8000 Gallon Plastic Vertical Liquid Storage Tank in White

The duty is a full tanker and a plant that takes it in one drop

At 8000 gallons the duty changes character. This is not a tank somebody tops up; it is a tank a truck empties into. The buyers are a municipal water or wastewater works taking bulk treatment chemical on a delivery contract, a large food, beverage or processing plant holding process or wash water, an irrigation district or large grower buffering a canal turnout or a well against a pump, a mine or industrial site with a process solution, a fertilizer or ag retail terminal taking full loads to cut the truck count, a plant holding reclaim or reuse water between stages. The delivery is the thing to design around: a full tanker arriving on a schedule, offloading under pressure into the top of the tank, with an operator at the tank for the whole drop and a way to know the level before the hose is connected rather than after. Everything else follows from the size. Fifteen feet three inches of tank on a ten foot circle is a crane lift and a permitted load, not a forklift job, and it is a sail from the day it lands until the day it holds liquid, so cabling or banding to structure or to anchors set with the pad goes on before the first fill, tight, checked after the first windy week and again after the first full summer. The manway at 183 inches is a fixed platform with a rail, or it is a hazard. And the pad is the whole installation: 66,720 pounds of water, and more when the liquid is what the rating is for, standing on a 120 inch circle, carried by whatever the rotationally molded floor is touching and by nothing else, which is why the slab gets engineered to the concrete pad sizing framework for above-ground polyethylene tanks and inspected before the tank arrives rather than after. Level, in full contact, poured wider than the tank, inside containment sized to the tank where the liquid is regulated. Then size the duty honestly: run the draw and the delivery interval through the tank sizing calculator, because on a tank this big the wrong volume is an expensive pad as well as an expensive tank, and take the reserve and the thermal freeboard from the tank sizing guide.

The 8000s at 183 inches and 186, plus the 7900 and the 8500

Every tank on this sheet stands on the same 120 inch base, so the whole decision is height, wall and weight. This is the shortest of the 8000s by three inches at 183 inches, and the lightest of the group at 1,848 pounds, which is the buy when the purlin or the eave is the constraint and the wall on this sheet is the one the liquid needs. The three 5300600 shells reach 186 inches in cross-linked walls, one of them black for a liquid daylight degrades, and the sheet lists one of them at 2,300 pounds where the other two are 1,900; that is the sheet's own figure and we print it rather than explain it. Volume either side comes at a height cost in both directions: the 7370000N40 gives up a hundred gallons to come down to 177 inches, half a foot lower than this tank, at 2,700 pounds, and the 7400000N40 adds five hundred gallons by standing 194 inches, which is nearly a foot taller and a different platform. Each of those carries the rating its own sheet publishes, and this page asserts none of them.

Torn between two rows? Call 866-418-1777 with the liquid and the ceiling height, or ask for a quote on both and compare the freight.

A 3 inch outlet and the transfer pump under it

• The pump: 183 inches of shell puts better than fifteen feet of liquid over the base, the strongest suction head in this family, and a 3 inch outlet is what lets a pump use it. Mount the transfer pump below the outlet on its own base, with a short suction run falling toward it, and the column keeps the pump flooded to the last few inches and empties the tank in a working shift rather than a working day. A pump lifted level with the tank wastes the one advantage this shell has.
• Prime and protection: a cleanable strainer ahead of the pump, a check valve where the discharge lifts, and a low level float or probe that stops the pump with liquid still over the fitting. On a tank of this height the head falls away fast at the bottom of the shell, so the protection has to be automatic rather than procedural, because nobody is watching a gauge at the end of a long transfer.
• Outlet: a 3 inch polypropylene female NPT bulkhead fitting at the base, as the sheet lists it, and the largest outlet on this sheet. Under fifteen feet of standing liquid the thread gets made up once, correctly, and is then left alone: give it a flanged transition or a union a short way downstream so valves and pumps are changed there and never at the tank. Tell us the liquid at order and the fitting, the gasket and the bolting are specified against it.
• Fixed access with a rail for anyone who opens it, a dip tube for the fill rather than a free fall from that height, a vent run outdoors on anything that fumes and sized to the delivery pump, not to the tank.

What hangs off the outlet is where big tanks get hurt. A rigid pipe run bolted straight to the bulkhead and clamped to a building puts every degree of thermal movement and every pump start into the fitting, so the first joint is a flexible connector and the first valve rides on its own support off the pad. Put a kerb or a bollard between the fitting and anything that turns on the pad. Where the site freezes, trace or insulate the valve and the exposed run and leave the body to ice from the top down. And read the level from the ground: on a tank better than fifteen feet tall, climbing to answer a question a gauge answers is the risk nobody records until somebody falls.

Municipal storage, plant process volume and the fire reserve question

The work is bulk: treatment chemical storage at a municipal water or wastewater plant on a delivery contract, process and wash water at a large food, beverage or industrial plant, irrigation and canal buffering for a district or a large grower, mine and minerals solution storage, fertilizer and ag retail bulk at a terminal, and reuse or reclaim water held between stages of a plant water system. At 8000 gallons the tank is usually one of several, so the questions that matter are how the level is read, how the fill is metered and how the site behaves when one tank is out of service. Stored water is also frequently bought with firefighting in mind, and that is where the honest distinction belongs: a reserve is defined by draw rate, connection and freeze protection rather than by the number of gallons standing on a pad, and the fire-water reservoir design guide works through what it takes to make that claim real rather than nominal. This sheet's rating of 1.5 speaks to the weight the wall is built for and to nothing else, so the liquid still gets checked against the resin and the fittings before the order.

Merced, California, oversize, 1848 pounds empty

The SII-32455 is molded at Merced, California and ships at class 400 as the sheet lists it, as an oversize load. Ten feet across and better than fifteen feet long on the deck is a permitted load rather than a rate off a table, so the route, the gate, the overhead lines, the turn into the site and the place the truck can stand are all part of the purchase, and the freight cost estimator prices the lane to your ZIP with the listed price before freight. It comes off the deck on a crane or a large telehandler with slings under the body, never a hook through the manway, and it is stood up onto the finished pad in one operation with the cables or bands fitted before the machine leaves. Fill it with clean water to the manway once and hold it, watching the pad edge, the base and the outlet fitting through the hold, then drain and dry before the working liquid arrives. Have the pad signed off in writing before the delivery is booked; on a tank this size the pad is the only part of the job that cannot be fixed afterwards. The first fill is the only cheap time to find a problem, so do it in daylight with someone watching the base.