Product Description
Babcock & Wilcox Company designed and manufactured stack economizer sections as an integral rear-pass component of virtually every utility, industrial, and marine watertube boiler it shipped. The economizer is a finned-tube bundle installed downstream of the superheater/reheater that preheats incoming feedwater using residual flue-gas heat before the gases reach the air preheater and stack. Because the economizer bank operates at high internal pressure and hot flue-gas exterior, its casing was traditionally lagged with troweled asbestos-cement to seal casing seams and insulate the outer skin.
Plaintiffs alleged in publicly filed U.S. asbestos personal-injury and wrongful-death litigation that Babcock & Wilcox economizer sections were originally shipped and site-completed with asbestos-containing casing, seal, and penetration components:
- Troweled asbestos-cement applied over the economizer outer casing plate and seam welds
- Asbestos-fabric header boot seals at the inlet/outlet header penetrations through the casing
- Asbestos-rope tube-penetration packing at each of hundreds of tube-to-casing pass-throughs
- Asbestos-block insulation on the exposed header cans and outlet ductwork
- Asbestos-cloth expansion-joint bellows covers at the economizer-to-air-preheater transition
Babcock & Wilcox has been named as a Manufacturer Defendant in publicly filed U.S. asbestos personal-injury and wrongful-death litigation.
Workers Exposed
- Insulators (HFIAW members) troweling, patching, and stripping asbestos-cement casing insulation
- Boilermakers cutting into the economizer casing for tube-plugging and re-tubing
- Pipefitters (UA members) replacing header-boot seals and tapping welded stub-ins
- Millwrights and maintenance mechanics during scheduled outage clean-outs
- Navy boiler technicians on shipboard economizer maintenance
Casing repairs typically involved chipping hardened asbestos-cement off casing plate with pneumatic needle-guns and hand chisels — an activity plaintiffs allege released respirable chrysotile fiber into the boiler back-pass work area.