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LPC Rules for automatic

sprinkler installations

variations to

BS EN 12845: 2009TB229.1 INTRODUCTION

This Technical Bulletin introduces variations from BS EN 12845 to make the specification

suitable for use. The Technical Bulletin includes LPC Rules amendments which have

been drawn up by the Active Steering Group of RISCAuthority, either as modifications to

the CEN 2009 amendments or as changes to the content of BS EN 12845.

TB229.2 GENERAL

A brief description of the change is given under each heading.

Revised or new text is shown in italic bold underlined font.

To aid understanding of some changes, deleted text has been depicted using

strikethrough text.

Where changes have been introduced by this Technical Bulletin to the proposed

amendments, the details of the change and, where appropriate, reasons for the change

have been given.

Table notes have the status of recommendations whilst Table footnotes are

requirements.

TB229.3 VARIATIONS TO BS EN 12845: 2009

TB229.3.1 BS EN Table 2

Description of changes:

Renumber Note 3 to Note 2, column 4, row 2 and row 8;

Change Note 2 to footnotea, rows 2, 3, 4, 5, 7 and 8;

Insertion of Note 2 as footnote a.

Table TB229.T1 Limitations and protection requirements for different storage configurations BS EN Table 2

(amended)

Storage

configurationLayout limitations

Protection in addition to sprinklers

at ceiling or roof

Applicable table

notes:

ST1Storage shall be confined to blocks

not exceeding 150m2 in plan area for

C III and IV

None (2, a)

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Table TB229.T1 Limitations and protection requirements for different storage configurations BS EN Table 2

(amended)

Storage

configurationLayout limitations

Protection in addition to sprinklers

at ceiling or roof

Applicable table

notes:

ST2Aisles between rows shall be not

less than 2,4m wideNone (a)

ST3Storage shall be confined to blocks

not exceeding 150m2 in plan areaNone (a)

ST4

Aisles separating rows are equal or

greater than 1,2m wide

Intermediate sprinklers are

recommended(1, a)

Aisles separating rows are less than

1,2m wide Intermediate sprinklers are required(1)

ST5

Either the aisles separating rows

shall be no less than 1,2m wide, or

storage blocks shall be no more than

150m in plan area

Intermediate sprinklers are

recommended(1, a)

ST6

Either the aisles separating rows

shall be no less than 1,2m wide, or

storage blocks shall be no more than150m in plan area

Intermediate sprinklers are required

or, if this is impossible, continuous

full height vertical bulkheads with

Euroclass A1 or A2 or an equivalent

in existing national classification

systems shall be fitted longitudinally

and transversely within each shelf

(1, a)

Note 1: When the ceiling is more than 4m above the highest level of stored goods, intermediate levels of in-rack

sprinklers should be used.

Note 2:Storage blocks should be separated by aisles no less than 2,4m wide.

Note 3: Note 2: Storage should be confined to blocks not exceeding 150m2 in plan area for C I and C II.

a Storage blocksshallbe separated by aisles no less than 2,4m wide.


Description of change:

Amend Note 2 to delete and alternate.

LPC Rules requirements change table note to footnote (b) and insert footnote (a)

concerning alternate systems.

Table TB229.T2 Design criteria for HHS with roof or ceiling protection only (Replacing BS EN Table 4)

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Storage

configuration

Maximum permitted storage height(1)

m Design

density

mm/min

Area of

operation (wet

or pre-action

system(2, a, b))

