According to local reports, the shipyard laid off dozens of employees this week and refused to pay severance, which has triggered the protest. The workers claimed they haven't been paid for several months.
The latest protest follows a worker strike at the shipyard in June 2016 for the same reason.
Huatai Heavy Industry was added into the latest batch of the shipyard white list by China's Ministry of Industry abd Information Technology (MIIT) in April this year.
The shipyard hasn't received any new orders this year, and currently has four vessels under contruction, made up of two 22,000 dwt tankers from TB Marine and two 38,500 dwt bulkers from Interlink.