船舶管路系统简介汇总.ppt

Pipe Design and Production Ship Piping Systems Bilge System Bilge System Basic requirement is to provide effective drainage to all dry spaces and at the same time prevent water from entering the spaces through this system. Discharge of oily water from machinery spaces is to comply with MARPOL Annex 1 Oily water is treated in an oily-water separator before being allowed to be discharged. Discharge water must be monitored with purity not to exceed ppm set by MARPOL. Bilge System Bilge main diameter, dm Bilge System Bilge pump capacity, Q Oily-water Separator Ballast System Ballast System For safe operation, at least two ballast pumps are to be connected to ballast tanks. Stripping eductor can also be used for emptying the bilges in cargo holds with 2 non-return valves between hold and system Ship side valve material must not of grey cast iron and to direct mechanical manual operate Air and Sounding Systems Purposes目的 to secure ventilation of tanks, cofferdam and tunnels to prevent over-pressurizing and vacuum (air pipes) 确保舱、围堰、管道通风，避免形成过压或真空（空气管） to ascertain the level of liquid in tanks, cofferdam and tunnels (Sounding pipes)确定舱、围堰、管道液位（测深管） Vent pipes need to prevent flooding of spaces through their upper ends通风管顶部末端要有 Vent pipes need to safely prevent flammable liquids or vapours due to their fire hazards Air and Sounding Systems Machinery Spaces Heavy fuel oil overflow tank has short self-closing type sounding pipe HFO overflow tank air pipe is led to open deck as required. Lubricating oil sump tank air pipe may end inside machinery space but away from ignition sources Air and Sounding Systems Machinery Spaces Air or overflow pipes internal are are normally required to be 1.25 times the area of respective filling pipes for a tank. Velocity in the air pipe is not to exceed 4 m/s when using one pump for one tank. Air and Sounding Systems Air and Sounding Systems Fire-Fighting Systems Fire-Fighting Systems Three groups: Fire Main Seawater as fire extinguishing