Designed for vacuum external pressure applications Clamp bolt manways are a low profile alternative to the yoke & bolt manway Clamp bolt manways are a reasonably priced unit for vacuum applications. The standard assembly consists of a reinforcing ring, pressed cover, holding clamps with bolts, and a gasket. Rings and covers are available in carbon steel or stainless steel.
Standard clamp bolt vacuum manway dimensions and ratings.
| Nom. Size (in.) | Cover Thickness (in.) | Pressure Rating (psi) | Weights (lbs.) | |||
| Carbon Steel | Stainless Steel | Carbon Steel 0 corr. all. | Stainless Steel up to 200F | Ring 3/4 X 3/1 X 3 | Ring 3/4 X 4/1 X 4 | |
| 11 X 15 | 5/16 | 5/16 | 300 | 250 | 47/56 | 56/68 |
| 11 X 15 | 1/2 | 1/2 | 600 | 382 | 68/77 | 77/89 |
| 12 X 16 | 3/8 | 3/8 | 300 | 250 | 53/63 | 62/74 |
| 12 X 16 | 1/2 | 1/2 | 600 | 382 | 74/85 | 85/97 |
| 14 X 18 | 3/8 | 3/8 | 300 | 300 | 74/85 | 85/99 |
| 14 X 18 | 1/2 | 1/2 | 600 | 600 | 101/112 | 112/126 |
| 18 X 24 | 1/2 | 1/2 | 200 | 200 | -/169 | -/188 |