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Evaluate Engine Emissions and Performance Using PTC-17


What is PTC-17?

Performance Test Code 17 (PTC-17) is the general guideline from the American Society of Mechanical Engineers (ASME) for Testing Internal Combustion Engines.


What Measurements Are Required?

Corrected Fuel Flow (SCFM) and Engine Output (BHP) are general parameters to determine the Heat Rate, Engine Efficiency and Brake Specific Fuel Consumption (BSFC).



Purpose of PTC-17

An Obligation to meet the Air Quality Management District’s (AQMD’s) Revised Rule 1110.2

To assess the impact on:

§         Emissions

§         Efficiency

            And to produce

§         Emissions Correction Factors (ECF)





Testing an engine to achieve the right result at the first time is a complicated task and requires a special expertise. Advanced Engine Technologies Corp. (AETC) is the top qualified candidate remaining in The United States.  With over 20 years of experience running emission and performance test, AETC value team effort and collaborate with our clients to complete the task on time.  We manage the work from initial site meetings to final report to the AQMD. Getting the test done properly and customer satisfaction defines what AETC is well-known for in the gas machinery industry.


How AETC Runs the Emission and Performance Test?


The test is similar to the RATA (Relative Accuracy Test Audit) at three different loads. Advanced Engine Technologies Corporations (AETC) field test engineers manually record Fuel Flow, Engine Output and other system parameters required by PTC-17. To ensure the accuracy and validity of the test data, AETC also back up the manual data with the use of our signature mapping program which records the test data digitally.


Test Preparation (Gen-Set):


The on-engine instrumentations such as kWh and fuel flow metering devices are checked and validated. Any emission measuring analyzers are calibrated ready for the test. The test engine is placed at a fix load to confirm signals for accuracy. AETC monitor the engine parameters and exhaust emissions to ensure the unit has achieved thermal equilibrium (typically ~15-30 minutes).




Upon reaching the condition, the test duration is set for 30 minutes.  Record all required engine parameters manually every ten minutes while the mapping program continuously record available data for comparison. Any fuel mixtures or gases flowing to the engine such as landfill, natural or digester gas are subject to collect and send to a lab for analysis to confirm BTU and fuel composition. Before the next load condition, verify the CEMS or Reference Method  to maintain emission validity throughout the test.



Data Handling:


The emissions are manually recorded together with any available vital statistics in the engine control system every 10 – 15 minutes. The data includes but is not limited to:


  • NOx, CO, O2
  • Corrected Fuel Flow (SCFM)
  • Combustion Pressure (if in-cylinder pressure sensors exist)
  • Cylinder Exhaust Temperature


Electrical parameters are taken from the generator controls;


  • Volts, Amps and PF
  • KWh meter (before and after each run)
  • The test points are plotted to compare with factory data for validation; instantaneous BSFC and ECF desire to calculate as the test in progress.
  • Once the data of sufficient quality has been collected, move onto the next load test condition.
  • At completion, the Average Engine Efficiency over 3 different Loads can be calculated to produce the Emission Correction Factor.



Typical Test Matrix for a Dual Fuel Engine:


Test Points

Percent of

Rated Torque

Fuel Gas

Air Fuel Ratio



Fixed Fuel Blend




Fixed Fuel Blend




Fixed Fuel Blend



Sample Test Result for Dual Fuel Engines: