Finnish ship systems and technology giant Wartsila is expecting a "really silent" first half for newbuilding orders, but its scrubber business is still ticking over at lower levels.

Retrofits of the exhaust cleaning systems were badly hit by coronavirus lockdowns in China in February and March, but activity is now returning to normal, the company said.

Tamara de Gruyter, president of Wartsila's marine systems business, told TradeWinds the company is still able to manufacture scrubbers.