Removable jackets on large vessels
Salt spray, alternating temperatures and continuous duty: marine insulation has to hold its thermal performance while staying removable.
Large vessels run through wide temperature swings in salt-laden air, which puts demands on the temperature range, conductivity, flame class and corrosion resistance of a jacket. Marine jackets are specified against GB/T 17357 for insulation design, GB 8624 for flame class and the general requirements for offshore thermal protection.
Typical marine jackets use low-conductivity cores, with conductivity around 0.12 W/(m K) or lower for the standard grades. That is enough to hold equipment at its working temperature through continuous operation and to cut the radiative and convective losses that otherwise heat the engine room.
Where they go
Exhaust manifolds and pipework, turbocharger housings, steam and hot water lines, valves and flanges, galley and accommodation heating equipment. In each case the jacket has to be removable for survey, which is why the fastening detail and the marking matter as much as the insulation.
Reference note. Figures and standard references are indicative and do not replace the project specification, the current edition of the standard, or product test reports for the specific supply.