In heavy-duty or mining refinery environments, chain tracking issues and drive cog jumping are typically caused by an accumulation of high-density materials, uneven tensile stress, or thermal expansion. When standard hardware is exposed to extreme temperatures or high chain-pull requirements under full load, the chain stretches unevenly, causing misalignment with the drive sprocket.

Noggrann solves this by retrofitting systems with custom-engineered Hapman chain and sprocket assemblies that are precisely matched to the material characteristics and operating temperatures, ensuring perfect drive cog tracking even during continuous operation.

Yes. Replacing an entire industrial conveyor system requires significant capital expenditure (CAPEX) and extensive plant downtime. If your existing pipework and drive boxes are still structurally sound, Noggrann can perform a surgical internal retrofit.

As demonstrated in our Pilbara mining refinery case study, we successfully recovered the client’s existing infrastructure and only replaced the failing internals with heavy-duty Hapman round-link chains and treated sprockets. This eliminated a catastrophic 5-day failure cycle while saving the client the cost of a full infrastructure overhaul.

While cable conveyors are well-suited for fragile food-grade products, high-temperature and highly abrasive industrial materials require a heavy-duty round-link or rivetless chain system. Sealed steel cables can suffer from localized jacket degradation under extreme heat, leading to hidden core failures.

An engineered, hardened steel chain layout provides superior resistance to component thinning and high chain-pull demands. For extreme environments like the Pilbara, the internals should be custom-treated to withstand abrasive friction and thermal expansion without suffering from accelerated wear.

Chain snapping during a loaded start occurs when an underspecified conveyor attempts to move a heavy or settled column of material, exceeding the chain's maximum tensile strength.

To prevent these tensile failures, Noggrann utilizes high-torque, low-speed patented link and pin-type chain designs capable of starting and stopping while fully loaded. Combined with our air-over-hydraulic auto-tensioner, the system dynamically absorbs high start-up stresses, preventing chain fatigue and snapping in extreme operating environments.

Wear management in tubular drag conveyors is achieved by focusing on two main goals: minimizing friction and reducing stress on components. Several simple operational and design strategies are used to maximize the equipment's lifespan:

1. Minimize Chain-Pull: Circuits are kept as short and straight as possible, as every bend or corner increases friction and stress on the chain.

2. Minimize Chain Speed: Running the conveyor at the slowest possible speed to meet throughput requirements drastically reduces abrasive wear over time

3. Harden Pipe Bends: Critical friction points, like the pipe bends, are manufactured using hardened materials to better resist abrasive action

4. Utilize UHMW Polyethylene Flights: UHMW is low-friction, self-lubricating, and imparts significantly less wear to the interior of the conveyor tube and pipe bends.

Tubular drag conveyors can handle a wide variety of materials, including powders, granules, pellets, chips, and even slurry. They are particularly effective with delicate or friable materials (like coffee beans, cereals, or pellets) because the gentle motion. The high-torque, low-speed mode of operation makes these conveyors a natural candidate. The conveyor's design is optimized to minimize the degradation of friable materials.

Chain-pull is the principal design consideration. It is a measure of the cumulative resistance of a circuit to the action of pulling a conveyor chain assembly through it. Fundamentally, the chain-pull calculation is used to determine whether a circuit 'works'—to prove that the cumulative inherent resistance does not exceed the strength of the chain itself. However, even when the circuit technically ‘works’, remember that as chain-pull increases, so does wear, power consumption, and cost (both initial purchase prices and maintenance costs over the lifetime of the conveyor).

The key difference lies in the method of movement and enclosure.

Auger/Screw: Uses a rotating screw to push material through a U-trough or tube, which can cause higher friction, potential dust leakage, and material shearing.

Tubular Drag: Uses a sealed pipe and discs/chain to gently drag product, offering dust-tight containment and low degradation.

A tubular drag conveyor is a mechanical conveying system that uses a chain or cable linked with evenly spaced circular discs (flights) to gently drag bulk materials through an enclosed pipe or tube. It is used to move materials horizontally, vertically, or at an incline while protecting them from contamination