PROJECT: AL FERJAN MARKET
OWNER: QATAR DEVELOPMENT BANK
PLUMBING DESIGN SYSTEM
PROJECT: AL FERJAN MARKET
OWNER: QATAR DEVELOPMENT BANK
REFERENCE: PLUMBING ENGINEERING SERVICES DESIGN GUIDE (BRITISH STANDARD)
LOCAL AUTHORITIES (KAHRAMAA REGULATIONS) STATE OF QATAR.
DOMESTIC MAIN WATER TANK:
TYPE OF OCCUPANCY
Shops =4 Nos.
Security (Dwelling -1 bedroom) =1 Nos.
Accomodation (Dwelling -1 bedroom) =4 Nos.
WATER DEMAND FOR EACH TYPE OF OCCUPANCY
Shops = 300 Gallons
Security (Dwelling -1 bedroom) = 55 Gallons
Accomodation (Dwelling -1 bedroom) = 55 Gallons
TOTAL DOMESTIC WATER DEMAND = (4X300) + (5X55) Gallons
= 1475 Gallons
MAIN WATER TANK CAPACITY AS 48 HOURS STORAGE:
Polyethylene Ground Water Tank
Water tank capacity = 1500 Gallons
Number of water tanks =2
Total capacity = 3000 Gallons
PROJECT: AL FERJAN MARKET
OWNER: QATAR DEVELOPMENT BANK
REFERENCE: PLUMBING ENGINEERING SERVICES DESIGN GUIDE (BRITISH STANDARD)
DOMESTIC BOOSTER PUMPSET CAPACITY @ Pumproom beside Water Tank Yard:
Loading unit (Frequency of use: High and medium) for each shop
Sanitary fixtures Quantity Unit Loading unit Total Loading Unit
Water closet* 1 nos. 5 5
Water closet 1 nos. 2 2
Perenial hose 2 nos. 1 2
Lavatory* 1 nos. 2 2
Lavatory 1 nos. 2 2
Shower 1 nos. 3 3
Kitchen sink 1 nos. 5 5
Washing machine 1 nos. 2 2
Total LU 23
* Denote high usage
Loading unit (Frequency of use: Medium) for security
Sanitary fixtures Quantity Unit Loading unit Total Loading Unit
Water closet 1 nos. 2 2
Perenial hose 1 nos. 1 1
Lavatory 1 nos. 2 2
Total LU 5
Total Number of Shop = 4
Total Number of security = 1
Grand Total Loading Unit = 97 LU
From Plumbing Engineering Design Guide:
Graph 4 for Plastic pipes @ 97 Loading Units; and 1.50 m/s Velocity
From the graph;
flow rate = 1.30 l/s or 20.60 GPM
say 25 GPM
pipe diameter = Ø50 mm
Therefore:
Pump Capacity = 25 GPM @ 40 M Head (1 working + 1 standby)
Pipe Diameter = Ø50 mm
PROJECT: AL FERJAN MARKET
OWNER: QATAR DEVELOPMENT BANK
REFERENCES
6. Premises Requirements :
6.1 Public Houses, Villa And Palace :
In building permit stage, all proposed installation drawings submittals made to the
Installations Section, CSD, should be fully documented and referenced to
KAHRAMAA requirement as :
Ultimate demand including domestic and fire if exist must be determine
signatory demand will be in building permit form, see appendix form ( BPW ).
Due to the premises hydraulic calculation for ( Proposal Demand Designed )
and the expected diameter of service connection that convey the sufficient
water demand to the holding ground reservoir minimum for 48 Hours.
Service cabinet must be installing on the boundary wall to the nearest point to
KAHRAMAA water networks either in front of the premises or at the back, but
must be closer to the main ground water tank. The pipeline must be Copper
or MDPE ( 22 mm up to 54 mm Water Meters ) with the appropriate cabinet.
Those meters install in regular service cabinet, see figure ( GIS / STD / 30 /
04 ) and figure ( GIS / STD / 30 / 02 ) due to the required tie in diameter.
In case of villa or public house, that use pressurizes system the ground tanks
must be sufficient to the relevant high water consumption.
In case of public house or villa that may have ground tanks and roof tanks.
In case of villa with slope roof floor or gables, workshops the roof tank must
be install in steel stand to as elevated tank, see figure ( CSD - CSI - 09 – 01).
The designer has to select suitable water booster pump with sufficient total
head to counter for head loss due to premises height. Pump installation at the
downstream ( Outlet Discharge Point From That Tank ) with non return valve (
One Directional Valve ) that convey water to the roof storage tank of public
house, villas or building roof tank. Roof tanks capacity must be minimum 300
imp gallon for utilities buildings and 400 imp gallon for the house or villa.
