Elliptical Yoke & Bolt Manways

Nalco Pretreatment Solutions (PTS) supplies elliptical yoke and bolt manways for personnel access to pressure vessels. We offer two sizes of these complete manhole assemblies or tank manhole covers, which can be used for industrial and commercial water treatment applications.

Elliptical yoke and bolt manways provide reliable, low cost access to pressure vessels. Elliptical manway covers and rings are manufactured in accordance with ASME code specifications. Standard manways have a pressure rating of 300 pounds. Our standard elliptical manway covers in two sizes 11" x 15" and 12" x 16".

A complete manway/manhole assembly consists of:

• Elliptical carbon steel ring in depths of 3”, 4”, or 6” with a thickness of 3/4” or 1” depending on size.
• Pressed steel manway cover
• One or two steel yokes (depending on type) with nuts and bolts
• The standard gasket supplied is black neoprene (60-70 Shore)
• Custom sizes, stainless steel and various gasket materials (Buna-S, high temperature neoprene, and expandable Teflon foam) are available upon request

A complete top assembly or cover assembly can be supplied for existing installations and consists of:

• Manway cover – the complete manway assembly, less ring
• Yoke, bolts, nuts and gasket (Specify gasket material)

Features of Elliptical Yoke and Bolt Manways

As a self-energizing unit, yoke and bolt manways require positive internal pressures of at least 50 psi to achieve sealing. Manhole plates and rings are manufactured of materials in accordance with ASME Code specifications. Manhole rings are fabricated or formed from materials listed in Section II and welded per Section IX of the ASME Boiler and Pressure Vessel Code. Identifying marks required by Code Paragraph PG11 and UG-11 are stamped on each ring.

About the Chart

• All dimensions are in inches, pressure ratings are in pounds per square inch and weights are in pounds.
• The nominal size dimensions are the inside dimensions of the ring (width x length x ring thickness x height of ring).
• In the event cover assemblies are ordered without rings, customers are requested to specify their ring heights so bolt lengths can be properly determined.
• Manways with standard pressed covers and standard yokes and bolting are not suitable for use with hard gaskets such as, solid jacketed or spiral wound metal.
• Liability - Responsibility is limited to quality and workmanship of metal parts as proved by vessel fabricators hydrostatic shop test. Liability is limited to replacement of, or credit for, the defective part only. No warranty on gasket service is implied or expressed.