Physical Address
304 North Cardinal St.
Dorchester Center, MA 02124
D5503-24 – Standard Test Method Technical Guide
🔍 Significance and Scope of the Standard
According to ASTM D5503-24, a well-designed sample-handling and conditioning system is essential to the accuracy and reliability of pipeline monitoring instrumentation, such as gas chromatographs and moisture analyzers. The standard emphasizes that approximately 70% of the problems encountered are directly associated with the sampling system (Section 4.1).
⚠️ Critical Restriction: This practice is strictly intended for single-phase gas mixtures. A representative sample cannot be obtained from a two-phase stream (Section 1.2). Engineers must verify single-phase flow conditions at the sample probe location to ensure representative results.
The scope covers the complete system design, which must extract a representative sample from a flowing pipeline, transport it to the analyzer, condition it to be compatible with the analyzer, switch sample streams and calibration gases, transport excess sample to recovery, and resist corrosion (Section 5.1).
⚙️ Core System Functions and Configuration
Section 5.1 of D5503-24 defines the critical roles a sample handling system must fulfill. The selection of the system components depends heavily on the operating conditions and stream composition.
| 🟦 Function | 📏 Description & Requirements |
|---|---|
| Sample Extraction | Using a sample probe to extract a representative sample directly from the flowing pipeline (Section 3.2.3). |
| Sample Transport | Transporting the sample to the analyzer with minimal lag time (Section 3.2.2). |
| Conditioning | Filtering, pressure regulating, and temperature controlling the sample for analyzer compatibility. |
| Stream Switching | Switching sample streams and calibration gases for multi-stream analysis and validation. |
Excess Handling
📥 Standard Documents Download |