ASTM D6137 Sulfuric Acid Resistance of Polymer Linings

The ASTM D6137 test method is intended to evaluate the sulfuric acid resistance at elevated temperatures of polymer linings applied to carbon steel substrates subject to a sulfuric acid attack. The performance of specimens assessed by this method is quantified in terms of the inch-pounds.

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Introduction

Scope

The standard test method is the ASTM D6137 test technique for sulfuric acid resistance of polymer linings for flue gas desulfurization systems. This test method aims to determine the combined effects of heat and sulfuric acid exposure on a lining system applied to a carbon steel substrate. This test method examines linings’ primary failure mechanisms when used on square test panels and cycled from ambient temperature to a pre-determined increased temperature. For ASTM D6137, the recommended test temperatures of 200°F and 350°F are based on average maximum working zone temperatures in flue gas desulfurization systems.

Significance of ASTM D6137:

ASTM D6137 is one of the most crucial test methods for determining the resistance against sulfuric acid by polymer linings in industries that deal with such corrosive acid. This test determines how well these linings can hold up to sulfuric acid for material durability in chemical exposure, safety, and reliability. The standard ensures that the protective lining is of quality, preventing possible leaks and guaranteeing operational safety in industries related to the manufacture of chemicals and the treatment of waste.

Advantages and Disadvantages of ASTM D6137

The table below gives the advantages and disadvantages of ASTM D6137 testing.

Advantages	Disadvantages
The test results can be combined with different tests to select a surface’s lining in flue gas desulfurization systems.	The test cannot evaluate the area inside the scrubbed gas streams at temperatures below the water dew point.
It determines the combined effect of heat and the lining system’s exposure to sulfuric acid.	It cannot produce the thermal gradient through the lining present in actual applications.
The test method evaluates significant failure modes of linings applied to square test panels that are cycled from room temperature to a designated elevated temperature.	The physical or mechanical effects and chemicals present in the flue gas can affect actual lining performance.

ASTM D6137 Test Procedure

Preheat the oven and immerse the lower portion of the test panel in sulfuric acid for one hour as part of the ASTM D6137 test. After immersion, remove the panel and allow it to dry at laboratory temperature for about 15 minutes. Next, place the test panel vertically in the oven for 15 to 17 hours. After each exposure interval, you remove the panel and let it cool. This cycle repeats continuously. You examine the panels and record the findings after 1, 2, 5, 10, 20, and 30 cycles following ASTM D6137. Depending on the panel’s condition and the test objectives, you may stop the test after 30 cycles or as needed.

Specimen Size

According to ASTM D6137, the test panels used in the technique must be new and made of commercial-quality carbon steel, with a minimum thickness of 6 mm and a square size of 200 mm.

Data Analysis

The ASTM D6137 test results can be used with other testing techniques to select a liner for surfaces in flue gas desulfurization (FGD) systems that will be exposed to hot, unscrubbed flue gas or scrubbed gas significantly warmed above the water dew point.

Result

It is a standard test technique for the sulfuric acid resistance of polymer linings in flue gas desulfurization systems.

Conclusion

ASTM D6137 is a standard for determining polymer linings’ critical sulfuric acid-resistant materials for specific services in flue gas desulfurization systems. This test method ensures linings can resist the combined effects of temperature and sulfuric acid to achieve increased material life and enhanced operational safety. Compliance with this test standard prevents industries from leakage and provides quality protective linings to ensure reliably the performance of crucial assets in a corrosive environment. Ensure you get the best protection and performance in your lining systems by following ASTM D6137 and integrating other appropriate tests. To learn more about ASTM D6137 or to make its incorporation into operations a reality, contact an ISO-accredited testing facility today.

What is ASTM D6137?

The ASTM D6137 test method is intended to evaluate the sulfuric acid resistance at elevated temperatures of polymer linings applied to carbon steel substrates subject to a sulfuric acid attack.

Why is ASTM D6137 important?

ASTM D6137 is one of the most crucial test methods for determining the resistance of polymer linings to sulfuric acid in industries that deal with such corrosive acid. This test determines how well these linings can withstand sulfuric acid for material durability in chemical exposure, safety, and reliability.

What does the ASTM D6137 test procedure involve?

This test involves dipping a test panel into sulfuric acid and heating it in an oven at temperatures cycling between ambient and high. After a pre-determined number of cycles, the panels are reviewed for their capability of sustaining acid and heat.

What are the limitations of ASTM D6137?

The test cannot evaluate the area inside the scrubbed gas streams at temperatures below the water dew point. The physical or mechanical effects and chemicals present in the flue gas can affect actual lining performance.

What are the advantages of ASTM D6137?

The test results can be combined with different tests to select a surface’s lining in flue gas desulfurization systems.