Accessories: Fiberglass Manways
Standard fiberglass manways are 22" diameter. Optional 30" and 36" manways are available.
The standard 22" manway has a maximum load-bearing capacity of 1,400 lbs. Each comes with a painted carbon steel cover, a gasket, 24 zinc-coated 1/2" x 1-1/2" bolts and nuts. Fittings in manway lids are 4" steel NPT half couplings.
WARNING: An underground tank constitutes a confined space. Never enter a tank without proper training and OSHA-approved equipment.
NOTE: The use of manways is not intended to encourage tank entry, which can pose a safety hazard for unqualified mechanics, especially after product has been stored in the tank.
Stainless Steel Bolt Rings: Containment Solutions can provide a stainless steel bolt ring for use with fiberglass manways and sealed turbine enclosures on single-wall tanks. The bolt ring is manufactured in two halves and provides a flexible semi-circle of bolts that will stay in position in a flange and allow the nuts to be tightened without the use of a wrench to keep the bolt from turning.The bolt ring is manufactured of 304 or 316 stainless steel with non-galling silicone bronze nuts, providing improved corrosion resistance over plated bolts, nuts and washers.
Optional Manway Covers in Stock:
- All fittings are standard 4" NPT steel. Typical fitting configurations are available by contacting our Inside Sales Group.
- All manway covers should include at least one fitting to facilitate future volumetric precision tank testing.
Fiberglass Manway Extensions: Tank entry in high groundwater conditions and/or deep burials may require the use of manway extensions. When properly bolted to a tank-mounted manway, the manway extension will provide a watertight access route to the tank interior. Fiberglass manway extensions of 22", 30" and 36" diameters are available in 2' lengths. Each manway extension includes a gasket and set of nuts, bolts and washers.
Fiberglass Manway Riser: The optional fiberglass manway riser provides a non-corroding passage from a manhole box and cover (traffic areas require reinforced concrete road surface) down to the tank manway. The manway riser is available in 30" thru 54" lengths in 6" increments. It consists of a 48" diameter tube, open at one end, partially closed on the other end, with a 22-1/2" centered square hole with rounded corners. If buoyant conditions can exist and the tank has more than one manway riser, contact Tank Technical Service for proper tank anchoring recommendations for the installation.
