Asme Ptc 4.1.pdf May 2026

ASME PTC 4.1 Guide: Performance Test Code for Fossil-Fuel Steam Generators

• L₁ (dry gas) = 0.24 × (350 – 80) / (21,500) × (11.5 × CO₂%?) → requires gas analysis tables (p. 21-26).
• L₂ (H₂O from H₂) = (9 × H₂%) × (enthalpy steam) / HHV
• L₇ (Radiation) = 0.35% (from Fig. 7 at 100% load)
• Sum losses = 15.2% → Efficiency = 84.8% (HHV).

ASME PTC 4.1, "Steam Generating Units"

Based on the standard designation, you are referring to .

• Official source: ASME Digital Library (requires purchase or institutional access).
• Public domain copies: Many universities and engineering archives host scanned PDFs of the 1974 version (copyright status: still ASME-owned, but widely circulated for historical reference).
• Current replacement: PTC 4-2013 (Reaffirmed 2018) – should be used for new projects.

• ( \dotm_s ) = steam mass flow
• ( h_s ) = steam enthalpy
• ( h_fw ) = feedwater enthalpy
• ( \dotm_f ) = fuel mass flow
• ( HHV ) = higher heating value

• Provides guidance for repeating tests, handling transient anomalies, and statistical treatment of repeated runs.
• Recommends minimum number of runs at each test point to demonstrate repeatability.

| Parameter | Required Accuracy | Instrument | |-----------|------------------|------------| | Fuel flow | ±1% | Belt scale, Coriolis, orifice | | Steam flow | ±0.5% | ASME nozzle, Venturi | | Feedwater temp | ±0.5°F | RTD | | Flue gas O₂ | ±0.2% | Zirconia or paramagnetic | | Flue gas CO | ±5 ppm | NDIR | | Flue gas temp | ±2°F | Type K thermocouple (traverse) | | Ambient dry/wet bulb | ±0.5°F | Psychrometer | Asme Ptc 4.1.pdf

How to Legally Obtain ASME PTC 4.1.pdf