Single-Arm Round Manway with Offset Sight Glass
An outward-opening round stainless steel manway featuring a central cross-arm closure bracket, a single swing-bolt handwheel, and an offset bolted sight glass port. Listed in 304 or 316L across six drawing sizes from 350 to 600.
Connection | Butt-weld round neck collar |
|---|---|
Material options | 304 or 316L frame, cover, and bracket; silicone gasket; 304 hardware with 304/ABS handwheel |
Closure structure | Outward-opening cover with single cross-arm bracket, 1 swing-bolt handwheel, and offset sight glass (DN50–DN100) |
Shape | Round |
Size range | 350 / 400 / 430 / 450 / 500 / 600 (drawing Size) |
Size
Product overview
Single Cross-Arm Closure and Offset Viewing Port
An arched closure bracket spans across the center of the round cover from the rear hinge support to a front swing bolt and single handwheel, pivoting on a central upper hinge lug welded to the lid. Because the bracket occupies the diameter centerline, the flanged circular sight glass is positioned on one side of the cover.
Parts List Materials and Sealing
The drawing parts list specifies 304 or 316L stainless steel for the cylindrical frame, cover, and overhead bracket, with a silicone perimeter gasket, a 304 or ABS handwheel, and 304 stainless steel for the swing bolt, hinge supports, pin, lock ring, and sight glass flange. Series specifications also note EPDM, FKM, and NBR seal options.
Drawing Sizes and Sight Glass Pairing
Six nominal sizes are tabulated—350, 400, 430, 450, 500, and 600—each with a matching outer diameter (350 to 600), a 100 collar height, a 3 collar wall thickness, and a 2.5 cover thickness. The offset sight glass is sized at DN50 for size 350, DN80 for sizes 400 to 450, and DN100 for sizes 500 and 600.
Top-of-Tank Installation and Selection
This assembly is intended for top installation on non-pressure vessels. When specifying, confirm overhead clearance for the hinged bracket and cover arc, and verify the viewing glass lens material and custom collar height or thickness requirements.
Technical specifications
Product specifications
- Glass material
- Tempered Glass
- Seal material options
- Silicone, EPDM, Viton, NBR
Dimensional reference · JOF-MHR001-SG Dimensions
Single-Arm Manway with Offset Viewing Port: listed sizes and matching drawing symbols.
| Size | OD | H | t | t1 | Sight Glass |
|---|---|---|---|---|---|
| 350 | 350 | 100 | 3 | 2.5 | DN50 |
| 400 | 400 | 100 | 3 | 2.5 | DN80 |
| 430 | 430 | 100 | 3 | 2.5 | DN80 |
| 450 | 450 | 100 | 3 | 2.5 | DN80 |
| 500 | 500 | 100 | 3 | 2.5 | DN100 |
| 600 | 600 | 100 | 3 | 2.5 | DN100 |
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