25 October 2004
ASBESTOS DELAGGING FACILITIES
FUNCTION. An asbestos delagging facility provides a complete workshop
to remove asbestos insulation from piping and mechanical equipment during ship repair.
The ventilation system design discussed in this section is for activities with extensive
asbestos removal operations. The design includes: shop and equipment space, clean
and dirty locker rooms for men and women, and administrative space to support the
coordination and monitoring of facility operation.
. When asbestos insulation
is delagged, the
asbestos fibers are dispersed into the air, creating a health hazard. 29 CFR 1910.1001,
Asbestos, General Industry and 29 CFR 1915.1001, Asbestos, Shipyards dictate
protective measures for workers in these facilities, including respirator protection and
impermeable outerwear. The regulations also prescribe wetting the asbestos material
with amended water (water containing a surfactant), if practicable, to reduce the
potential for asbestos fibers to become airborne.
Heat Stress. The physical nature of the work and impermeable outer
garments worn by the workers creates heat stress conditions. Provide supplied air
respirators with vortex tubes as specified in EPA-560-OPTS-86-001, A Guide to
Respiratory Protection for the Asbestos Abatement Industry. Consider cooling the
replacement air when supplied air respirators are not available. Consider using "micro
climate cooling" or "cool suits," mechanically cooled garments, for individual workers.
Employee Workflow. Workers enter the clean locker rooms through the
administrative area. They put on protective outerwear and proceed to the shop area.
After performing delagging, workers vacuum their protective outerwear and dispose of
them in containers provided in the decontamination area. They enter the dirty locker
rooms and remove the remainder of their work garments. Workers then proceed to the
clean locker rooms via the showers, which act as a barrier to the migration of asbestos
TYPICAL FLOOR PLANS. Design floor plans to meet the requirements of
29 CFR 1910.1001 and 29 CFR 1915.1001 and paragraph 3-2.3. Figure 3-1 shows a
sample delagging facility floor plan.