![]() ![]() The strainer assembly is so designed that in case a strainer gets chocked with impurities, the system can be put on the standby strainer till the time the chocked strainer is cleaned. Drop in suction pressure is an important signal for changing the strainer. When dirty, the strainer will produce low differential pressure across the pump. As the strainers are fitted in pairs, a change-over valve is provided at the top of the assembly to change the strainer when the one is use becomes dirty and chocked. If the pump is placed at a position where it tends to get suction problem, then the strainer is fitted on the discharge side. ![]() The strainers are always fitted on the suction side of the pump. The holes of the mesh screen is such that they filter all the large solid particles but allow the smaller ones to pass. The strainer assembly consists of a closely packed cylindrical arrangement of metal plates or wire coils, which is commonly known as mesh screen. Both, filters and strainers are mounted in pairs, with one as working and the other as standby. The main difference between a fuel filter and a fuel strainer assembly is that the latter is usually used to remove large solid contaminant particles while a filter is used for fine filtration. ![]() In fact a strainer is also a kind of a coarse filter used for separating solid particles of a different size. The process of removing solid particles from the fuel oil is known as mechanical separation, which is achieved by using filters and strainers. In order to ensure a clean supply of fuel oil, the oil should be free from any type of solid contaminants and impurities. The type of fuel oil used on a ship plays a vital role in determining the quality of combustion, efficiency of the engine and the amount and type of maintenance required. ![]()
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