Snyder Industries 275 Gallon ASTM HDPE Black Double Wall Tank

A 47 inch base on a finished floor, and no bund to build

Where this tank sits is the whole argument for it, so take the floor first. The base is 47 inches square, a shade under four feet each way, and the tank stands 63 inches to the top of the manway. That proportion is deliberately squat: the load is spread over a wide footprint instead of being concentrated, the centre of gravity is low, and the top is barely over five feet, which means an operator can see into the manway from a single step rather than from a platform. On a busy floor that is worth more than the gallons. The surface underneath still has to be right. Flat, continuous, level and carrying the whole 47 inch footprint, with no rocking and nothing packed under one corner; above it sits 2,294 pounds of water and 4,358 pounds at the published 1.9 rating. What the wide base buys you is tolerance rather than permission, and a slab that is out of level is still out of level under a low tank. The reason a site chooses this instead of a single wall vessel is the second thing worth being plain about. Containment comes with the tank rather than being constructed around it, which means no kerb, no coating, no drainage detail and no bund volume argument on a floor that was poured for something else. It also means the containment moves when the tank moves, which matters on a leased site or a plant that reconfigures. Four feet square will pass most roller shutters and many internal doorways, so this is a vessel that can genuinely be sited indoors and then re-sited later. Two engineering notes are worth reading before the order rather than after an inspection. A polyethylene wall's hardest service is at the vapour line rather than under the liquid, and the wall thickness at the vapour saturated headspace guide sets out why an inspection from the liquid side misses it. And where somebody asks how the space between two walls is tested, the cathodic disbondment testing guide for double wall interstitial spaces lays out that methodology and where the polyethylene boundary lies; this tank is polyethylene and stands above ground, and nothing here claims otherwise. Then settle the volume properly: the usable capacity and the real headspace are not the nameplate number on a contained tank, which is what the double wall freeboard sizing guide works through, and your own consumption belongs in the tank sizing calculator with the freeboard discipline from the tank sizing guide.

Three more 275s, a 250 and a 360

Four listings share this 47 by 47 by 63 inch shell at the same 200 pounds and differ on paper only in the name and colour the maker gives them: one named for sulfuric acid, two named as cross-linked with one of those black, and this one named as high density and black. No sheet explains what those names imply and this page will not invent an explanation. Describe the product, the strength and the duty to us and we will name the part number; that is the honest route and it takes one phone call. Colour is the one difference you can see working. A black wall keeps daylight out of the contents, which matters wherever the vessel stands in a lit bay or near a window, and it costs you the ability to read the level through the shell that a white listing gives. On a tank whose only published opening is the manway on top, that is a trade to make deliberately. The other two rows are the real size decision and they pull in opposite directions. 5990502N42 holds 250 gallons, only twenty-five fewer than this one, but does it on a 34 inch plan by standing 83 inches tall at 150 pounds: far less floor, far more height, and a lid well above head height. 5760102N30 holds 360 gallons at exactly the same 63 inch height on a 53 inch plan at 250 pounds, so it buys a third again as much volume for six inches more in each direction on the floor and no change at all to how you reach the top. If your ceiling is the constraint, look hard at that 360 before you settle here. If the floor is the constraint, the tall 250 is the one to price.

Still deciding between these? Freight to your ZIP often settles it; the wider tanks ship differently. Or call 866-418-1777 and we will walk the table with you.

The outlet field, the 18 inch manway, and what is not on the sheet

• The outlet field: it reads "1 Manway / Lid" and nothing more. That is the name of an opening, not a pipe size, and the inlet field is blank. No outlet dimension, thread, bulkhead, flange or valve is published on this sheet and none is claimed here. Give us the duty, the line size and the pump and we will confirm what this part number carries before anything is ordered.
• The manway: 18 inches, threaded and vented, is the only opening the sheet publishes. Eighteen inches is generous enough to get a proper look inside, to work a lance and to change out a drop pipe, which is not true of the smaller lids elsewhere in this range.
• Reaching it: the top is at 63 inches, so a single step serves where a tall vessel of the same volume would want a platform and a fall protection arrangement. Bring the delivery coupling down to working level rather than making a driver climb.
• The vent: the manway is listed as vented, and that path is the wall's protection on a fast delivery and on a hard pump-down. Keep it clear, look at it whenever the manway is open, and never restrict it to hold an odour.
• The space between the walls: no monitoring port, gauge or alarm is published. Specify how that space will be watched and recorded; it is the part of a contained tank worth writing a procedure for.
• Structure: the sheet publishes no lifting lugs, no ladder lugs and no flange lines on this part number.
• 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.

Tell us the product when you order. Every wetted part on a contained vessel is chosen against the chemistry, and a fitting picked from a catalogue default is the part that fails on a tank that does not.

Where a black wall earns its place

Two hundred and seventy-five contained gallons on a low, wide base goes to duties that want the top reachable and the contents out of the light: chemical feed at a municipal water or wastewater works, a wash bay or vehicle wash dosing station, agricultural and horticultural chemical handling under a lit canopy, a metal finishing or plating line, a food, beverage or dairy cleaning chemical store, and any indoor point of use where a bunded floor was going to be the alternative. The black wall is the reason several of those pick this part number rather than a white one in the same shell. It is also a good size for a site standing one tank beside a skid rather than running a bulk programme: 275 gallons is enough to take a hose delivery and small enough that the vessel does not dominate the room. Keep a clear walking route right round it once it is set, because the side of a tank nobody can see is the side that leaks, and on a wide tank there is more of it.

Two hundred pounds on one pallet from Marked Tree

Marked Tree, Arkansas is the plant on this sheet and Arkansas the only ship-from state, which puts the mid-South and the lower Mississippi valley on a short lane. Freight is LTL at class 250, the sheet lists no NMFC number, and the shipping size is given at 47 by 47 by 63 inches at 200 pounds. Price your own lane with the freight cost estimator; the listed price is before freight. The constraint at your end is width rather than height: a pallet nearly four feet square wants a proper doorway and a straight run to its final position, so walk the route and measure the narrowest point before the truck is booked. Take it off under the base with forks or a pallet truck, never with a strap round the body and never by the manway. Set it on the finished, level surface where it is going to live before a single pipe is connected, because a wide tank is not shuffled sideways once it is plumbed. Fill it with clean water, hold that 2,294 pound load, and read the manway seal, the base all the way round and the surface under it. Drain it and let it dry, then open the space between the walls, look at it in good light and write the date on the shell. Photograph the base line from two sides while the tank is still empty; a settling slab is far easier to compare against a picture than against a memory. Write the outlet fitting size and material on the site plan; the replacement is ordered by those two words.