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GROUP MEM ERSNIK SHAHIRAH NIK HISHAM

2009448268ZAINUN HANANI ZAINAL KASIM

2009884714SITI NOOR AMIRAH ROSDI.

2009250596

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WET RISER.

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INTRODUCTION A form of internal hydrant for the fireman to use. Always charged with water

Only required for buildings where the topmost floor ishigher than 30.5 above.For high rise building, each stage of the wet riser shouldexceed 70.15 meter.

A jockey pump is usually provided to maintain systempressure.

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LABEL OF WET RISER

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Wet riser systemis normally

installation in ahigh rise building

or industry building

It has a

constantly pressurizedwater pipe

supplied by astorage tankwith a pump

It have three pump:

Jockey pump Duty pump Stand by pump

Installed the hose

and nozzle that prepared inlanding valve

open slowlyvalve and water

will flow out and pump willoperate

automatically

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COMPONENT OF

WET RISERLanding valveBreeching inlet

Wet riser pipe wet riser pump

Jockey pump

Duty pump

Standby pump

wet riser tank

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LANDING VALVE

Flange forconnection towet riser

Connection to firebrigade canvas hose

Detail of a landing valve .

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LANDING VALVEProvided on each floor and should comply with M.S 1210 :part 1.Usually located within fire fighting access lobbies , protectedstaircases or other protected lobbies.Installed at not more than 0.75 meters from the floor.Boxes can be provided to protect landing valves and shouldcomply with M.S. 1210 : part 4.Quick coupling jet and spray nozzle should be provided in

hose cradle beside each landing valve.

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BREECHING INLET

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BREECHING INLET

Firemen can pump water into the wet riser storagetank to make up water use.Should be 4 way type comply M.S 1210 part 3.Drain should be provided at the bottom of the riser to

drain the system after use.Should be located not more than 18 metres from thefire appliances access road.Not more than 30 metres from the nearest externalhydrant.

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LandingvalveWet riserpipe

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WET RISER PIPEUsually located within smoke free lobby. All spaces are to be within a 45 metres from landing valves. Where more than one riser is required for each floor,the distance apart between the risers should notexceed 60 metres .The riser pipe should be 150 mm galvanised iron to B.S1387 ( Heavy gauge ) or class c.This return pipe shall be minimum 100mm diametergalvanised iron to B.S 1387 ( Medium gauge ) Or classB. All wet riser pipes should be coated with primer andfinished with red gloss paint.

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WET RISER PUMPDraw water from wet riser storage tank.Fire rated type are from electrical cabling to supplypower to wet riserShould be protected from fire and away from location

likely to be floodedConsists of three (3): Jockey pump

Duty pump Standby pump

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JOCKEY PUMPThe first pump that will bestart.

The pump will be started atpressure of 150 psi and stop it when the pressure reaches 230psi.

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DUTY PUMP

Wet riser landing valve has beenopened if the pressured dropbelow 125 psi.

The pressured switch senses thisset pressure activates and starts.

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STANDBY PUMP Standby pump take over thefunction there is not performby duty pump.The standby pump is set to cutin at 95 psi.Standby pump stop after thecut out pressure is reach at 220psi.Should be supply with powerfrom the emergency generator.

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WET RISER TANKShould be sized for a minimum effective capacity of45,500 liter with automatic refill rate of 455 I/min.The intermediate break tank for upper stages of the wet riser should be not less than 11,375 litres with anautomatic make up flow off 1365 I/min.

May be of pressed steel , fibre reinforced polyester(FRP) or concrete.The water tanks should be compartmented by

Ball f loat valves

Overflow pipes Drain pipes Water level indicators

Wet riser tank may be located on the ground floor,first or second basement.

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OPERATIONThe pipe will connect through hose coupling.Pump will be active when the switch is on.

Landing valve will be on.The bottom on landing valve has a plate called orifice which is limited the pressures of landing valves.The valve from the tank will go straight pipe that wasconnected with hose coupling.The excess water will f low through drain pipe wherethe process will repeat the same operation.The landing valve will turn off when it has been used

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THANK YOU