... the cost of the running & maintenance.— Fire retardant, it meets IMOA.753(18) Level-3 fire resistance class. Specification:—Diameter:DN25~DN4000 ... of pipeline system of ocean engineering and ship, such as: fire protection water supply system, brine water supply pipeline, cooling water, potable ... , depth-measuring pipe, vent pipeline, water drainage pipe and cable protection pipe etc. FRP pipe