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.