Specifying Sodium Hydroxide Storage: Six Decisions to Make with Your Distributor

September 16, 2026|
Assmann Corporation

A Better Specification Starts with Better Inputs

A Sodium Hydroxide storage project is not simply a choice between tank sizes. The storage system must reflect the chemical, delivery conditions, facility climate, layout, containment requirements, and operating practices. A distributor can help gather those inputs and bring the right questions to Assmann before the tank is built.

The following six decisions create a practical starting point.

1. Confirm Capacity and Working Volume 

Document both the required storage capacity and the normal working volume. The answer should reflect delivery quantities, operating consumption, available space, and the facility’s preferred reserve. Assmann manufactures Sodium Hydroxide tanks up to 12,500 gallons.

2. Confirm Concentration and Delivery Conditions

Identify the Sodium Hydroxide concentration and how the chemical will arrive. Because it is often delivered at elevated temperatures, Assmann recommends Crosslink Polyethylene for this application due to its higher softening point compared with conventional polyethylene.

Assmann’s crosslinked polyethylene tanks are NSF/ANSI 61 certified for chemical storage applications that include 50% Sodium Hydroxide.

3. Calculate the Required Temperature Differential

Cold-weather protection should be based on the difference between the temperature the material must maintain and the lowest ambient temperature the tank will experience. Assmann offers heat tracing and insulation systems capable of 50°F, 80°F, or 100°F temperature differentials, or Delta T. These values are system capabilities, not thermostat setpoints.

4. Decide Whether Secondary Containment Is Required

Facilities should determine whether the application, site standards, or local requirements call for secondary containment. Assmann offers double-wall tanks designed to contain more than 120% of the primary tank’s capacity. Heating, sensors, and monitoring can be considered separately based on the application; they should not be assumed to be included with every configuration.

5. Map Fittings, Access, Filling, and Venting

The team should review where the tank will sit, how deliveries will be made, how operators will access the system, and where connections should be placed. Resolving those questions early helps the distributor and manufacturer evaluate the complete storage arrangement rather than treating accessories as afterthoughts.

6. Establish the Support Path

Clarify who the facility will contact during specification, ordering, installation, and future service questions. Assmann works through an extensive distributor and representative network supported by regional managers and an internal team.

One of Assmann’s longest-running distributor relationships, with Data Design Services II, has lasted more than 40 years. That continuity is a useful example of why the support path matters throughout a tank’s service life.

Bring the Six Decisions Together

The goal is not to choose the most elaborate configuration. It is to specify the system that matches the facility’s actual conditions. A prepared distributor conversation can help identify missing information, coordinate questions with Assmann, and keep the project focused on the application.

Download or bring this six-point list to your next tank-planning conversation:

  • Capacity and working volume
  • Concentration and delivery conditions
  • Required material temperature and lowest ambient temperature
  • Containment requirements
  • Fittings, access, filling, and venting
  • Distributor and manufacturer support contacts

Explore Sodium Hydroxide Storage Solutions: https://assmann-usa.com/solutions/applications/sodium-hydroxide-storage/

Learn about Heat Tracing and Insulation: https://assmann-usa.com/tank-accessories/heat-tracing-insulation/

Request a Quote: https://assmann-usa.com/request-a-quote/

Quality: First and Forever.

The Assmann Team

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About Assmann

Since 1980, Assmann tanks have been created with a controlled process that guarantees quality. We manufacture double-wall, vertical, conical bottom, cylindrical horizontal, free-standing horizontal leg, and open top storage tanks. Additionally, a large assortment of containment basins are available based on application to be used.

When customers need polyethylene tanks custom-made to fit within a particular space, we are able to design, engineer, and manufacture to the most exacting standards and specifications. If you need above ground chemical storage tanks, contact us for a quote.