Panels are rolled, punched, and coated in the factory, then bolted ring by ring on site using jacking systems that lift the shell as each lower ring is added. Joints are sealed with mastic or EPDM gaskets. Powder is filled pneumatically or by elevator through the roof, stored on a cone or flat bottom, and discharged through feeders sized for the plant throughput.
Challenges
Joint Leakage of Fine Powders
Fine powders below 50 micron migrate through inadequately sealed bolted joints, causing housekeeping loss, dust exposure, and moisture ingress paths.
Bolt Torque Relaxation
Thousands of joint bolts relax under thermal cycling and wind-induced shell movement, gradually opening seams if not retorqued.
Sealant Degradation Under UV and Weather
Outdoor mastic and gasket materials harden and crack under UV exposure and temperature cycling, opening moisture ingress paths into the stored powder.
Site Assembly Quality Dependence
Storage integrity depends on site workmanship; misaligned panels or missed sealant runs are difficult to detect after erection.
Coating Damage During Erection
Panel handling and bolting scratch protective coatings, creating localised corrosion cells that shorten shell life in humid coastal climates.
Solutions
- Double-Row Bolting with Continuous Gasket Strip: Twin bolt rows compressing a continuous EPDM strip along every seam produce a dust-tight joint verified by internal light testing after erection.
- Scheduled Torque Audit Programme: A documented first-year retorque at three and twelve months, then annual sample audits, maintains joint clamp load through the shell service life.
- UV-Stable Polyurethane Seam Sealant: Specifying UV-stabilised polyurethane sealant over each external seam maintains weather sealing for ten years or more between planned reseals.
- Certified Erection Crew with Hold-Point Inspection: Manufacturer-certified erection teams working to hold-point inspection sheets for alignment, sealant, and torque assure consistent joint quality before handover.
- Touch-Up and Cold Galvanising Protocol: Mandatory post-erection inspection with zinc-rich touch-up on every coating breach restores barrier protection before the silo enters service.
Applications
- Flour Mill Finished Product Storage: Large-capacity storage of atta, maida, and semolina at roller flour mills ahead of bulk tanker and bagging dispatch.
- Cement and Fly Ash Terminal Storage: Terminal and batching plant storage of cement, fly ash, and GGBS with aeration-assisted discharge.
- Sugar Refinery Bulk Storage: Conditioned bulk storage of refined sugar with dehumidified air blanketing before packing lines.
- Soda Ash and Bulk Chemical Storage: Storage of soda ash, STPP, and bulk chemical powders at detergent and glass manufacturing plants.
- Grain and Feed Ingredient Storage: Storage of milled feed ingredients and grain products at feed mills and food processing complexes.
Model Range and Capacity: JBM-BS Series
Basis: 55 degree cone, 400 mm outlet, working volume 90 percent of gross.
| Model | Dia (m) | Cyl. Ht (m) | Overall Ht (m) | Gross Vol (m3) | Working Vol (m3) | Capacity (t) @ 0.6 t/m3 |
|---|---|---|---|---|---|---|
| JBM-BS-90 | 4.0 | 6.0 | 9.1 | 87.4 | 78.6 | 47.2 |
| JBM-BS-180 | 5.0 | 8.0 | 11.8 | 180.4 | 162.4 | 97.4 |
| JBM-BS-320 | 6.0 | 10.0 | 14.5 | 323.1 | 290.8 | 174.5 |
| JBM-BS-525 | 7.0 | 12.0 | 17.2 | 525.9 | 473.3 | 284.0 |
| JBM-BS-800 | 8.0 | 14.0 | 19.9 | 799.4 | 719.5 | 431.7 |
| JBM-BS-1150 | 9.0 | 16.0 | 22.6 | 1154.1 | 1038.7 | 623.2 |