1. Future Hazard Analysis in EN 12845 ‘Occupancy and Storage Classification’
Stuart Lloyd
Principal Fire Protection Engineer
Zurich Risk Engineering UK

2. Agenda EN 12845 status The past & current hazard analysis
Moving forward
Non Storage
Storage
Special Hazards

3. Status Current EN 12845 issued in 2009 EN 12845:2004 +A2
included amendments A1 and A2
Next EN to be published end 2014
EN Revision 1 (EN 12845:2014)
Future EN 12845
EN Revision 2
In development
focus of this presentation

4. Occupancy Classification Taken from BS 5306 part 2 1990 (UK)
TYPE OF OCCUPANCY
Non industrial where the
amount and combustibility of the contents is low
Commercial and industrial
Processing and handling
mainly ordinary combustible
materials unlikely to develop intensely burning
fires in the initial stages
Classification - Ordinary Hazard Group I,II,III
or IIIS (see table 3)
For example, some areas of: Hospitals
Hotels
Libraries
Museums
Nursing homes
Office buildings
Prisons
Schools,
Colleges, etc
Goods storage - with abnormal
fire loads likely to produce
exceptionally intense fires
with a high rate of heat
release
Process hazards - extra
hazardous, likely to
develop rapidly and
intensely burning fires
Attics
basements
boiler rooms
kitchens
laundries
storage spaces
workrooms
Category of goods type and height of storage
Classification - Ordinary Hazard
Group III
Classification - High Hazard
high piled
storage
Storage methods
S1 to S8
Type S9 or
S10 potable
spirit stores
process hazard
Classification – Light Hazard
Mention that ‘some’ or ‘parts of premises’ are often ignored
January 2008

5. Occupancy Classification (EN & CEA) Developed from text in standards (not illustrated)
TYPE OF OCCUPANCY
Non industrial (where the
amount and combustibility of the contents is low)
Commercial and industrial
Processing and handling
mainly ordinary combustible
materials unlikely to develop intensely burning
fires in the initial stages
Classification - Ordinary Hazard Group I,II,III,IV
For example, some areas of: Hospitals
Hotels
Libraries
Museums
Nursing homes
Prisons
etc
Goods storage - with abnormal
fire loads likely to produce
exceptionally intense fires
with a high rate of heat
release
Process hazards - extra
hazardous, likely to
develop rapidly and
intensely burning fires
Attics
basements
boiler rooms
kitchens
laundries
storage spaces*
workrooms
Category of goods type and height of storage
Classification - Ordinary Hazard
Group III, IV
Classification - High Hazard
high piled
storage
Storage methods
ST1 to ST6
process hazard
Classification – Light Hazard
Mention that this is not illustrated in EN12845, perhaps an oversight?
HHP 1,2,3,4
*Storage may be High Hazard due to storage height/block size 5 5

6. EN 12845 Revision 2 - Simplification of Hazard Classes
Current (10 options)
Light Hazard (LH)
Ordinary Hazard (OH 1,2,3,4)
High Hazard Process (HHP 1,2,3,4)
High Hazard Storage
Future (5 options)
Fire Hazard 1
Fire Hazard 2
Fire Hazard 3
Fire Hazard 4

7. Future Density/Area for each FH
Fire Hazard
Old designation
Density mm/min
Area wet m²
Area dry m²
FH1
LH/OH1 5 72 90
FH2
OH2/OH3
216
270
FH3
OH4/HHP1
7,5
260
325
FH4
HHP2/HHP3
12,5
The most widely used density/areas have been adopted going forward

8. Non Storage Occupancies

9. Clearer Guidance Non-manufacturing example
Educational Facilities
Universities
Schools
Colleges
Nurseries
Prisons
Gymnasiums
Construction made of concrete or steel, low combustible load, no carpets.
FH1
Construction other than concrete or steel, combustible load larger than defined as FH1, Typical technical rooms with hydraulic units less than 100 L, laundries with less than hydraulic units of 100 L
FH2
Storage Rooms.
HHS
Some aspects based on construction
All aspects based on risk evaluation
Tables identify ‘typical risks’ associated with premise type

10. Clearer Guidance Manufacturing example
Manufacturing occupancies and their associated Fire Hazard Class continued.
Occupancy
Description
Special Consideration
Fire Hazard
Mechanical Engineering
Or Assembling Plant
-Sheet metal product factories
-Metal working
-Electric and Electronics
equipment factories
- White Appliances factories
- Circuit board manufacturing
- Car workshops
- Fire-lighter manufacture
Water-based emulsion for grinding, drilling, cutting, stamping processes
FH2
injection molding (plastics) for PP/PE/PS or similar plastics
Use of plastic logistic aids (baskets, trays, boxes, pallet, etc..)
Soldering process
Paint application shops with water-based paint
Electrostatic paint application
Process where combustible liquids or cutting oils are used
FH3
Printing works (metal foil)
Paint application shops with solvent
Plating processes
Processes involving corrosive materials requiring plastic piping
Processes using flammable liquids.
Fire-lighter filling process.
FH4

11. Storage Classification
Sprinklers designed and specified against a hazard classification and are proven flexible
Water mist is application specific
Categories will be called HHS
Will include 5 Categories

12. Storage – Categories of Goods
Category I and II
will remain unchanged and be called HHS 1 and HHS 2
Category III and IV are being evaluated
will be split into three groups HHS 3, HHS 4 and HHS 5
HHS 3 - Cartoned Unexpanded Plastics (laptop in box)
HHS 4 – Uncartoned Unexpanded Plastics (garden chair)
HHS 4 – Cartoned Expanded Plastics (pillows in box)
HHS 5 – Uncartoned Expanded Plastics (sheets of polystyrene)
You should think of HHS 4 as Category 3.5
New designations will accommodate protection by proven protection schemes such as CMSA from USA

13. Special Hazards Intended to include specific design solutions
Tyre storage
Aerosols
Hanging garments
Etc….

14. Future Flow Chart

15. Thank You,
Any Questions?