This officially released SIGTTO publication is intended to provide required guidance to the cargo strainer installations on board tankers carrying LPG cargoes. For many years, these strainers have not been in use since until now they have not been considered necessary equipment.
The reason for that was that the LNG cargo used to be treated as the "clean" one with the filtration commonly limited to the strainers fitted in the loading line at the time of the new construction, i.e. at the shipyard. The contamination on board the vessel was provided by good housekeeping combined with the regular visual checks during the installation and commissioning of the line, together with the post-delivery inspections at regular intervals.
However, the installation of the strainers is now a requirement to be complied with, noting the significant role they can play in preventing the pollution and maintaining the clean transfer of cargo - this is one of the most important parts of the process that is a key element in preventing damage to the terminal equipment as well as any serious contamination.
This document will provide readers with the recommendations that have been developed on the basis of the practical experience related to the different types of strainers, their location and performance..