The Forcados pipeline, which transports 250,000 barrels per day, was first bombed in February and had just undergone reserves.
NDA also said it had hit the Brass to Tebidaba crude pipeline in the latest attacks to bring oil production and export to zero.
The militants made these claims on Twitter early Friday morning.
They tweeted: “At 3am today, NDAvengers blew up the SPDC forcados 48’ exportline.”
“We warned SPDC not to go ahead with repair works but they refused.”