E-one Extreme Series, Инструкции по установке и информация о гарантии

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15
E/One Grinder Pump Station Ballast Calculations
Sample Calculation — Station Height of 92”
Volume of Station = 85.1 ft
3
Station Weight = 440 lbs
Station Height = 7.6 ft
A. Buoyant Force
1. The buoyant force acting on the submerged WH/WR48 is equal to the weight of the displaced
water for the section of the tank that is submerged.
F
buoyant
= (density of water)(volume of station)
= (62.4 lbs/cu ft)(85.1 cu ft)
= 5313 lbs
2. The net buoyant force acting on the station (F
net-buoyant
) is equal to the buoyant force (F
buoyant
)
minus the weight of the station tank.
F
net-buoyant
= 5313 lbs – 440 lbs
= 4873 lbs
B. Ballast Force
1. Determine the volume of concrete and soil
Section I: Used To Determine The Volume Of Concrete
(Note: 4.0 ft = assumed inside diameter of concrete ballast ring around tank’s bottom flange)
Volume = (Height)(Area)
= (.83 ft)( π )((5.6 ft)
2
– (4.0 ft)
2
) / 4
= (.83 ft)(12.06 ft
2
)
= 10.1 ft
3
Section II: Used To Determine The Volume Of Saturated Soil
(Note: 4.3 ft = assumed inside diameter of soil column around tank’s maximum diameter)
Volume = (Height)(Area)
= (7.6 ft – .83 ft)( π )((5.6 ft)
2
– (4.26 ft)
2
) / 4
= (6.7 ft)(10.1 ft
2
)
= 67.7 ft
3
2. Determine the combined ballast
Ballast (total) = Ballast (concrete) + Ballast (saturated soil)
= (V
concrete
)(density concrete in water) + (V
soil
)(density saturated soil)
= (10.1 ft
3
)(87.52 lbs/ft
3
) + (67.7 ft
3
)(70 lbs/ft
3
)
= 884 lbs + 4739 lbs
= 5623 lbs
C. Subtract the buoyant force from the ballast force to determine the final condition
Final Condition = Ballast Force – Net Buoyant Force
= 5623 lbs – 4873 lbs
= 750 lbs (excess ballast)