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6.4 Commercial Centers ( Flats, Offices And Shops ) :
For commercial center, there must be main water meter cabinet closed to the
tie in point, see figures ( GIS / STD / 30 / 04 ) and ( GIS / STD / 30 / 02 ).
Ground storage tanks should be sufficient for the number of flats and shops
for 48 Hours storage reserve. The down streamline discharge from water
tanks header must be minimum 54 mm that supply each corresponding shop
or flat line with non return valve.
All sub meters are 22 mm and should be at ground floor in a sub meter
cabinet and through each riser for individual roof tank, in this case, the total
number of sub meters required Should Never Exceed 10 Mtrs., otherwise,
sub meters could be in each floor.
6.4.1 Water Meter Service Cabinet Or Chamber :
At the building permit stage, all proposal drawings submitted to Installations Section,
CSD, should be full of allusion to KAHRAMAA requirement as :
Ultimate demand including domestic and fire fighting must be determined in
building permit form citation, see form ( BPW ).
Due to the hydraulic calculation of proposal demand during design stage,
proper selection of pipe diameter for service connection that conveys
sufficient water demand to the holding ground reservoir.
Service cabinet installation on the boundary wall at nearest point to
KAHRAMAA water networks either in front of the premises or at the back, but
must be closer to the main ground water tank. The pipe line must be Copper
or MDPE ( 22 mm Up to 54 mm Water Meters ) with the appropriate cabinet,
meters installation in regular service cabinet, see figures (GIS / STD / 30 / 04)
and ( GIS / STD / 30 / 02 ) due to the required tie in diameter.
If the required main tie in point to the amplitude commercial centre are 80
mm or more, water meter require chamber with GRP cabinet, see figure ( GIS
/ STD / 52 / 06 / A ) with slab 50 mm protruded above Finished Road Level,
gate valve must be installed before the ground water reservoir.
6.4.2 Main Water Tanks ( Ground Tanks Or Ground Reservoir ) :
There must be water tanks very close to the tie in point beneath the meter
cabinet, ground tank must be to KAHRAMAA approved specification.
The supply inlet point to water tank must be on top to each water tank, see
figures ( CSD - CSI - 09 - 01 ) and ( CSD - CSI - 09 - 10 ), water ground tanks
could be regular tanks, sectional panel GRP tanks or concrete tanks, see
figure ( CSD - CSI - 09 - 04 ).
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The downstream discharge points of each water tanks must have 100 mm
header; the set of water booster pumps comprise minimum two working and
one stand by.
The capacity of the main water tanks designed for the sufficient required
demand for flat, shops or office with storage of 48 Hours water storage
capacity.
Ground reservoir could be approved tanks, sectional panel GRP tank or
under ground concrete tanks, see figure ( CSD - CSI - 09 - 04 ).
Cited water tank capacity must be sufficient with the estimated ultimate
demand at the BP (Building Permit) stage for review by KAHRAMAA.
6.4.3 Sub Meters In Commercial Centre ( Flats, Office And Shops ) :
6.4.3.1 In Case Of Sub Meters More Than 10 Meters :
Sub meters installed vertically in the cabinet on 12 mm thickness plywood of
100 mm width fixed at the back of the fabricated cabinet containing plate of
water customer number, see figure ( FSD / FCS / 65 ).
Distance between each pipe is 200 mm ( Outer To Outer ), with 600 mm
height pipe for installation of all sub meters of 22 mm.
Non return valve or one directional valve is required since the line is
conveying water through ceiling at each floor, which needs to be determined
at the BP stage, for review by KAHRAMAA imprimatur.
6.4.3.2 In Case Of Sub Meters Less Than 10 Meters :
In this case total meter required for commercial centre or small building,
which are less or equal to 10 water meters cited and reviewed at BP by
KAHRAMAA imprimatur.
The meters installed at the ground floor level in suitable place with the
required sub meter cabinet, No Water Meter Installation Permitted On
The Roof Of Any Premises Due To This Jurisdiction.
Sub meter installation at the ground floor in proper location in fabricated sub
meter service cabinet mounted on 800 mm block wall, on 12 mm thickness
plywood with 100 mm width fixing water customer number plate, see figure
( FSD / FCS / 65 ), at the back of the fabricated cabinet.
Distance between each pipe is 200 mm ( Outer To Outer ), with 600 mm
pipe heights for the installation of all sub meters of 22 mm.
Non return valve or one directional valve is required since line is conveying
water to the allocated roof tank, see figure ( CSD / CSI / 09 / 05 ).
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