It was the 14th attack on the pipeline, which has not been operational since it was hit in March, they said.
There was no official report on damage from the latest attack but Petra, the official Jordanian news agency, said the impact of the blast was limited. No injuries were reported.
The explosion occurred in the al-Midan region near the north Sinai town of al-Arish, Lebanon's Daily Star reported.
On Saturday, Egypt increased its military presence in the Sinai in an effort to protect the pipeline, Haaretz said.
Salach al-Masri, commander of Egyptian security forces in the Sinai area, said a 150-member military and police force was deployed, the newspaper said.