At Burgess Pipeline Services, we understand the critical importance of precise odorant concentration analysis in natural gas transportation. Adhering to established standards and utilizing the right testing methods ensures consistency, reliability, and safety in your operations. In this blog post, we explore various testing methods and instruments, with a focus on the widely used Length-Of-Stain Detector Tubes, and provide insights into their advantages, disadvantages, and associated ASTM standards.
Understanding Testing Standards and Recommendations
ASTM Standards
The American Society for Testing and Materials (ASTM) provides essential standards for odorant concentration analysis. While adoption is recommended, it is not mandatory. Key standards like ASTM D1988 and ASTM D4810 are specifically designed for analyzing mercaptans and hydrogen sulfide in natural gas using Length-Of-Stain Detector Tubes.
Length-Of-Stain Detector Tubes (Stain Tubes)
Stain tubes offer a rapid and cost-effective method for detecting sulfur compounds, including mercaptans and hydrogen sulfide. Despite being the least accurate, they serve as valuable field tools.
Operation
To use stain tubes, the operator breaks both ends of the tube and draws the test gas through it using a calibrated hand pump. The resulting stain length correlates with the concentration, which can be read from markings on the tube.
Advantages and Disadvantages
Advantages:
Speed
Low cost
Simplicity
Disadvantages:
Low accuracy (±25 percent)
Potential interferences from other gas constituents
Limitations in detecting trace-level measurements
Accuracy Considerations
Stain tubes exhibit the highest accuracy in the center of their measuring range. Selecting tubes calibrated for specific detection levels is crucial for accurate readings. Correct application of temperature, humidity, and atmospheric pressure correction factors is also essential.
Disposal Considerations
Depending on the sorbent used, stained tubes may be considered hazardous substances. Proper disposal in compliance with regulations is necessary. Non-hazardous tubes should undergo a water soaking process, and the resulting water should be pH neutralized before disposal.
Effectively navigating odorant concentration analysis requires a comprehensive understanding of testing methods and instruments. Length-Of-Stain Detector Tubes, despite their limitations, remain valuable tools in the field. By adhering to established standards, such as those provided by ASTM, operators can ensure consistency, reliability, and compliance in their odorization practices, contributing to the overall safety and efficiency of natural gas transportation systems.
At Burgess Pipeline Services, we are committed to providing top-notch solutions for natural gas odorization. Contact us today to learn more about our services and how we can support your operations.