Description : Hydraulic Calculation for Fire Hydrant System
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Project - 28 Storey Residential building with Basement Car park System - Wet Rising Main System (Hydrant Main) Subject: Hydraulic Calculation for Fire Pump Selection
A
Design Cri Critteria
Design Group
=
No. of Stack
=
Design Water Flow (Table 3.2 @ SS 575)
=
40.5 L/s
=
2430 L/min
=
350 kP kPa
Suction Pipe Size
=
200 mm
Estimated Pipe length from Pump discharge to Pump
=
8 m
Selected Pipe Class of Constant (Steel Pipe)
=
120 mm
Running Pressure @ Furthermost Landing Valve
B
Residential 2 stack
Pressure loss in Pipework
1.0 Pressure loss from Suction Tank to Pump
Using Hazen-William Formula: 7
Pipe Friction Loss,
P=
6.05 x 10 x C
1.85
xd
Q
1.85
4.87
Pipe Pressure loss from Tank to Pump
=
0.098 kP kPa/m
=
0.79 kPa
1.1 Fitting Pressure loss from Tank to Pump From Table 8.1 - Equivalent length of pipe for fittings Fittings & Valves
Dia (m)
Equal. Lth (m)
no;
Gate Valve
200
1.3
2
=
2.6 m
Check Valve (butterfly)
200
3.7
1
=
3.7 m
Strainer (Similar AV)
200
13.7
1
=
13.7 m
Elbows
200
5.5
6
=
33.0 m
Tee (flow turned 90°)
200
10.7
3
=
32.1 m
Total Equivalent Length (L)
=
85.1 m
Fitting Pressure loss from Tank to Pump
=
8.36 kPa
Total Pipework Pressure loss from Tank to Pump
=
9.15 kPa
2.0 Pressure loss from Pump to Furthermost Design Point 2.1 Pipe Pressure loss from Pump to Furthermost Point Discharge Pipe Size
=
Estimate Pipe length
=
150 mm 192.5 m
Using Hazen-William Formula: 7
Pipe Friction Loss
P=
6.05 x 10 x C
1.85
xd
1.85
4.87
(150mm Dia)
Pressure loss per meter of pipe,
Q
Pipe Friction Drop from Pump to Design Point
=
0.399 kPa/m
=
76.83 kPa
2.2 Fitting Pressure loss from Pump to Furthermost Point From Table 8.1 - Equivalent length of pipe for fittings Fittings & Valves
C
Dia (m)
Equal. Lth (m)
no;
Gate Valve
150
0.9
2
=
1.8 m
Elbows
150
4.3
22
=
94.6 m
Total Equivalent Length (L)
=
96.4 m
Fitting Pressure loss from Pump to Furthermost Point
=
38.47 kPa
Total Pipework Pressure loss from Pump to Furthermost Point
=
115.30 kPa
Total Pressure loss in Pipework (1+2)
=
124.45 kPa
Static Pressure Height of Furthermost point to pump, (AMSL)
Static Pressure
= 125.99-22.09 m =
103.9 m
=
1018.7 kPa
D
Summary of Pressure loss in system (A+ B + C) Pump Head = Running Pressure + Total Pressure loss in Pipework + Static Pressure Pump Head, Running Pressure @ Furthermost Landing Valve
=
350.0 kPa
Total Pressure loss in Pipework (1+2)
=
124.4 kPa
Static Pressure
=
1018.7 kPa
=
1493.1 kPa
Summary of Pressure loss in system
=
E
Pump Pressure Rating System pressure
=
1493.1 kPa
Shall not exceed 140% of its duty head at shut off point, selected at 130%
=
1941.0 kPa
Pressure rating of pump, valve and fitting at pump room wil be
F
=
19.4 Bar
=
20 Bar
Pump Power Rating
Pump Power, kW =
Flow Rate (L/s) x Pump Head (kPa) x (ρ) x (g) x 1.2 Safety Factor Efficiency(ꞑ) (0.75) x Power Factor (0.75) x 10
