Calcium Chloride Storage — 40% Brine Tank System Selection

Storing Calcium Chloride? Start Here

Calcium chloride is a versatile chemical used for road de-icing, dust control, and as a refrigerant. It’s a popular choice because it works well in cold temperatures and is effective in various industrial applications. However, storing it properly is crucial to ensure safety and maintain its effectiveness. Whether you're using it in oil fields or for dust suppression, understanding how to store calcium chloride can save you time and money.

Can you store it in a poly tank?

Yes, you can store calcium chloride in a polyethylene tank. Both HDLPE and XLPE tanks are suitable for a 40% solution, with a specific gravity of 1.5 ASTM being adequate. For outdoor installations, XLPE is often preferred due to better UV resistance, while HDLPE is typically used indoors.

Key Issue: Heat Generation on Dissolution

When you dissolve anhydrous calcium chloride in water, it generates significant heat. This can cause the solution temperature to spike to 180°F, which is too high for polyethylene tanks. Always mix the solution in a dedicated tank and let it cool before transferring it to your storage tank to avoid damaging the tank walls.

The safety that actually matters

• Use EPDM gaskets, which are the standard for calcium chloride service.
• For bolts, use 316SS for continuously wet service, or Hastelloy/Titanium if the tank will experience dry-out cycles.
• For fittings, PVC is suitable, but use Schedule-80 in cold climates to prevent brittleness.

Common questions

Is 30% vs 40% a material spec change?

No, the same materials apply. The specific gravity might change slightly, but the tank materials remain the same.

Can I use the same tank for calcium chloride and sodium chloride brine?

Yes, but be aware that 316SS bolts can pit in both brines if the tank dries out. Use Hastelloy or Titanium for universal compatibility.

What about magnesium chloride?

It uses the same materials as calcium chloride. However, it is slightly more aggressive to aluminum, but the treatment in HDLPE with 316SS is identical.