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How to calculate head of a pump in a fire fighting & plumbing system in a building?

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Question added by Manas Bhjattacharjee
Date Posted: 2016/02/29

Water Supply Pump Calculation

Working Hours :8Hours

No. of Person :54Persons

Water Consumption / person :100L/day

Total water consumption :   5.400 L/day

                                     :     11,25L/min

Water tank (1 day) :5.400 L

 

Water Supply pump :33,75L/min

 

Pump capacity calculation Based on Sanitary Fixture

 

No.Sanitary                 Qty      Flow Req / unitTotal FlowMin Pressure

 

1Faucet / Tap           0                15                       0                 0,3

 

2Garden Faucet   0                   15                          0                 0,3

 

3Closet Flush           0                40                       0                 0,4

 

4Closet Low level   8                10                      80                 0,3

 

5Urinal                   2                20                      40                 0,4

 

6Shower                                18                        0                 0,7

 

7Lavatory / Sink  8                10                      80               0,3

 

 

Total                                                                     200

 

Pump Capacity200  x 30 %=    60L/min

Zahid Ayaz
by Zahid Ayaz , Senior Mechanical Engineer , Hemayah fire and safety LLC Dubai

heighest point from lower level + working pressure of sprinklz..

chetan sharma
by chetan sharma , Senior project engineer , trinity engineering services

Total head is based on first the flow rate is set and then based on the flow rate the pipe is sized and then based on that size the friction factor for the type of pipe is found out and then based on that the friction loss in pipe is found out ,for the fittings you can use two method one is k factor for the fittings generally employed in chilled water pipe and other method is equivalent length of pipes adding up the total head and friction loss we get the total head in psi,bar,mtr or feet

in case transfer pump for over head tank filling .total height and horizontal pipe length and number of bent 

 in case booster pump installing ground tank check last point  height .and how much bar presser need

in case roof top pressure pump installation check how much bar pressure need  

Bowo Prasetio
by Bowo Prasetio , Staff Design & Estimate Mechanical Engineering , PT. Taikisha Indonesia Engineering

FIRE FIGHTING SYSTEM

PROJECT : XXX PROJECT

REGULATION : FIRE PREVENTION AND PROTECTION FOR BUILDING AND STRUCTURES

DESIGN REQUIREMENTS (TCVN - 2622 : 1995)

 

1)BUILDING INFORMATION:

[]Type of Building: Factory                         []     Production Class: -

[]Volume of Building (Maximum area): 36.207 m3 []Fire resistance Class of Building: -[]Area: 4.860 m2                                                 []     Outdoor piping required: required

2)FIRE HYDRANT SYSTEM:

[]Internal Fire Hydrant Box: 4 Sets                         []     External Fire Hydrant Box: 4 Sets

Simultaneous operation number: 2 Sets                (1)Simultaneous Fire number: 2 Fire (4)

Water Flow for each Hose: 2,5 l/s                        (2)Water Flow for each Fire: 15 l/s (5)

Hose Length: 30 m                                        Hose Length: 30 m

Hose Size: 50 A                                                Hose Size: 65 A

Water Flow Requirements: (1)x(2) 300 l/min         (3)Water Flow Requirements: (4)x(5)                                                                                                                                 1800 l/min (6)

 

[]Fire Hydrant Pump Requirements:

Capacity:Max [(3) and (6)] Q = 1800 l/min

Pump Head Calculation:

Pipe Length (Maximum): 126 m

Pipe's Fitting (Pipe equivalent Length): 63 m

Valve (Pipe equivalent Length): 50 m

Unit Friction Loss: 50 mmAq/m

Total Pipe Friction loss 11,95 mAq

 

Potential difference: 8 mAq

Fire Hydrant Hose Friction loss: 5 mAq

Nozzle Pressure: 8 mAq

 

Safety Factor: k = 1,1

 

Total Pump Head Requirements: h = 36,25mAq

 

[]Fire Hydrant Pump Selection:

Electric Pump                          Jockey Pump

Suction x Discharge size: (looking selection pump)  Suction x Discharge size: (looking                                                                                                                                                               selection pump)

Capacity: 2000 l/min                                                   Capacity: 200l/min

Pump Head: 40mAq                                  Pump Head: 50 mAq

Motor Capacity:(looking selection pump) Kw  Motor Capacity: (looking selection                                                                                                                                                             pump) Kw

Phase:3 phase                                             Phase: 3 phase

Pump's Accessory:  Priming Tank [ ? ]

                    Control Panel [ ? ]                  Elevated Tank Capacity: 60 m3

 

 

[]Water Storage Tank: (Underground Concrete Made) Q = 60 m3 or Regulation Local

[]Fire Dept. Car Connection size: 100 x 2A

 

[]Piping system:[] Material Galvanized Steel

                [] Main Pipe size:150 A

                [] Branch Pipe size: 50 A

 

3)FIRE EXTINGUISHER SYSTEM:

[]Fire Extinguisher ABC 3,5 Kg; 21 Sets

[]Fire Extinguisher ABC  -  Kg;  - Sets

[]Fire Extinguisher CO2  -  Kg;  - Sets

[]Fire Extinguisher CO2  -  Kg;  - Sets

 

4)DESIGN DRAWING FOR FIRE PROTECTION SYSTEM:No.Drawing Name

M-3Fire Hydrant system schematic

 

---------------------------------------------------------------------------------------------------------------------------------------------

 

PT. TAIKISHA INDONESIA ENGINEERING

 

Project : XXX Project

 

Water Supply Pump Calculation

Working Hours :8Hours

No. of Person :54Persons

Water Consumption / person :100L/day

Total water consumption :   5.400 L/day

                                     :     11,25L/min

Water tank (1 day) :5.400 L

 

Water Supply pump :33,75L/min

 

Pump capacity calculation Based on Sanitary Fixture

 

No.Sanitary                 Qty      Flow Req / unitTotal FlowMin Pressure

 

1Faucet / Tap           0                15                       0                 0,3

 

2Garden Faucet   0                   15                          0                 0,3

 

3Closet Flush           0                40                       0                 0,4

 

4Closet Low level   8                10                      80                 0,3

 

5Urinal                   2                20                      40                 0,4

 

6Shower                                18                        0                 0,7

 

7Lavatory / Sink  8                10                      80               0,3

 

 

Total                                                                     200

 

Pump Capacity200  x 30 %=    60L/min

 

 Pump Head

 

 Sanitary         =7mH

 Gravity level         =8,2mH

 Pressure Tank =8mH

 Piping and Valve =70m x 0.05 mAq/m =3,5mH

 Total Head         =26,7 mH

 

 Pump Head          =29mH

 

Pump Spec.

 Package Booster Pump  Parallel & Alternate Operation

 Capacity : 90 L/min x 30 mH x 2 Units

 

 

Sherif Mohammed Ibrahim
by Sherif Mohammed Ibrahim , Senior Mechanical Technical engineer , Al-Latifia Trading & Contracting Company

it is better to learn how to do it in Elite fire program

in general :

total pump head = height from lowest point to the highest point + friction due to pipes and fitting to the last point + working pressure of the sprinkler

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