6500 Gallon Vertical Liquid Storage Tank - Natural White (119" x 150"): Complete Buyer's Guide
At 6,500 gallons and over forty tons when full, this Norwesco vertical is among the largest single-piece poly tanks made — 150 inches tall on a massive 119-inch base, fitted with a 3-inch siphon outlet to move serious volume. The 1.5-SG wall is built for fertilizers and industrial chemicals to 12.5 pounds per gallon.
Specifications at a Glance
Every figure below is pulled straight from the live product record for this exact tank — the same data on the product page, so what you read here and what you buy never disagree.
Standards & Materials
- ASTM D1998 — Standard Specification for Polyethylene Upright Storage Tanks. Governs wall-thickness and hydrostatic design for vertical rotomolded poly tanks of this class.
- FDA 21 CFR 177.1520 — Olefin polymers. The food-contact regulation the FDA-grade resin in this tank is compounded to meet.
- Specific gravity rating 1.5 — the tank is engineered for liquids up to 1.5× the density of water (water is about 8.34 lb/gal). Confirm your fluid’s SG before storage.
Product Overview
The 6500 Gallon Vertical Liquid Storage Tank is bulk storage at the upper end of what rotational molding can produce in one piece. Standing 150 inches tall on a broad 119-inch base, it anchors a large fertilizer operation or an industrial chemical feed where a single tanker delivery needs somewhere to go. This is a fully engineered installation from foundation to plumbing.
It is outfitted for volume. The outlet is a 3-inch fitting with a 2-inch reducer and a 3-inch siphon tube — sized to fill or empty thousands of gallons without bottlenecking. The wide 119-inch base is itself a feature: it spreads the enormous load over 77.2 square feet, keeping pad pressure lower than a narrower tank of similar volume would. Translucent white walls still allow level reading and reflect heat across that large surface.
Empty, the tank weighs 1,290 pounds and requires equipment to handle. Filled with a 1.5-SG liquid it reaches about 82,605 pounds — over forty-one tons that demand a professionally engineered reinforced foundation. The 16-inch lid serves top access for cleaning and instrumentation. No inlet ships from the factory; a bulkhead is added to suit the system.
Even at this scale it is molded seamlessly, with UV stabilizer in the resin and Norwesco's 3-year defect warranty. Its size requires dedicated freight and careful site access, which we coordinate with you.
Technical Drawing
Official Norwesco technical drawing — 6500 Gallon Vertical Liquid Storage Tank - Natural White (119" x 150")
Key Features and Specifications
- 6,500-gallon capacity — sized for agricultural chemical and fertilizer storage
- Constructed from virgin linear polyethylene (HDPE) with 1.5 specific gravity rating — handles liquids up to 12.5 lbs/gal
- 150" tall x 119" diameter — compact vertical footprint
- 1290 lbs empty, approximately 82,605 lbs when full at rated specific gravity
- 3" with 2" Reducer and 3" Siphon tube NPT outlet fitting — factory installed and leak-tested
- 16" lid opening for fill, venting, and interior access
- FDA approved for potable water and food-grade liquid contact
- 3 Year Warranty from Norwesco against manufacturing defects
- Translucent white walls allow visual level monitoring without opening the tank and reflect sunlight to keep contents cooler
- Rated for continuous service up to 120 F / 48 C
- Seamless one-piece rotational molding — no seams, no welds, no leak points
- Manufactured by Norwesco — a leading name in rotomolded polyethylene tanks
- Large tanks require professional installation. Ensure the pad is level within 1 inch across the full diameter and that all piping connections allow for thermal expansion
- Ships via dedicated freight carrier due to oversized dimensions — contact us for delivery timeline and site access requirements
Installation and Setup Guide
At over forty tons full, the 6500 is a major structural installation where the foundation, access, and plumbing must all be planned and engineered in advance. The wide base helps with pad pressure, but the absolute load is enormous and unforgiving of a poor foundation.
Site Preparation
This tank requires a reinforced concrete foundation designed by a structural engineer for the full 82,605-pound load and sized to support the entire 119-inch base. The slab must be flat across the full diameter within a tight tolerance — at this weight, a high spot creates a severe stress concentration in the lower wall. Coordinate the pad, truck access, and heavy offloading equipment together well before delivery; this is not a tank you can reposition by hand once it lands.
