Snyder Industries 250 Gallon ASTM XLPE Double Wall Tank

The floor it stands on, and why thirty-four inches matters

Start with the ground, because on a contained tank that is the decision everything else follows from. This one occupies a 34 inch square, a little under three feet each way, and stands 83 inches to the top of the lid. That is a great deal of held volume for very little floor, and it is exactly the trade you want in a plant room, a dosing bay or the corner of a bunded area that is already committed to something else. It is also the trade that puts the most demand on what is underneath. A tall vessel on a small base wants a flat, continuous, level surface carrying the whole 34 inch footprint, not two rails, not a timber pallet left in place, and not a shim under one corner. Above that surface sits 2,085 pounds of water, and 3,962 pounds at the published 1.9 rating; those loads arrive on three feet square rather than being spread out, which is why a floor that carries a wide tank comfortably is not automatically a floor that carries this one. If it is going anywhere other than a ground-bearing slab, that support is a calculation somebody signs, not an assumption. The second reason people buy this shape is the one nobody writes down until afterwards: it goes indoors. A 34 inch square passes a standard doorway with room either side, which means the tank can be delivered to a door, moved in on a pallet truck and set in its final position without hiring lifting equipment, and the containment travels with it. That is the practical difference between this and building a bund around a single wall tank in the same room. What you give up is reach. At 83 inches the lid is above head height for most people, so a step, a short platform or a permanent fill line brought down to working level belongs in the installation drawing rather than being improvised on the first delivery. Two sizing questions belong before the order and both have proper answers. The usable volume and the real headspace are not the nameplate figure on a contained vessel, and the double wall freeboard sizing guide works that through on thermal expansion, chemistry and density. Then put your own delivery quantity and turnover through the tank sizing calculator and take the freeboard discipline from the tank sizing guide. Where the reason for the tank is instead private fire water storage, that is a different duty on a different scale and the fire water reservoir design guide for rural and remote sites is where to start on it; nothing on this page is a claim about that use.

Four 250s on one shell, a 150 and a 275

Four listings share this exact 34 by 34 by 83 inch shell at the same 150 pounds, and what separates them on paper is the name and the colour the maker assigns. We print each name as the sheet gives it and explain none of them, because a product name is not a specification and reading one as though it were is how a plant ends up with a vessel that was never meant for its duty. Tell us what you are storing and at what strength, and we will tell you which of the four part numbers to order. That is a conversation, not a code to be broken out of a table. Two differences are real and observable. This listing is natural white, and a white wall lets an operator read the level through the shell in a lit room, which on a tank whose only opening is at 83 inches is often the only level indication anybody has; the black listings keep daylight out of the contents instead. And this sheet carries a service limit of 140 F / 60 C, where the black HDPE listing on the identical shell carries a lower one on its own sheet. Each page cites the figure printed against its own part number, and we never borrow a twin's. The last two rows are where the useful engineering choice sits. 5710102N30 holds 150 gallons on the identical 34 inch plan, simply shorter at 62 inches and 110 pounds, so moving down is a pure height decision with no floor consequence at all. 5740102N30 is the opposite kind of tank: 275 gallons, barely more volume than this one, laid out at 47 inches square and only 63 inches tall at 200 pounds. Same volume, opposite proportions, and the room decides. Measure the height you have and the floor you can spare before you choose.

Not sure which one? Tell us the liquid, the site and the ceiling height at 866-418-1777, or request a written quote with freight to your ZIP.

One opening: a 14 inch threaded vented lid

• The outlet field: it reads "1 Manway / Lid" and nothing else. That names an opening, not a pipe size, and the inlet field is blank, so no outlet dimension, no thread, no flange and no valve is claimed on this page. Tell us the duty and the line size you need and we will confirm what this part number actually carries before a pump is specified.
• The opening itself: a 14 inch threaded vented lid is the only one this sheet publishes, which makes it the fill route, the inspection route and the cleaning route at the same time. Fourteen inches takes a delivery coupling, a drop pipe and a lance; plan everything you want on top around one opening.
• Reaching it: the lid sits at 83 inches, above head height for most people. A step, a platform or a fill line brought down to working level is part of the job rather than an afterthought.
• The vent: the lid is listed as vented, and that path is what protects the wall while a delivery pushes air out and while a pump draws the level down. On a tall, slim vessel the level moves quickly for a given flow, so keep it clear and inspect it every time the lid comes off.
• The space between the walls: no monitoring port, gauge or alarm is published. How that space is watched and recorded is specified separately, and it is worth specifying, because the whole value of a second barrier is being able to show it is still empty.
• Structure: the sheet publishes no lifting lugs, no ladder lugs and no flange lines on this part number. Nothing is claimed beyond the moulding.
• Limits: 140 F / 60 C, a specific gravity rating of 1.9, and a 3 Year Warranty.

Name the product and its strength at order time. The lid seal, any fitting we add and the pump arrangement are all chosen against that chemistry, and on a contained tank the fitting is the one part of the system a second wall does nothing for.

Dosing rooms that cannot spare the floor

Two hundred and fifty gallons with containment built in is a point-of-use quantity rather than a bulk delivery one: a dosing or disinfection room at a small water or wastewater works, a treatment skid in a food, beverage or dairy plant, a boiler house or cooling tower chemical station, a pool and aquatics plant room, a laundry or vehicle wash, a plating shop, and pilot or laboratory scale work standing on a finished floor. What those sites share is a room with no space for a built bund and a floor where a release would go somewhere expensive. This shape answers both at once: one item to buy, one footprint to find, and nothing to construct. Two hundred and fifty gallons is also the point at which many sites stop moving totes with a forklift and start taking a hose delivery instead, and doing that indoors is precisely what the second wall makes possible. One habit pays for itself from the first week: look into the space between the walls on a fixed schedule, write down the date and what you saw, and keep that record with the tank.

Class 250 out of Lincoln, Nebraska

Lincoln, Nebraska is the only plant on this sheet and Nebraska the only ship-from state, which is about as central a lane as this catalogue has: the plains and the Midwest are close, either coast is a planned move. Freight is LTL at class 250 with no NMFC number listed, and the shipping size is given at 34 by 34 by 83 inches at 150 pounds. Price the lane to your own ZIP with the freight cost estimator; the listed price is before freight. One pallet position and 150 pounds means a pallet truck rather than a crane at your end, but the height is what needs planning: measure every doorway, lintel and overhead run on the route, because a tank standing nearly seven feet on the floor is taller again sitting on a pallet. Take it under the base, never by the lid. Set it on the finished, level surface in its final position, check it is plumb in two directions and secure it against being knocked before anything is plumbed in. Then fill it with clean water, hold that 2,085 pound load, and read the lid seal and the whole base in good light. Drain it, let it dry, open the space between the walls and record that first inspection on the shell in paint marker along with the part number. Everything you check in later years gets compared against that reading, and a tank that never had one is a tank nobody can prove anything about. Chalk the full-water line on the outside after the first fill; it is the level every later reading gets checked against.