Nalco Pretreatment Solutions (PTS)Â 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:
A complete top assembly or cover assembly can be supplied for existing installations and consists of:
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.
Nominal Size | Pressure Rating | Yokes | Bolt Size | Approx. Weight | ||
No. | Size | w/ring | w/o ring | |||
11 x 15 x 3/4 x 3 | 300 | 2 | 12 x 3.5 | 3/4 | 59 | 31 |
11 x 15 x 3/4 x 4 | 300 | 2 | 12 x 3.5 | 3/4 | 69 | 31 |
12 x 16 x 3/4 x 3 | 300 | 2 | 12 x 3.5 | 3/4 | 68 | 45 |
12 x 16 x 3/4 x 4 | 300 | 2 | 12 x 3.5 | 3/4 | 78 | 45 |
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