Snyder Industries 7000 Gallon ASTM XLPE Vertical Storage Tank

The duty: a co-op filling from a tanker under a shed roof

Picture the yard this tank lives in. A co-op or a farm supply with a liquid fertilizer or a feed solution, a shed with open sides and a roof somewhere around ten feet, a tanker that backs in once a week in season and unloads most of its trailer in one go. Or a municipal plant storing hypochlorite in a low chemical building. Or a grower with irrigation makeup water and a pump house that was built for a pump, not for a tower. In every one of those the two constraints are the same: the roof is low and the ground is cheap, which is exactly the shape of this molding, and the chemistry sits at or near water weight, which is what the 1.5 rating on this sheet is for. The delivery is short and simple on a tank 122 inches tall. A stair and a small platform reach the manway, a permanent fill line lands there, and the driver is never above the height of the shed. What the wide base asks for in return is a real slab, because a rotationally molded floor bears on its own floor and nothing else: 58,380 pounds with plain water in it, or 87,570 pounds at the rating the sheet gives, all of it through a 142 inch circle. Pour it to the concrete pad sizing framework, level, cured, in full contact, and inside a berm sized to the tank where the liquid is regulated. Do not set it on compacted fill that has seen one wet season, and do not reuse a slab poured for a smaller vessel without checking it. An empty shell of 1,400 pounds on a twelve foot base is the easiest tank in this family to strap and the easiest to forget to strap, so band it while it is empty. Size the volume against the seasonal draw in the tank sizing calculator, and take the reserve and the thermal freeboard from the tank sizing guide.

Same low shell, lighter wall, and what the neighbours cost in height

Every molding in the top four rows holds 7,000 gallons in the same 142 by 122 inch shell, so the only question is how much wall the liquid needs. This one and the 5300700N46 are the 1,400 pound pair, each rated as its own sheet says, and a rating you never use is wall you paid for twice, once on the invoice and once on the freight bill. The 5300700N42 and 5300700N48 are the heavier pair at 1,900 pounds empty, which is the buy for a brine or a concentrate and the wrong buy for irrigation water. Leave the shell and you start trading floor for ceiling: the 7140000C26 holds 6,900 gallons on a 120 inch base at 153 inches, and the 7440000N40 takes 7,500 gallons into a 102 inch footprint at 234 inches for a plant that has height and nothing else. A 142 inch circle is the widest of the three and the reason this one fits where they do not.

Neighboring size a better fit? Every row links to its own page; freight to your ZIP is quoted on each, or call 866-418-1777.

Low-level protection matters most on a shallow tank

• Start with the pump, and specifically with what stops it. On a shell only 122 inches tall the last stretch of liquid is a big share of the volume and the head above the base connection is small, so the cutout device is not an accessory: a float switch or a probe wired to stop the pump before it draws air is what keeps the seal alive through a season of daily draws. Choose the set point off the pump curve, not off the bottom of the tank.
• Put the pump below the base connection, in a pit or on a low plinth, so gravity primes it and keeps it flooded through the whole working range. A pump on the same slab as the tank is working on almost nothing by the time the level is low, and on a seasonal duty that is when the demand is highest.
• Suction line: short, one size up rather than down, falling continuously to the pump, with no loop that can hold air after a shutdown. If the run has to be long, take the losses out of the pipe size rather than out of the pump.
• Outlet, printed exactly as published: the sheet lists the outlet as 28. It is the field and not a pipe size; no bottom fitting diameter, material, thread or gasket appears anywhere on this sheet, and none is invented here. Tell us the liquid, the flow and the pump you own at order and we confirm what the molding takes before anything is drilled.
• Access: an 18 inch threaded, vented manway at the top of a 122 inch shell, reached from a stair and a small platform rather than a tower, with a permanent fill connection landed there and a dip tube to the floor.
• Hardware as listed: ladder lugs and one flange line. Vent run outdoors on anything that fumes, sized to the delivery pump. Service limit 140 F / 60 C, warranty 3 year, rating specific gravity 1.5 as the sheet gives it.

Everything plumbed at the base rides on its own support off the pad with a flexible element between tank and hard pipe, because the shell is not a pipe anchor and a rigid run hands it every start and every temperature swing. Keep the manway threaded shut between deliveries, keep one liquid to one tank with its name on the wall where a driver can read it, and put a light on the band above the liquid line every time the cover comes off, for the reason the headspace wall thickness article explains. Where it freezes, insulate or trace the base piping and the first valve; the body itself takes ice from the top down.

Seasonal bulk under a roof that was never built tall

Liquid fertilizer and feed solution at a co-op, irrigation makeup water at a grower, hypochlorite at a small municipal plant, wash water at a packing shed: water-weight chemistry, bought in bulk, drawn hard for part of the year and sitting quiet for the rest. Where the site stores more than one grade of water and has to keep them separate, the industrial water reuse tank topology article is the guide to sequencing the storage rather than mixing it. Where a second wall is required by a rule or an insurer, the double wall freeboard sizing guide works out what containment really costs in usable gallons, and 110 percent is a design target rather than a label. A fire reserve is a different specification again, which the fire-water reservoir design guide covers for rural and remote sites.

Class 400 and a wide load off the Nebraska dock

The sheet gives class 400 and 1,400 pounds shipping weight out of Lincoln, Nebraska, and that pairing is worth understanding before the requisition goes in: a light tank with a large footprint prices on the deck space it occupies, not on what it weighs, and 142 inches across means the carrier handles it outside the trailer. Put your ZIP into the freight cost estimator and read the lane rather than estimating it; the listed price is before freight. A forklift with long forks or a small crane sets it with straps under the body, never a sling through the manway, and a wide base wants a spotter on the far side because the operator cannot see that edge. Water goes in before the working liquid, to the manway, held long enough to walk the base and the pad edge twice, then drained and dried, on the discipline in the hydrostatic test methodology article. Write the acceptance date on the manway collar with a paint marker; in five seasons nobody will remember it otherwise. Once it is full and holding, leave it alone for a day before the plumbing goes on; a settled tank is a quiet one.