| 摘要 |
A filament-wound tank portion of an electric water heater has a wall openi ng through which an electric heating element of other structure extends into th e interior of the tank. The opening is reinforced by a stacked series of singl e layer, open weave patch members which are interdigitated with layers of the filamen t winding and through which the opening extends. The filament winding and the patches are impregnated with and intersecured by a cured resin material. As an alternative to cutting portions of the patches during formation of the tank wall opening, the patches may be provided with suitable pre-formed openings with reinforced peripheries, the subsequently formed tank wall opening extending through these reinforced, pre-formed patch openings. The single layer, open weave patches are also utilized to reinforce other types of filament-based tank wall structures.
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