PSI - Issue 72

Ivan Aranđelović et al. / Procedia Structural Integrity 72 (2025) 354 –361

358

2010 ÷ 4019 4020 ÷ 8038 8039 ÷ 16077 16078 ÷ 32154 32155 ÷ 64309

2.0 2.4 2.8 3.4 3.9 4.0

> 64310

Structure content combustion coefficient ( C ) is adopted from table 2, based on fire hazard class. The results for different types of fuels are summarized in table 3. Table 2. Structure content combustion coefficient ( C ) Fire hazard class VI V IV III II I Structure content combustion coefficient ( C ) 1,0 1.0 1.0 1.2 1.4 1.6

Table 3. Coefficient C for different types of fuels

Type of fuel

Gaseous Liquid Solid

Fire hazard class

I

II

III

Structure content combustion coefficient (C)

1.6

1.4

1.2

Since no combustible materials are built in the construction of the fire sector in which the boiler room is accommodated, it follows that the fixed specific fire load is Q i = 0 thus P k = 0. By EUROALARM standard tables for solid fuels P 0 =1. Qm for liquid fuels will be obtained by (1) and (2), which implies that P0 depends only on the installed boiler heating duty. For gaseous fuels will be accepted P 0 =1. If the width of the boiler room is less than 20 m, S =1, otherwise S =1.1. For the margin of safety in this paper the following values are adopted: S =1.1 (room width 20÷40 m) and R i =1 (minimal value for risk reduction coefficient). B equals to 1, because the boiler room is located at the ground floor and with area less than 3,000 m 2 , L equals to 1.1 because the nearest professional fire brigade is 5 km away. Since the installation of an automatic fire extinguishing system is not a technically acceptable solution, it is necessary to choose the coefficient W so that R 0 < 2. For solid fuels we obtained: 1,7 W 4∙B <2. (5) Hence 0,87 ∙ B