310 Gallon 30 Degree Cone Bottom Tank with Poly Stand: Complete Buyer's Guide
Ten more gallons than its 300-gallon sibling, packed into a taller, narrower body — 72 inches of cone-bottom tank on a 43-inch base, with the poly stand included. The tighter footprint suits a crowded process floor, and the 30-degree cone still drains the full batch clean to its 2-inch tip.
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
At first glance the 310 Gallon 30 Degree Cone Bottom Tank with Poly Stand looks like a rounding error against a 300-gallon model, but the geometry tells a different story. This tank holds its 310 gallons in a narrower 43-inch diameter and a taller 72-inch body — trading floor space for height. On a crowded process floor where width is the scarce resource, that slimmer footprint is the reason to choose it.
The taller column changes the working details. The 30-degree cone still drains the full batch completely to the tip, but the lid sits higher on the included stand, and the deeper liquid column puts more hydrostatic load on the lower wall. The shell is light at 121 pounds empty; filled to 310 gallons at the 1.5 specific-gravity rating it reaches about 3,999 pounds — right at two tons — all funneled through the cone into the matched polyethylene stand that ships with it.
A 2-inch NPT outlet at the cone tip drains the batch or feeds a pump cleanly. This model carries an 8-inch lid rather than a wide 16-inch opening — a charging and inspection port suited to a taller, narrower tank where you meter chemical in rather than mount large agitation across the top. The translucent white wall keeps the level readable up the tall column, the seamless Norwesco mold leaves no weld seam, and the all-poly stand resists corrosion in the chemical-splash zone.
This is chemical-process equipment rated to 1.5 specific gravity — built to batch and meter agricultural and industrial solutions, not to store drinking water — with Norwesco's 3-year manufacturing warranty.
Technical Drawing
Official Norwesco technical drawing — 310 Gallon 30 Degree Cone Bottom Tank with Poly Stand
Key Features and Specifications
- 310-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
- 72" tall x 43" diameter — compact vertical footprint
- 121 lbs empty, approximately 3,999 lbs when full at rated specific gravity
- 2" NPT outlet fitting — factory installed and leak-tested
- 8" 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 LTL freight on a pallet — residential delivery with lift gate available
Installation and Setup Guide
The included stand handles the load rating; the taller, narrower geometry just asks for a little more attention to stability and overhead.
Assembling and Siting the Poly Stand
Assemble the polyethylene stand on a hard, level surface and confirm it is square before seating the tank. The stand is rated for the full charge — about 3,999 pounds at 1.5 specific gravity — so the rating is solved, but a tall, narrow tank has a higher center of gravity than a squat one, making a dead-level floor and a stable base more important, not less. Reinforced concrete suits the near-two-ton load. Cradle the cone fully with the tip hanging free; the apex carries the 2-inch outlet and never bears weight.
Plumbing the 2-Inch Outlet
Plumb the 2-inch NPT cone-tip outlet with a full-port valve and a short run. The taller 72-inch column gives the 30-degree cone extra head pressure to clear the batch quickly, so keep the drain path full-bore and unrestricted. Allow for thermal expansion and take the first connection in chemical-rated flexible hose, since the tall column moves the fittings noticeably with temperature.
Ventilation and Charging
The 8-inch lid is a charging and inspection port, well suited to metering chemical into a tall tank rather than mounting wide agitation. Charge in a ventilated area, reseat the lid before any in-tank mixing, fit a vent matched to the chemistry, and keep eyewash within reach. Integrate the station into spill containment as you would any chemical vessel.
Maintenance and Long-Term Care
A tall, narrow batch tank shifts a little attention to stability and the lower wall, on top of the usual cone and valve care.
Between-Batch Inspection
- Cone evacuation: Confirm the 30-degree cone drains to a dry tip. The taller column helps push the batch out, so a residual heel points to a fouled tip valve or a stand drifting off level.
- 2-inch valve: Cycle the full-port tip valve and inspect the seat for wear.
- Stability and stand: Confirm the tall tank still stands plumb and the poly stand is square with all feet bearing — a higher center of gravity makes a settled corner more consequential here.
- Lower-wall survey: Backlight the lower third of the tall column, where hydrostatic load is greatest, looking for crazing, bulging, or swelling.
