Double Wall Tanks

Double Wall Storage Tanks

Double wall storage tanks (IMT) provide the best protection against hazardous chemical spills into the environment. The inner tank dome overlaps the outer tank sidewall to help prevent rainwater, snow, and debris from entering the containment basin, making them among our most safe tanks. Molded-in upper and lower fitting flats are standard. We can customize these tanks with either a top suction or sturdy designed bottom outlet. All double wall containment tanks are designed with wall thicknesses equal to or greater than that required by ASTM D-1998 standards.

Need a large double wall tank?

Assmann’s IMT 8850 will accommodate two truckloads of most chemicals. Some of the unique features of this containment tank are a standard 24″ hinged manway opening and a secure secondary containment. The secondary containment portion of this tank contains over 110% of the primary tanks capacity. The IMT 8850 can also be equipped with Assmann’s double wall tank accessories.

— System consists of a primary inner tank and a secondary, locked-on outer tank
— Ideal for outdoor storage of chemicals
— Provides individualized secondary containment and prevents cross-contamination of reactive chemicals

Common Use

Double wall plastic tanks provide the best protection against spills, making it a safe tank for your chemical storage needs. Trust Assmann polyethylene tanks to hold your hazardous materials.

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Large Double Wall Tank Specifications

Linear Polyethylene

Model
Number		 CAD Capacity
(US
Gals)		 Dims
(in)		 Weight (lbs)
Linear Polyethylene		 Access
Opening
(in)
Pri Sp. Gravity Sec Sp. Gravity
Dia Hgt 1.5 1.9 2.2 1.5 1.9 2.2
IMT150 CAD 1504744N/A6582N/A65827/16
IMT250 CAD 2504761N/A95110N/A951107/16
IMT550 CAD 5506073N/A130151N/A13015916
IMT625 CAD 6254711311715217612716219116
IMT1050 CAD 1050728718520523319124428316
IMT1550 CAD 15507212328335941630939245416
IMT2050 CAD 20507215955169180959674887516
IMT2100 CAD 21001237238047856340250959016
IMT2550 CAD 25509611945757967149963273216
IMT3050 CAD 305096138636806933694879101816
IMT4050 CAD 40509617711781492172811781492172816
IMT4400 CAD 440012312511431444168512081525178216
IMT5250 CAD 525011915412301558180413421699196816
IMT6550 CAD 655011918620282569297420282569297416
IMT8850 CAD 885014317331123942456532094065470624

Crosslink Polyethylene

Model
Number		 CAD Capacity
(US
Gals)		 Dims
(in)		 Weight (lbs)
Crosslink Polyethylene		 Access
Opening
(in)
Pri Sp. Gravity Sec Sp. Gravity
Dia Hgt 1.5 1.9 2.2 1.5 1.9 2.2
IMT150 CAD 1504744N/A6582N/A65827/16
IMT250 CAD 2504761N/A95110N/A951107/16
IMT550 CAD 5506073N/A130159N/A13015916
IMT625 CAD 6254711311715217612716219116
IMT1050 CAD 1050728718520522617622125616
IMT1550 CAD 15507212327938044028335941616
IMT2050 CAD 20507215950563373854569779916
IMT2100 CAD 21001237238047856340250959016
IMT2550 CAD 25509611960074886645757967116
IMT3050 CAD 305096138739944109363680693316
IMT4050 CAD 40509617711581476170011781492172816
IMT4400 CAD 440012312511431444168512081525178216
IMT5250 CAD 525011915413721753202512301558180416
IMT6550 CAD 655011918620002570296020282569297416
IMT8850 CAD 885014317328533614418429423726431424

Small Double Wall Tank Specifications

Model
Number		 CAD Capacity
(US
Gals)		 Dims
(in)		 Weight (lbs) Weight (lbs) Crosslink Polyethylene
Pri Sp.G Sec Sp.G Pri Sp.G Sec Sp.G
Dia Hgt 1.5 1.9 2.2 1.5 1.9 2.2 1.5 1.9 2.2 1.5 1.9 2.2
IMT20 CAD 2026.12521.375N/A17N/AN/A17N/AN/A17N/AN/A17N/A
IMT40 CAD 4026.12533.5N/A26N/AN/A26N/AN/A26N/AN/A26N/A
IMT65 CAD 6526.12547.75N/A36N/AN/A36N/AN/A36N/AN/A36N/A
IMT85 CAD 8534.538.5N/A45N/AN/A45N/AN/A45N/AN/A45N/A
IMT120 CAD 12034.551N/A56N/AN/A56N/AN/A56N/AN/A56N/A
IMT165 CAD 16534.566N/A69N/AN/A69N/AN/A69N/AN/A69N/A
IMT405 CAD 4054776N/A7482N/A7790N/A7477N/A7782

Product Types

Assmann Double Wall Tanks are designed with wall thicknesses equal to or greater than that required by ASTM D-1998 standards. The tank wall thickness is calculated based on the bottom of each storage tank where hoop stress is greatest, then produced with uniform thickness throughout the entire wall.

Specific Gravity Options

Tanks are designed for 1.35, 1.5, 1.9 and 2.2 specific gravity chemicals.

Color Options

Available in natural color, blue, green, yellow or black.

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FAQs

Curious about Assmann storage solutions? Listed below are the most common questions about our Double Wall Storage Tanks. If you have additional questions about your next polyethylene storage tank, contact our experts.

How does the secondary tank contain the capacity of the primary tank?

If your primary tank fails, the content leaks into and fills the secondary tank, but the primary tank is still utilized as part of that containment basin while connected by the interstitial area. The secondary containment stops filling once the liquid level equalizes between the primary and secondary storage tanks.

How many bottom outlets can I put on a double wall tank?

Only one lower side wall fitting is allowed on our double wall storage tanks. The design of our double wall metallic fittings pulls the primary to the secondary wall, and with a gasket, seals them together as the fitting bolts down. If we were to put another fitting 180° around or 90° away from it, we would be pulling the tank in two different directions, causing one or both of those fittings to fail prematurely.

Do I need to install my own fitting on the tank?

No, when ordering your tank, specify what size connection you will need, and we will install it for you.

Related Accessories

Preserve the life and efficiency of your tank with accessories customized to your specific tank.

Leak Detection

Need interstitial monitoring? Designed with a NEMA 4X enclosure and suitable for both indoor and outdoor double wall tank applications. This system will alert you to a liquid in your containment.

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Heat Tracing & Insulation

Using different heat tracing elements, temperature can be maintained at any point above 50°F.

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Reverse Float Level Indicator

This gauge is designed to show liquid level in the tank without having chemical outside the secondary containment.

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Chemical Resistant Data

Maintain safety and efficiency with Assmann’s chemical resistant data chart.

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