Solutions · Urea & Melamine Storage
Urea absorbs moisture and cakes, melamine is a fine, dusty powder. PW Silo Systems designs aluminum and stainless steel silos for urea and melamine with you – with the right material, discharge aids, and dust collection for your product.
Urea & Melamine Storage at a Glance
A urea silo stores urea prills or granules close to the process – for resins and adhesives, diesel exhaust fluid production, fertilizer blending, or chemical production. A melamine silo stores melamine powder for resins, laminates, and other applications. Both feed the product in a controlled way to dosing, dissolving, or mixing.
Urea is hygroscopic: when it absorbs moisture, it cakes and bridges. Prills can break and create fines. Melamine is a fine powder that dusts during filling. That is why the silo material, the design, and the discharge equipment are defined together with you for your product and your site.
Why Urea & Melamine Are Demanding
Moisture, caking, and dust decide whether a urea or melamine silo runs reliably.
Urea absorbs moisture from the air. Damp urea cakes into lumps and bridges at the outlet.
Urea prills can break during filling and discharge. Fines change flow behavior and create dust.
Melamine powder spreads during pneumatic filling and conveying and settles on equipment.
In coated carbon steel silos, flaking coating and rust can end up in the product – a problem for resins and high-purity applications.
In funnel flow, product can stay in the silo for a long time and cake while fresh product passes through the center.
Urea, melamine, and other raw materials must not be mixed by accident.
Silo Materials
We build silos exclusively in aluminum and stainless steel. Carbon steel is not an option for us: its coating is the only protection against corrosion – and flaking coating or rust can end up in your product.
Which of our two materials and which design fit your urea or melamine silo depends on the product, its moisture, your process, and your site. We define the material and the design with you.
Your Urea & Melamine Silo System
Silo, discharge, blending, filtration, and monitoring are engineered as one system. That means fewer interfaces for your team and components that are designed to work together.
Storage
Concentric mass-flow discharge without asymmetric flow zones – as standard, site-assembled, indoor, or multi-compartment silos.
Learn moreBlending
Gravity blending and homogenizing with four technologies, including PW ConeBlend with a hopper that is quick to clean.
Learn moreDischarge
Air fluidization for uniform discharge of poorly flowing products – prevents bridging and can be retrofitted to existing silos.
Learn moreDischarge
Vibration from unbalanced motors breaks up cohesive forces, resolves caking, and keeps the outlet clear.
Learn moreFiltration
Dust separation during pneumatic filling and conveying – sized for fine powders.
Learn moreMonitoring
Level measurement for reliable monitoring of the silo content – so you know when to reorder.
Learn moreUrea, Melamine & Related Products
Products marked “Tested in our lab” are on our list of bulk materials. The others we review with you based on your material data before designing the silo.
Tested in our lab
Urea, urea prills, granular urea, carbamide
Urea is on our list of bulk materials tested in our lab. Silo and discharge are designed for its hygroscopic nature.
Tested in our lab
Melamine, melamine powder, melamine crystal
Melamine is on our tested list. Its fine particles are considered in hopper design and dust collection.
Review with us
Ammonium sulfate, AMS
Ammonium sulfate is used in fertilizers and industry. We review your product data with you before designing the silo.
Review with us
Potassium chloride, potash, KCl
Potassium chloride is a corrosive salt. Material and design we define with you.
Review with us
NPK fertilizer, blended fertilizer, granular fertilizer
Fertilizer blends behave differently depending on their recipe and granule size. We review the right storage with you.
Review with us
Urea-formaldehyde and melamine resin powders
Resin powders have specific flow and safety requirements. We review them with you.
Also tested in our lab:
Send us your material data and we will review the right solution with you:
Product Check
Type in your product or any other bulk material to see whether it has already been tested in our lab. The list covers 287 bulk materials.
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Service in the U.S.
With more than 40 years of experience in silo engineering, we support your urea or melamine silo project from the first design discussion to commissioning. We deliver to every U.S. state and install with our own qualified personnel.
FAQ
Answers to the questions plant managers, engineers, and buyers ask most often about storing urea and melamine in silos.
Yes – in a properly designed silo. These products are on our list of bulk materials tested in our lab:
Ammonium sulfate, potassium chloride, fertilizer blends, and resin powders we review with you based on your material data.
A closed silo protects urea from outside moisture. Discharge aids such as PW SpeedBlow air fluidization and bin activators break up bridges and caking and keep the outlet clear. Storage conditions for your site we clarify with you.
Prills can break during filling and discharge, which creates fines and dust. Silo geometry, filling, and discharge are designed with you for gentle product handling.
Integrated filters and PW FilterLine dust collectors separate dust during pneumatic filling and conveying. Filter size and venting are matched to your filling rate and your product.
In mass flow, the entire silo content moves downward when material is discharged – not just a channel in the center. Your urea leaves the silo in the order it came in (first in, first out), and no product is left behind in dead zones. Our PW StoreLine silos are designed for concentric mass-flow discharge without asymmetric flow zones.
We build silos exclusively in aluminum and stainless steel – never in coated carbon steel. Which material and which design fit depends on the product, its moisture, your process, and your site. We define them with you.
The right size depends on your daily consumption, delivery intervals, the number of products, and the space available at your site. PW StoreLine silos are available in a wide range of sizes and diameters, and silos too large for road transport are assembled on site. We size the system with you – without oversized investment.
Yes. We deliver to every U.S. state and support your project with silo transport, field assembly, silo installation and supervision, and site relocation of existing systems.
Very likely. Our silo systems are designed for nearly all free-flowing, granular, and powdered bulk solids. Send us your material details – particle size, bulk density, moisture, and how the product is filled and discharged – and we will review the right storage solution with you.
Tell us about your products, required storage capacity, how the silo is filled and discharged, and your site conditions. Based on this, we work out the material, silo type, and configuration with you and send you a detailed quote.
