![]() ![]() ![]() We believe that 0.6mm sheet offers a reasonable compromise between cost, weight & strength. Matrix Applied Technologies uses 0.6mm (0.024”) sheet as standard, with other thicknesses available on application. Frequently we have found that damage to thin sheeting has occurred when workmen have been working on the IFR. Sheeting can corrode over the years depending on ambient air moisture levels. Experience shows that this is still too thin. This was recently increased to a minimum of 0.51mm (0.020”). Costly and time consuming activity.ĪPI 650 Appendix H used to specify a minimum deck sheeting thickness of 0.46mm (0.018”). Maintenance activities such as internal tank inspections become complicated because they don’t support the weight of the inspectors walking on the deck leading to the need to fit scaffolding which involves removing part of the deck skin. The decks are also very flexible which can cause fatigue in the pontoons potentially leading to sinking. The cheap lightweight internal floating roof wiper seals give normally 3-5 years of service life which undermines the requirement to fit a roof in the first place with excessive vapour emissions. Aggressive cycle frequency puts more strain on the floating roof, particularly at the rim, so the floating roof must be designed to withstand these loads through its life cycle. The cycle frequency (the inlet/outlet rates of the tank) is a very important key with respect to aluminium internal floating roofs.
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