Outward-Opening Rectangular Manway with Twin Closure Arms

An outward-opening rounded-rectangular stainless steel manway featuring twin parallel bracket arms, a spring-assisted rear hinge bar, and two swing-bolt top nuts. Listed in 304 or 316L across five drawing sizes from 435×335 to 435×535.

Connection	Butt-weld rectangular neck frame
Material options	304 or 316L frame and cover; silicone gasket; 304 bracket arms, springs, and hardware
Closure structure	Outward-opening rectangular cover with twin parallel bracket arms, 2 hinge springs, and 2 swing-bolt top nuts
Shape	Rectangular with rounded corners
Size range	435×335 / 411×535 / 431×535 / 415×535 / 435×535 (drawing Size)

Size

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Twin Closure Arms and Spring-Assisted Rear Hinge

The rounded-rectangular cover is carried by two parallel closure bars pinned across two cover supports on the lid exterior. At the hinge side, a rear hinge support bar with two coil springs and a long hinge rod connects to the frame lugs, while the opposite side clamps shut with two swing bolts and two double-eared top nuts.

Parts List Materials and Gasket Seating

The weld-in rectangular frame and cover are available in 304 or 316L stainless steel with a molded silicone perimeter gasket. All closure hardware in the 14-item parts list—including the bracket assembly, top nuts, swing bolts, hinge supports, cover supports, springs, bolts, and nuts—is specified in 304 stainless steel.

Drawing Sizes and Heavy Frame Wall Options

Five rectangular configurations are listed in the dimensional drawing: 435×335, 411×535, 431×535, 415×535, and 435×535, all with an 80 mm standard collar height. Because several sizes share similar internal opening dimensions while offering either 8 mm or 10 mm frame wall thickness, select using the complete row in the dimensional table rather than nominal size alone.

Side-Wall Installation and Selection Checks

This rectangular manway is commonly installed on the side of large tanks and containers. Before ordering, confirm the required frame wall thickness (8 vs 10), internal L1×L2 opening dimensions, and whether the cover is supplied plain or with a central boss.