PSI - Issue 48

Miroslav Gojić et al. / Procedia Structural Integrity 48 (2023) 334 – 341 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

340

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scenarios #3 and #6, which equal to 2.5 and 3.7 m, respectively.

Fig. 1. Criteria of dilution for hydrogen release at 100 bar

Fig. 2. Hazardous distances for hydrogen release at 50 and 100 bar, S =1 mm 2 , C

d =0.75 and k =0.5

Background concentration release rates are calculated from equation (6) and (7) for the scenario #1 assuming volume of industrial hall of V 0 =5,000 m 3 . Different ventilation air change rates per hour (ACH) are considered, such as standard industrial 5 ACH up to 30 ACH typical for explosive atmospheres ventilation. Also, the factor f which accounts for background concentration uniformity, assumed to be 1.5, 3 and 5 while X crit is adopted to be 0.25% of·LFL value. The results of background concentration calculations are presented in Table 2.