DSH Systems: Before & After DSH7 Truck Loading Limestone Sand

Clear Vision, Cleaner Air: DSH7 Minimizes Dust by Design

This video puts truck loading side by side: the same limestone sand transfer before and after installing the DSH 7 Corten-steel Dust Suppression Hopper (DSH).

The "after" footage shows the system loading limestone sand at up to 950 metric tons per hour while virtually eliminating airborne dust.

The Dusty Challenge

Loading bulk materials like limestone sand stirs up significant dust. In the "before" footage, trucks vanish in a dense cloud. Visibility suffers, workers inhale harmful particles, and equipment and site surfaces get dirty fast. That raises safety risks, maintenance effort, and compliance concerns.

DSH Systems designed its hopper to tackle this at the transfer point. Installed under the feed point, it prevents dust at the source rather than suppressing dust that has already escaped.

How the Hopper Works

The hopper sits directly beneath the inlet of a loading chute or conveyor. As material enters:

• The weight of the material opens a spring-loaded discharge gap.
• Material flows outward in an annular shape.
• Ambient air is displaced and escapes from the material.
• A solid "plug" of material forms and falls almost dust-free.
• Dust stays sealed within that column, so little is released on impact.

On screen, the limestone sand drops into the truck as a narrow, high-density stream instead of a dust cloud.

Why It Matters

• Air quality: no ambient dust means safer working conditions, less clean-up, and easier compliance with health regulations.
• Maintenance: the DSH runs without electric, hydraulic, or pneumatic controls. A spring mechanism does the work, so servicing stays minimal.
• Product preservation: dust stays trapped within the flow rather than escaping, which cuts product loss and contamination.
• Installation: the hopper integrates into existing systems with little downtime or site modification.

Performance Highlights

• Loading rate in the video: 950 metric tons per hour of limestone sand.
• Model range: DSH hoppers cover throughputs from 50 tph to over 2000 tph, adjusted to material type and density.
• Construction: this demonstration uses a Corten-steel hopper; stainless steel and polyethylene versions suit abrasive or corrosive products.

Applications and Industries

The same principle applies across bulk-loading operations:

• Truck loading, as in this limestone case
• Railcar and ship loading
• Stockpile filling and warehouse loading
• Food, fertilizer, grain, mineral, and fuel operations

The Engineering Behind DSH

DSH Systems launched in 2004 in New Zealand, founded by engineer Trevor Schwass to end dust problems during loading. Over ten thousand hoppers now operate across forty countries through a global distributor network.

The design itself stays simple and robust: spring-balanced flow control, no external power, and fast installation with a quick return to operation after setup.