Chemical Mixing and Batch Processing: Tank Selection and Installation Guide
Chemical Mixing and Batch Processing
Industrial mixing operations, water treatment facilities, agricultural custom applicators, and chemical distribution companies all need tanks purpose-built for chemical mixing. The key difference from simple storage is that mixing introduces additional stress — agitation forces, temperature variations from exothermic reactions, and the need for complete drainage between batches to prevent cross-contamination.
Why Tank Selection Matters for Chemical Mixing and Batch Processing
Not every polyethylene tank works for every application. The wrong tank can mean chemical incompatibility, premature failure, regulatory violations, or simply wasted money on features you don't need. This guide walks you through the specific requirements for chemical mixing and batch processing and matches you with the right tank from our catalog.
Key Requirements
- Cone Bottom Design — Complete drainage between batches prevents cross-contamination and eliminates dead volume.
- Chemical Rating — Must exceed the SG of the heaviest chemical you will mix. Factor in concentration changes during the mixing process.
- Agitation — Mechanical mixers create lateral forces on tank walls. Verify the tank is rated for mixer mounting if applicable.
- Temperature — Exothermic mixing reactions can spike temperatures. Polyethylene tanks are rated to 120°F maximum.
Recommended Tank Types
Cone Bottom Tanks
Purpose-built for batch processing with complete drainage. Available in 15, 30, and 45 degree cone angles.
Shop Cone Bottom Tanks
Vertical Chemical Storage
For pre-mix ingredient storage and finished product holding.
Shop Vertical Chemical Storage
Installation Considerations for Chemical Mixing and Batch Processing
Stand Requirements
Cone bottom tanks require a stand that supports the full loaded weight of the tank. Stands must be rated for the specific tank model and installed on a foundation rated for the combined weight of tank, stand, and contents.
Drain Valve Selection
The drain valve is the most critical fitting on a mixing tank. Choose a full-port ball valve for unrestricted flow and easy cleaning. Butterfly valves work well for larger sizes. Never use gate valves — they trap product in the valve body and are impossible to clean completely.
Sizing Your Tank
Tank sizing for chemical mixing and batch processing depends on your usage rate, refill frequency, and peak demand. The general formula is:
Required Capacity = Daily Usage × Days Between Refills × 1.2 Safety Factor
The 1.2 safety factor accounts for peak usage days, delivery delays, and the fact that you should never run a tank completely dry (the sediment at the bottom can clog fittings and pumps). If your application has seasonal peaks, size for peak demand rather than average demand.
Maintenance Specific to Chemical Mixing and Batch Processing
Standard polyethylene tank maintenance applies: quarterly visual inspection, fitting checks, foundation verification, and vent maintenance. For chemical mixing and batch processing specifically, pay extra attention to:
- Chemical compatibility: If you change chemicals or suppliers, verify the new formulation is compatible with polyethylene and within the tank's specific gravity rating before adding it to the tank.
- Residue buildup: Some liquids leave residue on tank walls over time. Annual interior inspection and cleaning prevents buildup from affecting liquid quality or reducing effective capacity.
- Fitting condition: Applications with frequent connect/disconnect cycles wear fittings faster. Replace threaded fittings at the first sign of thread damage — a cross-threaded or stripped fitting is a leak waiting to happen.
- Secondary containment: If required by your local regulations, inspect containment berms, dikes, or trays during each tank inspection. Secondary containment only works if it's intact.
Frequently Asked Questions
What size tank do I need for chemical mixing and batch processing?
Start with your daily usage rate and multiply by the number of days between refills, then add 20% for safety margin. For example, if you use 50 gallons per day and refill weekly, you need: 50 × 7 × 1.2 = 420 gallons minimum. Round up to the next standard size — in this case, 500 gallons.
Do I need a chemical-rated tank or a water-only tank?
If you are storing anything other than clean water, choose a chemical-rated tank (SG 1.5 or higher). The thicker walls and higher material rating provide safety margin for chemical exposure, and you won't need to replace the tank if you switch liquids later. Water-only tanks save money but limit your future options.
What permits do I need?
Permit requirements depend on your location, the tank size, and what you are storing. Water storage typically requires no permits below 5,000 gallons. Chemical storage often requires permits, secondary containment, and fire marshal review. Agricultural exemptions may apply for farm chemical storage. Always check with your local building department and fire authority before installation.
Can I install the tank myself?
For tanks under 500 gallons, DIY installation is straightforward if you follow proper site preparation and plumbing practices. For larger tanks, we recommend professional installation — the weight involved creates safety risks, and improper placement can void the warranty. Either way, a proper foundation is non-negotiable.
How do I handle delivery and placement?
Small tanks (under 200 gallons) ship via UPS/FedEx ground. Mid-size tanks (200-1000 gallons) ship LTL on a pallet — you'll need a forklift or request liftgate delivery. Large tanks (1000+ gallons) ship via flatbed and require equipment for unloading. Call us to coordinate delivery logistics for your specific site conditions.
Need expert guidance on tank selection for chemical mixing and batch processing? Call (866) 418-1777 — we'll help you size, select, and plan your installation.