Strainers are used in marine craft as coarse filters for incoming sea water for onboard use. These strainers are placed upstream of valves in order to prevent coarse material from fouling the valves. These are also used in the seawater cooling system to remove debris, which clog the pressure and flow control device (orifice) and/or the tubes of the heat exchanger. The two types of in-line seawater strainers most commonly used in weapons cooling systems are the simplex (single) and duplex (double) basket strainers.
Y type and T type strainers are named after their shape and normally used for course filtration. With large filtration area, it can be used with fine mesh also. Body of Y strainer is normally of cast iron or cast steel in various grades with flanged and socket weld type end connection. T strainer is fabricated from pipes & plates or standard equal T & flange. Filter elements are made of stainless steel perforated sheet or wire mesh supported by perforated sheet. In T type strainer, many times a structural skeleton made of flats and round bar is used to support the wire mesh. Low-pressure drop, compact size, robust design and ease of maintenance are some special features of these type strainers.
Stranded Bare Coppers is flexible and easily shaped, formed, welded and soldered. It is used in overhead transmission and distribution systems and for grounding grid systems. It has PVC or non-floating PVC outer jacket. It is suitable for use in CCTV monitoring, conduction and unidirectional control systems, including various high-frequency equipment and various A/V devices. Wire and cable is made with solid bare copper conductors which is not as flexible as made with stranded copper conductors. The decrease in flexibility is made up for with the reduced expense of solid bare copper alarm cable. Most low voltage alarm systems use a small gauge size wire and the small loss of cable flexibility.