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Potassium Chloride Storage — MOP, Brine, Water-Softener Tanks

Storing Potassium Chloride? Start Here

Potassium chloride, often referred to as muriate of potash, is a versatile chemical used in various industries, from water softening to agriculture. If you're considering storing potassium chloride, whether for a water softener or as a fertilizer component, it's crucial to understand the storage requirements to maintain its effectiveness and ensure safety. This guide will help you navigate the essentials for storing potassium chloride efficiently.

Can you store it in a poly tank?

Yes, you can store saturated potassium chloride brine in a high-density polyethylene (HDPE) tank. It's rated as satisfactory for use at both 70°F and 140°F, making it a reliable choice for various applications.

Key Issue: Crystallization

One challenge with storing potassium chloride is crystallization. When temperatures drop below 10°C, the saturated brine can start to form crystals on the tank walls and bottom. This can lead to blockages and maintenance headaches, so it's essential to monitor temperature and maintain proper saturation levels.

The safety that actually matters

  • Ensure the tank is rated for the specific gravity of saturated brine (1.19 SG).
  • Use EPDM gaskets for reliable sealing.
  • Install the tank on a properly rated concrete pad to support the heavy load.
  • Avoid brass or bronze fittings to prevent corrosion.

Common questions

What type of tank is best for potassium chloride?
High-density polyethylene (HDPE) tanks are suitable for storing potassium chloride brine.
Can potassium chloride be stored in cold climates?
Yes, but be aware of crystallization below 10°C, which can cause maintenance issues.
What fittings should I use?
Use PVC, CPVC, or polypropylene fittings to avoid corrosion. Avoid brass or bronze.

Potassium Chloride storage tanks from OneSource

For potassium chloride storage, specify HDLPE rated to specific gravity 1.9. Verified, compatibility-matched options:

Confirm chemical compatibility and a ZIP freight quote with our team at 866-418-1777.

Designing the storage system, not just picking a tank?

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Sources & References

All compatibility ratings, hazard classifications, and chemical identifiers on this page are sourced from authoritative third-party publications. Verify against the original references before final specification.

  1. PubChem Compound Database — entry for Potassium Chloride (CID 4873, CAS 7447-40-7). pubchem.ncbi.nlm.nih.gov. National Library of Medicine / NCBI. Canonical chemical-identity reference.
  2. Snyder Industries Chemical Resistance Recommendations — system-of-construction guidance for polyethylene chemical-storage tanks at industrial ASTM 1.9 SG design rating. SNY-3041 Chemical Resistance Chart. Snyder Industries, current edition. Resin + fitting + gasket + bolt MOC matrix.
  3. Equistar Technical Tip — Chemical Resistance of Polyethylene — LDPE / MDPE / HDPE rating chart by concentration and temperature, distributed by Enduraplas. enduraplas.com (PDF). Equistar polyethylene resin chemical-resistance data, distributed via Enduraplas.
  4. NFPA 704: Standard System for the Identification of the Hazards of Materials for Emergency Response. nfpa.org. NFPA 704 'fire diamond' health/flammability/instability/special-hazard rating system (0–4 scale).
  5. UN Globally Harmonized System of Classification and Labelling of Chemicals (GHS), current revision. unece.org/transport/ghs. GHS pictograms, signal words, and H-statement codes referenced in this guide.
  6. ASTM D1998 — Standard Specification for Polyethylene Upright Storage Tanks, current edition. astm.org. Cited as the design-specific-gravity standard (typically 1.9 SG) for industrial chemical-service polyethylene tanks.
  7. NIOSH Pocket Guide to Chemical Hazards — occupational exposure limits, PPE, and IDLH data for Potassium Chloride. cdc.gov/niosh/npg. CDC / NIOSH chemical-specific occupational-safety reference.

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