Method of making pressure vessels

Details Method of making pressure vessels Method of making pressure vessels

1998-10-16

2000-06-13

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Direct application of electrical or wave energy to work

Polymerizing, cross-linking, or curing

264 3616, 264 401, 264137, 156 64, 156169, 156172, 156173, 156175, 1562733, B29C 3508

Patent

active

060745959

ABSTRACT:
Methods for making tubular pressure vessels from polymer-impregnated fibrous material utilize cylindrical mandrels that are helically wound while rotating about a horizontal axis. After end closure fittings are installed on the mandrel, a barrier layer having a thickness of about 0.015 in is created by helically winding a strip of nonwoven polyester fiber material which is impregnated and coated with a mixture of two resin systems, one which is promptly cured by UV radiation while the other remains uncured. The resultant barrier layer is stable and drip-free and is inspected so minor defects can be remedied. A time lag of several hours before winding the major portion of the sidewall of the barrier layer subassembly is completely acceptable if an epoxy resin plus acid anhydride curing agent system is used having an extended pot-life of 12 to 15 hours. There can be stockpiling of mandrels carrying the stable barrier layers prior to transfer to a filament-winding apparatus where multiple passes are carried out to helically wind fiberglass tows from end to end atop the barrier layer. Thereafter, curing the epoxy resin system at a temperature of about 100.degree. C. for about 4-5 hours produces a structurally strong, defect-free pressure vessel having an integral sidewall.

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