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ASTM D1998 Standards: The Tank Verification Process

Poly Processing takes special care to ensure it is in compliance with ASTM D1998 standards. In the third piece of our Top 15 Questions to Ask Your Tank Manufacturer, we take a brief look at some common questions regarding verification.

How does the verifying process work?

After Poly Processing manufactures a tank, its thickness is measured ultrasonically (a special device specifically designed to measure plastic is used).  The testing device is calibrated every morning before each shift in order to guarantee readings are not only consistent but accurate.

What are the testing locations?

Tanks are typically measured at the 1’, 2’, and 3’ elevation marks (heights are measured starting from the bottom of the tank). It’s at these locations where the most stress will occur during the storage process.
In addition to the three different heights, measurements are also taken at three different degree locations around the tank. Thus, there are nine measurements taken in total.
In addition to the three different heights, measurements are also taken at three different degree locations around the tank. Thus, there are nine measurements taken in total.
The measurements are all compared against the thickness design requirements to be in compliance with ASTM D1998. It’s at these locations in the tank where thickness is most critical. It’s also important to note that each tank thickness calculation is based on chemical specific gravity to ensure proper strength in each application.
Although the nine measurements are enough for Poly Processing to meet or exceed every ASTM D1998 standard, customers may also request additional tests at different heights, depending on individual preference.

What do you do with the results?

All of the results from the aforementioned tests are included in the verified document that Poly Processing keeps on record for each tank (a copy of this report can be provided to a customer upon request).

Is there paperwork that documents and ensures that all of the steps have been taken?

The quality report is a “cut and dry“ one-page document that includes the tank’s serial number, location of manufacturing, thickness measurements, and any other pertinent testing information.
Typically, the quality report is completed and stored by Poly Processing. However, a company may request its own copy if desired.

Is there a warranty or process to deal with a damaged tank?

It’s important to note Poly Processing will not sell or distribute a tank that does not meet or exceed ASTM D1998 standards. In addition, Poly Processing offers the best tank warranty available in the industry.

Is there a checks-and-balances system monitored by an outside vendor or is testing/documentation done in house?

There is no outside vendor monitoring the ASTM D1998 standard. All testing and monitoring is completed in-house. Poly Processing welcomes customers and/or inspectors to watch all testing first hand.

For additional information on ASTM D1998 standards and verification, please contact a chemical storage tank expert at Poly Processing.

Talk to a chemical storage tank expert

Topics: Value Added