The subject "ASME PTC 19.2 fixed" refers to the application of the ASME PTC 19.2 - Pressure Measurement code specifically to permanent (fixed) instrumentation installations. This supplement to the ASME Performance Test Codes provides the standardized rules for accurately measuring pressure to evaluate equipment performance. Overview of ASME PTC 19.2
This standard, officially titled Pressure Measurement Instruments and Apparatus, provides comprehensive guidance on determining pressure values with high accuracy for performance tests.
Primary Objective: To standardize the methods for measuring pressure and calculating the associated uncertainties. Key Focus Areas:
Instrumentation Selection: Guidance on choosing instrument types (e.g., elastic gauges, transmitters) based on pressure range and accuracy needs.
Installation Standards: Detailed requirements for pressure taps, connecting piping, and diaphragm seals to ensure "fixed" setups do not introduce errors.
Uncertainty Analysis: Procedures for determining random and systematic uncertainties in measurements. Core Content for "Fixed" Installations
When applying PTC 19.2 to fixed (permanent) systems, several critical sections of the code must be followed to maintain data integrity over time:
Measurement Installations (Section 5): This is vital for fixed systems. It covers the proper design and location of pressure taps and the configuration of connecting piping to prevent signal dampening or liquid traps.
Calibration and Standards (Section 4): Fixed instruments must be calibrated against traceable standards. The code outlines intervals and procedures to ensure long-term reliability.
Data Transmission Protocols: Since fixed systems often feed into a central Data Acquisition System (DAS), the supplement provides protocols for accurate data transmission.
Environmental Factors: Guidance on accounting for installation effects, such as temperature variations or vibration, which are common in fixed plant environments. Common Applications
Power Plants: Monitoring steam turbine inlet/exhaust pressures as per ASME PTC 6.
Industrial Facilities: Measuring pressure in compressors, exhausters, or heat exchangers. asme ptc 192 fixed
Fluid Systems: Managing pressure data in complex two-phase fluid systems.
For a full digital copy or specific technical details, you can visit the official ASME PTC 19.2 Product Page. Pressure Measurement - PTC 19.2 - ASME
The phrase "asme ptc 192 fixed" refers to the ASME PTC 19.2 standard, which covers Pressure Measurement Instruments and Apparatus.
In the context of "prepare feature," this likely refers to the preparation phase of a performance test, specifically regarding the installation and setup of pressure-sensing equipment to meet uncertainty and accuracy requirements. Feature Preparation: ASME PTC 19.2 (Pressure Measurement)
When preparing pressure measurement features according to ASME PTC 19.2, you must focus on these critical areas:
Instrument Selection: Choosing between fixed and portable instruments based on the required pressure range, accuracy, and output. Tap Design and Installation:
Ensuring pressure taps are perpendicular to the flow and free of burrs to prevent measurement errors.
Verifying that "fixed" measurement locations (static pressure taps) are placed in areas with stable flow profiles.
Connection Lines: Designing the tubing between the source and the instrument to minimize leaks and temperature-induced errors (especially for high-temperature or two-phase fluid systems).
Calibration Verification: Pre-test calibration of fixed transducers against a standard (like those outlined in ASME B40.100) to ensure they are within the allowable uncertainty for the specific Performance Test Code (PTC).
Environmental Factors: Preparing the feature to withstand or account for ambient conditions like vibration, humidity, and temperature variations. Standard Details
Object: To provide instructions for the accurate determination of pressure values in support of Performance Test Codes. The subject "ASME PTC 19
Versions: The latest primary version is ASME PTC 19.2-2010 (reaffirmed in 2020), which updated many requirements from the older 1987 version.
Availability: Full documentation is available through the ASME Webstore or ANSI Webstore. Performance Test Codes - ASME
Audits frequently reveal these violations of PTC 19.2 Fixed requirements:
The standard does not mandate a specific calendar interval but gives guidance based on usage:
However, ASME PTC 19.2 Fixed strongly recommends performing a “as-left, as-found” procedure—record readings before adjustment and after adjustment to track drift.
Per ASME PTC 19.2 Fixed, total uncertainty must include:
Appendix A: Sample Uncertainty Budget for Fixed Pressure Measurement (Full Scale = 10 MPa)
| Source | Type | Value (kPa) | Distribution | Standard Uncertainty (kPa) | |--------|------|-------------|--------------|----------------------------| | Calibration | B | ±15 | Normal | 7.5 | | Drift (1 yr) | B | ±10 | Rectangular | 5.8 | | Hydrostatic residual | B | ±2 | Rectangular | 1.2 | | Random (30 samples) | A | ±8 (std dev) | Normal | 8.0 | | Combined | – | – | – | 12.3 | | Expanded (k=2) | – | – | – | 24.6 kPa (0.246% FS) |
. It is a foundational technical document used to ensure accuracy and reliability in industrial pressure testing. The American Society of Mechanical Engineers - ASME Core Purpose and Scope
The code provides standardized instructions for the accurate determination of pressure values in support of other ASME Performance Test Codes. Key areas covered include: The American Society of Mechanical Engineers - ASME Instrument Selection
: Guidance on choosing methods and instruments based on allowable uncertainty, pressure range, and equipment characteristics. Measurement Types
: Protocols for static and dynamic measurements, as well as two-phase fluid systems. Calculations & Corrections Impulse lines not sloped, causing liquid traps and
: Methods for applying necessary corrections to ensure data integrity. Uncertainty Analysis
: Procedures for determining the uncertainty of measurements to maintain a "level playing field" between manufacturers and users. The American Society of Mechanical Engineers - ASME Technical Components
The document is structured to guide engineers through every phase of pressure measurement: Pressure Standards
: Defines inter-laboratory, transfer, and working standards. Measurement Devices : Covers a vast array of hardware, from simple Manometers Piston Gages to complex Pressure Transmitters Vacuum Sensors Installation Practices : Specific requirements for Pressure Taps
, probes, and connecting piping to avoid "installation effects" that cause measurement errors. Current Status Latest Version : The most current active standard is ASME PTC 19.2-2010 , which was reaffirmed in Availability
: You can find the full code through official distributors like the ASME Standards Store ANSI Webstore uncertainty calculation methods or a comparison with other PTC supplements like Temperature Measurement (PTC 19.3)
Assuming the typo ("192" → "19.2") and the keyword "fixed" refers to fixed pressure elements (like diaphragms, capsule elements) or fixed installations, here is your content.
Before diving into the "Fixed" aspect, let us establish the foundation. ASME PTC 19.2 is a standard published by the American Society of Mechanical Engineers (ASME) under the Performance Test Codes (PTC) umbrella. Its full title is "Pressure Measurement Instruments and Apparatus."
This code provides uniform methods for the testing and calibration of pressure measuring devices. It applies to:
The standard ensures that when an engineer reports a pressure reading during a performance test (e.g., turbine efficiency, pump flow, boiler output), the measurement uncertainty is known, quantified, and consistent with industry best practices.
For wet gas or steam, the impulse lines (the fixed tubing) must slope continuously from the tap to the transmitter:
A 500 MW combined-cycle power plant struggled with unexplained 1.5% variance in gas turbine output between spring and fall. The culprit? Fixed pressure taps on the compressor discharge.
Investigation revealed:
After re-engineering the ASME PTC 19.2 fixed installation—relocating the tap, fixing the slope, and installing a heated impulse line—the variance dropped to 0.2%. The plant recovered $1.2 million annually in avoided performance degradation arguments with the turbine OEM.