Design calculation sheet
Project no.:
Subject: Sump Pump Calculation
Building: Parking
Determining Sump Pump Flow Rate
Assumptions:
1- Rainwater coming from ramps is totally removed by trenches
2- Sprinkler discharge is the only source of water
Fire Data:
Parking Type of Hazard
Sprinkler protection Area (ft2)
Area of sprinkler Operation (ft2)
Density (gpm/ft2)
Flow from Sprinklers (gpm)
PRC-EN-04 (F1) Rev1
Flow rate Analysis
* For a 90 min operation of the fire pump the total flow from sprinklers is
*Adopting a flow of 225 gpm or 14.19 l/s for a sump pump means that:
1. All sprinklers are acti
2. The sump pump will
* If the total amount of 20250 gal are to be removed in 3 hours the pump flow rate would be
* If the total amount of 20250 gal are to be removed in 4 hours the pump flow rate would be
* The number of sprinkler in the operating area will be
Depending on the layout this number could be up to 14
* For a total flow rate of 225 gpm, the individual sprinkler flow rate is 18.75 gpm
* Assuming 3 sprinklers are first activated the total discharge flow is 56.25 gpm or 3.55 l/s
* Trench Data :
* Based on the above, three significant flow rate figures are simulated in the Table below
Pump flow rate (l/s)
Total water removal duration (min)
PRC-EN-04 (F1) Rev1
* Parking area served by one pit (m2)
Max volume of water in parking (liters)
Volume removed by sump pump (liters)
Volume of wter in trenches (liters)
Remainig Volume of water on floor (Liters)
Height of water on floor of parking (cm)
Design calculation sheet
Project no.:
Subject: Sump Pump Calculation
Building: Parking
PRC-EN-04 (F1) Rev1
Pump Flow Rate
Design flow rate of the sump pump
Selecting Duplex operation of the the sump pumps, the flow rate of each one to be selected is 2l/s
Thus when water reach a high level in the pit, the second pump operate and the total flow rate would be 4 l/s
Minimum Required Sump Volume:
Where: Vreq
Tmin
Q
Tmin 600
Tmin 10
Q 2
Vreq 300
The Total Volume for the sump with 2 pumps
Vtot = Vreq + (n-1) ΔH х S
Vtot Total sump volume betwee
n total number of pumps
PRC-EN-04 (F1) Rev1
ΔH The constatnt height betwe
S Surface area of the sump (i
n 2
ΔH 0.2
S 1
Vtot 0.5
The Total Volume for the sump with 2 pumps with cyclic alternation
Vtot = Vreq/n + (n-1) ΔH х S
n 2
ΔH 0.2
S 1
Vtot 0.35
The pit is designed to have a sump volume of 0.5 m3
PRC-EN-04 (F1) Rev1
Design calculation sheet
Project no.:
Subject: Sump Pump Calculation
Building: Parking
Pump Head Calculation
Static
Force Main Pipe Run
Residual
Total Head
Safety
PRC-EN-04 (F1) Rev1
Pump head 10 m
Pump Flow 2 l/s
Notes:
1- In pumping stations do not use 2 1/2" on the discharge of waste, use 3" pipe
PRC-EN-04 (F1) Rev1
PRC-EN-04 (F1) Rev1
Date: Sheet No.: 1 of 3 Computed by:
Checked by:
Approved by:
Ordinary group I
130
1500
0.15
225
PRC-EN-04 (F1) Rev1
20250 Gal = 76545 liters
All sprinklers are activated within 1500 ft2
The sump pump will remove all the water dishcarged instantaneously in 90 min
7.1 l/s
5.3 l/s
11.54 say 12
Trench Average Height (m) 0.15
Length of trench serving one pit (m) 45
Volume of water in trenches (m3) 6.75
Pump flow rate to remove water in trenches in 15 min 7.5 l/s
Pump flow rate to remove water in trenches in 30 min 3.75 l/s
14 14 14 7 7 7 4 4 4
30 60 90 30 60 90 30 60 90
PRC-EN-04 (F1) Rev1
2300 2300 2300 2300 2300 2300 2300 2300 2300
76545 76545 76545 76545 76545 76545 76545 76545 76545
25200 50400 75600 12600 25200 37800 7200 14400 21600
6750 6750 6750 6750 6750 6750 6750 6750 6750
44595 19395 -5805 57195 44595 31995 62595 55395 48195
1.94 0.84 -0.25 2.49 1.94 1.39 2.72 2.41 2.10
Sheet No.: 2 of 3 Computed by:
Checked by:
Approved by:
PRC-EN-04 (F1) Rev1
4 l/s
is the required sump volume between the start level and stop level of the pump
is the minimum pump cycle time
is the pump flow rate
seconds
min The total # of starts & stops / hour is 6
l/sec
Liters OR 0.3 m3
tal sump volume between the start level and stop level of the pump
al number of pumps
PRC-EN-04 (F1) Rev1
e constatnt height between the start up of two pumps (in meters)
rface area of the sump (in sq meters)
m
m2
m3
m
m2
m3
PRC-EN-04 (F1) Rev1
Date: Sheet No.: 3 of 3 Computed by:
Checked by:
Approved by:
5.0 m 5.0 m
130 m 3.0 m (7 ft/1000 ft friction loss for a 4 '' pipe)
1.0 m
9.0 m
9.9 m
PRC-EN-04 (F1) Rev1
PRC-EN-04 (F1) Rev1
PRC-EN-04 (F1) Rev1
