WÃƒÂ¤rtsilÃƒÂ¤ 32 Product Guide

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Wärtsilä 32 - Product Guide 4. Description of the Engine 4.4 Overhaul intervals and expected life times The following overhaul intervals and lifetimes are for guidance only. Actual figures will be different depending on service conditions. Expected component lifetimes have been adjusted to match overhaul intervals. In this list HFO is based on HFO2 specification stated in the chapter Fuel Oil System. Table 4.1 Time between overhauls and expected component lifetimes. Piston Piston rings Cylinder liner Cylinder head Inlet valve Exhaust valve Injection valve nozzle Injection pump Injection pump element Main bearing Big end bearing HFO 12000 - 20000 12000 - 20000 12000 - 20000 12000 - 20000 12000 - 20000 12000 - 20000 2000 12000 24000 - 32000 12000 - 20000 Time between overhauls (h) MDF 20000 - 24000 20000 - 24000 20000 - 24000 20000 - 24000 20000 - 24000 20000 - 24000 2000 12000 24000 - 32000 20000 - 24000 HFO MDF Expected component lifetimes (h) 48000 - 60000 12000 - 20000 60000 - 100000 60000 - 100000 36000 - 40000 20000 - 32000 4000 - 6000 24000 48000 24000 - 32000 60000 - 100000 20000 - 24000 > 100000 > 100000 40000 - 48000 20000 - 40000 4000 - 6000 24000 48000 24000 - 32000 32 Product Guide W32 - 1/2013
Wärtsilä 32 - Product Guide 5. Piping Design, Treatment and Installation 5. Piping Design, Treatment and Installation This chapter provides general guidelines for the design, construction and planning of piping systems, however, not excluding other solutions of at least equal standard. Installation related instructions are included in the project specific instructions delivered for each installation. Fuel, lubricating oil, fresh water and compressed air piping is usually made in seamless carbon steel (DIN 2448) and seamless precision tubes in carbon or stainless steel (DIN 2391), exhaust gas piping in welded pipes of corten or carbon steel (DIN 2458). Sea-water piping should be in Cunifer or hot dip galvanized steel. NOTE! The pipes in the freshwater side of the cooling water system must not be galvanized! Attention must be paid to fire risk aspects. Fuel supply and return lines shall be designed so that they can be fitted without tension. Flexible hoses must have an approval from the classification society. If flexible hoses are used in the compressed air system, a purge valve shall be fitted in front of the hose(s). It is recommended to make a fitting order plan prior to construction. The following aspects shall be taken into consideration: • Pockets shall be avoided. When not possible, drain plugs and air vents shall be installed • Leak fuel drain pipes shall have continuous slope • Vent pipes shall be continuously rising • Flanged connections shall be used, cutting ring joints for precision tubes Maintenance access and dismounting space of valves, coolers and other devices shall be taken into consideration. Flange connections and other joints shall be located so that dismounting of the equipment can be made with reasonable effort. 5.1 Pipe dimensions When selecting the pipe dimensions, take into account: • The pipe material and its resistance to corrosion/erosion. • Allowed pressure loss in the circuit vs delivery head of the pump. • Required net positive suction head (NPSH) for pumps (suction lines). • In small pipe sizes the max acceptable velocity is usually somewhat lower than in large pipes of equal length. • The flow velocity should not be below 1 m/s in sea water piping due to increased risk of fouling and pitting. • In open circuits the velocity in the suction pipe is typically about 2/3 of the velocity in the delivery pipe. Product Guide W32 - 1/2013 33
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WÃƒÂ¤rtsilÃƒÂ¤ 32 Product Guide

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