Nkọwapụta a bụ ịnye ọkọlọtọ nrụpụta maka usoro pipeline iji bufee mmiri, gas na mmanụ n'ime ụlọ ọrụ mmanụ na gas.
Enwere ọkwa nkọwapụta ngwaahịa abụọ, PSL 1 na PSL 2, PSL 2 nwere ihe achọrọ maka carbon dakọtara, ịdị ike notch, ike mkpụrụ kacha na ike tensile.