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DRY & WET DRY & WET
RISER RISER
SYSTEMSSYSTEMS
Who to decide on the nos. of wet riser main/Dry riser system to be installed ?
• Architect
Where to locate the wet/dry riser ?
• To be decided by Architect
Design Criteria
Numbers of rising mains depend on :
• Each rising main serves not more than 930m2 of floor area
• Cover a distance of 38m from a landing valve
The riser and landing valves shall be housed in:
• A protected area or lobby or shaft
Where to locate the breeching inlet
Design Criteria
Breeching inlet shall be less than 18m from the fire engine hard standing
Conspicuous position and accessible to the fireman
TYPE OF THE SYSTEMTYPE OF THE SYSTEM
LANDING LANDING VALVEVALVE
Dry Riser SystemDry Riser System
BREECHING INLETBREECHING INLET
AIR AIR RELEASEDVALVERELEASEDVALVE
Requirement of dry riser installation
• For residential building height more than 45m but less than 60m, or with basement or commercial building
• Ø100mm dry riser main pipe is for building height from 10m to 45m
• Ø150mm dry riser main pipe is for building height from 45m to 60m
Requirement of dry riser installation
•2- way breeching inlet for Ø100mm rising main
•4- way breeching inlet for Ø 150mm rising main
Breeching Inlet
Air Release valve
Hand Wheel
Landing Valve
Anti-Thief Device
FSSB SUBMISSION IS NOT REQUIRED FSSB SUBMISSION IS NOT REQUIRED
LOCAL AUTHORITIES SUBMISSIONLOCAL AUTHORITIES SUBMISSION
Submission
ConventionalConventional
PUMP FEED
GRAVITY FEED
TRANSFER PUMP
WET RISER PUMPS
JOCKEY PUMP
FROM PUB SUPPLY
4 WAY BREECHING INLET
LANDING VALVE
Old designOld design
• Non conventional - phase out
FROM PUB SUPPLY
AIR RELEASE VALVE
LANDING VALVE
DOMESTIC FEED
Tanks
WET RISER PUMP
4 WAY BREECHING INLET WET RISER TANK
Down Comer System Down Comer System
DOMESTIC
21 ST STOREY
25TH STOREY
BREECHING INLET
Ø100mm GI PIPE
1ST STOREY
Between 60m to 70 m
WET RISER
Phase out for New Building (17 Sep’01)
Transfer Water Tank Design
• One rising main = 11.5 m3 (15min) @ 27 l/s
• Two rising main = 23 m3 (15min) @ 38 l/s
Roof top wet riser tank layoutRoof top wet riser tank layout
DIA 3.621m 1m
2m
3m length for pump set
1mRing tanks
3-Rings Tank
3 nos. = 49 m3
5 nos. =75 m3
ACOUSTIC SOUND INSULATION
3
1
12m
7m
4-Rings Tank
2 nos. = 49 m3
3 nos. =75 m3
Wet riser tank capacity
• One rising main capacity = 49 m3 for half hours + 1.1 m3 fire hose reel
• Two rising main capacity=74 m3 for half hours +1.1 m3 fire hose reel
Building Above 120mBuilding Above 120m
FROM PUB SUPPLY
1ST STOREY
Mid-Storey
Roof Storey
WET RISER PUMPHOSEREEL PUMPTRANSFER PUMP
Down feed
Down feed
Transfer tanks
Power required
• PUB supply• Generator - supply to 4 blocks per generator
FSSB SUBMISSION IS REQUIRED FSSB SUBMISSION IS REQUIRED
LOCAL AUTHORITIES SUBMISSIONLOCAL AUTHORITIES SUBMISSION
Submission
50TH STOREY HEIGHT BUILDING50TH STOREY HEIGHT BUILDING
WET RISER AND HOSEREEL SERVICE WET RISER AND HOSEREEL SERVICE DUCTDUCT
TESTING AND TESTING AND
COMMISSIONING OF WET COMMISSIONING OF WET
RISERRISER
WET RISER REQUIREMENTSWET RISER REQUIREMENTS
RESIDENTIAL COMMERCIAL & ANY MIXED BUILDING FLOW RATE 27L/S FOR FIRST 38L/S FOR THE FIRST RISING MAIN RISING MAIN 19L/S FOR EACH ADDITIONAL 13.5L/S FOR EACH RISING MAIN ADDITIONAL RISING MAIN MAXIMUM SUPPLY RATE OF 190L/S MAXIMUM SUPPLY RATE OF 135 L/S
RUNNING PRESSURE 3.5BAR TO 5.5 BAR 3.5 BAR TO 5.5 BAR
STATIC PRESSURE 8 BAR 8 BAR
PLAN VIEW FOR WET RISER AND PLAN VIEW FOR WET RISER AND HOSE REELHOSE REEL
Check Valve
Gate Valve
Drain Cock
Check Valve
Rubber Expansion Joint
Gate Valve c/w
limit switch
Pilot Valve
Motorize Valve
Pressure Relief Valve
Bypass system
Flow Meter
Motorize Valve
Gate Valve
Down feed
Pilot Valve
Check Valve
Flow Switch
Down feed Pipe
Duty Pump
Standby Pump
Fire Pump
Jockey Pump
Level Indicator
Landing ValveStrap Lock
Air Release
valve
Drain Cock
Limit Switch
Butterfly valve
Check Valve
Piping
Pressure Switches
Pressure Gauge
Limit Switch Indicator Panel
Alarm Bell
Fire Extinguisher
Wet Riser Control Panel
