AF Form 1464: Monthly Steam Boiler Plant Operating Log

AF Form 1464: Monthly Steam Boiler Plant Operating Log – PLANT OPERATING LOG, is a critical U.S. Air Force form used to document monthly performance and operational data for steam boiler plants. It supports safe, efficient, and compliant operation of high-pressure steam systems across Air Force installations.

This form is prescribed under AFI 32-1068 (Heating Systems and Unfired Pressure Vessels) and AFMAN 32-1068. It applies specifically to Air Force steam boiler plants operating at pressures greater than 15 psig. It compiles daily data from the companion AF Form 1458 (Daily Steam Boiler Plant Operating Log) into a monthly summary for review by supervisors and the Base Civil Engineer.

Why AF Form 1464 Matters for USAF Boiler Operations?

Boiler plants provide essential heating and process steam for facilities on military bases. Accurate logging helps:

  • Track fuel consumption and efficiency.
  • Monitor combustion performance.
  • Identify trends in water usage and make-up rates.
  • Support environmental compliance (e.g., air quality permits and EPA boiler regulations).
  • Enable preventive maintenance and troubleshooting.

Consistent use of AF Form 1464 contributes to energy savings, reduced downtime, regulatory adherence, and overall plant reliability. Computer-generated equivalents are acceptable if they capture all required data.

Key Features and Layout of AF Form 1464

The two-page form (revision dated 20170208; previous editions obsolete) includes standardized sections for monthly aggregation. Separate logs are required for each distinct boiler plant.

Header Information (Items 1-4):

  • Command
  • Base and location
  • Building
  • Month/Year (MMM YYYY)

Daily Recording Columns (typically for up to 31 days):

  • Date
  • Fuel (Item 5): Type (G for Gas, O for Oil, C for Coal) and daily quantity (e.g., Mcf for gas, gallons for oil, pounds for coal). Multiple fuels noted as needed.
  • Steam (Item 6): Daily average plant steam pressure (psig) and total steam output (Mlbm — thousands of pounds).
  • Efficiency Analysis Data (Item 7): Oxygen percentage (O₂), stack ΔT (difference between stack and combustion air temperature in °F), and combustion efficiency (ηc) per boiler.
  • Feedwater System (Item 8): Total feedwater flow (gallons), make-up flow (gallons), and make-up percentage.
  • Plant Daily Totals (Item 9): Total input (MMBtu), total output (MMBtu), plant combustion efficiency (ηc-Plant), and plant overall efficiency (ηPlant).

Monthly Summary (Bottom of Page 1):

  • Total fuel used (Item 10)
  • Plant input (MMBtu) (Item 11)
  • Plant output (MMBtu) (Item 12)
  • Plant combustion efficiency (Item 13)
  • Plant overall efficiency (Item 14)

Signatures and Remarks:

  • Reviewed and signed by the supervisor of boiler operations and the Base Civil Engineer (or delegate).
  • Space for remarks, such as notes on multiple fuel usage durations or anomalies.

The form includes unit conversions and temperature guidance (e.g., °F = 1.8 × °C + 32) for consistency.

How to Use AF Form 1464: Step-by-Step Process

  1. Daily Data Transfer — Post information each day from AF Form 1458. Constantly attended plants record hourly data on the daily form; less-attended plants record per visit per AFI 32-1068.
  2. Calculate Daily Values — Include fuel usage, steam output, efficiencies, and feedwater metrics. The daily form helps compute combustion and boiler efficiencies using steam heat content.
  3. Aggregate Monthly Totals — Sum fuel, input, and output. Average efficiencies across the month.
  4. Review and Sign — The boiler operations supervisor and Base Civil Engineer review the completed log for accuracy and performance insights.
  5. Retention — Maintain records as required for compliance with environmental regulations (e.g., 5 years for certain EPA-related boiler data).

For plants with more than four boilers, use additional sheets. Annotate dual-fuel operations clearly in remarks.

  • AF Form 1458: Daily Steam Boiler Plant Operating Log — primary source for daily entries.
  • AF Form 1459: Water Treatment Operating Log for Steam and Hot Water Boilers.
  • Governing documents: AFMAN 32-1068 and AFI 32-1068, which outline operating logs, maintenance, inspections, and tune-up requirements for boilers to meet efficiency and emissions standards.

These logs also support broader DoD and EPA compliance, including boiler tune-ups under 40 CFR Part 63.

Download the Official AF Form 1464

Access the current fillable PDF directly from the official Air Force e-Publishing site:

Download AF Form 1464 PDF

Always verify the latest version on e-Publishing.af.mil, as forms are updated periodically.

Best Practices for Boiler Plant Logging

  • Record data consistently using calibrated instruments.
  • Monitor trends in stack temperature, O₂ levels, make-up water percentage, and efficiency to optimize performance and detect issues early.
  • Integrate with water treatment logs (AF Form 1459) for complete system oversight.
  • Use logs to support annual boiler tune-ups and environmental reporting.

Proper documentation with AF Form 1464 helps Air Force civil engineering teams maintain high standards of safety, efficiency, and sustainability in steam boiler operations.

For questions about implementation or related training, consult your installation’s Base Civil Engineer or the guidance in AFMAN 32-1068. Accurate boiler logging protects personnel, equipment, and mission readiness while controlling energy costs.