query on air compressor outlet pipe &Safety

hiii Good evening i have 400 cfm compressor (Diesel operated screw Compressor), having 2" outlet-01 No,3/4" outlet -03 nos, in this i want to use 3/4" --01 no for my work,so here what type of pipe and latch to be use and how to calculate the same need to use 100 mtr. and please share me the safety tips also. Thanking you sir, Regards Sankar.