Urea Solution Storage — 50% Agricultural Fertilizer Tank System Selection

Storing Urea Solution? Start Here

Urea solution at 50% concentration is a staple in North American agriculture, primarily used as a nitrogen-fertilizer carrier. It's often blended with ammonium nitrate to create UAN or used on its own. While it's generally safe for polyethylene tanks, the main concern is preventing crystallization. This solution crystallizes at 62°F, which can cause blockages and operational issues in colder climates. Proper insulation or heating is essential to maintain functionality.

Can you store it in a poly tank?

Yes, you can store 50% urea solution in polyethylene tanks. Both HDLPE and XLPE are suitable, with XLPE being preferred for outdoor use in sunny areas. Just ensure the tank is designed for a specific gravity of 1.35, which is more than adequate for urea's 1.13.

Watch out for crystallization

The biggest issue with storing urea solution is crystallization, which can occur when temperatures drop below 62°F. This can block pumps and give false tank readings. To prevent this, consider heating, insulating, or using a lower concentration solution to avoid freezing.

The safety that actually matters

• Ensure proper ventilation to manage trace ammonia off-gassing.
• Use EPDM gaskets and 316SS bolts for fittings, or Hastelloy for outdoor use.
• Consider secondary containment to prevent environmental runoff.

Common questions

Can I use a DEF tank for agricultural urea?

While the materials are similar, cross-contamination can ruin DEF. Use separate tanks.

What about UAN blends?

UAN blends need dedicated tanks. XLPE isn't always approved, so check specifications.

Is urea a fire hazard?

No, 50% urea solution is non-flammable, though crystallized urea can decompose under extreme conditions.