Snyder Industries 35 Gallon HDLPE Double Wall Dual Containment Storage Tank in White

The tank with no duty in its title, and when that is what you want

Look at the family and this part number explains itself. Four tanks share the 22 by 22 by 36 inch shell at 45 pounds. Two of them carry a liquid in the name: 1000112N30, which Snyder names for sulfuric acid, and the N52 tank Snyder names for outdoor sodium hypochlorite service. Two of them do not: 1000112N48 and 1000112N51 are described by resin and colour in black, and this one is described by what it is, a dual containment storage tank in white. That absence is the reason to buy it. A duty-named part number is the right answer when your liquid is the liquid in the name and the wrong answer when it is not, and plenty of small contained tanks are bought for a liquid nobody has written a name for: a blended product, a proprietary treatment chemical, a waste stream, a rinse concentrate, a feedstock that changes with the supplier. For those, the honest starting point is a tank described by its construction, a rating on the line, and a compatibility conversation with us before the order rather than a name on a page that nearly fits. So tell us the liquid, its temperature at the inlet, the temperature it sits at, and whether anything else has been in the drum it arrives in, and we will match the part number against Snyder's current documentation. The white shell is the second reason. On a contained tank, the outer shell is what you are looking at, and a white one is the only way anybody reads a level or sees the inner tank at all; the two black part numbers in the table below give that up in exchange for keeping light off the contents. Where it stands, the rules are short. Flat, level and continuous under the whole base, because a rotationally molded floor bears on what it touches and nothing else, and on a contained tank it is the outer shell doing the standing. On a slab, the pour matters more than people expect at this size, and the framework is in the concrete pad sizing guide. Before you settle on 35 gallons, run it against your real consumption and your delivery interval in the tank sizing calculator, and take the reserve you should never dip into, plus the freeboard a warming liquid needs, from the tank sizing guide.

The same 22 by 36 shell, sold four ways

Everything in the 35 gallon group is the same rectangle at the same weight, so read the table downwards for the one real size decision and sideways for the one real specification decision. Downwards: 5680002N42 holds 60 gallons in 26 inches by 26 inches by 41 inches at 55 pounds. That is a 26 inch base instead of a 22 inch one, 41 inches of height instead of 36, and 55 pounds instead of 45, for 60 gallons instead of 35, and on a feed tank the extra capacity usually buys a whole extra interval between deliveries. If this tank would run dry before the delivery truck comes, the answer is that row rather than a second tank in the corner, because one tank means one vent, one fill point, one containment space and one thing to inspect. Sideways: the four part numbers at 35 gallons differ by the name the maker prints and by colour, and by nothing else this sheet publishes. No wall figure, no dimension, no weight and no warranty separates them. That is worth being blunt about, because it means the choice cannot be made from a specification table; it has to be made from the liquid. Bring us the liquid and we will bring you the part number. Where the question behind the purchase is a site rule rather than a chemistry one, the difference between a tank that contains and a site that contains is worked through in the Captor double wall compliance walkthrough.

Height or floor the limit? The table has both shapes; freight to your ZIP is quoted on each row, or call 866-418-1777 with the site.

Breathing, filling and drawing through one six inch opening

• Start at the vent, because this sheet gives one opening and that opening is also the breathing path: a 6 inch threaded vented lid. Everything the tank does with air happens there. Draw it down with a metering pump and air has to come back in through that vent; fill it quickly and air has to leave through it. A small shell swings between pressure and vacuum faster than a large one, so an obstructed vent shows up as a deformed wall rather than as an inconvenience. Keep it clear and inspect it at every lid opening.
• Then the headspace. Do not fill to the lid; leave the liquid its expansion room and leave the vapour space above the liquid line intact. On a 36 inch shell that allowance is inches, which makes it easy to get wrong in both directions, and the sizing logic is set out in the freeboard sizing guide.
• Access: the same 6 inch opening is your fill point, your level check, your probe port and your only way into the inner tank, so it earns a clean thread, a clean gasket and a spare gasket on the shelf. A tank this size gets opened weekly in most installations.
• Outlet and inlet: the sheet publishes neither, so this page asserts neither. That is a specification to settle at order, not to assume: tell us where the liquid enters, where it leaves and what moves it, and the fittings get confirmed against Snyder's current documentation before a hole exists.
• Service limit and warranty: 120 F / 48 C, with a 3 year warranty as the sheet gives it, covering the liquid and the shell standing wherever it stands.
• Rating: a specific gravity of 1.9 with 555 pounds given as the maximum contents against 292 pounds of water. Those are the two numbers to quote, and no margin beyond them is claimed here.

On a dual containment tank the discipline that matters most is keeping the second wall a second wall. The inner tank holds the product. The outer shell exists for what the inner tank fails to hold, which means it is not a mounting surface, not a strap point and not somewhere to run a bracket; anything drilled, bolted or braced through it that Snyder has not specified has quietly undone the reason you bought the tank. Support the pipework off the floor or the wall on its own stand, put a flexible joint in the first connection so pump vibration and thermal movement stop at the stand, and leave every side of the tank reachable. Then use the containment space as the instrument it is. Look into it with a torch on a written schedule, keep it dry, and treat anything standing in it as information rather than as a nuisance to mop out. A small contained tank that gets looked into once a month will tell you about a problem long before the product does.

Small chemical feed where floor space is the whole constraint

A 22 inch square footprint is what this tank is really selling, and it is the reason a lot of them end up in places a bigger tank could never go. The duties: a metering or dosing feed in a plant room, a well house, a lift station or a booster station where the floor is already full; a cooling tower, boiler or closed loop treatment supply; a car wash, laundry, commercial kitchen or food plant chemical station; a small plating, print or finishing line drawing a working supply; a laboratory, pilot plant or test cell that needs a proper contained supply rather than a carboy on a bench; a waste or rinse collection point that has to be contained because of where it stands. The common thread is that the tank is part of somebody's room rather than part of a tank farm, and that the containment has to come with the tank because the room will not provide it. Two limits, said once. Nothing on this sheet gives a containment volume, an annulus dimension or an inner tank dimension, so this page will not tell you what proportion of the inner tank the shell holds; ask us and we will get it from Snyder in writing. And the published service limit is 120 F / 48 C, for the liquid and for the tank, which takes anything arriving hot off the table. Beyond that, the failures are always installation failures: a capped vent, hard pipe bolted to the shell, or a tank pushed into a corner where the containment space cannot be seen.

Arkansas and Mississippi, 45 pounds, and a shipment 36 inches tall

This tank is molded at Marked Tree, Arkansas and the sheet lists it shipping from Arkansas and Mississippi, which for most of the country is a short lane on a light item, and on a light item the lane costs more than the class. The freight fields themselves disagree, and both are printed as given: the sheet gives the freight class as UPS and the ship mode as LTL, on NMFC 156600, shipped 22 inches square by 36 inches high at 45 pounds. The freight cost estimator prices your ZIP, and the listed price is before freight. Tell us at order what the delivery point actually is, because a 45 pound shipment three feet tall can go to a dock, a shop door or a remote site and those are priced and handled differently. Two people take it off comfortably; one person takes it off badly. Walk the outer shell, the base and the lid seat with the driver before you sign, since a small shipment gets handled more times than a large one on the way to you. Commission it before it earns anything: fill the inner tank with clean water, let it stand where it will live, and look into the containment space before a drop of product goes in. Keep the delivery paperwork with the serial number off the shell, and put the first containment inspection on the calendar the same day the tank is plumbed. The vent screen is the cheapest part on the tank and the one that saves it; look at it every time the manway opens.