buradan - Yangın

Figure 2. Vertical Shaft Turbine–Type Pump Installation in a Wet Pit.
air pockets sucking inside the suction line, and going to the pump,
which can have a major impact of the pump discharge.
Figure 3.
Table 5.25 (a) Summary of Centrifugal Fire Pump Data (U.S. Customary)
Pump Rating
(gpm)
Suction *†
(in)
2 Entance elbow and square steel vortex
plate with dimensions at least twice the
diameter of the suction pipe. Distance
above the bottom of tank is one-half
the diameter of the suction pipe with
minimum of 6 in. (152 mm)
3. Suction pipe
Dicharge*
(in.)
Relief Valve
(in.)
Figure 4.
BİLDİRİLER KİTABI TÜYAK
PROCEEDINGS BOOK 2009
1.3. Suction Gate Valve
NFPA strongly recommended using OS&Y listed gate valve in
suction line, few users use butterfly valve which effect the stream
of water in suction line, and to avoid suction effect, you need to
have at least 15.3 meter between butterfly valve and pump suction
flange.
1.4. Strain Relief:
“Where the pump and its suction supply are on separate foundations
with rigid interconnecting pipe the pipe shall be provided with strain
relief” many users forget this fitting, which can lead to breaking
the pump flange, in the same time many use it in rubber material,
which is not design to be subject to vacuum, and change of weather
temperature for long time.
Minimum Pipe Sizes (Nominal)
Relief Valve
Discharge (in.)
Meter Device
(in.)
Number and Size of Hose
Valves (in.)
Hose Header
Supply (in.)
25 1 1 ¾ 1 1¼ 1....1½ 1
50 1½ 1¼ 1¼ 1½ 2 1....1½ 1½
100 2 2 1½ 2 2½ 1....2½ 2½
150 2½ 2½ 2 2½ 3 1....2½ 2½
200 3 3 2 2½ 3 1....2½ 2½
250 3½ 3 2 2½ 3½ 1....2½ 3
300 4 4 2½ 3½ 3½ 1....2½ 3
400 4 4 3 5 4 2....2½ 4
450 5 5 3 5 4 2....2½ 4
500 5 5 3 5 5 2....2½ 4
750 6 6 4 6 5 3....2½ 6
1,000 8 6 4 8 6 4....2½ 6
1,250 8 8 6 8 6 6....2½ 8
1,500 8 8 6 8 8 6....2½ 8
2,000 10 10 6 10 8 6....2½ 8
2,500 10 10 6 10 8 8....2½ 10
3,000 12 12 8 12 8 12....2½ 10
3,500 12 12 8 12 10 12....2½ 12
4,000 14 12 8 14 10 16....2½ 12
4,500 16 14 8 14 10 16....2½ 12
5,000 16 14 8 14 10 20....2½ 12
* Actual diameter of pump flage iş permitted to be different from pipe diameter.
† Applies only to that protion of suction pipe specified in 5.14.3.4.
Best type either “dresser type coupling”, or SS type with tie rods.
1.5. Suction Header:
Refer to NFPA20, table
TÜYAK 2009
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