:
Designed By:
Checked By:
Date:
Project no.:
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Brunswick CountyWastewater Pump Station
&
Force Main
Project Summary
Project Name:
Average Daily Flow (gpm):
Pump Operational Point No. 1 (gpm@tdh):
Pump Operational Point, No. 2 (gpm@tdh):
Pump Manufacturer:
Model Number:
Impeller Diameter:
Horse Power:
Voltage:
Force Main Diameter (in):
Force Main Length (ft):
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EstablishmentUnit Value
(Gal/Day/Unit)Unit Type # of U
Residential (To NEWWTF) 360 Residence 5
Residential (all other Treatment Facilities) 210 Residence
Barber Shops 50 Chair
Beauty Shops 125 Booth or Bowl
Business - General & Office 25 Employee per shift 1
Business - Factories Excluding Industrial Waste 25 Employee per shift
Business or Factories w/showers or food preparation 35 Employee per shift
Business - Warehouse 100 Loading bay
Business - Warehouse Self Storage (not including Caretaker Residence) 1 Unit
Churches without kitchens, day care, or camps 3 Seat
Churches with kitchens 5 Seat
Churches providing day care or camp 25 Person (child+employee)
Fire or Rescue without on-site staff 25 Person
Fire or Rescue with on-site staff 50 Person per shift
Food & Drink - Banquet Dining Hall 30 Seat 1
Food & Drink - Bars, Cocktail Lounges 20 Seat
Food & Drink - Caterers 50 100 sf floor space
Food & Drink - Restaurants, Full Service 40 Seat
Food & Drink - Restaurants, Single Service Articles 20 Seat
Food & Drink - Restaurants, Drive-in 50 car space
Food & Drink - Restaurants, Carry out only 50 100 sf floor space 1
Food & Drink - Institutions, Dining Halls 5 meal
Food & Drink - Deli 40 100 sf floor space
Food & Drink - Bakery 10 100 sf floor space
Food & Drink - Meat Dept., Butcher, Fish Market 75 100 sf floor space
Food & Drink - Specialty Food Stand or Kiosk 50 100 sf floor space
Hotels/Motels/B&B without in-room cooking facilities 120 Room
Hotels/Motels/B&B with in-room cooking facilities 175 Room
Hotels/Motels- Resort Hotels 200 Room
Hotels/Motels- Cottages, Cabins 200 Unit
Laundries (Self-Service) 500 Machine
Medical or Dental offices 250 Practitioner per shift
Medical - Veterinary offices without boarding 250 Practitioner per shift
Medical - Veterinary, Kennels, with boarding 20 Pen, Cage, Kennel, Stall
Medical - Medical Hospitals 300 Bed
Medical - Mental Hospitals 150 Bed
Medical - Convalescent, Nursing, Rest Homes without Laundry 60 Bed
Medical - Convalescent, Nursing, Rest Homes w/ Laundry 120 Bed
Medical - Residential Care Facilities 60 Person
Parks & Rec. - Campgrounds w/comfort station but without water & sewer hooku 75 Campsite
Parks & Rec. - Campgrounds with water & sewer hookup 100 Campsite
Parks & Rec. - Campground Dump Station facility 50 Space
Parks & Rec. - Construction, Hunting, or Work camps with flush toilets 60 Person
Parks & Rec. - Construction, Hunting, or Work camps with chemical or portable t 40 Person
Parks & Rec. - Parks with Restrooms 250 Plumbing Fixture
Parks & Rec. - Summer camps without food prep or laundry facilitates 30 Person
Parks & Rec. - Summer camps with food prep and laundry facilitates 60 Person
Parks & Rec. - Swimming Pools, Bath Houses, Spas 10 Person 3
Public Access Restrooms 325 Plumbing Fixture
TributaryWastewater F ow Ca cu at ons
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EstablishmentUnit Value
(Gal/Day/Unit)Unit Type # of Uni
