A na-eji ya eme ihe na petrochemical, ụlọ ọrụ ọkụ, osisi mmiri, ụlọ ọrụ na-ahụ maka nsị mmiri, injinia ime obodo, injinia ịdị ọcha na mpaghara ndị ọzọ nke nyiwe, ụzọ ụkwụ, àkwà mmiri trestle, mkpuchi trenchi, mkpuchi oghere, ubube, fences, nchebe, wdg.