FIXED INSTALLATIONS

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FIXED INSTALLATIONS

• DRY AND WET RISERS

COMPETENCE STATEMENT 373
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AIM To enable the individual to use a rising main
for firefighting
OBJECTIVES 1) Recognize a dry riser
inlet 2) Recognize a dry/wet riser
outlet 3) State the building heights for dry/wet
risers 4) List the actions to be taken to check a
dry riser system 5) Deploy a firefighting jet
from a riser 6) Describe the system to drain a
dry riser 7) Describe typical locations of
dry/wet riser outlets
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TYPES OF BUILDINGS WITH RISERS

• 1) High rise - Dwelling Offices Factories
• 2) Multi - storey car parks
• 3) Shopping centres

Air valve
Dry rising main
Inlet
Drain valve
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DRY RISER INLET

• 1) Usually housed in a wired glassfronted
  box At ground level Near front
  entrance External wall
• 2) Identified by the words DRY RISERpainted in
  red on the glass
• 3) Normally two fire service inlets inside the box

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DRY/WET RISER OUTLET

• 1) A valve with a wheel type handle and a female
  instantaneous coupling
• 2) Direction for opening is shown on the wheel
  itself or on a plate between the wheel and the
  locking nut
• 3) Usually locked closed with a wire and lead
  seal or a leather strap to prevent unauthorised
  use

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LOCATION OF RISER OUTLET

• 1) a) Firefighting staircase lobby
• b) Enclosed staircase
• 2) On every floor or every alternate floor
• 3) May be in a marked glazed cupboard

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ADVANTAGES OF RISING MAINS

• 1) Hose quickly got to work
• 2) Greater capacity
• 3) Less risk of water damage
• 4) Adjacent buildings are covered

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CHECKING DRY RISER SYSTEM

• 1) Ensure all landing valves are closed prior to
  charging
• 2) Drain after use
• 3) Ensure all landing valves are closed before
  leaving
• 4) Report any defects to a responsible person

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DEPLOYING A FIREFIGHTING JET FROM A RISER

• 1) Two lengths of 45mm hose and a branch will
  have been supplied to the floor below the fire
• 2) Taking hose through fire doors from stairwell
  to corridor where fire is may allow products of
  combustion to affect bridgehead
• 3) It may be possible to use Fixed Installation
  hosereels
• 4) Commence salvage operations on the floor below
  the fire as soon as possible

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DRAINING A DRY RISER

• 1) Drain hose out of a window and disconnect
• 2) Close landing valves
• 3) Open drain cock at riser inlet
• 4) If auto air valve is not fitted open top
  landing valve
• 5) If top landing valve was opened close it

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QUESTIONS

• 1) State the building heights for both dry and
  wet risers
• Buildings greater than 18m Dry Riser.
• Buildings greater than 60m Wet Riser.
• 2) Where would the dry riser inlet usually be
  found?
• At ground level.
• Near front entrance.
• External wall.
• 3) What is the purpose of the air valve in a dry
  rising system?
• Vents air out of system when charging and lets
  air into system when draining.

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QUESTIONS contd

• 4) List four advantages of using rising mains
• Hose quickly got to work.
• Greater capacity.
• Less risk of water damage.
• Adjacent buildings are covered.
• 5) List the precautions taken when checking dry
  risers
• Ensure all landing valves are closed prior to
  charging.
• Drain after use.
• Ensure all landing valves are closed before
  leaving.
• Report any defects to a responsible person.

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QUESTIONS contd

• 6) Where are riser outlets normally found?
• Firefighting staircase lobby.
• Enclosed staircase.
• On every floor or every alternate floor.
• May be in a marked glazed cupboard.
• 7) Name three types of building where risers are
  normally installed
• High rise- Dwellings
• Offices
• Factories
• Multi-storey car parks
• Shopping Centres

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QUESTIONS contd

• 8) What device is fitted to landing valves to
  protect fire brigade hose and on what type of
  riser would it be found?
• Pressure regulators on Wet Risers.
• 9) What are the three sources of water for a wet
  riser?
• 1) Water Main, 2) Gravity Tanks, 3) Booster
  pumps supplied from storage tanks.
• 10) What is the procedure for draining a dry
  riser?
• a) Drain hose out of a window and disconnect.
• b) Close landing valves.
• c) Open drain cock at riser inlet.
• d) If auto air valve is not fitted open top
  landing valve.
• e) If top landing valve was opened close it.