The largest vertical liquid tank in this batch: 7,800 gallons standing over fourteen and a half feet tall, holding nearly fifty tons of chemical or fertilizer when full. This Norwesco vessel on a 119-inch base carries a 3-inch siphon outlet for high-volume transfer and a 1.5-specific-gravity wall rated 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.

Manufacturer	Norwesco
Manufacturer Part #	N-40663
Nominal Capacity	7800 Gallons
Footprint (Diameter)	119"
Overall Height	176"
Empty Weight	1606 lb
Material	Polyethylene (HDPE)
Color	White
Rated Specific Gravity	1.5
Certifications	IAPMO certified, CSA certified, FDA-compliant resin
Warranty	3-year limited (full replacement)
Shipping	OVS

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 7800 Gallon Vertical Liquid Storage Tank is maximum single-tank bulk storage in the vertical line — 7,800 gallons on a 119-inch base, reaching a towering 176 inches to pack the volume into a ground footprint the diameter alone could not hold. It is the choice for a large fertilizer dealer or industrial site consolidating bulk liquid into one engineered vessel.

Its scale shows in every spec. The outlet is a 3-inch fitting with a 2-inch reducer and a 3-inch siphon tube to move large volumes; the wide base spreads the load over 77.2 square feet; and the great height develops powerful outlet head for transfer and gravity feed. Translucent white walls still permit level reading and reflect heat across the tall, broad surface.

Empty, the tank weighs 1,527 pounds and is a rigging-scale lift. Filled with a 1.5-SG liquid it reaches about 99,105 pounds — nearly fifty tons that absolutely require a professionally engineered reinforced foundation. Top access is through the 16-inch lid. There is no factory inlet; a bulkhead is added to suit your plumbing.

Despite its size the tank is molded seamlessly, with UV stabilizer in the resin and Norwesco's 3-year defect warranty. Its dimensions require dedicated freight, rigging, and carefully planned site access, all of which we coordinate with you.

Technical Drawing

Official Norwesco technical drawing — 7800 Gallon Vertical Liquid Storage Tank

Key Features and Specifications

7,800-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
176" tall x 119" diameter — compact vertical footprint
1527 lbs empty, approximately 99,105 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 nearly fifty tons and over fourteen and a half feet, the 7800 is the most demanding installation in the lineup — maximum height combined with maximum single-tank load. The foundation must be engineered and the rigging, access, and plumbing planned in detail before the tank ships.

Site Preparation

This tank requires a reinforced concrete foundation designed by a structural engineer for the full 99,105-pound load, the high pad pressure of the 119-inch base, and your specific soil. The slab must be flat across the diameter within a tight tolerance — at over fourteen feet, the smallest tilt becomes a serious lean and an uneven load on the lower wall. Plan the pad, crane or rigging access, and the heavy set as one coordinated operation.

Placement and Connections

Orient the 3-inch siphon outlet toward your transfer system and keep the plumbing run short. Run schedule-80 PVC or stainless to the bulkhead, snug by hand and finish with a strap wrench, and place a flexible section ahead of rigid pipe to take up the large thermal movement and any column sway. Build permanent, caged access to the lid over fourteen feet up, and evaluate wind restraint for the site.

Venting

High-volume transfer through a 3-inch line moves enormous air volumes, and a very tall wall is especially prone to vacuum creasing. Install a large vent sized to your peak flow, and use a pressure-vacuum relief vent rated for any off-gassing chemical.

Maintenance and Long-Term Care

This tank's value and height both demand disciplined, scheduled inspection using the permanent access built into the installation.

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Quarterly Inspection Checklist

Plumb and lower wall: Sight up the fourteen-foot column for any lean, and inspect the high-stress base ring closely for bulging or distortion against the slab.
Outlet: Inspect the 3-inch fitting and siphon for seepage under the powerful head this height creates.
Foundation: Check the engineered slab for cracks or settling beneath the concentrated load.
Vent: Confirm the large vent is fully clear; a vacuum on this tall wall develops a crease quickly.

Cleaning

Drain completely through the 3-inch siphon outlet and flush from the top with a rinse that neutralizes the last chemical. Follow the manufacturer's decontamination procedure, and handle the large rinse volume per its safety data sheet as a planned operation.

UV and Weather Protection

A fourteen-and-a-half-foot south wall takes a heavy annual sun load, so check it for chalking each year. In severe-sun climates, protecting this very large, costly shell with shade on the sunny side is a worthwhile investment.

Alternatives and Comparisons

At 7,800 gallons the decision is consolidation versus redundancy and footprint. This single tall tank maximizes volume per foundation and develops strong outlet head, ideal where ground is tight and overhead is available. A wider, shorter large tank eases pad pressure and access at the cost of footprint; multiple smaller tanks give redundancy and let you service one while another works. For full-drain processing at this scale, a 7,500-gallon cone-bottom on a heavy stand is the right tool. And for bulk water, a black water tank costs less by carrying a lighter 1.1-SG wall than this 1.5-SG build.

Frequently Asked Questions

How long will the 7800 Gallon Vertical Liquid Storage Tank last?

Given an engineered foundation, use within 1.5 SG, and compatible chemistry, fifteen to twenty years is a reasonable expectation. The seamless shell and in-resin UV package make the vessel durable; the failure modes to guard against are an overloaded or vacuum-creased wall, a chemical attack, and a foundation or restraint inadequate for a fourteen-foot, fifty-ton tank.

What chemicals can I store in this tank?

With a 1.5-SG rating it covers most liquid fertilizers, ag chemicals, and many acids and bases weighing up to 12.5 pounds per gallon. Polyethylene withstands those, yet strong oxidizers and many solvents corrode it and fuels are never suitable. Before the first fill, confirm compatibility on a polyethylene chart and check the product's weight.

What kind of foundation does a 7800-gallon tank need?

A full load is roughly 99,105 pounds at high pad pressure over the 119-inch base, which requires a reinforced concrete foundation engineered by a structural professional. At over fourteen feet of height, the slab must be dead-level across the diameter, and wind restraint should be evaluated for the site.

Does this tank come with a warranty?

Yes. A three-year warranty from Norwesco covers material and workmanship faults including molding and fitting defects. Not covered: loads over 1.5 SG, chemical attack, an inadequate or unengineered foundation, and impact or tip-over damage. File the invoice and a record of the installation for warranty purposes.

Can I install this tank underground?

No. As an above-ground vertical tank, its flat walls are not engineered to resist burial loads and would collapse. Below grade, use vessels built with ribbed, reinforced walls to handle soil and groundwater pressure.

Buying Considerations

Plan three things before ordering this largest vertical tank. First, the foundation — nearly fifty tons at high pad pressure requires a professionally engineered reinforced slab specified before delivery. Second, height, rigging, and access — at over fourteen and a half feet and 1,527 pounds empty, it is a crane-and-rigging set needing dedicated freight, clear access, and permanent caged lid access. Third, the contents — keep them at or below 1.5 specific gravity. Call us early to coordinate the foundation, rigging, and delivery.