Placement and Connections
Set the tank so the 3-inch siphon outlet faces your transfer system with the shortest practical run. Use schedule-80 PVC or stainless on the bulkhead, hand-tighten with a strap-wrench finish, and add a flexible section before rigid pipe to absorb the large thermal movement of a tank this size. Build permanent, safe access to the 16-inch lid and leave generous clearance for inspection all around.
Venting
Moving thousands of gallons through a 3-inch line shifts huge volumes of air, so generous venting is essential — an undersized vent will crease the wall under vacuum or stress it under pressure. Provide a large vent sized to your maximum flow rate, and for any off-gassing chemical use a pressure-vacuum relief vent rated for the product.
Maintenance and Long-Term Care
A tank representing this much stored value justifies disciplined inspection. Use the permanent access you have built and fold these checks into plant rounds.
Quarterly Inspection Checklist
- Lower wall: The base ring carries the highest stress; inspect it closely for bulging, distortion, or a flat spot against the slab.
- Outlet: Check the 3-inch fitting and siphon for weeping under the large head and snug by hand.
- Foundation: Examine the engineered slab for cracking or settlement and confirm it stays level under the wide base.
- Vent: Verify the large vent is fully clear; at this volume a blocked vent can deform the wall in one fast cycle.
Cleaning
Drain fully through the 3-inch siphon outlet, then flush the interior from your top access with a rinse that neutralizes the previous chemical. Follow the manufacturer's decontamination procedure and plan for handling the large rinse volume per its safety data sheet — at this scale, rinse capture and disposal are a scheduled operation.
UV and Weather Protection
A 150-inch wall presents a large south face to the sun; check it annually for chalking. Protecting the surface of a tank this large and valuable with a shade structure in severe-sun climates is a sound investment in its service life.
Alternatives and Comparisons
At 6,500 gallons the decision is volume strategy and footprint. This wide-base tank spreads its load well and consolidates storage into one foundation; multiple smaller tanks instead give redundancy and the ability to service one while another stays in use. A 6,000-gallon tank on a narrower base saves ground but raises pad pressure; a 7,800 steps volume up further. For batch processes needing a full drain at this scale, a large cone-bottom on a steel stand is the right tool. And for bulk water, the matching water tank costs less by carrying a lighter 1.1-SG wall instead of this 1.5-SG construction.
Frequently Asked Questions
How long will the 6500 Gallon Vertical Liquid Storage Tank - Natural White (119" x 150") last?
With an engineered foundation, operation within the 1.5 specific-gravity rating, and compatible chemistry, fifteen to twenty years is a sound expectation, and well-maintained tanks of this build often exceed it. The seamless shell and in-resin UV package make the vessel durable; what shortens it is an overloaded wall, a vacuum from inadequate venting, a chemical attack, or a foundation never designed for forty-plus tons.
What chemicals can I store in this tank?
At 1.5 SG it accommodates most liquid fertilizers, agricultural chemicals, and a broad range of industrial acids and bases up to 12.5 pounds per gallon. Polyethylene handles those well, but strong oxidizers and many solvents attack it, and it must never store flammable fuels. Given the volume, confirm your product on a poly compatibility chart and verify its specific gravity before filling.
What kind of foundation does a 6500-gallon tank need?
A full load is roughly 82,605 pounds, requiring a reinforced concrete foundation engineered by a structural professional for your soil and sized to support the full 119-inch base. The wide base lowers pad pressure but the absolute load is enormous — a dead-level engineered slab is essential.
Does this tank come with a warranty?
Yes — a three-year Norwesco warranty covers material and workmanship defects: pinholes, molding defects, and defective factory fittings. It excludes overloading past 1.5 SG, chemical attack, an inadequate or non-engineered foundation, and impact damage. Keep your invoice and installation paperwork on file for any claim.
Can I install this tank underground?
No. This is an above-ground vertical tank; its flat walls cannot withstand burial pressure and would collapse. For below-grade storage at this scale, use vessels engineered with ribbed, reinforced walls for soil and groundwater loads.
Buying Considerations
Plan three things before ordering this large tank. First, the foundation — over forty tons full requires a professionally engineered reinforced slab specified ahead of delivery. Second, access and offloading — at 1,290 pounds empty and twelve and a half feet tall, it ships by dedicated freight and needs heavy equipment and clear access to set. Third, the contents — keep them at or below 1.5 specific gravity and confirm the product's weight. Call us early to coordinate delivery and site requirements.
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