Photo: Illustration purposes only (Image courtesy of Höegh LNG)

DNV GL updates class rules with revised regasification section

DNV GL updates class rules with revised regasification section
Illustration purposes only (Image courtesy of Höegh LNG)

Classification society DNV GL overhauled its class rules, including the regasification section, to include the technical and market knowledge acquired in the FSRU sector. 

“Floating storage and regasification units (FSRUs) are a relatively young and highly dynamic industry segment with a steep learning curve,” DNV GL said in a statement.

When redrafting its regasification rules DNV GL relied on the in-house knowledge and experience but also on feedback from key users, designers, shipyards and shipowners.

Naturally, the IGC Code forms the basis of the safety requirements, but the updated DNV GL class rules go incorporating criteria derived from practical experience.

The basic Regas rules comprise all requirements to ensure safe operation, and a line-up of optional class notations further enhance safety levels on board.

Mónica Paola Alvarez Cardozo, senior engineer, LNG, cargo handling & piping systems said, “our clearly-defined set of basic rules and the add-on Enhanced Safety (ES) qualifier make it easier for shipyards to build to our class.”  

She adds that major Korean yards were instrumental in the rule development process.

The updated rules open up the possibility of fitting regasification plants on board non-LNG carriers ship types on a case-by-case basis. Furthermore, the updated regasification rules now reflect DNV GL’s established practice with earlier regasification vessels, e.g. regarding the strength of the regasification module skid or the use of high-integrity pressure protection systems (HIPPS).

One of the changes relates to FSRU drydocking Alvarez Cardozo said, adding that ships are normally required to dry-dock every five years.

“Our new class notation UWILD (Underwater Inspection in Lieu of Dry-docking) allows an FSRU to remain at a stationary location for as long as desired, subject to flag state approval,”  she said.

Required inspections will be done as before, however, they will be carried out differently, using underwater techniques were applicable, and on a case-by-case basis.

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