Abstract: Methods and a double vacuum processing system are presented. A method of performing a double vacuum debulk and cure on a composite laminate is presented. A composite laminate is heated to begin a double vacuum debulk of the composite laminate while vacuum is pulled in a first vacuum zone containing the composite laminate and a second vacuum zone containing the first vacuum zone. Pressure within the second vacuum zone is increased to above atmospheric pressure. Heating the composite laminate is continued to complete a cure cycle for the composite laminate while the second vacuum zone is above atmospheric pressure.

Abstract: A high pressure ring seal for tube assembly joints provides structural foundation ring having inside and outside circumferential channels between end rims. The channels and rims are separated by a web of integral ring material. This web is perforated by a plurality of apertures. As an integral coating within both channels and integrally tied through the web apertures is a coating of polymer sealant material. Inside and outside faces of the sealant are pressure equalized by vent apertures through the web apertures.

Abstract: A high pressure ring seal for tube assembly joints provides structural foundation ring having inside and outside circumferential channels between end rims. The channels and rims are separated by a web of integral ring material. This web is perforated by a plurality of apertures. As an integral coating within both channels and integrally tied through the web apertures is a coating of polymer sealant material. Inside and outside faces of the sealant are pressure equalized by vent apertures through the web apertures.