United States Navy Boiler Technicians (BT rating) — formerly called Boilermen (B rating) — were the enlisted sailors responsible for operating and maintaining the main propulsion boilers that powered steam-driven Navy ships. Boiler Technicians worked in the fireroom or boiler room, directly managing the high-pressure water-tube boilers that generated steam for main propulsion turbines, ship’s service electrical generators, and auxiliary systems throughout the ship. Because naval boilers were covered with massive quantities of asbestos insulation — on the boiler casings, steam drums, superheaters, and economizers — and because every flanged boiler connection used asbestos gaskets and asbestos packing, the BT rating was among the most heavily asbestos-exposed occupations in the United States Navy. Publicly filed asbestos litigation records document Boiler Technicians with personal testimony about daily asbestos exposure in the fireroom, specific destroyer and ship assignments, raw asbestos handling records, and formal rating-specific epidemiological documentation.

Documented Asbestos Exposure — Boiler Technician Rating

Personal Testimony — BT Service and Asbestos Exposure

Specific Ship Assignments — Named Destroyers

Raw Asbestos Handling — Direct Exposure Documentation

Thermal Insulation — Boiler Room Asbestos Environment

Formal Rating Epidemiology

  • Direct physical contact with asbestos-covered boiler casings and steam drums
  • Replacement of asbestos valve and flange gaskets on steam systems
  • Replacement of asbestos packing on boiler safety valves and feedwater control valves
  • Exposure to asbestos dust generated by fireroom insulation deterioration during normal ship operations

How Boiler Technicians Were Exposed to Asbestos

Main propulsion boilers: Navy steam propulsion boilers — manufactured by Babcock & Wilcox, Combustion Engineering, and Foster Wheeler — were insulated with asbestos block and asbestos blanket throughout the boiler casing, steam drum, superheater sections, and economizer. BTs worked in immediate proximity to this insulation during every watch.

Gasket and packing replacement: Every flanged connection on the steam system — including boiler steam drum flanges, feedwater inlet connections, safety valve seats, and soot blower connections — used asbestos gaskets. BTs replaced these gaskets routinely during maintenance. Valve stems on all boiler control valves used asbestos packing rope, replaced by BTs during valve maintenance.

Steam line insulation: Steam supply lines from the boilers to the main propulsion turbines, ship’s service generators, and auxiliary steam systems throughout the ship were covered with asbestos pipe insulation. BTs worked around this insulation constantly in the fireroom and adjoining machinery spaces.

Boiler overhaul at shipyards: During ship overhaul at naval and private shipyards, all boiler insulation was removed and replaced by shipyard insulation workers working in the fireroom alongside BTs — generating the highest asbestos fiber concentrations in the shipboard environment.

Navy veterans who served as Boiler Technicians (BT) or Boilermen (B), whether aboard steam-powered destroyers, cruisers, carriers, or amphibious ships, who subsequently developed mesothelioma, asbestos-related lung cancer, asbestosis, or pleural disease may qualify for:

  • VA service connection under VA asbestos-claim guidance — the BT rating’s fireroom duties place BTs among the Navy’s highest-exposure ratings for the VA asbestos asbestos service connection claim
  • Civil claims against Navy boiler manufacturers (Babcock & Wilcox, Combustion Engineering, Foster Wheeler) and asbestos insulation product manufacturers for failure to warn about asbestos hazards in boiler equipment

Key documents for a BT asbestos claim:

  • DD-214 — documenting BT or B rating and ship assignments
  • Service records — documenting fireroom or boiler room duty stations aboard specific ships
  • Diagnosis — mesothelioma, asbestos-related lung cancer, asbestosis, or pleural disease

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Exposure documentation derived from publicly filed asbestos litigation records including personal Boiler Technician testimony describing daily asbestos exposure in the Navy fireroom, specific destroyer ship assignments, raw asbestos handling documentation, and formal Navy rating epidemiology identifying the BT rating as among the highest-exposure occupations in the United States Navy. This does not constitute legal or medical advice.