Paper on working in DSD manholes underground
Paper on working in DSD manholes underground
Abstract
Underground manhole has many sewage accumulating there, can generate poisonous gas, H2S, flammable, and can explode, also insufficient O2, cause suffocation of workers inside manhole. In HK, for workers working in confined space, they must have received confined space training, then become Competent Person, authorized to work in confined space. This paper is to illustrate the safety precautions needed for workers to work in confined space.