Standards and regulations
ASME PTC 4 (boiler performance test)
Also known as PTC 4, ASME Performance Test Code 4.
ASME PTC 4 (American Society of Mechanical Engineers Performance Test Code 4) specifies the standard methodology for fired-steam-generator performance tests. PTC 4 measurements quantify boiler efficiency, individual heat losses (dry gas, moisture, unburned carbon, radiation, etc.) and the contribution of convective-pass fouling to overall performance.
Why it matters for sonic-horn business cases
A PTC 4 test before and after a sonic-horn installation quantifies the heat-rate improvement attributable to the cleaning system. Independent PTC 4 measurements provide third-party-credible evidence of acoustic-cleaning ROI, which is particularly valuable for utility-scale procurement decisions where multiple stakeholders must approve capital spend.
Related terms
Related terms
- BoilerA boiler is a vessel that converts fuel chemical energy into steam by heating water. Coal-fired, biomass, oil, gas and recovery boilers all foul; sonic horns clean heat-transfer surfaces.
- Heat rateHeat rate is the fuel energy required to produce one unit of electrical output, measured in BTU/kWh or kJ/kWh. Fouling on convective surfaces directly degrades heat rate.
- EconomiserAn economiser is the final tube bank in a boiler's convective pass that recovers heat from the flue gas by preheating feedwater. Ash bridging in the economiser is a routine cleaning challenge.
- Air heaterAn air heater (also air preheater, APH) recovers low-grade heat from flue gas to preheat combustion air. Cold-end fouling and corrosion are the dominant operational challenges.