mCategory I Category II Category III Category IV

ST1 Free

standing or

block stacking

5,3

6,5

7,6

4,1

5,0

5,9

6,7

7,5

2,9

3,5

4,1

4,7

5,2

1,6

2,0

2,3

2,7

3,0

7,5

10,0

12,5

15,0

17,5

260

5,7

6,3

6,7

7,2

3,3

3,6

3,8

4,1

4,4

20,0

22,5

25,0

27,5

30,0

300

ST2 Post pallets

in single rows

ST4 Palletized

racks

4,7

5,7

6,8

3,4

4,2

5,0

5,6

6,0

2,2

2,6

3,2

3,7

4,1

1,6

2,0

2,3

2,7

3,0

7,5

10,0

12,5

15,0

17,5

260

4,4

4,8

5,3

5,66,0

3,3

3,6

3,8

4,14,4

20,0

22,5

25,0

27,530,0

300

ST3 Post pallets

in multiple rows

ST5 and ST6

Solid or slatted

shelves

4,7

5,7

3,4

4,2

5,0

2,2

2,6

3,2

1,6

2,0

2,3

2,7

3,0

7,5

10,0

12,5

15,0

17,5

260

Note 1: The vertical distance from the floor to the sprinkler deflectors, minus 1m, or the highest value shown in the

table, whichever is the lower.

Note 2: Dry and alternate systems should be avoided on High Hazard storage especially with the more combustible

products (the higher categories) and the higher storage.aLPC Rules requirements Alternate systems are no longer permitted. bLPC Rules requirements Should it nonetheless be necessary to install a dry system, the area of operation

should be increased by 25%.



Amend Note 2 to delete and alternate.

LPC Rules requirement change part of table note 2 to table footnote.

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Table TB229.T3 Design criteria for roof or ceiling sprinklers with in-rack sprinklers

(Replacing BS EN Table 5)

Storage

configuration

Maximum permitted storage height above the top level of

in-rack protection(1)

mDesign

densitymm/min

Area of

operation (wet

or pre-actionsystem(2))

mCategory I Category II Category III Category IV

ST4 Palletized

racks3,5 3,4

2,2

2,6

3,2

3,5

1,6

2,0

2,3

2,7

7,5

10,0

12,5

15,0

260

ST5 and ST6

Solid or slattedshelves

3,5 3,4

2,2

2,63,2

1,6

2,0

2,3

2,7

7,5

10,0

12,5

15,0

260

Note 1: The vertical distance from the highest level of in-rack sprinklers to the top of the storage.

Note 2: Dry and alternate systems should be avoided on High Hazard storage especially with the more combustible

products (the higher categories) and the higher storage.aLPC Rules requirement Should it nonetheless be necessary to install a dry system, the area of operation

shall be increased by 25%.

TB229.3.4 BS EN Clause 8.5.2Description of changes:

Insertion of LPC Rules requirement as fourth paragraph.

BS EN Clause 8.5.2 At water supplies

Additional LPC Rules requirement: Where a permanent flow test facility is not

provided which returns the test flow to a water storage tank (cistern) or

alternatively to a permanent drain, temporary measures shall be provided to safely

dispose of the waste water.



Insertion of LPC Rule requirement, column 2, row 7;

Insertion of and LPC Rules requirement as footnote, row 8;

Insertion of LPC Rules commentary and recommendation, row 9.

Table TB229.T4 Minimum effective capacity of reduced capacity tanks (Replacing BS EN Table 11 )

Hazard classMinimum effective capacity(a)

m3

LH Wet or pre-action 5

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Table TB229.T4 Minimum effective capacity of reduced capacity tanks (Replacing BS EN Table 11 )

Hazard classMinimum effective capacity(a)

m3

OH1 Wet or pre-action 10

OH1 Dry or alternate

OH2 Wet or pre-action20





HHP and HHS

70

but in no case less than 10% of the full capacity

LPC Rules Requirement:

2/3 of the value specified in BS EN Table 10 or

BS EN 9.3.2.3

or

the value specified in BS EN Table 10 or BS EN

9.3.2.3 less the infill flow rate, in l/min, multiplied by

0,09, whichever is the greater

See footnote(a)

Additional LPC Rules requirement:a When determining the minimum effective capacity of a reduced capacity tank, a maximum of 80% of an

adjusted infill flow rate, verified by test, shall be used. The adjusted infill flow rate shall take into account any

reductions in flow due to static head and friction between the test point and the tank infill at a period of

maximum demand.

