О`zbekiston respublikasi oliy va o`rta maxsus ta`lim vazirligi andijon mashinasozlik instituti transport va logistika fakulteti «hayot faoliyati xavfsizligi»

YEAS o‘z o‘rnida uch guruhga bo‘linadi:
§ aloxida xavfli YEAS - chaqnash harorti yopiq tigelda -180S, ochiq tigelda -130S va undan kichik bo‘lgan;
§ doimiy xavfli YEAS - chaqnash harorti yopiq tigelda -180dan +230 Sgacha, ochiq tigelda -130dan +270S bo‘lgan;
§ harorat ko‘tarilganda xavfli YEAS – bularga chaqnash harorti yopiq tigelda +230dan +610 Sgacha, ochiq tigelda +270dan +660S bo‘lgan.
Yengil alangalanuvchi suyuqliklarga quyidagilar kiradi:
 benzin (-44 dan -17 oS gacha)
 benzol (-12 oS)
 metilviy spirt (8 oS)
 etiloviy spirt (13 oS)
 traktor kerosini (4-8 oS) va boshqalari.
Yonuvchi suyuqliklarga quyidagilar kiradi:
 tiniqlashtirilgan kerosin (48-50 oS)
 vazelin moyi (135 oS)
 transformator moyi (160 oS)
 mashina moyi (170 oS) va boshqalar.
Alangalanish harorati deb suyuqlikning minimal haroratdagi chaqnash hodisasi suyuqlikdan yetarli darajada bug‘lar ajralib chiqishini ta’minlashi natijasida alangalanish davom etadigan holatiga aytiladi. Yengil alangalanuvchi suyuqliklar uchun bu harorat chaqnash haroratidan 1 - 5°C yuqoriroq bo‘ladi, yonuvchi suyuq¬liklar uchun esa 30 - 35 °C ga borishi mumkin.


Nazorat uchun savolar.
1. Yonish turlari qanday aniqlanadi.
2. Yonish jarayoniga gaz oqimining turbulentligi qayeday ta’sir ko‘rsatadi.
3. Qattiq materillarning yonish jarayonida miqdoriy tavsifi sifatida qaysi ko‘rsatkich qo‘llaniladi.
4. Kritik sharoit nima bilan aniqlanadi.
5. Chaqnash harorati nima.


Bajarilgan ishlar xaqidagi xulosa.
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