The Boiler Tender (BT) — also designated Boilerman in earlier rating tables — was the Navy enlisted rate most directly and continuously exposed to asbestos aboard pre-1980 steam-powered vessels. The BT rating owned the firerooms and auxiliary boiler spaces: the most heavily insulated, most confined, and most asbestos-saturated compartments on any steam-driven ship.
Deposition testimony from Navy Boiler Tenders in publicly filed asbestos litigation documents the specific work activities, the specific products, and the specific spaces that drove exposure for this rating.
The Fireroom Environment
Boiler Tenders stood watch and performed maintenance in the ship’s firerooms — compartments located below the waterline, typically two decks below the main deck on large carriers and one deck below on destroyers and smaller combatants. Every surface in a fireroom was insulated:
- Boiler casings — block insulation (Kaylo block, 85% magnesia, or amosite board) applied directly over the boiler shell; had to be removed for any boiler inspection and reinstalled afterward
- Steam lines — pipe covering (Kaylo, Thermobestos, or Armstrong) over every main and auxiliary steam line exiting the boiler
- Valves and flanges — compressed asbestos sheet gaskets at every flange joint; braided asbestos packing (Garlock, John Crane) in every valve stuffing box
- Uptakes and exhaust ducts — lined with asbestos-containing refractory and board insulation
- Overhead and bulkhead insulation — deteriorating over the ship’s service life, releasing airborne fibers into the enclosed space
Publicly filed testimony describes firerooms with approximately 40 Boiler Tenders assigned across watch sections aboard large carriers — all working and breathing in the same enclosed space during operations when steam demand kept insulation at elevated temperatures that accelerated fiber release.
Documented Work Activities
The Boilerman 3 & 2 training manual — preserved in the litigation corpus — describes the duties that created repeated daily asbestos exposure:
Boiler maintenance (highest-dust activity): Removing block insulation from boiler casings was the single highest-dust maintenance task in the fireroom. Testimony describes chipping and hammering aged insulation loose from boiler shells — the same activity documented in auxiliary boiler tenders aboard submarine tenders and destroyer tenders. The insulation was typically crumbling and fragile after years of heat cycling, releasing heavy visible dust during removal.
Valve and fitting work: Repacking valve stuffing boxes and replacing flange gaskets were routine BT tasks performed during scheduled maintenance and casualty response. Asbestos packing was pulled from valve glands with picks and scrapers; new packing was cut to length and installed. Gaskets were cut by hand from sheet stock using gasket punches and knives. Both activities released fibers in confined spaces.
Watch standing: Fireroom watch — standing at the boiler fronts monitoring gauges and adjusting firing rates — placed Boiler Tenders in continuous proximity to deteriorating insulation for the duration of each watch. “Minor work being performed” by insulation workers or other trades during watch created bystander exposure on top of ambient fiber from the overhead and bulkhead insulation.
Combined BT / Insulator role: Publicly filed litigation records describe some Navy Boiler Tenders serving simultaneously as “Boiler Tender and Insulator” — directly applying and removing asbestos pipe covering and block insulation as part of their duties, rather than relying on shipyard insulators.
Ships and Equipment
Boiler Tenders are documented in the litigation record aboard:
- Essex-class aircraft carriers (CV/CVA/CVS) — eight Babcock & Wilcox boilers per ship; fireroom crew of approximately 40 BTs
- Midway-class carriers (CVB/CVA) — twelve Babcock & Wilcox boilers
- Forrestal-class supercarriers (CVA) — eight Foster Wheeler and Babcock & Wilcox D-type 1,200-psi boilers
- Destroyer tenders (AD) and submarine tenders (AS) — auxiliary 150-psi “donkey boilers” (Babcock & Wilcox) in separate boiler spaces
- Destroyers (DD/DDG) and cruisers (CG/CA) — two to four boilers per hull
Equipment regularly maintained by Boiler Tenders with documented asbestos content:
| Equipment | Manufacturers | Asbestos source |
|---|---|---|
| Main boilers | Babcock & Wilcox, Foster Wheeler, Combustion Engineering | Casing block insulation, refractory, boiler plate gaskets |
| Auxiliary boilers | Babcock & Wilcox | Block insulation, door gaskets |
| Steam valves | Crane Co., Leslie Controls, Atwood & Morrill, Yarway | Stem packing, flange gaskets |
| Feed water pumps | Worthington, Warren, De Laval, Ingersoll-Rand | Packing glands, flange gaskets |
| Steam traps | Yarway, Armstrong | Internal gaskets |
| Pipe covering | Kaylo (Owens-Illinois), Armstrong, Thermobestos, Philip Carey | Cut-and-fitted asbestos insulation |
Documented Crew — Ratings and Exposure Periods
Publicly filed deposition testimony from Navy Boiler Tenders documents the following exposure patterns:
- Boiler Tender / Boilerman — served aboard aircraft carriers including Essex-class vessels; described fireroom conditions with deteriorating overhead and bulkhead insulation; documented valve packing and boiler lagging removal as routine duties
- Boiler Tender and Insulator — dual role documented in publicly filed litigation; directly handled asbestos pipe covering and block insulation as part of assigned duties
- Chief Boilerman — supervised enlisted BTs in fireroom operations and maintenance; present during all high-dust activities
VA and Legal Options
The Boiler Tender rating is among the most-documented in VA and civil asbestos litigation. VA adjudicators applying 38 CFR § 3.309(d) are familiar with the BT exposure pattern.
Key documents for a BT claim:
- DD-214 Block 11 — primary specialty showing BT or Boilerman rate
- Ship assignments from DD-214 or NARA muster rolls
- Diagnosis — mesothelioma, asbestos-related lung cancer, asbestosis, or pleural disease confirmed by physician
Civil claims run against the manufacturers of the boilers, valves, pumps, gaskets, and pipe covering in the engineering spaces — Babcock & Wilcox, Crane Co., John Crane, Garlock, Kaylo (Owens-Illinois), and others — most of whom have established asbestos bankruptcy trusts.
Free, confidential case evaluation: Speak with O’Brien Law Firm — (314) 936-2956
All consultations are free. No fee unless a financial recovery is made on your behalf.
Exposure documentation derived from publicly filed asbestos litigation records including deposition testimony, Navy training manuals (Boilerman 3 & 2), and Bureau of Ships technical correspondence. This does not constitute legal or medical advice.