Single-Arm Round Manway with Ribbed Cover

A round tank-top manway with a radially ribbed cover, one closure arm and a single handwheel. The cover carries the sealing ring; the exact drawing lists 400, 450 and 500 mm sizes with 304/316L frame and cover options.

Frame and cover options	304 / 316L stainless steel
Tank connection	Welding; tank-top installation
Cover and seal	Radially ribbed round cover; cover-mounted seal
Closure	Single arm and one handwheel
Drawing sizes	400 / 450 / 500 mm

Size

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Ribbed cover and single closure arm

The round cover has radial ribs visible across its surface, while one straight arm spans the opening and pairs with a single handwheel. This combination distinguishes the manway from a plain-cover central-handwheel design and from covers with several perimeter closures. Use the cover and arm arrangement when identifying replacement components.

A sealing ring carried by the cover

The sealing ring is mounted on the cover, and the illustrated parts list identifies a silicone gasket. The frame and cover list 304 or 316L options; other closure parts are separately identified in the parts list. Match the seal profile and its mounting location when selecting a replacement ring.

Three exact drawing sizes

The drawing covers 400, 450 and 500 mm sizes. Its listed collar height H is 100 mm, with t of 2 mm and t1 of 1.5 mm for those rows. Use the labelled views to distinguish collar and cover dimensions when checking the tank interface and selecting replacement parts.

Tank-top layout and routine access

This design is restricted to the top of the tank in its product description. Plan the welded interface and nearby pipework with clearance for the arm, handwheel and cover movement. Routine attention should include the cover-mounted gasket and visible closure components, keeping access available for inspection and replacement.