Pamtight manhole covers are pressure sealed and made from ductile iron. They are the optimum choice for applications where air and water-tightness are required. 100% ductile iron, these covers are designed to be highly durable. The pressure tight design ensures an airtight and watertight seal to a 14-psi positive or negative rating. The fastening bolt and clamp design allows for the cover to be replaced in any orientation and remain seated.
Available in 24″ and 32″ Clear Opening
Pressure Tight Design
Pamtight manhole covers are designed to prevent the infiltration or escape of air and water to a 14-psi (1-bar) positive or negative pressure rating. Design features:
- Elastomer sealing ring ensures watertightness (confirmed during seven-day trial in hydraulic laboratory).
- Design incorporating both stainless steel bolts (6) and clamping claws allows higher performance sealing.
- After opening, cover can be put back in any orientation and remain pressure tight.
- Pamtight Manhole Covers made from ductile iron and watertight
Safety
Pamtight manhole covers are designed for safe use by installers and maintenance personnel. This safe design is made possible by ductile iron, which provides a superior strength-to-weight ratio, allowing up to a 50% weight savings compared to cast iron designs. In addition, ductile iron has a safe mode of failure – even in the unlikely event that cover dishes and/or cracks, it remains strong and therefore protects the public from accidents.
Pamtight Strength And Durability:
- Pamtight manhole covers are designed to be highly durable, a benefit that is made possible by the excellent mechanical performance of ductile iron.
- With a load bearing rating of 100,000 lbs, three times the load strength of typical cast-iron covers, the Pamtight manhole cover exceeds the AASHTO H20 heavy duty load resistance requirement.
- Polyethylene seating ring ensures perfect seating, resistance to traffic shock.
- Bolts are in an enclosed pocket and thus are not exposed to hydrogen sulfide attack and corrosion through sewer gases. This feature ensures that bolts won’t rust to the frame and must be drilled out.
