The Alfa Laval SB Carlsberg Flask addresses the critical need for purity during initial yeast scaling. As an aseptic yeast culture flask, it functions as a self-contained environment for both the heat sterilization of wort and the subsequent multiplication of pure yeast cultures. The design eliminates the risks associated with transferring sterile media between separate vessels, as the entire propagation phase occurs within a single, secure unit.

How does the all-in-one aseptic design ensure yeast integrity?

The flask consists of a cylindrical container with a flat bottom and a top cover equipped with specialized components for aseptic operation. Breathing filters on the cover allow for essential gas exchange during aeration while preventing the entry of airborne contaminants. For product transfer and aeration control, a membrane sample valve is integrated into the assembly. Furthermore, the micro sample port allows laboratory technicians to introduce pure yeast cultures via a syringe, maintaining a closed system that never exposes the internal medium to the laboratory atmosphere.

What are the benefits of the Ra < 0.2 µm surface finish?

The internal surface finish is a critical factor in successful brewery yeast propagation. With a roughness of Ra < 0.2 µm (Ra < 32 μin), the product-wetted steel parts—made from EN 1.4307 (AISI 304L)—are exceptionally smooth. This level of finish prevents yeast cells or organic residues from adhering to the vessel walls, making the flask easier to clean and sterilize. Combined with product-wetted elastomers made from EPDM and silicone O-rings, the flask is fully compatible with the thermal loads of autoclaving and the biochemical requirements of wort processing.

Is the flask compliant with pressure equipment standards?

Security during sterilization and transfer is backed by compliance with PED 2014/68/EU. The flask is designed to handle a maximum operating pressure of 6 bar (87 psi), providing a significant safety margin for brewery laboratory applications. While the vessel is designed for high-temperature sterilization in an autoclave, its rated maximum operating temperature for standard process cycles is 20 °C (68 °F). This robust construction ensures that the flask remains a long-term asset in high-cadence laboratory environments.