Calcium Ammonium Nitrate CAN-17 Storage — 17-0-0+8.8Ca Solution Tank

Calcium Ammonium Nitrate Solution CAN-17 Storage — 17-0-0+8.8Ca Liquid Fertilizer Tank Selection for Fertigation, Broadcast, and Starter Use

CAN-17 is a clear, water-white to pale-amber aqueous solution of calcium nitrate and ammonium nitrate co-formulated to deliver 17% N and 8.8% Ca by weight. The chemistry is the dominant calcium-source fluid fertilizer in US specialty-crop production: tomato, pepper, lettuce, melon, strawberry, table grape, almond, citrus, and stone-fruit operations all run CAN-17 through fertigation systems for sustained calcium and nitrate-N supply. Density runs 11.7 to 12.0 lb per gallon at 60 degrees F; pH lands in 5.0 to 6.5 range; salt-out crystallization point sits near 25 to 32 degrees F depending on calcium ratio. The chemistry is fully water-soluble and stays in true solution at storage; it does not stratify or precipitate at typical handling concentrations and does not require active agitation in storage.

This pillar covers tank-system selection, regulatory positioning, field application, and procurement guidance for a CAN-17 storage and dispense rig. Citations point to the International Plant Nutrition Institute (IPNI) Nutrient Source Specifics 30 (Calcium Nitrate) for chemistry and agronomy, AAPFCO Model Bill framework for state fertilizer registration, US EPA 40 CFR 122 NPDES framework for discharge management, USDA NRCS Conservation Practice Standard 590 (Nutrient Management) for application planning, OSHA 29 CFR 1910.1200 Hazard Communication for facility worker protection, and DOT 49 CFR 173 for transport classification (CAN-17 finished solution typically ships non-hazardous; bulk ammonium-nitrate-content CAN solutions above certain N concentrations may classify under UN 2426 ammonium nitrate liquid).

1. Material Compatibility Matrix

CAN-17 is mildly acidic (pH 5 to 6.5) with substantial nitrate-ion oxidation potential and a calcium load that drives gypsum-precipitation incompatibility with sulfate sources. Material selection focuses on nitrate oxidation tolerance (rules out copper alloys, bronze, brass), mild-acid resistance (rules out carbon steel and galvanized), and gasket compatibility with the calcium-rich solution.

The dominant fertigation-rig configuration is HDPE rotomolded supply tank (1,500 to 6,500 gallons), PP fittings with EPDM gaskets, CPVC injection plumbing to the irrigation manifold, and 316L diaphragm metering pump with PVDF or PTFE diaphragm. Specialty-crop production operations running CAN-17 through drip-tape fertigation typically use 2,500-gallon vertical HDPE supply tanks with weekly to bi-weekly tanker refill, drip-fed to per-block manifolds via 316L-trim metering pumps.

2. Real-World Agricultural Use Cases

Drip Fertigation on Specialty Crops. CAN-17 is the dominant calcium-source fertigation chemistry for tomato (greenhouse and open-field), pepper, strawberry, lettuce, melon, and table-grape production. Calcium uptake is driven by transpiration, so sustained low-rate fertigation through the crop development cycle delivers far more usable calcium than seasonal broadcast applications. Typical drip-fertigation rate is 5 to 25 gallons per acre per week split across daily fertigation events through the crop development cycle, with rate increasing through fruit-set and early-fruit-fill phases. Calcium supply at fruit-set is the dominant determinant of blossom-end-rot incidence in tomato and pepper; CAN-17 is the primary chemistry for blossom-end-rot prevention.

Foliar Calcium Spray on Tree Fruit. Apple, pear, sweet cherry, and almond producers foliar-spray CAN-17 at 0.5 to 1 gallon per acre in 100 to 200 gallons of water per spray pass, with 4 to 8 spray passes per season at 14- to 21-day intervals through the cell-division phase. Calcium uptake into fruit tissue prevents bitter pit (apple), cork spot (pear), and cracking-disorder susceptibility. Spray applications must avoid co-mixing with sulfate or phosphate chemistry to prevent in-tank gypsum and calcium-phosphate precipitation; sequential application is the standard work-around.

Sidedress on Field Vegetables. Carrot, celery, onion, and brassica producers sidedress CAN-17 at 15 to 40 gallons per acre at the 4- to 6-leaf stage and again at mid-season. The application places calcium and nitrate-N adjacent to the developing root zone for sustained uptake through the bulb-fill or head-formation phase.

Open-Field Tomato Banded Application. Processing tomato producers in California Central Valley, Indiana, and Ohio band CAN-17 at 10 to 20 gallons per acre at planting and 15 to 25 gallons per acre at first-truss-set, placed 4 to 6 inches off-row at 4-inch depth via knife or coulter applicator. The banded calcium-N package supports fruit-set and limits blossom-end-rot pressure on the high-rate processing-tomato production system.

