NFPA 13 vs EN 12845

COMPARISON OF STANDARDS NFPA 13 and EN 12845 Hazard Classification of Building Sprinkler systems to control and to extinguish the fire, the intensity of a predetermined minimum application temperature of the protected area is designed to discharge. The most important criteria for the design of the sprinkler system, the design density and area of operation. Design criteria for determining the hazard class is primarily determined by Referancing protected. EN 12845 standard is exactly the same as a fire hazard classes of the Regulation. However, when compared with the standard of NFPA 13, the same between the two standards for areas where significant differences observed. This is a direct effect on the fire pumps and water storage capacity is the most important factor in increasing infrastructure costs. Major differences between the two standardpn hazard classes set given in Table 1. Use Class

EN12845

NFPA -13

Houses

Offsite

low Hazard

Hotels

Medium Hazard Group 1

low Hazard

Parking Lots



schools


low Hazard

Hospitals


low Hazard

Office Buildings


low Hazard

shopping center



Restaurants


low Hazard

Museums


low Hazard

Cinema and theater


low Hazard

Libraries


low hazard

Utility Rooms

Medium Hazard Group 3 Medium Hazard Group 2 Table 1 Comparison of Hazard Classes

Hydraulic Design Criteria The purpose of a sprinkler system, power calculation method, the system for the transfer of sufficient water and the pressure needed to determine the pipe diameter. Evaluation is made in terms of hydraulic calculations are itemized below are the major differences between the two standards. • EN12845 residential sprinklers are not covered. For this reason, the current values in the following table where residential sprinklers can not be used. NFPA 13 ' NFPA13 Article 11.1.5.6, there is shown the operation area of residential sprinkler calculations made by selecting the area where the sprinkler 4 should be a need for a great power. A need for large hydraulic flow to the sprinkler 4, the minimum area of operations 4.1 ( mm / min) should ensure that the design density. • Storage areas, there is scope for the specific sprinkler types EN 12845, ESFR, coarse droplets, Control Mode warehouse -type and so on. sprinkler hydraulic design criteria, however, be determined according to NFPA13. • Fast-acting sprinkler hydraulic calculation criteria on the use of EN12845 despite the lack of change in the height of NFPA 13, Referancing quick response sprinkler protected, depending on the correction curve for the reduction of up to 40 % of the area of operation is located. • Dry -pipe systems, the EN12845 value defining a separate area of operation, NFPA13 wet pipe sprinkler system increased by 30% from the value of the account would like to apply the operational area. • In addition to the critical area of EN12845 power, power must be held account for the most favorable terms. However, no such requirement for NFPA 13. The purpose of this account is the pump, the hydraulic pressure in the flow chart of the area that requires a lot of water flow and pressure to meet. • Account has been given the power curve NFPA13'te design criteria, the standard of EN 12845 are given in the table. The biggest difference in the delivery of the host of the curve, values at any point on the curve is given in Figure 1 katılabilirken account, EN12845 standard is based on a single value.

Fire Zones Determining fire zones, building design architecture, taking into account the size of the zone is next to the fire. For wet pipe sprinkler systems for both standard zone size comparison chart below. hazard Class

EN 12845 (Table 17 )

NFPA -13 (see 8.2.1 )

low Hazard

10 000 m²

4831 m²

12 000 m² ( Except as permitted in Annex E and D )

4831 m²

9 000 m²

3716 m²

Medium Hazard High Hazard

Table 3 - Wet Pipe Systems Zone Size • • • • • • • •

The biggest difference between the two standard, EN 12845 limit value for each alarm zone valve on the size of the total area protected by the installation to determine where, despite the NFPA13 valve connected to the alarm limit for the largest floor space value. EN 12845 on the individual circumstances to determine zoning moderate hazard class neighborhoods, despite the size of the zone of NFPA 13, the conditions on the class of hazard does not. 1000 shall not exceed the number of sprinklers on each floor, fed by the same alarm valve. Parking lots and storage areas should be designed as a separate zone. Each alarm 10000, not to exceed the number of sprinkler valve design should be fed. Each zone should be no more than 500 pieces of design sprinklers to be discovered. Medium hazard -3 zoning in the area over the space of hazard class should not have. ( For example, theater, conference hall, etc.). EN12845 separated by zones of sprinkler alarm valve installation kit, shut-off valve and by-pass valve should be two. ( Figure D.1 )

