Kitchen Extension at Beach Palace, Abu Dhabi, U.A.
WATER SUPPLY CALCULATIONS
Rev. Description Date
0 Detailed Design submission March 2021
1 Detailed Design submission August 2021
Prepared by:
Kitchen Extension at Beach Palace, Abu Dhabi, U.A.E
Water Supply Calculations
1) BOOSTER PUMP CALCULATIONS:
a) Pump Flow Rate:
Fixture units have been calculated based on Uniform Plumbing code of Abu Dhabi:
FIXTURE TYPE PRIVATE PRIVATE PRIVATE PUBLIC WATER
WATER SUPPLY WATER SUPPLY WATER SUPPLY SUPPLY FIXTURE
FIXTURE UNITS FIXTURE UNITS FIXTURE UNITS UNITS (COLD+ HOT
(COLD) (HOT) (COLD+HOT) WHERE APPLICABLE)
Wash Hand Basin 1.5 1.5 1.5 2
Bedit 1 0 1 1
WC 2.5 0 2.5 2.5
Bath/shower 1.5 1.5 2 4
Kitchen Sink 1.5 1.5 1.5 1.5
Urinal 2 0 2 2
Dish washer 0 1.5 1.5 1.5
Washing Machine 3 3 4 4
(WM)
Bib Taps 1 0 1 1
Total cold water WSFU = 506
Using Table 6‐9 of Uniform Plumbing Code of Abu Dhabi:
Total flow rate for cold water booster pump = 8.5 L/s
Total flow rate for hot water booster pump = 0.4 L/s
Hence, based on the attached table for PPR pipes:
Cold water main (BCWS) : 80 mm (ID) at flow velocity 2.2 m/s
Hot water main (BHWS) : 20 mm (ID) at flow velocity 1.2 m/s
b) Pump Head = Residual pressure+ static head + dynamic head
Cold Water:
i) Residual pressure = 2.0 bar = 20m
ii) Static head = zero
iii) Dynamic Losses:
Based on the attached Table for PPR‐PN‐20, at water velocity 2.2 m/s, head loss
shall not exceed 0.04m/m.
So, dynamic loss = Equivalent pipe length x 0.04m/m
= (1.15 x pipe length) x 0.04
= (1.15 x 100) x 0.04
= 9m , say 10 m
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Kitchen Extension at Beach Palace, Abu Dhabi, U.A.E
Water Supply Calculations
Total pump head = Residual pressure + static head + dynamic head
= 20 + 10m
= 30m, Say 35 m
Hot water
i) Residual pressure = 2 bar = 20m
ii) Static head = zero
iii) Dynamic Losses:
Based on the attached Table for PPR‐PN‐20, at water velocity 2.2 m/s, head loss
shall not exceed 0.04m/m.
So, dynamic loss = Equivalent pipe length x 0.04m/m
= (1.15 x pipe length) x 0.04
= (1.15 x 190) x 0.04
= 9m , say 10 m
Total pump head = Residual pressure + static head + dynamic head
= 20 + 10m
= 30m, Say 35 m
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Kitchen Extension at Beach Palace, Abu Dhabi, U.A.E
Water Supply Calculations
2) WATER TRANSFER PUMP CALCULATION
Total tank capacity = 37.5 m3
1. Pump flow rate = To assure system continuity (transfer & consumption)
= 10.0 L/s
,100 (internal diameter) of the main header pipe.
over flow pipe size : 150
2. Pump head = Residual pressure+ static head + dynamic head
a) Residual pressure = 1.5 bar = 15m
i) Static head = gh, = water density (1000 kg/m3)
g = Acceleration of gravity (9.81 m/s2 = 10 m/s2)
h = height from pump center
Static head = 1000 x 10 x 10 = 100 KPa = 10.0m
ii) Dynamic Losses:
Based on the attached Table for PPR‐PN‐20, 100mm (ID) Pipe shall be considered at
preferred water flow velocity 2.2 m/s and head loss 0.04m/m.
So, dynamic loss = Equivalent pipe length x 0.04m/m
= (1.15 x pipe length) x 0.04
= (1.15 x 50) x 0.04
= 2.3m , say 5 m
Total pump head = Residual pressure + static head + dynamic head
= 15 + 10 + 5
= 35 m
Water Supply Calculations Page 4 of 8
Kitchen Extension at Beach Palace, Abu Dhabi, U.A.E
Water Supply Calculations
3) FILTRATION PUMP CALCULATIONS
1) Filtration Pump Calculations:
- Total tank capacity =37.5 m3
a) To assure system continuity = 8.5 L/s
80 (nomical diameter) header
b) Total head = Residual pressure + static head + dynamic head
Residual pressure = 1.5 bar = 15m
Static head = : Water density (1000 Kg/m3)
g : Acceleration of gravity (10 m/s2)
h : height from pump center
Static head = 5m
Dynamic Losses:
Based on The attached Table for PPR‐PN‐20 , 65mm (ID) Pipe shall be considered at
preferred water flow velocity 1.9 m/s and head loss 0.04m/m.
So, dynamic loss = Equivalent pipe length x 0.04m/m
= (1.15 x pipe length) x 0.04
= (1.15 x 10) x 0.04
Say = 1m
Pump head = Static head + dynamic head + Residual pressure
= 5 + 1+15
= 21 , Say 25m
2 filtration pumps have been selected (1duty/1standby) with a capacity of 8.5 L/s each
Select two filtration units (both duty)
Filtration capacity / unit = 4.5 L/s
2) Water Circulation Pump Calculation for RCC fire Water Tank
a) The Tank capacity is = 230 m3
Water to be circulated = Full tank capacity, i.e. 230 m3
No of hours of pump operation = 24 hr.
Hence,
Water Supply Calculations Page 5 of 8
Kitchen Extension at Beach Palace, Abu Dhabi, U.A.E
Water Supply Calculations
Q (pump flow rate) =230 m3/ (24hr x 3.6) = 0.3 L/s, 50 (nominal diameter) pipe
Total head = Residual pressure + static head + dynamic head
Residual pressure = 1.5 bar = 15m
Static head = : Water density (1000 Kg/m3)
g : Acceleration of gravity (10 m/s2)
h : height from pump center
Static head = 5m
Dynamic Losses:
Based on The attached Table for PPR‐PN‐20, 25mm (ND) Pipe shall be considered at
preferred water flow velocity 1.2 m/s and head loss 0.04m/m.
So, dynamic loss = Equivalent pipe length x 0.04m/m
= (1.15 x pipe length) x 0.04
= (1.15 x10) x 0.04
= 1
Pump head = Static head + dynamic head + Residual pressure
= 5 + 1 + 15
= 21, Say 25m
2 circulation pumps have been selected (1duty/1standby) with a capacity of 3.0 L/s each
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Kitchen Extension at Beach Palace, Abu Dhabi, U.A.E
Water Supply Calculations
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Kitchen Extension at Beach Palace, Abu Dhabi, U.A.E
Water Supply Calculations
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