Ụkpụrụ nchekwa
Nchekwa ụmụaka bụ isi ihe achọrọ maka ogige ntụrụndụ ime ụlọ, ọ bụkwa ọrụ anyị imepụta na imepụta ogige ntụrụndụ dabara ụkpụrụ ndị a.
Na Europe na United States na mpaghara ndị ọzọ mepere emepe, n'ihi mkpa nchekwa ime ụlọ na afọ ndị tozuru okè gburugburu ebe obibi, ya mere, n'ime ime ụlọ nwere usoro na ụkpụrụ nchekwa zuru oke, ejirila nwayọọ nwayọọ nabata dị ka ụkpụrụ nchekwa mba ụwa.
Ebe egwuregwu ime ụlọ nke shei oké osimiri wuru dabara nke ọma n'ụkpụrụ nchekwa nchekwa ụwa dị ka EN1176 na AmericanASTM, ma gafere AmericanASTM 1918, EN1176yana ule asambodo nchekwa AS4685.Ụkpụrụ nchekwa mba ụwa anyị na-agbaso na imewe na mmepụta gụnyere:
United States ASTM F1918-12
ASTM F1918-12 bụ ọkọlọtọ nchekwa izizi emebere maka ebe egwuregwu ime ụlọ ma bụrụ otu n'ime ụkpụrụ nchekwa mba ụwa nabatara maka egwuregwu ime ụlọ.
Ihe niile eji eme ihe na seasell agafeela ọkọlọtọ ASTM F963-17 maka nnwale ọkụ na nke anaghị egbu egbu, yana ogige egwuregwu niile anyị rụnyere na North America agafeela ule nchekwa na ọkụ mpaghara.Na mgbakwunye, anyị agafeela ọkọlọtọ ASTM F1918-12 na ọkọlọtọ nchekwa nhazi, nke na-eme ka ogige gị nwee ike ịgafe ule nchekwa mpaghara ma ọ dị mkpa ma ọ bụ na ọ bụghị.
European Union EN 1176
EN 1176 bụ ọkọlọtọ nchekwa maka ime ụlọ na n'èzí egwuregwu na Europe ma nabata ya dị ka ọkọlọtọ nchekwa izugbe, n'agbanyeghị na ọnweghị oke na nchekwa ime ụlọ dịka ọ dị na astm1918-12.
Ihe anyị niile agafeela ule ọkọlọtọ EN1176.Na Netherlands na Norway, ogige egwuregwu anyị maka ndị ahịa anyị agabigala ule ime ụlọ siri ike.
Australia AS 3533 & AS 4685
As3533 & AS4685 bụ ọkọlọtọ ọzọ emepụtara maka nchekwa egwuregwu ime ụlọ.Anyị emewokwa ọmụmụ ihe zuru oke na ọkọlọtọ nchekwa a.Ihe niile agafeela ule ahụ, a na-ejikọta ụkpụrụ niile na nhazi na mmepụta mmepụta.