Assmann Corporation of America
Assmann Storage Tanks at Siewert Equipment & F.R. Mahony
Durable, Chemical-Resistant Polyethylene Tanks for Bulk Storage Needs
Siewert Equipment and F.R. Mahony proudly offer Assmann Corporation’s premium polyethylene storage tanks—trusted for safely storing corrosive chemicals, acids, caustics, and other industrial liquids. These tanks are rotationally molded for exceptional wall integrity and resistance to cracking, impact, and UV degradation.
Assmann’s tanks are ideal for municipal water treatment, industrial process chemicals, wastewater treatment, and agricultural use. With over 40 years of experience, Assmann has become a go-to solution for customers needing reliable containment and long service life.
Built for Strength, Engineered to Last
Founded in 1980, Assmann Corporation has been manufacturing high-quality polyethylene storage tanks and containment basins for industrial and chemical applications. Known for long-lasting performance, Assmann offers a wide range of tank styles—including double-wall, vertical, conical bottom, and horizontal tanks—as well as custom-built solutions for tight or unique spaces.
In 2004, Assmann expanded with Assmann Southwest, a full-scale manufacturing facility in Marshall, Texas, equipped with advanced rotational molding technology for fast and efficient production.
What sets Assmann apart is its controlled molding process, using non-shielded molds, low-temperature heating, and gradual air cooling—a method that ensures consistent quality and long-term durability.
Today, Assmann remains a trusted partner for custom polyethylene tanks, backed by decades of engineering expertise and a commitment to quality without compromise.
Industries & Applications
- Municipal Water & Wastewater Treatment
- Chemical Processing & Bulk Chemical Storage
- Food & Beverage Processing
- Agricultural Fertilizer & Pesticide Storage
- Power Generation & Utilities
- Pharmaceuticals & Biotech
- Manufacturing, Pulp & Paper, Mining
Why Choose Siewert Equipment & F.R. Mahony for Assmann?
- Assmann distributors in NY & New England
- Chemical storage experts with local support and installation guidance
- Assistance with chemical compatibility and tank selection
- Factory-trained service teams and available accessories
- Secondary containment, fittings, and venting guidance
Assmann Product Offerings
Vertical Storage Tanks
- Single-wall and double-wall designs available
- Capacities from 40 to 12,000+ gallons
- Seamless rotational molding for structural integrity
- High UV resistance for outdoor storage
- Integrates with pumps, mixers, and level sensors
Double-Wall Tanks
- Built-in secondary containment to meet SPCC and local regulations
- Protects against catastrophic failure or environmental release
- Available with leak detection ports
Cone-Bottom Tanks
- Ideal for complete drainage and solids handling
- Used for blending, mixing, and sludge applications
- Available with steel or plastic stands
Open-Top & Mixing Tanks
- Easy access for batch processing and manual additions
- Can be used with mixers, agitators, and heating coils
- Available with hinged or bolted lids
Specialty & Custom Configurations
- Insulated tanks for temperature-sensitive storage
- Flame-retardant and FDA-compliant materials
- Custom fittings, flanges, manways, and overfill protection
- Horizontal leg tanks and transportable models
What Are Polyethylene Chemical Storage Tanks?
Polyethylene tanks are used to safely store and handle a wide variety of chemicals in both indoor and outdoor settings. Rotational molding allows for:
- One-piece, seamless construction with no welds or joints
- Even wall thickness for superior impact and chemical resistance
- Design flexibility for custom shapes, ports, and accessories
- Resistance to acids, bases, salts, oxidizers, and organics
- Compliance with ASTM D1998, NSF 61, and FDA requirements
Assmann’s use of high-density polyethylene (HDPE) and crosslinked polyethylene (XLPE) materials provides options depending on chemical type, temperature, and required tank longevity.
Full Service & Local Support
Siewert Equipment and F.R. Mahony support all Assmann tank installations with:
✔ Sizing guidance and layout planning
✔ Chemical compatibility review
✔ Accessory and fitting selection (vents, level indicators, pumps)
✔ Secondary containment strategies
✔ Field support for start-up and inspection
FAQ: Assmann Chemical Storage Tanks
What’s the difference between crosslinked and linear polyethylene?
- Crosslinked PE is stronger and more chemical resistant, ideal for aggressive applications. Linear PE offers more flexibility and is easier to weld.
Are Assmann tanks suitable for outdoor use?
- Yes. Tanks are UV stabilized for long-term outdoor exposure without degradation.
Do you offer double-wall tanks?
- Yes. Assmann’s double-wall tanks provide built-in secondary containment and meet SPCC requirements.
Can I store sodium hypochlorite in these tanks?
- Yes, with proper material selection and venting. Assmann offers tanks rated for NaOCl, HCl, H₂SO₄, and more.
Are custom fittings available?
- Absolutely. Manways, flanges, bulkheads, mixers, and level sensors can be added to suit your needs.
Can these tanks be used for food or potable water?
- Yes. FDA-compliant and NSF-61 certified models are available for food-grade or drinking water use.
What sizes are available?
- Standard capacities range from 40 to over 12,000 gallons, with custom sizes upon request.
Do you offer insulation or heat tracing?
- Yes. Insulated tanks are available, and Siewert or F.R. Mahony can recommend heating or freeze protection solutions.
Can I get a tank with a cone bottom for drainage?
- Yes. Cone-bottom tanks are ideal for complete emptying and are available with support stands.
Are your tanks certified or tested?
- Yes. Assmann tanks meet or exceed ASTM D1998, are ISO 9001:2015 certified, and tested for thickness, leak integrity, and performance.
Your Local Assmann Distributor
Siewert Equipment provides full support for Assmann chemical storage tanks across Upstate New York, including Rochester, Albany, Buffalo, and Syracuse.
F.R. Mahony supports Massachusetts, Rhode Island, Connecticut, Vermont, New Hampshire, and Maine, offering tank selection, delivery coordination, and after-sale support.
- New York (serving all Upstate NY) through Siewert Equipment, with offices in Rochester, and Albany.
- New England (serving all New England) through F.R. Mahony, with offices in Rockland, and Oxford.
Ready to Improve Your Chemical Storage System?
Contact Siewert Equipment or F.R. Mahony today to find the right Assmann tank for your chemical handling and storage requirements.
Trust Assmann for Durable, Compliant, and Chemical-Resistant Storage Tanks
Partner with Siewert Equipment or F.R. Mahony for expert tank sizing, venting guidance, and field support.
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