foundation system of burj al arab

Design Consideration for Standpipe and Hose System in Fire Protection System

In multi-story buildings a type of rigid water piping is provided to connect fire hoses. Within buildings these pipes serve the same purpose of fire hydrants. This system allows manual application of water to the fire. Dear readers, these pipe is called Standpipe. In this post I shall discuss Design consideration for Standpipe and Hose System 


1.The fire protection system shall be designed for their effective use either by amateur or trained fire fighting personnel or both. 
Building Type
Sprinkler System (l/min)*
Standpipe and Hose system (l/min)*
Duration**
(min)
Light hazard - I
1000
1000
30
Light hazard - II
1900
1900
50
Ordinary hazard - I
2650
1900
75
Ordinary hazard - II
3200
1900
75
Ordinary hazard - III
4800
1900
75
Notes:
* Values will be for one riser serving floor area of 1000 m2.
**These duration shall be for a building up to the height of 51 m. For greater height of 51-102 m and  above 102 m, the duration will be 1.25 times and 1.5 tomes of the specified values respectively.
Light hazard – I          : Occupancy groups, A1, A2, A4
Light hazard – II        : Occupancy groups, A3, A6, A8, B, C, D, E4, E7, F1 & F2
Ordinary hazard – I   : Occupancy groups, E1, E3, E5, F3, F4, F5, F6, F7, G1 & G4
Ordinary hazard – II  : Occupancy groups, G2 & H1
Ordinary hazard – III : Occupancy groups, G3 & H2
Extra hazard : Occupancy groups, j – pressure and flow requirement for this group shall be determined by Fire Department but shall not be less than required value for Ordinary hazard-III

2. All standpipes in standpipe system shall be sized so that they will provide a minimum flow specified in Table-1. In standpipe system with more than one standpipe, the supply piping shall be sized for the minimum flow specified in Table-1 for the first standpipe plus 1000 litre per minute for such additional standpipe. The total number of such additional standpipes shall not be more than 8. All standpipe risers shall be connected through a gate valve with a main of size equal to that of the largest riser. 

3. The minimum pressure for standpipes supplying a 50 mm or larger hose shall be at least 300 Kpa. For standpipe supplying first aid hose (38 mm nominal) may have a minimum pressure of 200 Kpa. 

4. The size (diameter) of stand pipes for various building height may be as shown in Table -2 or hydraulically designed to provide the required flow and pressure, stated above, at the topmost outlet.

Table-2 : Standpipe Sizes

No. of Storeys
Building Height(m)
Size of Stand pipe(mm)
Up to 5
UP to 17
75*
Up to 10
UP to 33
100
10 to 20
33 to 63
150
20to 54
63 to 65
200
*These pipe may be used only for occupancy groups A1, A2 and A4











5. The water supply required for combined system (for partial automatic sprinkler and Fire Department hose) shall be calculated in accordance with (2) above plus an amount equal to the hydraulically calculated sprinkler demand or 550 litre per minute for light hazard occupancy groups or 1900 litre per minute for ordinary hazard occupancy groups. 

Table-3 : Piping for Standpipe System
Materials
Standard
Copper Tube
ASTM B75, ASTM B88
Copper and Copper-Alloy Tube
ASTM B251
Steel Pipe
ASTM A55, ASTM A120, ASTM A135
Wrought Steel or Iron
ANSI B36.10

6. The size of combined system shall be at least 150 mm or hydraulically designed to provided the required flow (5) and pressure. 

7. The standpipe shall be located in noncombustible enclosure such that it will be able to provide hose stream to the most remote area of the floor served. 
Table-4 : Standpipe Fittings
Materials
Standard
Cast Iron
ANSI 616.1, ANSI B 16.4
Copper
ANSI B16.18, ANSI B16.22
Malleable Iron
ANSI B16.3
Steel
ANSI B16.5, ANSI B16.9, ANSI B16.11, ANSI B16.25, ASTM A234
8. The hose shall be connected to the standpipe within 1.5 m from the floor. Hose stations shall be easily accessible for inspection and testing.

2 comments:

  1. Standpipes are most commonly built in buildings in vertical position. These make fire fighting for the fire fighters easier. Just by connecting the fire hoses to it.

    ReplyDelete
  2. Thank you for sharing this information.
    It will really helpful to solve my confusion

    Process $ Chemical Engineering

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