The testing is expected to commence in late summer. By filling the Ormen Lange pipeline with gas from Sleipner, field operator Norsk Hydro ASA will be able to conduct some testing of the pipeline's other field infrastructure at Ormen Lange before the field goes into production, Gassco spokesman Kjell Varlo Larsen said. A spokesman for Royal Dutch Shell, who will operate the Ormen Lange field once production begins, said the date of first production from the field is yet to be confirmed.