Greenhouse Hydroponic Stock Solution. Hydroponic tomato, pepper, cucumber, lettuce, and leafy-greens production maintains CAN-17 as one of the two A-tank stock solutions (the other typically being potassium nitrate or potassium sulfate). Stock-solution concentrations run 5% to 10% w/w in the A-tank, diluted 100:1 to 200:1 at the irrigation injection point. Constant agitation is not required at the stock concentration; periodic flushing and re-mixing every 30 to 60 days handles any inadvertent precipitation from contamination.

Strawberry Drip Fertigation. California, Florida, and Pacific Northwest strawberry production runs CAN-17 through drip tape at 3 to 8 gallons per acre per week through the harvest season, with rate matched to fruit load and weather. The chemistry supports both nitrogen demand and calcium-driven fruit-firmness; soft-fruit-quality issues frequently trace to under-supplied calcium during peak harvest.

3. Regulatory Hazard Communication

State Fertilizer Registration. Under AAPFCO Model Bill structure, all 50 states require commercial fertilizer products including CAN-17 to be registered annually with the state Department of Agriculture or analogous regulatory authority. Registration includes the guaranteed analysis (17-0-0 + 8.8% Ca), SDS, label submission, sourcing affidavit, and tonnage reporting. California regulates under FAC Division 7 Chapter 5 (FAC sections 14501 through 14640) administered by CDFA Fertilizer Materials Inspection Program; specific state registration ID numbers vary by manufacturer and should be verified directly with the state fertilizer control official before shipment.

Ammonium Nitrate Security Awareness. CAN-17 contains ammonium nitrate as one of two N-source components. Bulk solution ammonium nitrate at the concentration in CAN-17 is generally below the threshold for DHS Chemical Facility Anti-Terrorism Standards (CFATS) covered-chemical-of-interest reporting (the relevant CFATS Appendix A Screening Threshold Quantity for ammonium nitrate is 2,000 lb of solid ammonium nitrate or solution above 33% AN, while CAN-17 typically tests below the reporting threshold). Operators should consult the latest DHS CFATS guidance and conduct a Top-Screen if site inventory exceeds the reporting threshold. Bulk ammonium-nitrate fertilizer regulation under EPA TSCA is limited; storage locker requirements at the federal level are minimal but several states have enhanced storage requirements following ammonium-nitrate incidents.

OSHA Hazard Communication. CAN-17 typically classifies as GHS H315 (skin irritation), H319 (serious eye irritation), and H272 (oxidizing liquid Category 3) due to the nitrate content. SDS Section 8 PPE: chemical-splash safety glasses or face shield, nitrile or neoprene gloves, long-sleeve shirt and long pants. OSHA HazCom training under 29 CFR 1910.1200 applies to handling employees. Storage segregation rule: keep CAN-17 separate from organic combustibles, reducing agents, and incompatible-class oxidizers per IFC Chapter 50 storage segregation guidance.

EPA Land-Application and Discharge Framework. Routine agricultural land application of CAN-17 at agronomic rates is regulated under USDA NRCS Conservation Practice Standard 590 (Nutrient Management) when the producer participates in NRCS conservation programs. EPA 40 CFR 122 NPDES rules apply where land-application runoff reaches CWA waters of the US. Storage-tank releases above 5,000 gallons or to navigable waters trigger CWA section 311 reporting. Specialty-crop production states with enhanced nitrate-leaching protections (notably California Irrigated Lands Regulatory Program under CDFA, Florida BMP program, Chesapeake Bay states) impose additional state-level reporting and nitrogen-management-plan requirements.

DOT Transport Classification. CAN-17 finished solution at typical concentration usually ships non-hazardous under 49 CFR 173 because the ammonium-nitrate concentration in the finished solution falls below the regulatory threshold. Bulk-tanker transport in DOT 407 cargo trailers is the standard. Operators should verify the most recent SDS Section 14 for the specific manufacturer's product to confirm transport classification, as formulation variation can shift the AN content and trigger UN 2426 (ammonium nitrate liquid) classification at higher AN ratios.

NFPA 704 Diamond. CAN-17 typically rates Health 1, Flammability 0, Instability 1, OXIDIZER (OX) special hazard. The OX flag drives NFPA 430 storage segregation: keep separated from organic combustibles, reducing agents, hydrocarbons, and incompatible chemistry.

4. Storage System Specification

Tank Sizing per Acreage. A 500-acre greenhouse-tomato or open-field-tomato operation running CAN-17 at 200 gallons per acre per season consumes 100,000 gallons across the production cycle. Typical bulk-storage configuration is 15,000 to 25,000 gallons in a paired-vertical-tank arrangement (two 10,000 to 12,500 gallon HDPE rotomolded tanks) with weekly to bi-weekly tanker refill. Smaller 50- to 200-acre specialty-crop operations typically run 2,500- to 6,500-gallon single vertical HDPE supply tanks. Greenhouse hydroponic stock-solution operations run smaller 250- to 1,000-gallon HDPE batch-mix tanks per A-tank, refilled weekly from a central supply.

