The primary goal of PTC 19.2 is to ensure that when you read a pressure value, you can trace the accuracy and uncertainty of that reading back to fundamental standards. It bridges the gap between the theoretical physics of pressure and the practical application of gauges on a shop floor.
A comprehensive pressure measurement standard does not exist in isolation. It would reference and be referenced by numerous other standards. For example, it may cite ASME PTC 2 (Definitions and Values) and ASME B40.100 (Pressure Gauges and Gauge Attachments). In turn, other test codes and industry standards would reference it, such as ASHRAE 64 (Methods of Testing Remote Mechanical Draft Air-Cooled Refrigerant Condensers) and many ASME PTCs (e.g., PTC 22 for Gas Turbines, PTC 23 for Cooling Towers). This network of references underscores the foundational role of a pressure measurement code.
ASME PTC 19.2 covers a broad range of pressure measurement applications, including:
Recommended practices to handle fluctuating or unsteady flows. 3. Calibration and Error Management
Ensuring measurements stay within the "governing band of uncertainty" required by the primary test code. Evolution and Availability Pressure Measurement - PTC 19.2 - ASME asme ptc 192
is the premier industrial standard governing the instructions, instrumentation, and protocol for accurate pressure measurement during performance tests. Formally known as ASME PTC 19.2: Pressure Measurement Instruments and Apparatus Supplement , this code is part of the Performance Test Codes (PTC) framework established by the American Society of Mechanical Engineers (ASME) .
: Establishes uniform methods for using pressure-measuring instruments. Instrument Selection
| Pitfall | Consequence | Solution per PTC 19.2 | |---------|-------------|------------------------| | Impulse line liquid column in gas service | Erratic or offset reading | Slope lines downward from tap to instrument; install low-point drains. | | Gas pocket in liquid impulse line | Slow response, damping error | Slope lines upward from tap to instrument; install high-point vents. | | Using transmitter outside calibrated range | Non-linearity, clipping | Choose range so operating pressure is 20–80% of calibrated span. | | Ignoring barometric pressure changes | Gauge pressure errors (up to ±0.5 psi) | Use absolute pressure sensor or record baro correction. | | Not zeroing before test | Systematic offset | Perform live zero (vented) check immediately before and after test. |
: Methods for correcting raw data for factors like gravity, temperature, and elevation. The primary goal of PTC 19
: Standards for the calibration and error management of pressure-sensing equipment to maintain data sufficiency. ANSI Webstore Relation to Other Standards
Factors like ambient temperature changes affecting the sensor.
To get the most out of ASME PTC 19.2, industries should:
Piezoelectric and strain-gauge sensors translated into digital metrics. 2. Installation and Location Setup It would reference and be referenced by numerous
: Procedures for determining the statistical reliability of a measurement. Key Measurement Devices Covered
Calibration is essential for maintaining measurement accuracy. This section addresses the relationship between field instruments and reference standards, ensuring traceability to recognized measurement standards.
This code serves as a foundational guide for engineers to ensure that pressure readings are accurate and reliable during performance tests. Its primary features include: Standardized Procedures