LPC Rules commentary and recommendation:

The water supplier should be consulted before using town mains as infill for reduced capacity tanks. It is

essential to establish that the performance of the town main will not depreciate over the life of the sprinkler

system water supply.

TB229.3.6 BS EN Clause 9.6.4


LPC Rules requirement replacing BS EN Clause 9.6.4.

BS EN Clause 9.6.4 Combined water supplies

Combined water supplies shall be superior single or duplicate water supplies designed to

supply more than one fixed fire fighting system, as for example in the case of combined

hydrant, hose and sprinkler installations.

Note: Some countries may not allow sprinkler systems to be fed from a combinedsupply.

Combined supplies shall fulfil the following conditions:

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a) the systems shall be fully calculated;

b) the supply shall be capable of supplying the sum of the simultaneous maximum

calculated flows from each system. The flows shall be corrected up to the

pressure required by the most demanding system;

c) the duration of the supply shall be no less than that required for the most

demanding system;

d) duplicate pipe connections shall be installed between the water supplies and the

systems.

TB229.3.6 Combined water supplies (Replacing BS EN 9.6.4)

The sprinkler system pumps and water source shall be separate from any hydrant

system pumps and water source.



LPC Rules requirement replacing BS EN Table 17.

Table TB229.T5 Maximum size of wet pipe and pre-action installations (Replacing BS EN Table 17)

Hazard classMaximum size of protection per control valve set

m2

LH 10 000m2

OH, including any LH sprinklers12 000m2

except as allowed in annexes D and F

HH excluding in-rack sprinkler protection,

including any OH or LH sprinklers,9 000m2

HH in-rack sprinkler protection

Categories I and II

Categories III and IV

9000m2

1 000 sprinklers

2 000 sprinklers

TB229.3.8 BS EN Clause 13.4.4


LPC Rule requirement, amendment of fourth bullet point.

TB229.3.8 Minimum sprinkler discharge pressure

(Replacing BS EN Clause 13.4.4)

The pressure at the hydraulically most unfavourably situated sprinkler, when all the

sprinklers in the area of operation are in operation, shall be not less than that required to

achieve the density specified in 13.4.1 or the following, whichever is the higher:

0,70 bar in LH;

0,35 bar in OH;

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0,50 bar in HHP and HHS except for in-rack sprinklers;

2,00 bar for K80 in-rack sprinklers;

1,00 bar for K115 in-rack sprinklers.

TB229.3.9 BS EN Clause 9.3.5Description of change:

Clarification of Figure 4

Note. The drawings show the pipe end with a vortex inhibitor. Where a vortex inhibitor is

fitted depth measurements are taken from the underside of the upper flange. Horizontal

separation, from the wall is measured from the periphery of the vortex inhibitor to the

wall. When there is no vortex inhibitor depth measurements are taken from the lowest

edge of the pipe and horizontal separation from the wall is measured from the nearest

point on the pipe surface at the pipe end to the wall.

BS EN Clause 9.6.4, Figure 4, drawing 1 without sump.

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BS EN Clause 9.6.4 Figure 4, drawing 2 with sump

Where:

A - Minimum dimension from the suction pipe to the low water level

B - Minimum dimension from the suction pipe to the bottom of the sump

d - Nominal diameter of the suction pipe.

N - Normal water level

X Low water level

effective capacity

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TB229.3.10 BS EN Clause G.8.5


Re-instatement of minimum duration of foam additive

G.8.5 Foam additive

A suitable film forming foam, used in accordance with the supplier's

recommendation, shall be added to thesprinkler water.

NOTE In full scale fire tests, AFFF (aqueous film forming foam) has been shown to

be effective.

TB229.3.10 Minimum duration of foam additive supply.

(Replacing BS EN Annex G.8.5)

Aqueous film-forming foam (AFFF) shall be added to the sprinkler water in

accordance with the manufacturers recommendations. The duration of supply of

AFFF should not be less than 10min for a flow equivalent to 0.5Qmax

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