Secondary Containment. Federal RCRA does not require secondary containment for non-hazardous fertilizer storage. State and best-practice standards apply: AAPFCO model and most state fertilizer storage rules require secondary containment sized to 110% of the largest single tank in the containment area. For paired 12,500-gallon tanks, containment volume should be sized at 13,750 gallons minimum. Outdoor concrete containment areas should slope to a sump with manual or automatic discharge control to prevent rainwater accumulation overwhelming containment volume.

UV-Light Protection. CAN-17 in clear or translucent storage will undergo slow UV-driven nitrate photolysis (NO3 to NO2 to N2O over months of exposure), losing nitrate-N strength. Black or dark-green opaque HDPE tanks are the standard for outdoor storage; white or translucent tanks should be used only with shade-cloth or roof-shaded placement. Indoor storage in an ag-chem barn fully addresses the UV exposure concern.

Cold-Weather Salt-Out. Salt-out at 25 to 32 degrees F is the dominant cold-weather logistics constraint. In Zone 5 and colder geographies, operators should maintain heated indoor storage above 40 degrees F in winter, install tank-side immersion heaters or in-line recirculation heat-trace where heated storage is not available, schedule winter inventory drawdown to leave bulk tanks at less than 25% full by November 1, and establish supplier callback for spring re-fill rather than carrying winter inventory at cold-temperature risk.

Calcium Sulfate Precipitation Risk. CAN-17 will form gypsum (calcium sulfate) precipitate on contact with sulfate-source chemistry: ammonium thiosulfate, potassium thiosulfate, sulfuric acid, magnesium sulfate, and sulfate-bearing micronutrient blends. Storage tanks for CAN-17 should be physically separated from sulfate storage with hard plumbing isolation; common-headers and shared transfer lines are the dominant source of inadvertent gypsum precipitation in storage.

Ventilation. CAN-17 does not generate vapor at storage conditions. Passive vented manway is sufficient. NOx generation from nitrate decomposition becomes a concern only at elevated temperature (above 150 degrees F) or in fire-exposure conditions; this is the basis of NFPA 430 segregation from combustibles.

5. Field Handling Reality

Pump Selection. Centrifugal pumps with polypropylene wet-end and stainless or ceramic shaft are the standard for transfer and field application. Diaphragm metering pumps with PVDF or PTFE diaphragm cover precision fertigation injection. For high-flow tanker offload (300+ gpm), centrifugal pumps with 2- to 3-inch suction and discharge are standard. Banjo, Hypro, ACE, Pacer, and Pulsafeeder offer CAN-17-rated configurations. Avoid pumps with bronze or brass impeller or carbon steel shaft; nitrate oxidation will degrade copper alloys within weeks.

Valve Materials. Polypropylene ball valves with EPDM seats are the standard for suction and discharge lines. CPVC ball valves and butterfly valves are acceptable for warm-fertigation loops. Stainless 316L valves are acceptable for precision-metering trim and sample ports. Avoid bronze, brass, and aluminum permanent installations.

PPE for Routine Handling. Standard ag-chem PPE for transfer, fill, and field application: chemical-splash safety glasses or face shield, nitrile gloves at minimum (neoprene preferred for sustained contact), long-sleeve shirt, long pants, closed-toe boots. No respirator is required for routine handling at finished concentration.

Tank-Mix Order and Compatibility. When CAN-17 is co-applied with herbicides, insecticides, or non-sulfate micronutrient blends in a single field pass, the standard tank-mix order is: water (50% to 75% of tank volume), then dispersible granules and wettable powders, then suspension concentrates, then CAN-17, then emulsifiable concentrates, then surfactants, then remaining water to volume. Continuous agitation throughout. Verify jar-test compatibility on a 1-quart sample before field-scale mixing on any new combination.

Sulfate Incompatibility. Never co-mix CAN-17 with ammonium thiosulfate, potassium thiosulfate, sulfuric acid, magnesium sulfate, zinc sulfate, manganese sulfate, or any other sulfate-source fertilizer in the same spray tank or fertigation line. Calcium plus sulfate produces calcium sulfate (gypsum) precipitate which will plug emitters, screens, and pump strainers within minutes. Where both nutrients are required in the same field pass, use sequential application with thorough water rinse of the spray tank between products.

Phosphate Incompatibility. Calcium plus orthophosphate produces calcium phosphate precipitate which is similarly problematic. CAN-17 should not be co-mixed with 10-34-0, 0-0-50 SOP soluble plus phosphate, or any orthophosphate fertilizer; sequential application with water rinse is the standard work-around.

Spill Response. Containment first: berm and contain to prevent migration off-site or to surface water. Recover with vacuum truck for return to storage where possible. Residual contamination on soil surface dilutes naturally with rainfall; monitor downgradient surface water for elevated nitrate for 30 days post-spill. Reportable-quantity threshold under CWA section 311 applies to discharges reaching navigable waters; consult state environmental agency for state-specific reporting thresholds. Triple-rinse containers and applicator tanks before disposal or return.

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