What is indicated by the 'duplex arrangement' of strainers in fuel oil systems?

The duplex arrangement of strainers in fuel oil systems is specifically designed to allow for maintenance without the need for a system shutdown. This setup typically consists of two strainers operating in parallel. When one strainer needs to be cleaned or serviced, the flow can be directed through the other strainer, ensuring that the system continues to operate without interruption. This is particularly important in fuel oil systems where continuous operation is crucial, as it minimizes downtime and maintains fuel supply stability.

In contrast, other options do not accurately represent the primary purpose of a duplex strainer arrangement. High pressure systems do not necessarily require a duplex arrangement; various designs can accommodate pressure needs. While heat exchange is an important function in many systems, strainers themselves do not facilitate heat exchange. Lastly, while duplex strainers can handle different oil viscosities, their main purpose revolves around enabling seamless maintenance, rather than managing varying oil characteristics.