Decontamination Between Chemistries
Flush and decontaminate the tank, cone, and 2-inch outlet to the chemical manufacturer's procedure before changing products. A 310-gallon vessel holds residue in the cone and piping; a thorough decon protects the next batch. This is process equipment and is never returned to potable service.
Long-Term Care
Kept out of direct sun, both tank and poly stand age slowly, and the stand will not corrode — an advantage over steel in chemical service. The watch items are floor level under the tall, loaded tank, the tip valve, and the lower-wall hydrostatic zone. Keep a spare valve and gasket on hand.
Alternatives and Comparisons
The 310 Gallon 30 Degree Cone Bottom Tank with Poly Stand is best understood against its near-twin 300-gallon model: same capacity class, different footprint.
Tall-and-narrow vs. squat-and-wide: This 43-inch-diameter, 72-inch-tall tank trades floor space for height — the right choice when width is constrained on a busy process floor. A wider, shorter 300-gallon cone of similar capacity stands lower and more stable but eats more floor. Choose this one when the bottleneck is square footage; choose the wider model when it is overhead clearance or you want a lower center of gravity.
Bundled poly stand and cone advantage: Like the rest of the stand-included line, this unit ships with a polyethylene stand rated for the full near-two-ton charge, eliminating the undersized-or-rusting-stand mistake. The 30-degree cone gives the complete batch drainage a flat-bottom tank cannot — buy this for processing, not for static storage.
Other 310-Gallon Options
Frequently Asked Questions
How long will the 310 Gallon 30 Degree Cone Bottom Tank with Poly Stand last?
With compatible chemistries on its included poly stand and out of direct sun, the seamless shell readily exceeds 15 years, and the corrosion-proof poly stand will not rust beneath it. Because the tank is tall and narrow, the items to watch are floor level under the higher center of gravity and the lower wall's hydrostatic zone, alongside the usual 2-inch tip valve and gasket wear. Decontaminate between products and inspect after each batch for long service.
What chemicals can I store in this tank?
This is chemical-process equipment rated to 1.5 specific gravity, built to batch and meter agricultural and industrial solutions within that density — liquid fertilizers, surfactants, wettable powders, and water-based cleaning chemistries. It is not for drinking water and never for fuels, solvents, or flammables. Confirm every new product against a polyethylene compatibility chart, since some oxidizers and hydrocarbons attack poly.
What kind of foundation does a 310-gallon tank need?
The matched poly stand ships with the tank, engineered for the full charge of about 3,999 pounds at 1.5 specific gravity — right at two tons — so no separate stand rating is needed. Provide a hard, level surface (reinforced concrete suits this weight) that holds the load without settling, and pay extra attention to level because the tall, narrow tank has a higher center of gravity. Never rest the tank on its cone tip, which carries the 2-inch outlet.
Does this tank come with a warranty?
Yes — Norwesco's 3-year warranty covers material and workmanship defects in the tank when used within its ratings, including molding flaws around the 2-inch outlet. It does not cover chemical attack from an incompatible product, a cone damaged by tip-loading, a wall stressed by a settling or out-of-level floor, or normal valve and gasket wear. Keep your invoice and a photo of the tank correctly seated in its poly stand.
Can I install this tank underground?
No. The cone and stand are built for above-ground batch processing; a tall, narrow process tank is not engineered to resist soil and groundwater pressure, and the cone has no role underground. Burial would void the warranty and risk collapse. Keep the station above ground on its poly stand, and use a purpose-built underground tank with ribbed, reinforced walls for below-grade storage.
Buying Considerations
Before ordering the 310 Gallon 30 Degree Cone Bottom Tank with Poly Stand, settle three things. First, the footprint — this model's appeal is its narrow 43-inch base, so confirm you have the overhead clearance for a 72-inch tank on its stand and a dead-level floor for the higher center of gravity. Second, compatibility — verify your chemistries are poly-safe and within the 1.5 specific-gravity rating; this is a chemical mixer, not a water tank. Third, freight — the tank-and-stand bundle ships LTL on a pallet at 121 pounds (tank) plus the stand, so request a liftgate if you lack a dock or forklift. You receive a complete, ready-to-run batch station rather than a bare tank.
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