Snyder Industries 750 Gallon ASTM XLPE Black Double Wall Tank

The floor it stands on, and the door it has to pass

Start with the floor, because on a 73 inch square base everything else follows from it. Six feet each way is real estate in a plant room, and the surface under it has to be flat, continuous and level across the whole footprint: not two rails, not a timber pallet left in place, not a shim at one corner. Above that surface sits 6,255 pounds of water at 8.34 pounds per gallon, and 11,884 pounds at the published 1.9 rating. That is a concentrated load for an indoor slab and it is worth confirming with whoever owns the building before the order goes in, because a contained tank that has to be moved later is a contained tank nobody wants to move. The second constraint is the route. A 73 inch object does not pass a standard 36 inch doorway, so the way in is a roller shutter, a bay door or a wall opening, and it needs a straight run with turning room at the end. Measure the narrowest point on that route, not the widest, and measure it before the truck is booked rather than on the morning it arrives. Height is the easy part here: at 67 inches this tank stands a little over five and a half feet, so a 96 inch ceiling leaves working room above the manway, and overhead pipework, lighting and sprinkler heads are usually clear. That low, wide proportion is the whole character of this size. It buys stability, it puts the opening within reach of a modest step rather than a fixed ladder, and it pays for both in floor area. Forklift clearance is the third thing to settle on the site walk. The tank is taken under the base with forks or a rated sling arrangement, never by the manway, so there has to be room to approach it square, set it down and back out. Leave a walkway all the way round the finished position as well. The side of a contained vessel that nobody can see is the side that develops a weep, and on a six foot square tank pushed into a corner that is two of the four sides. Two sizing questions belong before the order and not after it. The volume you can actually use is not the nameplate figure once thermal expansion and product density are accounted for, so work your delivery quantity and your turnover through the tank sizing calculator, and take the freeboard discipline from the tank sizing guide before you settle on 750 gallons rather than the size above or below it.

Four 750s, a 550 and a 1000

Four listings share the identical 73 by 73 by 67 inch shell at the identical 390 pounds, and the only published difference between them is the name and the color the maker assigns. This page offers no interpretation of either, because a product name is not a specification and reading one out of a suffix is how the wrong vessel ends up in a plant room. Tell us what you are storing and at what strength, and we will tell you which part number to order. Colour is the one difference with an observable consequence: a black wall keeps daylight out of the contents, while a natural shell lets an operator read the level through the wall in a lit room. The two rows that are genuinely different sizes are where the real decision sits, and this family scales oddly. The 550 gallon 5040000N30 is the wider tank of the two at 76 inches square, not the narrower one, and it gets its smaller volume by standing shorter at 65 inches and lighter at 315 pounds. So stepping down from this tank costs you volume and buys you almost nothing in floor. The 1000 gallon 5990102N30 goes the other way for very little: 81 inches square and 69 inches tall at 500 pounds, so a third more volume for well under a foot more in each direction. If the floor plan can take a 81 inch square and the budget can take the step, the larger row is usually the better buy per gallon stored. This 750 is the right answer when the bay is already measured, the door is the limit, or the delivery quantity genuinely lands at this volume rather than the one above it.

Two rows look the same? The difference is the wall; call 866-418-1777 with the liquid and we will say which, or ask for a quote on both.

The outlet field reads 3/4

• The outlet: this sheet lists the outlet as 3/4. That is the field value and we print it as it stands. It is the only tank in this group whose outlet field is not simply the opening, and the sheet gives no thread form, no connection type and no material for it. Before a pump, a valve or a discharge line is specified, tell us the duty and the line size you need and we will confirm what this part number actually carries.
• The opening: an 18 inch threaded vented manway on top. Eighteen inches takes a delivery coupling, a drop pipe and a rinse lance, and it is wide enough to get a proper look inside, which is not true of the small lids further down this family.
• Reaching it: the top of the shell is at 67 inches, so a step or a low platform serves where a taller vessel would need a fixed ladder and a fall protection arrangement. Bring the fill point down to working level if a driver is making the connection.
• The vent: the manway is listed as vented. That path is what protects the wall while a delivery pushes air out and while a pump draws the level down. Keep it clear, inspect it whenever the manway is opened, and never blank it to hold an odour.
• The space between the walls: the sheet publishes no monitoring port, no gauge and no alarm, and no inlet, and no stand or legs. None of those is claimed here. How that space gets watched and recorded is specified separately, and it is worth specifying.
• Limits: 120 F / 48 C, a specific gravity rating of 1.9, and a 3 Year Warranty. That is the whole of what this sheet publishes about service.

Name the product and its strength at order time. Every wetted part on a contained tank is chosen against the chemistry, and a second wall does nothing for a fitting that was picked from a catalogue default.

Bulk chemical holding where the floor is finished

Seven hundred and fifty gallons in a low, wide contained shell goes where the volume justifies a delivery but the floor underneath would make a release expensive: municipal water and wastewater dosing, food, beverage and dairy processing lines, boiler house and cooling tower chemical stations, plating and metal finishing shops, laundries and vehicle wash sites, and industrial process lines that dose steadily between deliveries. It is the size at which a site usually stops handling totes with a forklift and starts taking a hose delivery instead, and the second wall is what makes doing that indoors possible without building a bund around it.

Three pieces of engineering are worth reading before the order rather than after the first inspection. The usable volume and the real headspace are not the nameplate number, and the double wall freeboard sizing guide works that through on thermal expansion, chemistry and density. A polyethylene wall's hardest service is at the vapor line rather than under the liquid, which is why the wall thickness at the vapor saturated headspace guide explains what an inspection from the liquid side misses. And where somebody asks how the space between two walls is tested, the cathodic disbondment testing guide for double wall interstitial spaces sets out that methodology and where the polyethylene boundary lies; this tank is polyethylene and stands above ground, and nothing here claims otherwise.

Three hundred and ninety pounds out of Chowchilla

Chowchilla, California is the only plant on this sheet and California the only ship-from state, which puts the West Coast and the Southwest on a short lane and makes everything east of that a planned move. Freight is LTL at class 300 with no NMFC number, and the shipping size is listed at 73 by 73 by 67 inches at 390 pounds. Price the lane to your ZIP with the freight cost estimator; the listed price is before freight. The constraint at delivery is width rather than weight: 390 pounds is a light object for its bulk, but a six foot square shipment needs a proper opening and a straight run to its final position. Take it under the base, never by the manway, and set it on the finished, cured, level surface in its final position before a single pipe is connected, because a tank this wide is not shuffled sideways once it is plumbed. Fill it with clean water, hold the 6,255 pound load, and read the manway seal, the base all the way round and the surface under it in that order. Leave the water in overnight where the schedule allows. Then drain it, let it dry, open the space between the walls, look at it in good light and write the date on the shell; that first look is the baseline every later inspection gets compared against. Mark the part number on the shell in paint marker the same day, because the tank will outlast the people who ordered it. Mark the vent and the outlet on the outside of the shell so nobody caps the wrong one in the dark.