Figure 2- Wet alarm valve By-pass Access (EN 12845 : Figure D.1) Water Feeds Minimum water supply, water demand, sprinkler system, fire hydrant system, storage, and water supply systems are required to be specified by the hose. a. Sprinkler water supply, power on the basis of criteria in determining the values given by the regulations below must be added to the water supply hose. The values given in Table 4, Table 11.3.1.2 NFPA13 is close to the values given in EN12845 water supply, each system must simultaneously can provide a maximum of the sum of the calculated flow rates and flow rates to the required pressure for the system, which needs a lot of water should be corrected states. ( 9.6.4.b )

Building Hazard Class

to be added to Fire Cabinet Flow (l/min)

to be added to hydrant Flow (l/min)

time (min)

low hazard

100

400

30

Medium Hazard -1

100

400

60

Medium Hazard -2- 3-4

100

1000

60

High Hazard

200

1500

90

Table 4 - Additional Water Needs for Fire Hose and Hydrant System ( Regulation Annex- 8 / C ) b. Firefighter, intake of water as well as on the need for both regulation and does not have any information on EN12845. According to NFPA 14 fire engines, intake column system ( standpipe ) is determined by the flow of water needed to. At the same time according to NFPA 13, sprinklers and fire columns unified system for serving water intake valves, sprinkler water demand, is added to the water supply hose. NFPA13 and compared with each other according to claim 14 the two values, the higher value is used. ( NFPA13 Article 11.1.5.6 ) In other words, the need for the hose to water supplies, hydrants and fire hose cabinet system is to determine the combined column on the system 2 ½ "hose connections to the water supply is controlled by NFPA14. NFPA14 according to this value is greater than the amount required by the regulated water supply. number of columns

Firefighting Water Intake Diameter 2.1/2 " The top design point min. pressure (bar)

flow (l/min)

1

6

1893

2

6

1893+946

≥3

6

3785

Table 5 - Fire Water Intake Water Requirement c. Firefighter, intake valve connections should be made directly through the main speakers. If the sprinkler system to EN 12845 does not allow connections to other systems. NFPA fire column 13, intake connection of the coupled system, as shown in Figure 2, in case of introduction of each check valve permits the inlet zone coat.

Figure 3 System Column in the United Pipe Arrangement ( NFPA13 : 2007 Figure A.8.17.5.2.2.a ) d. According to the regulation, the first 4 -bar pressure hose systems are required. EN12845 standard does not define pressure. However, NFPA 13, can provide sprinkler system pressure ( pressure at the point where the sprinkler system, hose connection ), 1 ½ " hose connection at least 50 GPM ( 189 lpm ) defines flow. Regulation, the pressure value at the joint provision of sprinkler system in case of fire cabinets, sprinkler system increases the high amount of pressure and flow rate.

Piping According to the regulation, the first and second seismic zones, seismic movements pulled over in any direction against the main columns to support the use of four-way and a nominal diameter of 65 mm and larger pipes, pipes, ceilings and floors with links to the main distribution pipe to fasten a flexible two-way connection of the transverse and longitudinal Breaking fixing pipes using hangers should be avoided. Meet the transition movement in all three directions are detailed dilatation. NFPA 13, seismic details are given in detail in the relevant regulations. However, EN12845 standard measures to protect against earthquakes, fire installation are not included in the issue. Result After this assessment of the structure and the fact that many EN 12845 type of application is not able to meet the identified issues and the scope of EN 12845 should use, but we can not rule out that due to lack of NFPA13 and other NFPA documents, and we will continue to use emerging.

NFPA 13 vs EN 12845

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