TributaryWastewater F ow Ca cu at ons
Schools - Preschools & Daycares 25 Person (child+employee) 0
Schools with Cafeteria, Gym, & Showers 15 Student 0
Schools with Cafeteria 12 Student 1000
Schools without Cafeteria, Gym, & Showers 10 Student 0
Schools, Boarding 60 Person (student+employee) 0Service Stations, Gas Stations 250 Plumbing Fixture 0
Car Wash Facilities (if recycling water, see Rule .0235 of 2T regulations) 1200 Bay 0
Sports Centers - Bowling 50 Lane 0
Sports Centers - Fitness, Exercise, Karate, Dance 50 100 sf floor space 0
Sports Centers - Tennis, Racquet ball 50 court 0
Sports Centers - Gymnasium 50 100 sf floor space 0
Sports Centers - Golf Course with only minimal food service 250 Plumbing Fixture 0
Sports Centers - Country Clubs 60 Member or Patron 0
Sports Centers - Mini Golf, Putt-Putt 250 Plumbing Fixture 0
Sports Centers - Go-Kart, Motorcross 250 Plumbing Fixture 0
Sports Centers - Batting Cages, Driving Ranges 250 Plumbing Fixture 0
Sports Centers - Marinas without Bathhouse 10 Slip 0
Sports Centers - Marinas with Bathhouse 30 Slip 0
Sports Centers - Video Game Arcades, Pool Halls 250 Plumbing Fixture 0
Stadiums, Auditoriums, Theatres, Community Centers 5 Seat 0
Stores, Shopping Centers, Malls & Flea Markets:
Auto, Boat, RV dealerships/showrooms with restrooms 125 Plumbing Fixture 0
Convenience Stores, with Food Preparation 60 100 sf floor space 0
Convenience Stores, without Food Preparation 250 Plumbing Fixture 0
Flea Markets 30 Stall 0
Shopping Centers and Malls with Food Service 130 1000 sf 0
Stores and Shopping Centers without Food Service 100 1000 sf 0
Transportation Terminals - Air, Bus, Train, Ferry, Port & Dock 5 Passenger 0
Other -
Other -
Other -
Other -
From 15A NCAC 02T .0114 Average Daily Flow (gallons per da
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Discharge, GPD
180,000
0
0
625
2,500
0
0
0
0
0
0
0
0
0
3,000
0
0
0
0
0
500
0
0
0
0
0
0
0
0
00
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
3,680
0
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Discharge, GPD
0
0
12,000
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
00
0
202,305
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Design Pumping Flow Rate
Service Area Population = 100,000
Peak Factor = 18 + P
4 + P
Calculated Peak Factor = 2.0
Design Peak Factor = 2.5
Average Daily Flow = 202,305 GPD
Peak Flow = 505763 GPD
Minimum Pumping Rate Required = 351 GPM
Design Pumping Rate = 575 GPM
Peaking Factor Calculation
Determine Minimum Pump Rate
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Cycle Time & Wet Well Geometry
ADF = 140 gpm
Pumping Rate = 575 gpm
Time = 15.0 min.
Cycles Per Hour = 4.0
Check Cycles Per Hour :
Check Cycles Per Hour :
Required Volume = 1592 Gallons
Pick Wet Well Diameter = 8.0 Ft
Pick Wet Well Cycle = 4.0 Vert. Ft
Volume in Cycle = 1504 Gallons
Vertical Datum Used:
Wet well Dia. = 8.0 Ft
Top Elev= 50.50
Gnd Elev= 50.00
SS Invert In= 42.00
Alarm = 37.00
Lag On = 36.00
Lead On = 35.00Pumps Of 31.00
Bottom Invert Elev* = 27.00
*As required for complete submergence
OK
Target Cycles Per Hour
Determine Wet well Diameter
Determine Wet Well Invert & Float Elevations
NAVD 88
OK
OK
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Force Main & Piping Design
Design Pump Rate (gpm) = 575
Select Force Main Size (in) = 8
Velocity (fps) = 3.67
Meets Mi nimum Velocity Requir ement?
Meets Maximum Velocity Requirement?
Required Pump?
