| 摘要 |
A viewport assembly having a tubular member, such as a ullage tube, with an internal cylindrical surface, a frame ring with an outer and an inner circumferential surface, the outer surface being defined in part by an outwardly radially extending flange portion and the frame ring having a plurality of spaced apart bolt holes therethrough, a gland ring having an integral forwardly extending tubular portion, the tubular portion being telescopically receivable on the frame ring outer circumferential surface rearwardly of the flange portion and providing an annular area externally of the frame ring between the frame ring flange and the gland ring tubular portion forward end, a transparent window disc sealably received within the frame ring, and a bolt for each of the bolt holes in the frame ring threadably engaging matching threaded bolt holes in the gland ring so that as the bolts are tightened the gland ring is drawn onto the frame ring, compressing the packing ring to expand it outwardly into sealing engagement with the tubular member internal cylindrical surface.
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