Wheat Grain

Wheat is the material most people picture when they think of bulk solids, and the grain industry has the accident record that comes with volume.

Dust at every transfer

Kernels abrade and carry field dust, and the elevator leg is the classic place where a dust cloud, an ignition source and confinement meet.

• Enclosed transfers with extraction at intake pits, elevator boots and conveyor heads.
• Housekeeping that removes settled dust rather than relocating it with compressed air.
• Explosion venting and isolation on elevators and filters.

Storage condition

Grain is a biological product with living contents, and both the kernel and anything living in it respire.

Aeration controls moisture migration and temperature gradients that would otherwise create a wet, mouldy layer at one end of the silo.

Temperature cables and regular sampling catch a developing hot spot before it becomes a quality loss or a fire.

Engulfment

Flowing grain pulls a person under in seconds, and bridged grain collapses without warning.

Lockout of all discharge equipment, fall protection, a trained observer and a tested rescue plan are the baseline for any entry.

Mechanical choices

Belt conveyors, chain conveyors and bucket elevators each have a place; the selection usually turns on capacity, grain damage and how much dust each generates.

Pneumatic conveying is used for shorter transfers and ship unloading, with velocity kept low enough to avoid kernel damage and excessive fines.

What to establish before buying equipment

• Intake rate and the peak harvest surge, which usually sets the design.
• Moisture range on receipt and the drying capacity needed.
• Dust extraction volumes at each generation point.
• Entry procedure and rescue capability before the first silo is commissioned.