Sand-cast precision for reliable manhole sealing
Timing is everything, especially in this collaboration. Just after renewing our ISO 9001 certification, LAG approached us with the request to produce manhole collars. These rings seal the manhole covers on both the front and rear of the trailer. During loading, unloading and transport, they must continuously resist deformation caused by temperature shifts, pressure fluctuations and mechanical stress. Their role is critical: sealing must remain intact, no leaks, no failures.
LAG provided samples of the existing collars, which RG Castings Group used for a thorough analysis. Rather than copying the original, we delivered a redesigned solution: a high-quality aluminium cast part, made with our sand casting expertise.
Beyond the standard: aluminium cast part with 20% elongation
The technical requirement for these collars is demanding. A minimum elongation of 12 to 13% is needed to prevent cracking under long-term stress. By opting for a single aluminium cast part produced through sand casting in a special alloy, we effortlessly exceeded this threshold. Our solution reaches an elongation of 20%, offering a substantial margin in both safety and longevity.
The first production series met all specifications. Today, we’ve scaled up to an annual volume of 3,000 units.
