It is essential that the atmosphere in any confined space is tested and passed fit before entry. An atmosphere fit for working in is one that is breathable (i.e. has about 21% oxygen) and there are no toxic, flammable, or explosive gases or vapours present. It is also important that there is no enrichment of the atmosphere with inert gases or oxygen.
Evaluation of confined space atmospheres must include measurements for oxygen plus any other relevant gas.
Falls and Entrapment
Precautions to avoid trips and falls are basically common sense, vigilance and good housekeeping. Keep floors inside the space as dry, grease-free and free from obstructions as far as possible.
To reduce the risk of electric shock, it is recommended to locate electric welding power sources outside and ensure all cables entering the area are properly insulated.
Welders and others should make sure that they are insulated from the workpiece and grounded by dry insulation.
Radiation and Heat
Wherever possible use radiation and heat shields to prevent burns.
Take plenty of replacement fluid when working for lengthy periods in hot conditions to avoid dehydration and possible heat exhaustion.
Fire and Explosion
When using fuel gas processes extra care should be taken to ensure that the equipment is not leaking, as this can result in build-up of gas and possible explosion.
Oxygen should never be used to enrich the atmosphere in a confined space. It is a severe fire and explosion hazard.
Ni muhimu kwamba anga katika nafasi yoyote imefungwa ni majaribio na kupita fit kabla ya kuingia. An atmosphere fit for working in is one that is breathable (i.e. An atmosphere fit for working in is one that is breathable) An atmosphere fit for working in is one that is breathable (i.e. An atmosphere fit for working in) An atmosphere fit for working in is one that is breathable (i.e. An atmosphere fit for working in) Inapaswa kuwa na oksijeni ya 21% na hakuna gesi au mvuke wa sumu, wa kuwaka moto au wa kulipuka. Pia ni muhimu kwamba hakuna utajiri wa angahewa na gesi inert au oksijeni. Tathmini ya anga za nafasi zilizofungwa lazima ni pamoja na vipimo kwa oksijeni pamoja na gesi nyingine yoyote muhimu. Kuanguka na kuingiliwa Hatua za tahadhari za kuepuka kuanguka na kuanguka ni kimsingi akili ya kawaida, tahadhari na usimamizi mzuri wa nyumba. Weka sakafu ndani ya nafasi kavu, bila mafuta na bila vizuizi kadiri iwezekanavyo. Ili kupunguza hatari ya mshtuko wa umeme, ni inashauriwa kupata umeme kulehemu vyanzo vya umeme nje na kuhakikisha nyaya zote kuingia eneo ni vizuri insulated. Welders na wengine wanapaswa kuhakikisha kwamba wao ni insulated kutoka workpiece na grounded na insulation kavu. Mionzi na Joto Kila inapokuwa na uwezekano tumia miilolinda ya mnururisho na joto ili kuzuia kuchomwa. Chukua kiasi kikubwa cha kioevu cha badala wakati wa kufanya kazi kwa muda mrefu katika hali ya joto ili kuepuka dehydration na uwezekano wa uchovu wa joto. Moto na Mlipuko: Wakati wa kutumia mchakato wa gesi ya mafuta, tahadhari ya ziada inapaswa kuchukuliwa ili kuhakikisha kwamba vifaa havina uvujaji, kwani hii inaweza kusababisha kuongezeka kwa gesi na uwezekano wa mlipuko. Oksijeni haipaswi kamwe kutumiwa kutajirisha angahewa katika nafasi ndogo. Ni hatari kubwa ya moto na mlipuko.