Expansion Joints and Metal Hoses for Heavy Engines ... - BOA Group

Less vibration, more performance –BOA solutions for shipbuildingEnergy for the world –technology for LNG carriersBOA is particularly strong where Ships need to reducevibration. BOA Multilayer Expansion Joints are typicallyused in the engine manifold of ship engines (main engine,auxpac units, bow thruster) and in the Ship ExhaustSystem.Reliable engineering for reliable products. Our engineeringservices include:- Exhaust pipeline design analysis for properintegration of bellows and support brackets- Expansion Joint sketch sheet showing designconditions and materials- Bellows Design analysis including number andthickness of plies, resulting stress values, fatigue lifecycle, resulting stiffness values and bellows pressurethrust- Bellows frequency analysis for optimized numberof plies, thickness and bellows geometryProduct applications include:- Expansion joints for exhaust manifold andexhaust pipe- Expansion joints for pressure piping systems- Metal transfer hoses or “Dock Hoses” used totransfer cargo from the ship to the dockor special storage locationsHuge vessels with a total gross weight of up to 350.000tonnes are transporting liquefied natural gas across theoceans. These specific tankers carry up to 265.000 cubicmeters of gas at a temperature of –163 °C. ExpansionJoints type “SFZ” which are integrated in the gaspipelines on board have to fulfill most severe conditionsdue to high temperature differences between +50°Cand -163 °C and sometimes stormy weather conditionsincluding stresses in the body of the carrier and itsProduct applications:- Liquid line- Gas line- Gas Dome- Deck pieces- Punching devicespipelines. Our specific expansion joints type “SFZ” haveto survive 2.000.000 cycles under 10 bar working pressureand have to be fulfill highest safety requirementsof the IGC (International Gas Code) as well as InternationalMaritime Organization. The BOA Group is in thisdemanding business since 1972 and is supplier to allwell known Asian shipyards. Special bellows geometriesand forming processes have been invented in orderto fulfill highest product and market requirements.

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