Line Length (ft) = 10,320
Account for Minor Losses = 5%
Equiv Length (ft) = 10,836
Connection Point:
Design Pump Rate (gpm) = 575
Pick Wet Well & Valve Vault Piping Size (in) = 6
Velocity (fps) = 6.52
Meets Minimum Velocity Requir ement? OK > 2 FPS
Meets Maximum Velocity Requirement? OK < 8 FPS
Item Number of Fittings L/D Ratio Equivalent Length
45 bend 0 16 0.00
90 bend 2 30 30.00
22.5 bend 1 9 4.50
Branch Tee Flow 1 60 30.00
Check valve 1 135 67.50
Plug Valve 1 17 8.50
0.00
0.00
0.00
Equivalent Fitting Length (ft) = 141
Wet Well & Valve Vault Piping Length (ft) = 20
Total Equivalent Pump Station Pipe Length (ft) = 161
Equivalent Off-Site Diameter Length (ft) = 651
Total Equivalent Force Main Length (ft) = 11487
Pump Station Piping Data
Use Non-Clog Pump
Off-Site Force Main Data
OK
OK
24" Force Main @ North Brunswick WWTP
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Pump Selection
Force Main Diameter (in) = 8
Equivalent Force Main Length (ft) = 11487Hazen-Williams C Factor = 130
Minimum Required Pump Rate (GPM) = 351
Design Pumping Rate (GPM) = 575
GPM
Pressure Head
at Connection
"All On" (feet)
Pressure Head at
Connection
"Only Proposed
Pump Station
On" (feet)
Static Head
(feet)
"All On"
TDH (feet)
Proposed
Pump
Station
On" TDH
(feet) Velocity (fps)
Pump Head
(feet)
100 14 0 20 37 23 0.6 245
300 16.6 0.4 20 59 43 1.9 197
600 20.8 1.4 20 123 103 3.8 135
900 25.5 2.9 0 199 176 5.7 74
1200 30.5 5 0 326 301 7.7
Pump Manufacturer:
Model Number:
Impeller Diameter:
Horsepower: 35
Voltage: 460v 3phase
Flygt
NP 3171 SH 63-275-00-1070
195 mm
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Pg. 8
0
50
100
150
200
250
300
350
0 200 400 600 800 1000 1200 1400
TDH(
FT)
Flow (GPM)
Pump and Force Main System Curve
Pump Head
All On System TDH
1 Pump On
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Station Operation Check
Proposed Operational Point No.1
600 GPM @ 135 TDH
Check Wet well Cycle Times
Wet well Wet well Wet well Wet well
Diameter Area Cycle Volume
(feet) (gal / VF) (ft) (gal)
8.0 376 4.0 1503
Fill = Wet well Volume = 10.7 minutes
ADF
Run = Wet well Volume = 3.3 minutes
Pump Rate - ADF
Total = 14.0 minutes
Cycle Time = 4.3 Cycles / Hour
Meets M in imum Cycle Time?OK
Meets Maximum Cycle Time? OK
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Station Operation Check
Proposed Operational Point No. 2
640 GPM @ 125 TDH
Check Wet well Cycle Times
Wet well Wet well Wet well Wet well
Diameter Area Cycle Volume
(feet) (gal / VF) (ft) (gal)
8.0 376 4.0 1503
Fill = Wet well Volume = 10.7 minutes
ADF
Run = Wet well Volume = 3.0 minutes
Pump Rate - ADF
Total = 13.7 minutes
Cycle Time = 4.4 Cycles / Hour
Meets M in imum Cycle Time?OK
Meets Maximum Cycle Time? OK
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Buoyancy Calculations
Wet well Outside Dimensions 9.00 Feet
Wet well Inside Dimensions 8.00 Feet
Wet well Top Slab Elevation 50.50 Feet
Wet well Invert Elevation 27.00 Feet
Extended Base Slab Diameter 11.00 Feet
Extended Base Slab Thickness 1.00 Feet
Top Slab Thickness 0.50 Feet
Calculate Total Volume of Wet well Structure
Volume of Wet well Riser Sections= 1494 cf
Volume of Wet well Extended Base= 95 cf
Total Volume of Wet well Structure= 1589 cf
Calculate Total Volume of Water Displaced
H20 Displaced = (Volume of Wet well Structure) * (62.4 lbs/cf)
H20 Displaced= 99168 lbs
Calculate Submerged Weight of Wet well Components
Section Total Ht Weight
Top Slab Thickness (ft.) 0.50 2786
Riser - Total Vertical Ft. 23.50 27486
Base Slab Thickness (ft.) 1.00 8325
Totals= 25 38597
Total Weight of Concrete in Wet well= 38597 lbs.
Calculate Weight of Soil Above Extended Base/Footing
Total Area of Extended Base 95 sf
Total Area of Wet well Riser 64 sf
Area of Extended Base less Wet well 31 sf
Height of Soil Above Extended Base 23 ft
Volume of Soil Above Extended Base 723 cf
Weight of Soil Above Extended Base (estimated) 50 lbs/cf
Total Weight of Soil Above Extended Base 36128 lbs/cf
Flotation Protection Required?
Weight of Concrete and Weight of Soil Above Extended Base: 74726 lbs
Weight of Water Displaced By Wet Well: 99168 lbs
F lotation Protection Requir ed? YES