At 7,500 gallons, this is the largest cone-bottom tank in the lineup — nearly forty-eight tons of full contents driven by a 30° cone to a 3-inch apex outlet for complete recovery. Standing 149 inches on a heavy engineered stand and spanning a 141-inch diameter, this Norwesco vessel is large-scale process equipment. Its wall, rated to 1.5 specific gravity, takes products up 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-40551
Nominal Capacity	7500 Gallons
Footprint (Diameter)	141"
Overall Height	149"
Empty Weight	1385 lb
Material	Polyethylene (HDPE)
Color	Natural White
Rated Specific Gravity	1.5
Certifications	FDA Approved
Warranty	3 Year
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 7500 Gallon 30 Degree Cone Bottom Tank is full-drain processing at the top of the rotomolded range. With a 141-inch diameter feeding a 30-degree cone, it funnels the entire 7,500 gallons and any settled solids to a single 3-inch apex outlet — the same total-recovery principle as a smaller cone, scaled up to a vessel that anchors a major blending or batch operation.

The defining elements at this size are the broad diameter and the structural stand. The wide 141-inch body holds enormous volume, and the 30-degree cone beneath it must be carried by a heavy engineered stand that takes the full load through the support ring, never the apex. Mounted, the tank stands 149 inches, elevating the 3-inch outlet for gravity discharge into downstream process equipment. Translucent white walls allow observation of level and mix across the large shell.

The tank shell alone is 1,385 pounds empty. Charged with a 1.5-SG liquid the tank and contents reach about 95,210 pounds — nearly forty-eight tons carried entirely through the engineered stand into designed footings. Filling, agitation, and access all go through the 16-inch lid. No inlet ships from the factory, and a heavy compatible stand is required.

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

Technical Drawing

Official Norwesco technical drawing — 7500 Gallon 30 Degree Cone Bottom Tank

Key Features and Specifications

7,500-gallon capacity — sized for full-drain mixing and batch processing
Constructed from virgin linear polyethylene (HDPE) with 1.5 specific gravity rating — handles liquids up to 12.5 lbs/gal
149" tall x 141" diameter — compact vertical footprint
1385 lbs empty, approximately 95,210 lbs when full at rated specific gravity
3" 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
Must be installed on the manufacturer-supplied or compatible stand rated for the full loaded weight. Never rest a cone bottom tank directly on its apex
Ships via dedicated freight carrier due to oversized dimensions — contact us for delivery timeline and site access requirements

Installation and Setup Guide

A 7,500-gallon cone tank is major process equipment, and its stand is a substantial engineered steel structure carrying nearly forty-eight tons. Every part of the installation — footings, anchorage, stand, tank setting, and access — must be engineered and planned in advance.

Site Preparation

A structural engineer must design the stand footings and anchorage for the full forty-eight-ton load and your soil conditions; this is not a slab-under-the-tank installation but a structural foundation for the stand. Set the stand dead-level so the wide cone hangs true and drains evenly across its full diameter. Plan footings, stand erection, the heavy tank set, and equipment access as a single coordinated operation.

Placement and Connections

Set the tank fully into the engineered stand's support ring and check the apex hangs clear before adding any liquid. Plumb the 3-inch apex outlet with a full-port valve so large-volume discharge and solids clear without bridging, using schedule-80 PVC or stainless and a flex section before rigid pipe. Build safe, permanent access to both the apex valve and the elevated lid.

Venting

Draining 7,500 gallons through a 3-inch line moves a tremendous volume of air, so a large, well-sized vent is essential to prevent vacuum creasing of the broad wall. Provide a lid vent matched to your maximum drain rate, and for any off-gassing chemical use a pressure-vacuum relief vent rated for the product.

Maintenance and Long-Term Care

A process tank of this size and value demands disciplined, scheduled inspection, with the structural stand always first on the list.

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Quarterly Inspection Checklist

Engineered stand: Inspect all members, welds, bolts, anchorage, and footings for corrosion, cracking, or movement under the forty-eight-ton load.
Cone and ring: Confirm even seating across the wide support ring and check for stress whitening at the cone shoulder.
Apex outlet: Confirm the 3-inch valve seals and drains cleanly, with no solids bridged above it.
Vent: Confirm the large vent is fully clear; a fast drain on a tank this size pulls a powerful vacuum.

Cleaning

Even at 7,500 gallons the cone makes cleanup efficient: open the 3-inch apex valve to self-drain almost the entire contents. Flush from the lid with a neutralizing solution, let the cone clear it, and repeat when switching incompatible products. Plan rinse handling and disposal at this volume per the product's safety data sheet as a scheduled operation.

UV and Weather Protection

The large, tall shell presents a substantial south wall; check it annually for chalking. Maintain the steel stand's protective coating against corrosion, and consider shade for the shell in severe-sun climates to protect this significant investment.

Alternatives and Comparisons

At 7,500 gallons the cone delivers what no flat-bottom tank can at this scale: complete drainage and solids recovery of a very large batch. The cost is a major engineered stand and elevated process plumbing. If your need is bulk storage rather than full-drain processing, a flat-bottom 6,500- or 7,800-gallon vertical is simpler and cheaper, accepting a residual heel. And if your batches are smaller, a 5,500-gallon cone reduces the structural and freight demands while keeping full-drain capability.

Frequently Asked Questions

How long will the 7500 Gallon 30 Degree Cone Bottom Tank last?

Fifteen to twenty years is realistic when the tank stays within its 1.5 specific-gravity rating, rides on a sound engineered stand, and holds compatible chemistry, and well-maintained process tanks often exceed it. The seamless mold and in-resin UV protection make the shell durable; at this scale the structural stand is integral to the tank's life. Overloading, a vacuum from inadequate venting, and chemical attack are the failure modes to prevent.

What chemicals can I store in this tank?

At 1.5 SG it suits most fertilizers, ag chemicals, and many acids and bases up to 12.5 pounds per gallon, and the steep cone makes it ideal for large batches of products that settle or need full recovery. Those store safely in polyethylene, whereas strong oxidizers, many solvents, and flammables do not belong in it. Look the chemical up on a polyethylene compatibility chart and confirm its density before you fill.

What kind of foundation does a 7500-gallon tank need?

The load rides through the stand, so the foundation is engineered footings and anchorage for a substantial steel stand — not a slab under the tank. A full load is about 95,210 pounds, so a structural engineer must design the footings and anchorage for that load and your soil, set dead-level so the wide cone drains true.

Does this tank come with a warranty?

Yes. The tank is warranted by Norwesco for three years against manufacturing defects in materials and workmanship. It does not cover exceeding 1.5 SG, chemical attack, apex-bearing the cone, an inadequate stand or footing, or impact damage. Hold on to the invoice and your installation records for any claim.

Can I install this tank underground?

No. This is an above-ground, stand-mounted process cone tank built for gravity drainage above grade; its geometry cannot survive burial. For below-grade storage at any scale, use purpose-built underground vessels engineered for soil loads.

Buying Considerations

Three things to plan carefully before ordering this largest cone tank. First, the engineered stand, anchorage, and footings — designed by a structural professional for nearly forty-eight tons. Second, the heavy set and access — at 1,385 pounds empty and over twelve feet tall on its stand, it is a rigging operation needing dedicated freight and clear access, plus safe access to the apex valve and lid. Third, the liquid: stay at or under 1.5 specific gravity. Call us early to coordinate the stand, rigging, and delivery.