According to the company, SRUs are designed to address the specific needs of small capacity refineries and are based on a modular platform design.

The design is expected to reduce installation time and enable the units to meet the tight construction deadlines that have been imposed to complete the refinery by 2014-end.

The $300m Dakota Prairie refinery is set to process about 20,000 barrels per day (bpd) of oil and produce 7,000bpd of diesel fuel to address the needs of North Dakota.

Principal Technology president and CEO Matthew Hodson said fabricating modular components in a controlled environment in an off-site production shop will assure quality control as well as testing during the manufacturing phase.

"We will manufacture the SRUs while the refinery is under construction and ship the finished units to the facility for installation, which involves simply connecting the modules to the balance of plant services, commissioning and final testing, thus reducing on-site installation time by as much as 75 percent," Hodson added.

The Dakota Prairie refiner is a joint venture project of energy company MDU Resources and refining firm Calumet Specialty Products.