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D3370-18 – Standard Test Method Technical Guide
ASTM Standard D3370-18, “Standard Practices for Sampling Water from Flowing Process Streams,” is a critical document authorized by the U.S. Department of Defense and developed under the jurisdiction of ASTM Committee D19 on Water. It establishes standardized methods for extracting representative water samples from closed conduits in power stations and various industrial process streams, specifically designed to support chemical, physical, microbiological, and radiological analyses.
📜 Scope and Sampling Practices
The scope of D3370-18 (Section 1.1) encompasses three primary methods for sampling water from closed conduits. It is important to note that this standard does not cover specialized equipment unique to a specific analysis method; users should consult ASTM Volumes 11.01 and 11.02 for such equipment. According to Section 1.3, values stated in SI units are to be regarded as standard, while inch-pound equivalents are provided as mathematical conversions for informational purposes only.
| 🏷️ Practice | 📐 Sections | 🎯 Description |
|---|---|---|
| Practice A — Grab Samples | 9 – 17 | Single, discrete samples taken at a specific point and time. |
| Practice B — Composite Samples | 18 – 23 | Integrated samples collected over a defined period to represent average conditions. |
| Practice C — On-Line Sampling | 24 – 29 | Continuous sampling and real-time analysis directly from the flowing process stream. |
🔧 Referenced Documents and Key Terminology
A comprehensive network of supporting ASTM standards underpins D3370-18. These provide essential context for water terminology, reagent purity, and specific analytical methods. Key material specifications for constructing sampling systems are also referenced, including A106/A106M for carbon steel pipe and A269 for stainless steel tubing.
| 🟦 ASTM Designation | ⚡ Title / Purpose |
|---|---|
| D1066 | Practice for Sampling Steam |
| D1129 | Terminology Relating to Water |
| D1193 | Specification for Reagent Water |
| D5540 | Practice for Flow Control and Temperature Control for On-Line Sampling |
| D4453 | Practice for Handling of High Purity Water Samples |
| D4841 | Practice for Estimation of Holding Time for Water Samples |
| D3856 | Guide for Management Systems in Laboratories Engaged in Analysis of Water |
For definitions of general water terms, the standard mandates referral to Terminology D1129. A specific term defined in Section 3.2 is the back-pressure regulator, a device designed to maintain constant upstream pressure, ensuring consistent flow and excellent pressure sensitivity in on-line analyzers. Other crucial referenced standards include D3648 (Measurement of Radioactivity) and D4840 (Sample Chain-of-Custody Procedures).
⚙️ Safety, Compliance, and International Standing
Section 1.4 explicitly states that the standard does not purport to address all safety concerns. Users bear the full responsibility for establishing appropriate safety, health, and environmental practices and determining the applicability of regulatory limitations prior to use. Specific hazard statements are located within Sections 8.3 and 13.4 of the full standard.
⚠️ Safety and Regulatory Compliance: It is the sole responsibility of the user of D3370-18 to establish appropriate safety, health, and environmental practices. Users must pay close attention to the specific hazard warnings detailed in Sections 8.3 and 13.4.
🌍 International Standards Development: As noted in Section 1.5, this international standard was developed in accordance with the internationally recognized principles on standardization established by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
❓ Frequently Asked Questions
🔍 What is the main focus of ASTM D3370-18?
The standard focuses on practices and equipment for sampling water from closed conduits (flowing process streams) in power stations for chemical, physical, microbiological, and radiological analyses.
💡 Where can I find hazard warnings for this standard?
While Section 1.4 provides a general safety disclaimer emphasizing user responsibility, specific hazard statements are provided within the standard text in Sections 8.3 and 13.4.
⚡ Are the values in SI or inch-pound units?
According to Section 1.3, SI units are the standard. Inch-pound units are provided in parentheses as mathematical conversions for informational purposes only and are not considered standard.
📌 What glossary defines the terms used in these practices?
For definitions of general water-related terms, users must refer to ASTM Terminology D1129. Terms specific to this standard, such as “back-pressure regulator,” are defined directly within Section 3.2.