Negative Pressure Glove Bag Systems

Negative pressure glove bag systems may be used to remove asbestos containing material or presumed asbestos containing material from piping. In addition to specifications for glove bag systems above, negative pressure glove bag systems must attach HEPA vacuum systems or other devices to bag to prevent collapse during removal. The HEPA vacuum cleaner or other device used to prevent collapse of bag during removal must run continually during the operation until it is completed at which time the bag must be collapsed prior to removal of the bag from the pipe.

Where a separate waste bag is used along with a collection bag and discarded after one use, the collection bag may be reused if it's rinsed clean with amended water before reuse.

Negative pressure glove boxes may be used to remove ACM or PACM from pipe runs with the following specifications and work practices:

• Glove boxes must be constructed with rigid sides and made from metal or other material which can withstand the weight of the ACM and PACM and water used during removal.
• A negative pressure generator must be used to create negative pressure in the system.
• An air filtration unit must be attached to the box.
• The box must be fitted with gloved apertures.
• An aperture at the base of the box must serve as a bagging outlet for waste ACM and water.
• A back-up generator must be present on site.
• Waste bags must consist of 6 mil thick plastic double-bagged before they are filled or plastic thicker than 6 mil.
• At least two persons must perform the removal.
• The box must be smoke-tested for leaks and any leaks sealed prior to each use.
• Loose or damaged asbestos containing material adjacent to the box must be wrapped and sealed in two layers of 6 mil plastic prior to the job, or otherwise made intact prior to the job.
• A HEPA filtration system must be used to maintain pressure barrier in box.

To learn more about Construction Asbestos Safety visit our Construction Asbestos Safety Online Training web page.